Primary immunodeficiency diseases: an update on the classification from the international union of immunological societies expert committee for primary immunodeficiency.

We report the updated classification of primary immunodeficiencies (PIDs) compiled by the Expert Committee of the International Union of Immunological Societies. In comparison to the previous version, more than 30 new gene defects are reported in this updated version. In addition, we have added a table of acquired defects that are phenocopies of PIDs. For each disorder, the key clinical and laboratory features are provided. This classification is the most up-to-date catalog of all known PIDs and acts as a current reference of the knowledge of these conditions and is an important aid for the molecular diagnosis of patients with these rare diseases.

Background

The International Union of Immunological Societies (IUIS) Expert Committee on Primary Immunodeficiency met in New York on 19th–21st April 2013 to update the classification of human primary immunodeficiencies (PIDs). This report represents the most current and complete catalog of known PIDs. It serves as a reference for these conditions and provides a framework to help in the diagnostic approach to patients suspected to have PID.

As in previous reports, we have classified the conditions into major groups of PIDs and these are now represented in nine different tables. In each table, we list the condition, its genetic defect if known, and the major immunological and in some conditions the non-immunological abnormalities associated with the disease. The classification this year differs slightly from the previous edition in that Table 1 lists combined immunodeficiencies without non-immunologic phenotypes, whereas Table 2 refers to combined immunodeficiencies with syndromic features, as increasing numbers of these are being identified. The title and classification of Tables 3–8 present the same major PID groups as in the previous report.

Table 1

Combined immunodeficiencies.

Disease	Genetic defect/presumed pathogenesis	Inheritance	Circulating T cells	Circulating B cells	Serum Ig	Associated features	OMIM number
1. T−B+ severe combined immunodeficiency (SCID)
(a) γc deficiency	Mutation of IL-2RG	XL	Markedly decreased	Normal or increased	Decreased	Markedly decreased NK cells	300400
	Defect in γ chain of receptors for IL-2, -4, -7, -9, -15, -21
(b) JAK3 deficiency	Mutation of JAK3	AR	Markedly decreased	Normal or increased	Decreased	Markedly decreased NK cells	600173
	Defect in Janus-activating kinase 3
(c) IL7Rα deficiency	Mutation of IL7RA	AR	Markedly decreased	Normal or increased	Decreased	Normal NK cells	146661
	Defect in IL-7 receptor α chain
(d) CD45 deficiencya	Mutation of PTPRC	AR	Markedly decreased	Normal	Decreased	Normal γ/δ T cells	151460
	Defect in CD45
(e) CD3δ deficiency	Mutation of CD3D	AR	Markedly decreased	Normal	Decreased	Normal NK cells	186790
	Defect in CD3δ chain of T cell antigen receptor complex					No γ/δ T cells
(f) CD3ε deficiencya	Mutation of CD3E	AR	Markedly decreased	Normal	Decreased	Normal NK cells	186830
	Defect in CD3ε chain of T cell antigen receptor complex					No γ/δ T cells
(g) CD3ζ deficiencya	Mutation of CD3Z	AR	Markedly decreased	Normal	Decreased	Normal NK cells	186740
	Defect in CD3ζ chain of T cell antigen receptor complex					No γ/δ T cells
(h) Coronin-1A deficiencya	Mutation of CORO1A defective thymic egress of T cells and defective T cell locomotion	AR	Markedly decreased	Normal	Decreased	Detectable thymus EBV associated B cell lymphoproliferation	605000
2. T−B−SCID
(i) DNA recombination defects
(a) RAG 1 deficiency	Mutation of RAG1	AR	Markedly decreased	Markedly decreased	Decreased		601457
	Defective VDJ recombination; defect of recombinase activating gene (RAG) 1
(a) RAG 2 deficiency	Mutation of RAG2	AR	Markedly decreased	Markedly decreased	Decreased		601457
	Defective VDJ recombination; defect of recombinase activating gene (RAG) 2
(b) DCLRE1C (artemis) deficiency	Mutation of ARTEMIS	AR	Markedly decreased	Markedly decreased	Decreased	Radiation sensitivity	602450
	Defective VDJ recombination; defect in artemis DNA recombinase repair protein
(c) DNA PKcs deficiencya	Mutation of PRKDC- Defective VDJ recombination; defect in DNA PKcs	AR	Markedly decreased	Markedly decreased	Decreased	Radiation sensitivity, microcephaly, and developmental defects	600899
	Recombinase repair protein
(ii) Reticular dysgenesis, AK2 deficiency	Mutation of AK2	AR	Markedly decreased	Decreased or normal	Decreased	Granulocytopenia and deafness	103020
	Defective maturation of lymphoid and myeloid cells (stem cell defect)
	Defect in mitochondrial adenylate kinase 2
(iii) Adenosine deaminase (ADA) deficiency	Mutation of ADA absent ADA activity, elevated lymphotoxic metabolites (dATP, S-adenosyl homocysteine)	AR	Absent from birth (null mutations) or progressive decrease	Absent from birth of progressive decrease	Progressive decrease	Decreased NK cells, often with costochondral junction flaring, neurological features, hearing impairment, lung and liver manifestations; partial ADA deficiency may lead to delayed or milder presentation	102700
Combined immunodeficiencies generally less profound than severe combined immunodeficiency
3. CD40 ligand deficiency	Mutation of CD40LG defects in CD40 ligand (CD40L; also called TNFSF5 or CD154) cause defective isotype switching and impaired dendritic cell signaling	XL	Normal; may progressively decrease	sIgM+ and sIgD+ B cells present, other surface isotype positive B cells absent	IgM increased or normal, other isotypes decreased	Neutropenia, thrombocytopenia; hemolytic anemia, biliary tract and liver disease, opportunistic infections	300386
4. CD40 deficiencya	Mutation of CD40 (also called TNFRSF5) defects in CD40 cause defective isotype switching and impaired dendritic cell signaling	AR	Normal	IgM+ and IgD+ B cells present, other isotypes absent	IgM increased or normal, other isotypes decreased	Neutropenia, gastrointestinal and liver/biliary tract disease, opportunistic infections	109535
5. Purine nucleoside phosphorylase (PNP) deficiency	Mutation of PNP, absent PNP, and T cell and neurologic defects from elevated toxic metabolites, especially dGTP	AR	Progressive decrease	Normal	Normal or decreased	Autoimmune hemolytic anemia, neurological impairment	164050
6. CD3γ deficiencya	Mutation of CD3G defect in CD3 γ – component of the T cell antigen receptor complex	AR	Normal, but reduced TCR expression	Normal	Normal		186740
7. CD8 deficiencya	Mutation of CD8A, defects of CD8 α chain – important for maturation and function of CD8 T cells	AR	Absent CD8, normal CD4 cells	Normal	Normal		186910
8. ZAP70 deficiency	Mutation in ZAP70 intracellular signaling kinase, acts downstream of TCR	AR	Decreased CD8, normal CD4 cells	Normal	Normal	Autoimmunity in some cases	269840
9. MHC class I deficiency	Mutations in TAP1, TAP2, or TAPBP (tapasin) genes giving MHC class I deficiency	AR	Decreased CD8, normal CD4	Normal	Normal	Vasculitis; pyoderma gangrenosum	604571
10. MHC class II deficiency	Mutation in transcription factors for MHC class II proteins (CIITA, RFX5, RFXAP, RFXANK genes)	AR	Normal number, decreased CD4 cells	Normal	Normal or decreased	Failure to thrive, diarrhea, respiratory tract infections, liver/biliary tract disease	209920
11. ITK deficiencya	Mutations in ITK encoding IL-2-inducible T cell kinase required for TCR-mediated activation	AR	Progressive decrease	Normal	Normal or decreased	EBV-associated B cell lymphoproliferation, lymphoma	613011
						Normal or decreased IgG
12. SH2D1A deficiency (XLP1)	Mutations in SH2D1A encoding an adaptor protein regulating intracellular signals	XL	Normal or increased activated T cells	Reduced memory B cells	Partially defective NK cell and CTL cytotoxic activity	Clinical and immunologic features triggered by EBV infection: HLH, lymphoproliferation, aplastic anemia, lymphoma	308240
						Hypogammaglobulinemia
						Absent iNKT cells
13. Cartilage hair hypoplasia	Mutations in RMRP (RNase MRP RNA) involved in processing of mitochondrial RNA and cell cycle control	AR	Varies from severely decreased (SCID) to normal; impaired lymphocyte proliferation	Normal	Normal or reduced. antibodies variably decreased	Can present just as combined immunodeficiency without other features of short-limbed dwarfism	250250
						Also see Table 2
14. MAGT1 deficiencya	Mutations in MAGT1, impaired Mg++ flux leading to impaired TCR signaling	XL	Decreased CD4 cells reduced numbers of RTE, impaired T cell proliferation in response to CD3	Normal	Normal	EBV infection, lymphoma; viral infections, respiratory, and GI infections	300715
15. DOCK8 deficiency	Mutations in DOCK8 – regulator of intracellular actin reorganization	AR	Decreased impaired T lymphocyte proliferation	Decreased, low CD27+ memory B cells	Low IgM, increased IgE	Low NK cells with impaired function, hypereosinophilia, recurrent infections; severe atopy, extensive cutaneous viral and bacterial (staph.) infections, susceptibility to cancer	243700
16. RhoH deficiencya	Mutations in RHOH – an atypical Rho GTPase transducing signals downstream of various membrane receptors	AR	Normal	Normal	Normal	HPV infection, lymphoma, lung granulomas, molluscum contagiosum	602037
			Low naïve T cells and RTE, restricted T cell repertoire and impaired T cells proliferation in response to CD3 stimulation
17. MST1 deficiency	Mutations in STK4 – a serine/threonine kinase	AR	Decreased/increased proportion of terminal differentiated effector memory cells (TEMRA), low naïve T cells, restricted T cell repertoire in the TEMRA population, and impaired T cells proliferation	Decreased	High	Recurrent bacterial, viral, and candidal infections; intermittent neutropenia; EBV-driven lymphoproliferation; lymphoma; congenital heart disease, autoimmune cytopenias; HPV infection	614868
18. TCRα deficiencya	Mutations in TRAC – essential component of the T cell receptor	AR	Normal all CD3 T cells expressed TCRγδ (or may be better to say: TCRαβ T cell deficiency), impaired T cells proliferation	Normal	Normal	Recurrent viral, bacterial, and fungal infections, immune dysregulation autoimmunity, and diarrhea	615387
19. LCK deficiencya	Defects in LCK – a proximal tyrosine kinase that interacts with TCR	AR	Normal total numbers but CD4+ T cell lymphopenia, low Treg numbers, restricted T cell repertoire, and impaired TCR signaling	Normal	Normal IgG and IgA and increased IgM	Diarrhea, recurrent infections, immune dysregulation autoimmunity	153390
20. MALT1 deficiencya	Mutations in MALT1 – a caspase-like cysteine protease that is essential for nuclear factor kappa B activation	AR	Normal impaired T cells proliferation	Normal	Normal	Bacterial, fungal, and viral infections	604860
					Impaired antibody response
21. IL-21R deficiencya	Defects in IL-21R – together with common gamma chain binds IL-21	AR	Abnormal T cell cytokine production; abnormal T cell proliferation to specific stimuli	Normal	Normal but impaired specific responses	Susceptibility to cryptosporidium and pneumocystis and cholangitis	605383
22. UNC119 deficiencya	Defects in UNC119 – an activator of src tyrosine kinases	AD	Low T cells	Mostly low	Normal	Recurrent bacterial, fungal, and viral infections	604011
			CD4+ T cell lymphopenia, impaired TCR signaling
23. CARD11 deficiencya	Defects in CARD11 – acts as a scaffold for NF-κB activity in the adaptive immune response	AR	Normal predominance of naive T lymphocyte, impaired T cells proliferation	Normal predominance of transitional B lymphocytes	Absent/low	Pneumocystis jiroveci pneumonia, bacterial infections	615206
24. OX40 deficiencya	Defects in OX40 – a co-stimulatory molecule expressed on activated T cells	AR	Normal T cell numbers	Normal B cell numbers	Normal	Kaposi’s sarcoma; impaired immunity to HHV8	615593
			Low levels of antigen-specific memory CD4+ cells	Lower frequency of memory B cells
25. IKBKB deficiencya	Defects in IKBKB – encodes IkB kinase 2 a component of the NF-κB pathway	AR	Normal total T cells; absent regulatory and gd T cells; impaired TCR activation	Normal B cell numbers; impaired BCR activation	Decreased	Recurrent bacterial, viral, and fungal infections; clinical phenotype of SCID	615592
26. Activated PI3K-δ	Mutation in PIK3CD, PI3K-δ	AD gain-of-function	Decreased total numbers of T cells	Decreased total peripheral B cell and switched memory B cells; increased transitional B cells	Reduced IgG2 and impaired antibody to pneumococci and hemophilus	Respiratory infections, bronchiectasis; autoimmunity; chronic EBV, and CMV infection	602839
27. LRBA deficiency	Mutations in LRBA (lipopolysaccharide responsive beige-like anchor protein)	AR	Normal or decreased CD4 numbers; T cell dysregulation	Low or normal numbers of B cells	Reduced I IgG and IgA in most	Recurrent infections, inflammatory bowel disease, autoimmunity; EBV infections	606453
28. CD27 deficiencya	Mutations in CD27, encoding TNF-R member superfamily required for generation and long-term maintenance of T cell immunity	AR	Normal	No memory B cells	Hypogamma globulinemia following EBV infection	Clinical and immunologic features triggered by EBV infection, HLH	615122
						Aplastic anemia, lymphoma
						Hypogammaglobulinemia
						Low iNKT cells
29. Omenn syndrome	Hypomorphic mutations in RAG1, RAG2, artemis, IL7RA, RMRP, ADA, DNA ligase IV, IL-2RG, AK2, or associated with DiGeorge syndrome; some cases have no defined gene mutation		Present; restricted T cell repertoire, and impaired function	Normal or decreased	Decreased, except increased IgE	Erythroderma, eosinophilia, adenopathies, hepatosplenomegaly	603554

XL, X-linked inheritance; AR, autosomal recessive inheritance; AD, autosomal dominant inheritance; SCID, severe combined immune deficiencies; EBV, Epstein–Barr virus; Ca.

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Infants with SCID who have maternal T cells engraftment may have T cells that do not function normally; these cells may cause autoimmune cytopenias or graft versus host disease. Hypomorphic mutations in several of the genes that cause SCID may result in Omenn syndrome (OS), or “leaky” SCID or a less profound CID phenotype. Both OS and leaky SCID can be associated with higher numbers of T cells and reduced rather than absent activation responses when compared with typical SCID caused by null mutations. A spectrum of clinical findings including typical SCID, OS, leaky SCID, granulomas with T lymphopenia, autoimmunity, and CD4+ T lymphopenia can be found with RAG gene defects. RAC2 deficiency is a disorder of leukocyte motility and is reported in Table .

Table 2

Combined immunodeficiencies with associated or syndromic features.

Disease	Genetic defect/presumed pathogenesis	Inheritance	Circulating T cells	Circulating B cells	Serum Ig	Associated features	OMIM number
1. Congenital thrombocytopenia
(a) Wiskott– Aldrich syndrome (WAS)	Mutations in WAS; cytoskeletal, and immunologic synapse defect affecting hematopoietic stem cell derivatives	XL	Progressive decrease, abnormal lymphocyte responses to anti-CD3	Normal	Decreased IgM: antibody to polysaccharides particularly decreased; often increased IgA and IgE	Thrombocytopenia with small platelets; eczema; lymphoma; autoimmune disease; IgA nephropathy; bacterial and viral infections. XL thrombocytopenia is a mild form of WAS, and XL neutropenia is caused by missense mutations in the GTPase binding domain of WASP	301000
(b) WIP deficiencya	Mutations in WIPF1; cytoskeletal and immunologic synapse defect affecting hematopoietic stem cell derivatives	AR	Reduced, defective lymphocyte responses to anti-CD3	Low	Normal, except for increased IgE	Recurrent infections; eczema; thrombocytopenia. WAS-like phenotype	614493
2. DNA repair defects (other than those in Table 1)
(a) Ataxia–telangiectasia	Mutations in ATM; disorder of cell cycle checkpoint; and DNA double-strand break repair	AR	Progressive decrease	Normal	Often decreased IgA, IgE, and IgG subclasses; increased IgM monomers; antibodies variably decreased	Ataxia; telangiectasia; pulmonary infections; lymphoreticular and other malignancies; increased alpha fetoprotein and increased radiosensitivity; chromosomal instability	208900
(b) Ataxia–telangiectasia-like disease (ATLD)a	Hypomorphic mutations in MRE11; disorder of cell cycle checkpoint and DNA double-strand break repair	AR	Progressive decrease	Normal	Antibodies variably decreased	Moderate ataxia; pulmonary infections; severely increased radiosensitivity	604391
(c) Nijmegen breakage syndrome	Hypomorphic mutations in NBS1 (Nibrin); disorder of cell cycle checkpoint and DNA double-strand break repair	AR	Progressive decrease	Variably reduced	Often decreased IgA, IgE, and IgG subclasses; increased IgM; antibodies variably decreased	Microcephaly; bird-like face; lymphomas; solid tumors; increased radiosensitivity; chromosomal instability	251260
(d) Bloom syndrome	Mutations in BLM; RecQ-like helicase	AR	Normal	Normal	Reduced	Short stature; bird-like face; sun-sensitive erythema; marrow failure; leukemia; lymphoma; chromosomal instability	210900
(e) Immunodeficiency with centromeric instability and facial anomalies (ICF)	Mutations in DNA methyltransferase DNMT3B (ICF1) resulting in defective DNA methylation	AR	Decreased or normal; responses to PHA may be decreased	Decreased or normal	Hypogamma globulinemia; variable antibody deficiency	Facial dysmorphic features; macroglossia; bacterial/opportunistic infections; malabsorption; cytopenias; malignancies; multiradial configurations of chromosomes 1, 9, 16; no DNA breaks	242860
(f) Immunodeficiency with centromeric instability and facial anomalies (ICF)	Mutations in ZBTB24 (ICF2)	AR	Decreased or normal; responses to PHA may be decreased	Decreased or normal	Hypogamma globulinemia; variable antibody deficiency	Facial dysmorphic features; macroglossia; bacterial/opportunistic infections; malabsorption; cytopenias; malignancies; multiradial configurations of chromosomes 1, 9, 16	242860
(g) PMS2 deficiency	Mutations in PMS2, resulting in class switch recombination deficiency due to impaired mismatch repair	AR	Normal	Switched and non-switched B cells are reduced	Low IgG and IgA, elevated IgM, abnormal antibody responses	Recurrent infections; café-au-lait spots; lymphoma, colorectal carcinoma, brain tumor	600259
(h) RNF168 deficiencya	Mutations in RNF168, resulting in defective DNA double-strand break repair	AR	Normal	Normal	Low IgG or low IgA	Short stature; mild motor control to ataxia and normal intelligence to learning difficulties; mild facial dysmorphism to microcephaly; increased radiosensitivity	611943
(i) MCM4 deficiency	Mutations in MCM4 (minichromosome maintenance complex component 4) gene involved in DNA replication and repair	AR	Normal	Normal	Normal	Viral infections (EBV, HSV, VZV) Adrenal failure Short stature	609981
3. Thymic defects with additional congenital anomalies
(a) DiGeorge anomaly	Contiguous gene defect in 90% affecting thymic development; may also be due to heterozygous mutation in TBX1 (chromosome 22q11.2 deletion or TBX1 haploinsufficient syndrome)	De novo defect (majority) or AD	Decreased or normal; 5% have <1500 CD3 T cells/μL	Normal	Normal or decreased	Hypoparathyroidism, conotruncal malformation; abnormal facies; large deletion (3 Mb) in 22q11.2 (or rarely a deletion in 10p)	188400
(b) CHARGE syndrome	Variable defects of the thymus and associated T cell abnormalities often due to deletions or mutations in CHD7, SEMA3E, or as yet unknown genes	De novo defect (majority) or AD	Decreased or normal; some have <1500 CD3 T cells/μL	Normal	Normal or decreased	Coloboma, heart anomaly, choanal atresia, retardation, genital and ear anomalies	214800 608892
4. Immune-osseous dysplasias
(a) Cartilage hair hypoplasia	Mutations in RMRP (RNase MRP RNA) involved in processing of mitochondrial RNA and cell cycle control	AR	Varies from severely decreased (SCID) to normal; impaired lymphocyte proliferation	Normal	Normal or reduced. Antibodies variably decreased	Short-limbed dwarfism with metaphyseal dysostosis, sparse hair, bone marrow failure, autoimmunity, susceptibility to lymphoma and other cancers, impaired spermatogenesis, neuronal dysplasia of the intestine	250250
(b) Schimke syndrome	Mutations in SMARCAL1 involved in chromatin remodeling	AR	Decreased	Normal	Normal	Short stature, spondiloepiphyseal dysplasia, intrauterine growth retardation, nephropathy; bacterial, viral, and fungal infections; may present as SCID; bone marrow failure	242900
5. Hyper-IgE syndromes (HIES)
(a) AD-HIES (Job’s syndrome)	Dominant-negative heterozygous mutations in STAT3	AD Often de novo defect	Normal Th-17 and T follicular helper cells decreased	Normal Switched and non-switched memory B cells are reduced; BAFF level increased	Elevated IgE; specific antibody production decreased	Distinctive facial features (broad nasal bridge), eczema, osteoporosis, and fractures, scoliosis, delay of shedding primary teeth, hyperextensible joints, bacterial infections (skin and pulmonary abscesses, pneumatoceles) due to Staphylococcus aureus, candidiasis, aneurysm formation	147060
(i) Tyk2 deficiencya	Mutation in TYK2	AR	Normal, but multiple cytokine signaling defect	Normal	(±) Elevated IgE	Susceptibility to intracellular bacteria (Mycobacteria, Salmonella), fungi, and viruses	611521
(ii) DOCK8 deficiency	Mutations in DOCK8 – regulator of intracellular actin reorganization	AR	Decreased impaired T lymphocyte proliferation	Decreased, low CD27+ memory B cells	Low IgM, increased IgE	Low NK cells with impaired function, hypereosinophilia, recurrent infections; severe atopy, extensive cutaneous viral and bacterial (staph.) infections, susceptibility to cancer	243700
6. Dyskeratosis congenital (DKC)
(a) XL-DKC	Mutations in dyskerin (DKC1) (Hoyeraal–Hreidarsson syndrome)	XL	Progressive decrease	Progressive decrease	Variable	Intrauterine growth retardation, microcephaly, nail dystrophy, recurrent infections, digestive tract involvement, pancytopenia, reduced number and function of NK cells	305000
(b) AR-DKC due to NHP2 deficiency	Mutation in NOLA2 (NHP2)	AR	Decreased	Variable	Variable	Pancytopenia, sparse scalp hair and eyelashes, prominent periorbital telangiectasia, and hypoplastic/dysplastic nails	613987
(c) AR-DKC due to NOP10 deficiency	Mutation in NOLA3 (NOP10 PCFT)	AR	Decreased	Variable	Variable	Pancytopenia, sparse scalp hair and eyelashes, prominent periorbital telangiectasia, and hypoplastic/dysplastic nails	224230
(d) AR-DKC due to RTEL1 deficiency	Mutation in (RTEL1)	AR	Decreased	Variable	Variable	Pancytopenia, sparse scalp hair and eyelashes, prominent periorbital telangiectasia, and hypoplastic/dysplastic nails	608833
(e) AD-DKC due to TERC deficiency	Mutation in TERC	AD	Variable	Variable	Variable	Reticular hyperpigmentation of the skin, dystrophic nails, osteoporosis premalignant leukokeratosis of the mouth mucosa, palmar hyperkeratosis, anemia, pancytopenia	127550
(f) AD-DKC due to TERT deficiency	Mutation in TERT	AD	Variable	Variable	Variable	Reticular hyperpigmentation of the skin, dystrophic nails, osteoporosis premalignant leukokeratosis of the mouth mucosa, palmar hyperkeratosis, anemia, pancytopenia	614742
(g) AD-DKC due to TINF2 deficiency	Mutation in TINF2	AD	Variable	Variable	Variable	Reticular hyperpigmentation of the skin, dystrophic nails, osteoporosis premalignant leukokeratosis of the mouth mucosa, palmar hyperkeratosis, anemia, pancytopenia	613990
7. Defects of vitamin B12 and folate metabolism
(a) TCN2 deficiency	Mutation in TCN2; encodes transcobalamin, a transporter of cobalamin into blood cells	AR	Normal	Variable	Decreased	Megaloblastic anemia, pancytopenia, untreated for prolonged periods results in mental retardation	275350
(b) SLC46A1 deficiency	Mutation in SLC46A1; a proton coupled folate transporter	AR	Variable numbers and activation profile	Variable	Decreased	Megaloblastic anemia, failure to thrive untreated for prolonged periods results in mental retardation	229050
(c) MTHFD1a deficiency	Mutations in MTHFD1; essential for processing of single-carbon folate derivatives	AR	Low	Low	Decreased	Megaloblastic anemia, failure to thrive neutropenia, seizures, mental retardation
8. Comel–Netherton syndrome	Mutations in SPINK5 resulting in lack of the serine protease inhibitor LEKTI, expressed in epithelial cells	AR	Normal	Switched and non-switched B cells are reduced	Elevated IgE and IgA	Congenital ichthyosis, bamboo hair, atopic diathesis, increased bacterial infections, failure to thrive	256500
					Antibody variably decreased
9. Winged helix deficiency (Nude)a	Defects in forkhead box N1 transcription factor encoded by FOXN1	AR	Markedly decreased	Normal	Decreased	Alopecia, abnormal thymic epithelium, impaired T cell maturation	600838
10. ORAI-I deficiencya	Mutation in ORAI1, a Ca++ release-activated channel (CRAC) modulatory component	AR	Normal number, but defective TCR-mediated activation	Normal	Normal	Autoimmunity, anhydrotic ectodermic dysplasia, non-progressive myopathy defective TCR-mediated activation	610277
11. STIM1 deficiencya	Mutations in STIM1, a stromal interaction molecule 1	AR	Normal number, but defective TCR-mediated activation	Normal	Normal	Autoimmunity, anhydrotic ectodermal dysplasia, non-progressive myopathy defective TCR-mediated activation	605921
12. STAT5b deficiencya	Mutations in STAT5B, signal transducer, and transcription factor, essential for normal signaling from IL-2 and 15, key growth factors for T and NK cells	AR	Modestly decreased	Normal	Normal	Growth-hormone insensitive dwarfism	245590
						Dysmorphic features
						Eczema
						Lymphocytic interstitial pneumonitis, autoimmunity
13. Hepatic veno-occlusive disease with immunodeficiency (VODI)	Mutations in SP110	AR	Normal (decreased memory T cells)	Normal (decreased memory B cells)	Decreased IgG, IgA, IgM, absent germinal centers, absent tissue plasma cells	Hepatic veno-occlusive disease; Pneumocystis jiroveci pneumonia; susceptibility to CMV, Candida; thrombocytopenia; hepatosplenomegaly	235550
14. IKAROS deficiencya	Mutation in IKAROS	AD de novo	Normal, but impaired lymphocyte proliferation	Absent	Presumably decreased	Anemia, neutropenia, thrombocytopenia	Not assigned
15. FILS syndromea	Mutation in POLE1; defective DNA replication	AR	Low naïve T cells; decreased T cell proliferation	Low memory B cells	Decreased IgM and IgG; lack of antibodies to polysaccharide antigens	Mild facial dysmorphism (malar hypoplasia, high forehead), livedo, short stature; recurrent upper and lower respiratory tract infections, recurrent pulmonary infections, and recurrent meningitis	615139
16. Immunodeficiency with multiple intestinal atresias	Mutation in TTC7A [tetratricopeptide repeat (TPR) domain 7A] protein of unknown function	AR	Variable, but sometimes absent	Normal	Decreased	Multiple intestinal atresias, often with intrauterine polyhydramnios and early demise; some with SCID phenotype	243150

SCID, severe combined immune deficiencies; XL, X-linked inheritance; AR, autosomal recessive inheritance; AD, autosomal dominant inheritance; MSMD, Mendelian susceptibility of mycobacterial disease.

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T and B cell number and function in these disorders exhibit a wide range of abnormality; the most severely affected cases meet diagnostic criteria for SCID or leaky SCID and require immune system restoring therapy such as allogeneic hematopoietic cell transplantation. While not all DOCK8-deficient patients have elevated serum IgE, most have recurrent viral infections and malignancies as a result of combined immunodeficiency. AR-HIES due to Tyk2 deficiency is also listed in Table .

Table 3

Predominantly antibody deficiencies.

Disease	Genetic defect/presumed pathogenesis	Inheritance	Serum Ig	Associated features	OMIM number
1. Severe reduction in all serum immunoglobulin isotypes with profoundly decreased or absent B cells
(a) BTK deficiency	Mutations in BTK, a cytoplasmic tyrosine kinase activated by crosslinking of the BCR	XL	All isotypes decreased in majority of patients; some patients have detectable immunoglobulins	Severe bacterial infections; normal numbers of pro-B cells	300300
(b) μ Heavy chain deficiency	Mutations in μ heavy chain; essential component of the pre-BCR	AR	All isotypes decreased	Severe bacterial infections; normal numbers of pro-B cells	147020
(c) λ5 Deficiencya	Mutations in l5; part of the surrogate light chain in the pre-BCR	AR	All isotypes decreased	Severe bacterial infections; normal numbers of pro-B cells	146770
(d) Igα deficiencya	Mutations in Iga (CD79a); part of the pre-BCR and BCR	AR	All isotypes decreased	Severe bacterial infections; normal numbers of pro-B cells	112205
(e) Igβ deficiencya	Mutations in Igb (CD79β); part of the pre-BCR and BCR	AR	All isotypes decreased	Severe bacterial infections; normal numbers of pro-B cells	147245
(f) BLNK deficiencya	Mutations in BLNK; a scaffold protein that binds to BTK	AR	All isotypes decreased	Severe bacterial infections; normal numbers of pro-B cells	604615
(g) PI3 kinase deficiencya	Mutations in PIK3R1; a kinase involved in signal transduction in multiple cell types	AR	All isotypes decreased	Severe bacterial infections; decreased or absent pro-B cells	171833
(h) E47 transcription factor deficiencya	Mutations in TCF3; a transcription factor required for control of B cell development	AD	All isotypes decreased	Recurrent bacterial infections	147141
(i) Myelodysplasia with hypogammaglobulinemia	May have monosomy 7, trisomy 8, or dyskeratosis congenita	Variable	One or more isotypes may be decreased	Infections; decreased number of pro-B cells	Not assigned
(j) Thymoma with immunodeficiency	Unknown	None	One or more isotypes may be decreased	Bacterial and opportunistic infections; autoimmunity; decreased number of pro-B cells	Not assigned
2. Severe reduction in at least two serum immunoglobulin isotypes with normal or low number of B cells
(a) Common variable immunodeficiency disorders	Unknown	Variable	Low IgG and IgA and/or IgM	Clinical phenotypes vary: most have recurrent infections, some have polyclonal lymphoproliferation, autoimmune cytopenias, and/or granulomatous disease	Not assigned
(b) ICOS deficiencya	Mutations in ICOS; a co-stimulatory molecule expressed on T cells	AR	Low IgG and IgA and/or IgM	Recurrent infections; autoimmunity, gastroenteritis, granuloma in some	604558
(c) CD19 deficiencya	Mutations in CD19; transmembrane protein that amplifies signal through BCR	AR	Low IgG and IgA and/or IgM	Recurrent infections; may have glomerulonephritis	107265
(d) CD81 deficiencya	Mutations in CD81; transmembrane protein that amplifies signal through BCR	AR	Low IgG, low or normal IgA and IgM	Recurrent infections; may have glomerulonephritis	186845
(e) CD20 deficiencya	Mutations in CD20; a B cell surface receptor involved in B cell development and plasma cell differentiation	AR	Low IgG, normal or elevated IgM and IgA	Recurrent infections	112210
(f) CD21 deficiencya	Mutations in CD21; also known as complement receptor 2 and forms part of the CD19 complex	AR	Low IgG; impaired anti-pneumococcal response	Recurrent infections	614699
(g) TACI deficiency	Mutations in TNFRSF13B (TACI); a TNF receptor family member found on B cells and is a receptor for BAFF and APRIL	AD or AR or complex	Low IgG and IgA and/or IgM	Variable clinical expression	604907
(h) LRBA deficiency	Mutations in LRBA (lipopolysaccharide responsive beige-like anchor protein)	AR	Reduced I IgG and IgA in most	Recurrent infections, inflammatory bowel disease, autoimmunity; EBV infections	606453
(i) BAFF receptor deficiencya	Mutations in TNFRSF13C (BAFF-R); a TNF receptor family member found on B cells and is a receptor for BAFF	AR	Low IgG and IgM	Variable clinical expression	606269
(j) TWEAKa	Mutations in TWEAK	AD	Low IgM and IgA; lack of anti-pneumococcal antibody	Pneumonia, bacterial infections, warts; thrombocytopenia. neutropenia	602695
(k) NFKB2 deficiencya	Mutations in NFKB2; an essential component of the non-canonical NF-κB pathway	AD	Low IgG and IgA and IgM	Recurrent infections	615577
(l) Warts, hypogammaglobulinemia, infections, myelokathexis (WHIM) syndrome	Gain-of-function mutations of CXCR4, the receptor for CXCL12	AD	Panhypogammaglobulinemia, decreased B cells	Warts/human papilloma virus (HPV) infection Neutropenia Reduced B cell number Hypogammaglobulinemia	193670
3. Severe reduction in serum IgG and IgA with normal/elevated IgM and normal numbers of B cells
(a) CD40L deficiency	Mutations in CD40LG (also called TNFSF5 or CD154)	XL	IgG and IgA decreased; IgM may be normal or increased; B cell numbers may be normal or increased	Bacterial and opportunistic infections, neutropenia, autoimmune disease	300386
(b) CD40 deficiencya	Mutations in CD40 (also called TNFRSF5)	AR	Low IgG and IgA; normal or raised IgM	Bacterial and opportunistic infections, neutropenia, autoimmune disease	109535
(c) AID deficiency	Mutations in AICDA gene	AR	IgG and IgA decreased; IgM increased	Bacterial infections, enlarged lymph nodes, and germinal centers	605257
(d) UNG deficiency	Mutations in UNG	AR	IgG and IgA decreased; IgM increased	Enlarged lymph nodes and germinal centers	191525
4. Isotype or light chain deficiencies with generally normal numbers of B cells
(a) Ig heavy chain mutations and deletions	Mutation or chromosomal deletion at 14q32	AR	One or more IgG and/or IgA subclasses as well as IgE may be absent	May be asymptomatic	Not assigned
(b) κ Chain deficiencya	Mutations in Kappa constant gene	AR	All immunoglobulins have lambda light chain	Asymptomatic	147200
(c) Isolated IgG subclass deficiency	Unknown	Variable	Reduction in one or more IgG subclass	Usually asymptomatic; a minority may have poor antibody response to specific antigens and recurrent viral/bacterial infections	Not assigned
(d) IgA with IgG subclass deficiency	Unknown	Variable	Reduced IgA with decrease in one or more IgG subclass	Recurrent bacterial infections	Not assigned
(e) PRKC δ deficiencya	Mutation in PRKCD; encoding a member of the protein kinase C family critical for regulation of cell survival, proliferation, and apoptosis	AR	Low IgG levels; IgA and IgM above the normal range	Recurrent infections; EBV chronic infection Lymphoproliferation SLE-like autoimmunity (nephrotic and antiphospholipid syndromes)	615559
(f) Activated PI3K-δ	Mutation in PIK3CD, PI3K-δ	AD gain-of-function	Reduced IgG2 and impaired antibody to pneumococci and hemophilus	Respiratory infections, bronchiectasis; autoimmunity; chronic EBV, CMV infection	602839
(g) Selective IgA deficiency	Unknown	Variable	IgA decreased/absent	Usually asymptomatic; may have recurrent infections with poor antibody responses to carbohydrate antigens; may have allergies or autoimmune disease. A very few cases progress to CVID, others coexist with CVID in the family	137100
5. Specific antibody deficiency with normal Ig concen-trations and normal numbers of B cells	Unknown	Variable	Normal	Reduced ability to produce antibodies to specific antigens	Not assigned
6. Transient hypogammaglobulinemia of infancy with normal numbers of B cells	Unknown	Variable	IgG and IgA decreased	Normal ability to produce antibodies to vaccine antigens, usually not associated with significant infections	Not assigned

XL, X-linked inheritance; AR, autosomal recessive inheritance; AD, autosomal dominant inheritance; BTK, Bruton tyrosine kinase; BLNK, B cell linker protein; AID, activation-induced cytidine deaminase; UNG, uracil-DNA glycosylase; ICOS, inducible costimulator; Ig(κ), immunoglobulin or κ light chain type.

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Several autosomal recessive disorders that might previously have been called CVID have been added to Table .

Common variable immunodeficiency disorders (CVID) include several clinical and laboratory phenotypes that may be caused by distinct genetic and/or environmental factors. Some patients with CVID and no known genetic defect have markedly reduced numbers of B cells as well as hypogammaglobulinemia. Alterations in TNFRSF13B (TACI) and TNFRSF13C (BAFF-R) sequences may represent disease-modifying mutations rather than disease causing mutations. CD40L and CD40 deficiency are included in Table .

Table 8

Complement deficiencies.

Disease	Genetic defect; presumed pathogenesis	Inheritance	Functional defect	Associated features	OMIM number
1. C1q deficiency	Mutation in C1QA, C1QB, C1QC: classical complement pathway components	AR	Absent CH50 hemolytic activity, defective activation of the classical pathway	SLE, infections with encapsulated organisms	120550; 601269; 120575
			Diminished clearance of apoptotic cells
2. C1r deficiency	Mutation in C1R: classical complement pathway component	AR	Absent CH50 hemolytic activity, defective activation of the classical pathway	SLE, infections with encapsulated organisms	216950
3. C1s deficiency	Mutation in C1S: classical complement pathway component	AR	Absent CH50 hemolytic activity, defective activation of the classical pathway	SLE, infections with encapsulated organisms	120580
4. C4 deficiency	Mutation in C4A, C4B: classical complement pathway components	AR	Absent CH50 hemolytic activity, defective activation of the classical pathway, defective humoral immune response to carbohydrate antigens in some patients	SLE, infections with encapsulated organisms	120810; 120820
5. C2 deficiency	Mutation in C2: classical complement pathway component	AR	Absent CH50 hemolytic activity, defective activation of the classical pathway	SLE, infections with encapsulated organisms, atherosclerosis	217000
6. C3 deficiency	Mutation in C3: central complement component	AR, gain-of-function AD	Absent CH50 and AH50 hemolytic activity defective opsonization	Infections; glomerulonephritis	120700
			Defective humoral immune response	Atypical hemolytic–uremic syndrome with gain-of-function mutations
7. C5 deficiency	Mutation in C5: terminal complement component	AR	Absent CH50 and AH50 hemolytic activity; defective bactericidal activity	Neisserial infections	120900
8. C6 deficiency	Mutation in C6: terminal complement component	AR	Absent CH50 and AH50 hemolytic activity; defective bactericidal activity	Neisserial infections	217050
9. C7 deficiency	Mutation in C7: terminal complement component	AR	Absent CH50 and AH50 hemolytic activity; defective bactericidal activity	Neisserial infections	217070
10. C8 α–γ deficiency	Mutation in C8A, C8G: terminal complement components	AR	Absent CH50 and AH50 hemolytic activity; defective bactericidal activity	Neisserial infections	120950
11. C8b deficiency	Mutation in C8B: Terminal complement component	AR	Absent CH50 and AH50 hemolytic activity; defective bactericidal activity	Neisserial infections	120960
12. C9 deficiency	Mutation in C9: Terminal complement component	AR	Reduced CH50 and AP50 hemolytic activity; deficient bactericidal activity	Mild susceptibility to Neisserial infections	613825
13. C1 inhibitor deficiency	Mutation in SERPING1: regulation of kinins and complement activation	AD	Spontaneous activation of the complement pathway with consumption of C4/C2	Hereditary angioedema	138470
			Spontaneous activation of the contact system with generation of bradykinin from high molecular weight kininogen
14. Factor Ba	Mutation in CFB: activation of the alternative pathway	AD	Gain-of-function mutation with increased spontaneous AH50	aHUS	138470
15. Factor D deficiency	Mutation in CFD: regulation of the alternative complement pathway	AR	Absent AH50 hemolytic activity	Neisserial infections	134350
16. Properdin deficiency	Mutation in CFP: regulation of the alternative complement pathway	XL	Absent AH50 hemolytic activity	Neisserial infections	312060
17. Factor I deficiency	Mutation in CFI: regulation of the alternative complement pathway	AR	Spontaneous activation of the alternative complement pathway with consumption of C3	Infections, Neisserial infections, aHUS, preeclampsia, membranoproliferative glomerulonephritis (MPGN)	610984
18. Factor H deficiency	Mutation in CFH: regulation of the alternative complement pathway	AR	Spontaneous activation of the alternative complement pathway with consumption of C3	Infections, Neisserial infections, aHUS, preeclampsia, membranoproliferative glomerulonephritis (MPGN)	609814
19. Factor H-related protein deficiencies	Mutation in CFHR1-5: bind C3b	AR	Normal CH50, AH50, autoantibodies to Factor H	aHUS	235400
20. Thrombomodulina	Mutation in THBD: regulates complement and coagulant activation	AD	Normal CH50, AH50	aHUS	188040
21. MASP1 deficiency	Mutation in MASP1: cleaves C2 and activates MASP2	AR	Deficient activation of the lectin activation pathway, cell migration	Infections, 3MC syndrome	600521
22. MASP2 deficiencya	MASP2: cleavage of C2 and C4	AR	Deficient activation of the lectin activation pathway	Pyogenic infections; inflammatory lung disease, autoimmunity	605102
23. 3MC syndrome COLEC11 deficiencya	Mutation in COLEC11: binds MASP1, MASP3	AR	Loss of neural crest cell migration signals	A developmental syndrome of facial dysmorphism, cleft lip and/or palate, craniosynostosis, learning disability, and genital, limb, and vesicorenal anomalies (3MC syndrome)	612502
24. Complement receptor 2 (CR2) deficiencya	Mutation in CD21	AR	See CD21 deficiency in Table 3		120650
25. Complement receptor 3 (CR3) deficiency	Mutation in ITGB2	AR	See LAD1 in Table 5		116920
Membrane cofactor protein (CD46) deficiency	Mutation in CD46: dissociates C3b and C4b	AD	Inhibitor of complement alternate pathway, decreased C3b binding	aHUS, infections, preeclampsia	120920
Membrane Attack Complex inhibitor (CD59) deficiencya	Mutation in CD59: regulates the membrane attack complex formation	AR	Erythrocytes highly susceptible to complement-mediated lysis	Hemolytic anemia, polyneuropathy	107271
Ficolin 3 deficiencya	Mutation in FCN3: activates the classical complement pathway	AR	Absence of complement activation by the Ficolin 3 pathway	Respiratory infections, abscesses	604973

XL, X-linked inheritance; AR, autosomal recessive inheritance; AD, autosomal dominant inheritance; MAC, membrane attack complex; SLE, systemic lupus erythematosus; MBP, mannose-binding protein; MASP2, MBP-associated serine protease 2.

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New entities added to Table .

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In this updated version, we have added a new category in Table 9 in which “Phenocopies of PID” are listed. This has resulted from our understanding and study of conditions that present as inherited immunodeficiencies, but which are not due to germline mutations and instead arise from acquired mechanisms. Examples include somatic mutations in specific immune cell populations that give rise to the phenotype of autoimmune lymphoproliferative syndrome (ALPS), and also autoantibodies against specific cytokines or immunological factors, with depletion of these factors leading to immunodeficiency. It is likely that increasing numbers of PID phenocopies will be identified in the future, and this may be the start of a much longer table.

Table 9

Phenocopies of PID.

Disease	Genetic defect/presumed pathogenesis	Circulating T cells	Circulating B cells	Serum Ig	Associated features/similar PID
Associated with somatic mutations
(a) Autoimmune lymphoproliferative syndrome (ALPS–SFAS)	Somatic mutation in TNFRSF6	Increased CD4−CD8−double negative (DN) T alpha/beta cells	Normal, but increased number of CD5+ B cells	Normal or increased	Splenomegaly, lymphadenopathy, autoimmune cytopenias
					Defective lymphocyte apoptosis/ALPS–FAS (=ALPS type Im)
(b) RAS-associated autoimmune leukoproliferative disease (RALD)	Somatic mutation in KRAS (gain-of-function)	Normal	B cell lymphocytosis	Normal or increased	Splenomegaly, lymphadenopathy, autoimmune cytopenias, granulocytosis, monocytosis/ALPS-like
(c) RAS-associated autoimmune leukoproliferative disease (RALD)	Somatic mutation in NRAS (gain-of-function)	Increased CD4−CD8−double negative (DN) T alpha/beta cells	Lymphocytosis		Splenomegaly, lymphadenopathy, autoantibodies/ALPS-like
Associated with autoantibodies
(a) Chronic mucocutaneous candidiasis (isolated or with APECED syndrome)	Germline mutation in AIREAutoAb to IL-17 and/or IL-22	Normal	Normal	Normal	Endocrinopathy, chronic mucocutaneous candidiasis/CMC
(b) Adult-onset immunodeficiency	AutoAb to IFN gamma	Decreased naive T cells	Normal	Normal	Mycobacterial, fungal, Salmonella VZV infections/MSMD, or CID
(c) Recurrent skin infection	AutoAb to IL-6	Normal	Normal	Normal	Staphylococcal infections/STAT3 deficiency
(d) Pulmonary alveolar proteinosis	AutoAb to GM-CSF	Normal	Normal	Normal	Pulmonary alveolar proteinosis, cryptococcal meningitis/CSF2RA deficiency
(e) Acquired angioedema	AutoAb to CI inhibitor	Normal	Normal	Normal	Angioedema/C1 INH deficiency (hereditary angioedema)

As with all complex diseases, any classification cannot be strictly adhered to. Certain conditions fall into more than one category and so appear in more than one table. For example, CD40L ligand deficiency is reported in both Tables 1 and 3 as it was initially identified as a defect of B cell isotype switching but is now known to be a defect of co-stimulatory T cell help and function. Similarly, XLP1 due to defects in SH2D1A is listed in Table 1 – combined immunodeficiencies, due to defects of T cell cytotoxicity, T cell help, and B cell maturation, but also in Table 4 – diseases of immune dysregulation, due to the susceptibility to hemophagocytosis. There is a growing appreciation that there can be wide phenotypic viability within a specific genotype that is a product of varied specific mutations between different patients as well as other host and/or environmental factors. The complexities of these conditions in terms of clinical and immunological presentation and heterogeneity cannot be easily captured in the limited space of a table format. For this reason, the furthest left column contains the Online Mendelian Inheritance in Man (OMIM) reference for each condition to allow access to greater detail and updated information.

Table 4

Diseases of immune dysregulation.

Disease	Genetic defect/presumed pathogenesis	Inheritance	Circulating T cells	Circulating B cells	Functional defect	Associated features	OMIM number
1. Familial hemophagocytic lymphohistiocytosis (FHL) syndromes
1.1 FHL syndromes without hypopigmentation
(a) Perforin deficiency (FHL2)	Mutations in PRF1; perforin is a major cytolytic protein	AR	Increased activated T cells	Normal	Decreased to absent NK and CTL activities (cytotoxicity)	Fever, hepatosplenomegaly (HSMG), hemophagocytic lymphohistiocytosis (HLH), cytopenias	603553
(b) UNC13D/Munc13-4 deficiency (FHL3)	Mutations in UNC13D a; required to prime vesicles for fusion	AR	Increased activated T cells	Normal	Decreased to absent NK and CTL activities (cytotoxicity and/or degranulation)	Fever, HSMG, HLH, cytopenias	608898
(c) Syntaxin 11 deficiency (FHL4)	Mutations in STX11, required for secretory vesicle fusion with the cell membrane	AR	Increased activated T cells	Normal	Decreased NK activity (cytotoxicity and/or degranulation)	Fever, HSMG, HLH, cytopenias	603552
(d) STXBP2/Munc18-2 deficiency (FHL5)	Mutations in STXBP2, required for secretory vesicle fusion with the cell membrane	AR	Increased activated T cells	Normal	Decreased NK and CTL activities (cytotoxicity and/or degranulation)	Fever, HSMG, HLH, cytopenias	613101
1.2. FHL syndromes with hypopigmentation
(a) Chediak–Higashi syndrome	Mutations in LYST Impaired lysosomal trafficking	AR	Increased activated T cells	Normal	Decreased NK and CTL activities (cytotoxicity and/or degranulation)	Partial albinismRecurrent infections, feverHSMG, HLHGiant lysosomes, neutropenia, cytopeniasBleeding tendencyProgressive neurological dysfunction	214500
(b) Griscelli syndrome, type 2	Mutations in RAB27A encoding a GTPase that promotes docking of secretory vesicles to the cell membrane	AR	Normal	Normal	Decreased NK and CTL activities (cytotoxicity and/or degranulation)	Partial albinism, fever, HSMG, HLH, cytopenias	607624
(c) Hermansky–Pudlak syndrome, type 2	Mutations in AP3B1 gene, encoding for the b subunit of the AP-3 complex	AR	Normal	Normal	Decreased NK and CTL activities (cytotoxicity and/or degranulation)	Partial albinismRecurrent infectionsPulmonary fibrosisIncreased bleedingNeutropeniaHLH	608233
2. Lymphoproliferative syndromes
(a) SH2D1A deficiency (XLP1)	Mutations in SH2D1A encoding an adaptor protein regulating intracellular signaling	XL	Normal or increased activated T cells	Reduced memory B cells	Partially defective NK cell and CTL cytotoxic activity	Clinical and immunological features triggered by EBV infection: HLHLymphoproliferation, aplastic anemia, lymphomaHypogammaglobulinemiaAbsent iNKT cells	308240
(b) XIAP deficiency (XLP2)	Mutations in XIAP/BIRC4 encoding an inhibitor of apoptosis	XL	Normal or increased activated T cells; low/normal iNK T cells	Normal or reduced memory B cells	Increased T cells susceptibility to apoptosis to CD95 and enhanced activation-induced cell death (AICD)	EBV infection, splenomegaly, lymphoproliferation HLH, colitis, IBD, hepatitis Low iNKT cells	300635
(c) ITK deficiencya	Mutations in ITK encoding IL-2 inducible T cell kinase required for TCR-mediated activation	AR	Progressive decrease	Normal	Decreased T cell activations	EBV-associated B cell lymphoproliferation, lymphomaNormal or decreased IgG	613011
(d) CD27 deficiencya	Mutations in CD27, encoding TNF-R member superfamily required for generation and long-term maintenance of T cell immunity	AR	Normal	No memory B cells	Low T and NK cells functions	Clinical and immunological features triggered by EBV infection: HLHAplastic anemia, lymphoma, hypogammaglobulinemiaLow iNKT cells	615122
3. Genetic defects of regulatory T cells
(a) IPEX, immune dysregulation, polyendocrinopathy, enteropathy X-linked	Mutations in FOXP3, encoding a T cell transcription factor	XL	Normal	Normal	Lack of (and/or impaired function of) CD4+ CD25+ FOXP3+ regulatory T cells (Tregs)	Autoimmune enteropathyEarly-onset diabetesThyroiditis, hemolytic anemia, thrombocytopenia, eczemaElevated IgE, IgA	304790
(b) CD25 deficiencya	Mutations in IL-2RA, encoding IL-2Rα chain	AR	Normal to decreased	Normal	No CD4+ C25+ cells with impaired function of Tregs cells	Lymphoproliferation, autoimmunity. Impaired T cell proliferation	606367
(c) STAT5b deficiencya	Mutations in STAT5B, signal transducer, and transcription factor, essential for normal signaling from IL-2 and 15, key growth factors for T and NK cells	AR	Modestly decreased	Normal	Impaired development and function of γδT cells, Tregs, and NK cells Low T cell proliferation	Growth-hormone insensitive dwarfism	245590
						Dysmorphic features
						Eczema
						Lymphocytic interstitial pneumonitis, autoimmunity
4. Autoimmunity without lymphoproliferation
(a) APECED (APS-1), autoimmune polyendocrinopathy with candidiasis and ectodermal dystrophy	Mutations in AIRE, encoding a transcription regulator needed to establish thymic self-tolerance	AR	Normal	Normal	AIRE-1 serves as checkpoint in the thymus for negative selection of autoreactive T cells and for generation of Tregs	Autoimmunity: hypoparathyroidism hypothyroidism, adrenal insufficiency, diabetes, gonadal dysfunction, and other endocrine abnormalities	240300
						Chronic mucocutaneous candidiasis
						Dental enamel hypoplasia
						Alopecia areata
						Enteropathy, pernicious anemia
(b) ITCH deficiencya	Mutations in ITCH, an E3 ubiquitin ligase catalyzes the transfer of ubiquitin to a signaling protein in the cell including phospholipase Cγ1 (PLCγ1)	AR	Not assessed	Not assessed	Itch deficiency may cause immune dysregulation by affecting both anergy induction in autoreactive effector T cells and generation of Tregs	Early-onset chronic lung disease (interstitial pneumonitis)	613385
						Autoimmune disorder (thyroiditis, type I diabetes, chronic diarrhea/enteropathy, and hepatitis)
						Failure to thrive, developmental delay, dysmorphic facial features
5. Autoimmune lymphoproliferative syndrome (ALPS)
(a) ALPS–FAS	Germinal mutations in TNFRSF6, encoding CD95/Fas cell surface apoptosis receptorb	AD	Increased CD4−CD8− TCRα/β double negative (DN) T cells	Normal, low memory B cells	Apoptosis defect FAS mediated	Splenomegaly, adenopathies, autoimmune cytopenias	601859
		ARc				Increased lymphoma risk
						IgG and A normal or increased
						Elevated FasL and IL-10, vitamin B12
(b) ALPS– FASLG	Mutations in TNFSF6, Fas ligand for CD95 apoptosis	AR	Increased DN T cells	Normal	Apoptosis defect FAS mediated	Splenomegaly, adenopathies, autoimmune cytopenias, SLE	134638
						Soluble FasL is not elevated
(c) ALPS–caspase 10a	Mutations in CASP10, intracellular apoptosis pathway	AD	Increased DN T cells	Normal	Defective lymphocyte apoptosis	Adenopathies, splenomegaly, autoimmunity	603909
(d) ALPS–caspase 8a	Mutations in CASP8, intracellular apoptosis, and activation pathways	AR	Slightly increased DN T cells	Normal	Defective lymphocyte apoptosis and activation	Adenopathies, splenomegaly, bacterial and viral infections, hypogammaglobulinemia	607271
(e) FADD deficiencya	Mutations in FADD encoding an adaptor molecule interacting with FAS, and promoting apoptosis	AR	Increased DN T cells	Normal	Defective lymphocyte apoptosis	Functional hyposplenism, bacterial and viral infections	613759
						Recurrent episodes of encephalopathy and liver dysfunction
(f) CARD11 gain-of-function (GOF) mutationsa	GOF mutations in CARD11, encoding a protein required for antigen receptor–induced NF-κB activation in B and T lymphocytes	AD	Normal	Increased M+D+CD19+ CD20+ B cells	Constitutive activation of NF-κB in B & T	Lymphoproliferation	606445
						Bacterial and viral infections
						EBV chronic infection
						Autoimmune cytopenia
						Hypogammaglobulinemia
(g) PRKCδ deficiencya	Mutations in PRKCD, encoding a member of the protein kinase C family critical for regulation of cell survival, proliferation, and apoptosis	AR	Normal	Low memory B cells and elevation of CD5 B cells	Apoptotic defect in B cells	Recurrent infections; EBV chronic infection	615559
						Lymphoproliferation
						SLE-like autoimmunity (nephrotic and antiphospholipid syndromes)
						HypoIgG
6. Immune dysregulation with colitis
(a) IL-10 deficiencya	Mutations in IL-10, encoding IL-10	AR	Normal	Normal	No functional IL-10 secretion	Inflammatory bowel disease (IBD) folliculitis	Not assigned
						Recurrent respiratory diseases
						Arthritis
(b) IL-10Rα deficiency	Mutations in IL-10RA, encoding IL-10R1	AR	Normal	Normal	Leukocytes, no response to IL-10	IBD, folliculitis	613148
						Recurrent respiratory diseases
						Arthritis, lymphoma
(c) IL-10Rβ deficiency	Mutations in IL-10RB, encoding IL-10R2	AR	Normal	Normal	Leukocytes, no response to IL-10, IL-22, IL-26, IL-28A, IL-28B, and IL-29	IBD, folliculitis	612567
						Recurrent respiratory diseases
						Arthritis, lymphoma
7. Type 1 interferonopathies
(a) TREX1 deficiency, Aicardi–Goutieres syndrome 1 (AGS1)	Mutations in TREX1, encoding nuclease involves in clearing cellular nucleic debris	AR	Not assessed	Not assessed	Intracellular accumulation of abnormal single-stranded (ss) DNA species leading to increased CSF alpha-IFN production	Progressive encephalopathy intracranial calcifications	606609
		ADe				Cerebral atrophy, leukodystrophy
						HSMG, thrombocytopenia
						Elevated hepatic transaminases
						Chronic cerebrospinal fluid (CSF) lymphocytosis
(b) RNASEH2B deficiency, AGS2	Mutations in RNASEH2B, encoding nuclease subunit involves in clearing cellular nucleic debris	AR	Not assessed	Not assessed	Intracellular accumulation of abnormal ss-DNA species leading to increased CSF alpha-IFN production	Progressive encephalopathy intracranial calcifications	610326
						Cerebral atrophy, leukodystrophy
						HSMG, thrombocytopenia
						Elevated hepatic transaminases
						Chronic CSF lymphocytosis
(c) RNASEH2C deficiency, AGS3	Mutations in RNASEH2C, encoding nuclease subunit involves in clearing cellular nucleic debris	AR	Not assessed	Not assessed	Intracellular accumulation of abnormal ss-DNA species leading to increased CSF alpha-IFN production	Progressive encephalopathy intracranial calcifications	610330
						Cerebral atrophy, leukodystrophy
						HSMG, thrombocytopenia
						Elevated hepatic transaminases
						Chronic CSF lymphocytosis
(d) RNASEH2A deficiency, AGS4a	Mutations in RNASEH2A, encoding nuclease subunit involves in clearing cellular nucleic debris	AR	Not assessed	Not assessed	Intracellular accumulation of abnormal ss-DNA species leading to increased CSF alpha-IFN production	Progressive encephalopathy intracranial calcifications	606034
						Cerebral atrophy, leukodystrophy
						HSMG, thrombocytopenia
						Elevated hepatic transaminases
						Chronic CSF lymphocytosis
(e) SAMHD1 deficiency, AGS5	Mutations in SAMHD1, encoding negative regulator of the immunostimulatory DNA response	AR	Not assessed	Not assessed	Induction of the cell intrinsic antiviral response, apoptosis, and mitochondrial DNA destruction leading to increased CSF alpha-IFN production	Progressive encephalopathy intracranial calcifications	612952
						Cerebral atrophy, leukodystrophy
						HSMG, thrombocytopenia, anemia elevated lactates
						Chronic CSF lymphocytosis
						Skin vasculitis, mouth ulcers, arthropathy
(f) ADAR1 deficiency, AGS6	Mutations in ADAR1, encoding an RNA-specific adenosine deaminase	AR	Not assessed	Not assessed	Catalyzes the deamination of adenosine to inosine in dsRNA substrates markedly elevated CSF IFN-alpha	Progressive encephalopathy intracranial calcification Severe developmental delay, leukodystrophy	615010
(g) Spondyloenchondro-dysplasia with immune dysregulation (SPENCD)	Mutations in ACP5, encoding tartrate-resistant acid phosphatase (TRAP)	AR	Not assessed	Not assessed	Upregulation of IFN-alpha and type I IFN-stimulated genes	Recurrent bacterial and viral infections, intracranial calcification	607944
						SLE-like autoimmunity (Sjögren’s syndrome, hypothyroidism, inflammatory myositis, Raynaud’s disease and vitiligo), hemolytic anemia, thrombocytopenia, skeletal dysplasia, short stature

XL, X-linked inheritance; AR, autosomal recessive inheritance; AD, autosomal dominant inheritance; FHL, familial hemophagocytic lymphohistiocytosis; HLH, hemophagocytic lymphohistiocytosis; HSMG, hepatosplenomegaly; DN, double negative; SLE, systemic lupus erythematous; IBD, inflammatory bowel disease; CSF, chronic cerebrospinal fluid.

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Fourteen new disorders have been added to Table .

The rapid advances in gene identification technology, including the widespread use of whole exome and whole genome sequencing, has meant that the ability to identify gene defects in affected families and even single individuals with inherited diseases has grown enormously. In this report, over 30 new gene defects have been added that were identified since the previous classification in November, 2011. These defects can be found in all major groups of PIDs included in this report. In many cases, the mutations are not necessarily in genes formally implicated in immune cell function but are genes involved in essential cell processes. The more detailed analysis and functional consequences of such defects as illustrated by these PIDs will increase our understanding of the interplay between different cellular processes in the development and function of the immune system.

Among the newly identified, gene defects are many that are to date particular to a single pedigree or individual; such defects may prove exceedingly rare, or indeed may not necessarily be found to recur in other individuals. We have marked conditions for which there are 10 or fewer reported individuals with an asterisk, although historically, following the description of the first few cases, additional individuals with a similar PID phenotype and genotype have often been recognized. It is likely that we will uncover many more “personal” or very rare gene defects over time and that the spectrum of PIDs will become increasingly diverse and complex, due to contributions of both environmental exposures and genetic modifiers to each affected individual. The value of this report therefore to capture and catalog the full spectrum at any one time point becomes increasingly important.

The goal of the IUIS Expert Committee on PIDs is to increase awareness, facilitate recognition, and promote optimal treatment for patients with PIDs. In addition to the current report and previous “classification table” publications, the committee has also produced a “Phenotypic Approach for IUIS PID Classification and Diagnosis: Guidelines for Clinicians at the Bedside,” which aims to lead physicians to particular groups of PIDs starting from clinical features and combining routine immunological investigations. Together, these contributions will hopefully allow a practical clinical framework for PID diagnosis. The committee also aims to establish a classification of PIDs based on other aspects and will work on publishing further guidelines in due course.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Table 5

Congenital defects of phagocyte number, function, or both.

Disease	Genetic defect/presumed pathogenesis	Inheritance	Affected cells	Affected function	Associated features	OMIM number
1. Defects of neutrophil function
(a) Severe congenital neutropenia 1 (ELANE deficiency)	Mutation in ELANE: misfolded protein response, increased apoptosis	AD	N	Myeloid differentiation	Susceptibility to MDS/leukemia	202700
(b) SCN2a (GFI 1 deficiency)	Mutation in GFI1: loss of repression of ELANE	AD	N	Myeloid differentiation	B/T lymphopenia	613107
(c) SCN3 (Kostmann disease)	Mutation in HAX1: control of apoptosis	AR	N	Myeloid differentiation	Cognitive and neurological defects in patients with defects in both HAX1 isoforms, susceptibility to MDS/leukemia	610738
(d) SCN4 (G6PC3 deficiency)	Mutation in G6PC3: abolished enzymatic activity of glucose-6-phosphatase, aberrant glycosylation, and enhanced apoptosis of N and F	AR	N + F	Myeloid differentiation, chemotaxis, O2−production	Structural heart defects, urogenital abnormalities, inner ear deafness, and venous angiectasias of trunks and limbs	612541
(e) SCN5	Mutation in VPS45 controls vesicular trafficking	AR	N + F	Myeloid differentiation, migration	Extramedullary hematopoiesis, bone marrow fibrosis, nephromegaly	615285
(f) Glycogen storage disease type 1b	Mutation in G6PT1: glucose-6-phosphate transporter 1	AR	N + M	Myeloid differentiation, chemotaxis, O2−production	Fasting hypoglycemia, lactic acidosis, hyperlipidemia, hepatomegaly	232220
(g) Cyclic neutropenia	Mutation in ELANE: misfolded protein response	AD	N	Differentiation	Oscillations of other leukocytes and platelets	162800
(h) X-linked neutropenia/amyelodysplasia	Mutation in WAS: regulator of actin cytoskeleton (loss of auto-inhibition)	XL, gain-of-function	N + M	Mitosis	Monocytopenia	300299
(i) P14/LAMTOR2 deficiencya	Mutation in ROBLD3/LAMTOR2: endosomal adaptor protein 14	AR	N + L Mel	Endosome biogenesis	Neutropenia	610389
					Hypogammaglobulinemia
					↓CD8 cytotoxicity
					Partial albinism
					Growth failure
(j) Barth syndrome	Mutation in tafazzin (TAZ) gene: abnormal lipid structure of mitochondrial membrane, defective carnitine metabolism	XL	N	Myeloid differentiation	Cardiomyopathy, myopathy, growth retardation	302060
(k) Cohen syndrome	Mutation in COH1 gene: Pg unknown	AR	N	Myeloid differentiation	Retinopathy, developmental delay, facial dysmorphisms	216550
(l) Clericuzio syndrome poikiloderma with neutropenia	Mutation in C16ORF57, affects genomic integrity	AR	N	Myeloid differentiation	Poikiloderma, neutropenia, MDS	613276
2. Defects of motility
(a) Leukocyte adhesion deficiency type 1 (LAD1)	Mutation in ITGB2: adhesion protein (CD18)	AR	N + M + L + NK	Adherence, chemotaxis, endocytosis, T/NK cytotoxicity	Delayed cord separation, skin ulcers Periodontitis Leukocytosis	116920
(b) Leukocyte adhesion deficiency type 2 (LAD2)a	Mutation in FUCT1: GDP-fucose transporter	AR	N + M	Rolling, chemotaxis	Mild LAD type 1 features plus hh-blood group plus mental and growth retardation	266265
(c) Leukocyte adhesion deficiency type 3 (LAD3)	Mutation in KINDLIN3: Rap1-activation of β1–3 integrins	AR	N + M + L + NK	Adherence, chemotaxis	LAD type 1 plus bleeding tendency	612840
(d) Rac 2 deficiencya	Mutation in RAC2: regulation of actin cytoskeleton	AD	N	Adherence, chemotaxis, O2−production	Poor wound healing, leukocytosis	602049
(e) β-Actin deficiencya	Mutation in ACTB: cytoplasmic actin	AD	N + M	Motility	Mental retardation, short stature	102630
(f) Localized juvenile periodontitis	Mutation in FPR1: chemokine receptor	AR	N	Formylpeptide induced chemotaxis	Periodontitis only	136537
(g) Papillon–Lefèvre syndrome	Mutation in CTSC: cathepsin C activation of serine proteases	AR	N + M	Chemotaxis	Periodontitis, palmoplantar hyperkeratosis in some patients	245000
(h) Specific granule deficiencya	Mutation in C/EBPE: myeloid transcription factor	AR	N	Chemotaxis	Neutrophils with bilobed nuclei; absent secondary granules and defensins	245480
(i) Shwachman–Diamond syndrome	Mutation in SBDS: defective ribosome synthesis	AR	N	Chemotaxis	Pancytopenia, exocrine pancreatic insufficiency, chondrodysplasia	260400
3. Defects of respiratory burst
(a) X-linked chronic granulomatous disease (CGD)	Mutation in CYBB: electron transport protein (gp91phox)	XL	N + M	Killing (faulty O2−production)	Recurrent bacterial infection, susceptibility to fungal infection, inflammatory gut manifestations McLeod phenotype in patients with deletions extending into the contiguous Kell locus	306400
(b) Autosomal recessive CGD – p22 phox deficiency	Mutation in CYBA: electron transport protein (p22phox)	AR	N + M	Killing (faulty O2−production)	Recurrent bacterial infection, susceptibility to fungal infection, and inflammatory gut manifestations	233690
(c) Autosomal recessive CGD – p47 phox deficiency	Mutation in NCF1: adapter protein (p47phox)	AR	N + M	Killing (faulty O2−production)	Recurrent bacterial infection, susceptibility to fungal infection, and inflammatory gut manifestations	233700
(d) Autosomal recessive CGD – p67 phox deficiency	Mutation in NCF2: activating protein (p67phox)	AR	N + M	Killing (faulty O2−production)	Recurrent bacterial infection, susceptibility to fungal infection, inflammatory gut manifestations	233710
(e) Autosomal recessive CGD – p40 phox deficiencya	Mutation in NCF4: activating protein (p40phox)	AR	N + M	Killing (faulty O2−production)	Inflammatory gut manifestations only	601488
4. Mendelian susceptibility to mycobacterial disease (MSMD)
(a) IL-12 and IL-23 receptor β1 chain deficiency	Mutation in IL-12RB1: IL-12 and IL-23 receptor β1 chain	AR	L + NK	IFN-γ secretion	Susceptibility to Mycobacteria and Salmonella	209950
(b) IL-12p40 deficiency	Mutation in IL-12B: subunit p40 of IL-12/IL-23	AR	M	IFN-γ secretion	Susceptibility to Mycobacteria and Salmonella	161561
(c) IFN-γ receptor 1 deficiency	Mutation in IFNGR1: IFN-γR ligand binding chain	AR, AD	M + L	IFN-γ binding and signaling	Susceptibility to Mycobacteria and Salmonella	107470
(d) IFN-γ receptor 2 deficiency	Mutation in IFNGR2: IFN-γR accessory chain	AR	M + L	IFN-γ signaling	Susceptibility to Mycobacteria and Salmonella	147569
(e) STAT1 deficiency (AD form)a	Mutation in STAT1 (loss of function)	AD	M + L	IFN-γ signaling	Susceptibility to Mycobacteria	600555
(f) Macrophage gp91 phox deficiencya	Mutation in CYBB: electron transport protein (gp 91 phox)	XL	Mf only	Killing (faulty O2−production)	Isolated susceptibility to Mycobacteria	306400
(g) IRF8-deficiency (AD form)a	Mutation in IRF8: IL-12 production by CD1c+ MDC	AD	CD1c+ MDC	Differentiation of CD1c+ MDC subgroup	Susceptibility to Mycobacteria	601565
(h) ISG15	Mutation in ISG15; an interferon (IFN) α/β-inducible, ubiquitin-like intracellular protein	AR	M + N + L	IFN-γ secretion	Susceptibility to Mycobacteria	14751
5. Other defects
(a) IRF 8-deficiency (AR form)a	Mutation in IRF8: IL-12 production	AR	Monocytes peripheral DC	Cytopenias	Susceptibility to Mycobacteria, Candida, myeloproliferation	614893
(b) GATA2 deficiency (Mono MAC syndrome)	Mutation in GATA2: loss of stem cells	AD	Monocytes peripheral DC + NK + B	Multilineage cytopenias	Susceptibility to Mycobacteria, papilloma viruses, histoplasmosis, alveolar proteinosis, MDS/AML/CMML	137295
(c) Pulmonary alveolar proteinosisa	Mutation in CSF2RA	Biallelic mutations in pseudo-autosomal gene	Alveolar macro-phages	GM-CSF signaling	Alveolar proteinosis	306250

XL, X-linked inheritance; AR, autosomal recessive inheritance; AD, autosomal dominant inheritance; ACTB, actin beta; B, B lymphocytes; CEBPE, CCAAT/enhancer-binding protein epsilon; CMML, chronic myelomonocytic leukemia; CTSC, cathepsin C; CYBA, cytochrome .

.

Table .

Table 6

Defects in innate immunity.

Disease	Genetic defect/presumed pathogenesis	Inheritance	Affected cell	Functional defect	Associated features	OMIM number
1. Anhidrotic ectodermal dysplasia with immunodeficiency (EDA-ID)
(a) EDA-ID, X-linked (NEMO deficiency)	Mutations of NEMO (IKBKG), a modulator of NF-κB activation	XL	Lymphocytes + monocytes	NF-κB signaling pathway	Various infections (bacteria, Mycobacteria, viruses, and fungi)	300248
					Colitis
					EDA (not in all patients)
					Hypogammaglobulinemia to specific antibody polysaccharides deficiency
(b) EDA-ID, autosomal-dominanta	Gain-of-function mutations of IKBA, resulting in impaired activation of NF-κB	AD	Lymphocytes + monocytes	NF-κB signaling pathway	Various infections (bacteria, viruses, and fungi)	612132
					EDA
					T cell defect
2. TIR signaling pathway deficiency
(a) IRAK-4 deficiency	Mutations of IRAK-4, a component of TLR- and IL-1R-signaling pathway	AR	Lymphocytes + granulocytes + monocytes	TIR–IRAK signaling pathway	Bacterial infections (pyogenes)	607676
(b) MyD88 deficiency	Mutations of MYD88, a component of the TLR and IL-1R signaling pathway	AR	Lymphocytes + granulocytes + monocytes	TIR–MyD88 signaling pathway	Bacterial infections (pyogenes)	612260
3. HOIL1 deficiencya	Mutation of HOIL1, a component of LUBAC	AR	Lymphocytes + granulocytes + monocytes	NF-κB signaling pathway	Bacterial infections (pyogenes)	Not assigned
					Autoinflammation
					Amylopectinosis
4. WHIM (Warts, hypogammaglobulinemia, infections, myelokathexis) syndrome	Gain-of-function mutations of CXCR4, the receptor for CXCL12	AD	Granulocytes + lymphocytes	Increased response of the CXCR4 chemokine receptor to its ligand CXCL12 (SDF-1)	Warts/human papilloma virus (HPV) infection	193670
					Neutropenia
					Reduced B cell number
					Hypogammaglobulinemia
5. Epidermodysplasia verruciformis
EVER1 deficiency	Mutations of EVER1	AR	Keratinocytes and leukocytes	EVER proteins may be involved in the regulation of cellular zinc homeostasis in lymphocytes	HPV (group B1) infections and cancer of the skin (typical EV)	226400
EVER2 deficiency	Mutations of EVER2	AR	Keratinocytes and leukocytes	EVER proteins may be involved in the regulation of cellular zinc homeostasis in lymphocytes	HPV (group B1) infections and cancer of the skin (typical EV)	226400
6. Predisposition to severe viral infection
(a) STAT2 deficiencya	Mutations of STAT2	AR	T and NK cells	STAT2-dependent	Severe viral infections (disseminated vaccine-strain measles)	Not assigned
				IFN-α and -β response
(b) MCM4 deficiencya	Mutations in MCM4	AR	NK cells	DNA repair disorder	Viral infections (EBV, HSV, VZV)	609981
					Adrenal failure
					Short stature
7. Herpes simplex encephalitis (HSE)
(a) TLR3 deficiencya	(b) Mutations of TLR3	AD	Central nervous system (CNS) resident cells and fibroblasts	TLR3-dependent	Herpes simplex virus 1 encephalitis (incomplete clinical penetrance for all etiologies listed here)	613002
		AR		IFN-α, -β, and -λ induction
(b) UNC93B1 deficiencya	(a) Mutations of UNC93B1	AR	CNS resident cells and fibroblasts	UNC-93B-dependent	Herpes simplex virus 1 encephalitis	610551
				IFN-α, -β, and -λ induction
(c) TRAF3 deficiencya	(c) Mutations of TRAF3	AD	CNS resident cells and fibroblasts	TRAF3-dependent	Herpes simplex virus 1 encephalitis	614849
				IFN-α, -β, and -λ induction
(d) TRIF deficiencya	(c) Mutations of TRIF	AD	CNS resident cells and fibroblasts	TRIF-dependent	Herpes simplex virus 1 encephalitis	614850
		AR		IFN-α, -β, and -λ induction
(e) TBK1 deficiencya	(c) Mutations of TBK1	AD	CNS resident cells and fibroblasts	TBK1-dependent	Herpes simplex virus 1 encephalitis	Not assigned
				IFN-α, -β, and -λ induction
8. Predisposition to invasive fungal diseasesa
CARD9 deficiency	Mutations of CARD9	AR	Mononuclear phagocytes	CARD9 signaling pathway	Invasive candidiasis infection Deep dermatophytoses	212050
9. Chronic mucocutaneous candidiasis (CMC)
(a) IL-17RA deficiencya	(a) Mutations in IL-17RA	AR	Epithelial cells, fibroblasts, mononuclear phagocytes	IL-17RA signaling pathway	CMC Folliculitis	605461
(b) IL-17F deficiencya	(b) Mutations in IL-17F	AD	T cells	IL-17F-containing dimers	CMC Folliculitis	606496
(c) STAT1 gain-of-function	(c) Gain-of-function mutations in STAT1	AD	T cells	Gain-of-function STAT1 mutations that impair the development of IL-17-producing T cells	CMC	614162
					Various fungal, bacterial, and viral (HSV) infections
					Autoimmunity (thyroiditis, diabetes, cytopenia)
					Enteropathy
(d) ACT1 deficiencya	(c) Mutations in ACT1	AR	T cells, fibroblasts	Fibroblasts fail to respond to IL-17A and IL-17F, and their T cells to IL-17E	CMC	615527
					Blepharitis, folliculitis, and macroglossia
10. Trypanosomiasisa	Mutations in APOL-I	AD		APOL-I	Trypanosomiasis	603743
11. Isolated congenital asplenia (ICA)	Mutations in RPSA	AD	Spleen	RPSA encodes ribosomal protein SA, a component of the small subunit of the ribosome	Bacteremia (encapsulated bacteria) No spleen	271400

XL, X-linked inheritance; AR, autosomal recessive inheritance; AD, autosomal dominant inheritance; NF-κB, nuclear factor kappa B; TIR, Toll and interleukin 1 receptor; IFN, interferon; HVP, human papilloma virus; TLR, Toll-like receptor; IL, interleukin.

.

Eight new disorders have been added to Table .

XR-EDA-ID is highly heterogeneous clinically, both in terms of developmental features (some patients display osteopetrosis and lymphedema, in addition to EDA, while others do not display any developmental features) and infectious diseases (some display multiple infections, viral, fungal, and bacterial, while others display a single type of infection). The various OMIM entries correspond to these distinct clinical diseases.

Table 7

Autoinflammatory disorders.

Disease	Genetic defect/presumed pathogenesis	Inheritance	Affected cells	Functional defects	Associated features	OMIM number
1. Defects effecting the inflammasome
(a) Familial Mediterranean fever	Mutations of MEFV (lead to gain of pyrin function, resulting in inappropriate IL-1β release)	AR	Mature granulocytes, cytokine-activated monocytes	Decreased production of pyrin permits ASC-induced IL-1 processing and inflammation following subclinical serosal injury; macrophage apoptosis decreased	Recurrent fever, serositis, and inflammation responsive to colchicine. Predisposes to vasculitis and inflammatory bowel disease	249100
(b) Mevalonate kinase deficiency (hyper IgD syndrome)	Mutations of MVK (lead to a block in the mevalonate pathway). Interleukin-1beta mediates the inflammatory phenotype	AR		Affecting cholesterol synthesis; pathogenesis of disease is unclear	Periodic fever and leukocytosis with high IgD levels	260920
(c) Muckle–Wells syndrome	Mutations of CIAS1 (also called PYPAF1 or NALP3) lead to constitutive activation of the NLRP3 inflammasome	AD	PMNs monocytes	Defect in cryopyrin, involved in leukocyte apoptosis and NF-κB signaling and IL-1 processing	Urticaria, SNHL, amyloidosis	191900
(d) Familial cold autoinflammatory syndrome	Mutations of CIAS1 (see above) Mutations of NLRP12	AD	PMNs, monocytes	Same as above	Non-pruritic urticaria, arthritis, chills, fever, and leukocytosis after cold exposure	120100
5. Neonatal onset multisystem inflammatory disease (NOMID) or chronic infantile neurologic cutaneous and articular syndrome (CINCA)	Mutations of CIAS1 (see above)	AD	PMNs, chondrocytes	Same as above	Neonatal onset rash, chronic meningitis, and arthropathy with fever and inflammation	607115
2. Non inflammasome-related conditions
(a) TNF receptor-associated periodic syndrome (TRAPS)	Mutations of TNFRSF1 (resulting in increased TNF inflammatory signaling)	AD	PMNs, monocytes	Mutations of 55-kDa TNF receptor leading to intracellular receptor retention or diminished soluble cytokine receptor available to bind TNF	Recurrent fever, serositis, rash, and ocular or joint inflammation	142680
(b) Early-onset inflammatory bowel disease	Mutations in IL-10 (results in increase many proinflammatory cytokines)	AR	Monocyte/macrophage, activated T cells	IL-10 deficiency leads to increase of TNFγ and other proinflammatory cytokines	Early-onset enterocolitis enteric fistulas, perianal abscesses, chronic folliculitis	124092
(b) Early-onset inflammatory bowel disease	Mutations in IL-10RA (see above)	AR	Monocyte/macrophage, activated T cells	Mutation in IL-10 receptor alpha leads to increase of TNFγ and other proinflammatory cytokines	Early-onset enterocolitis enteric fistulas, perianal abscesses, chronic folliculitis	146933
(b) Early-onset inflammatory bowel disease	Mutations in IL-10RB (see above)	AR	Monocyte/macrophage, activated T cells	Mutation in IL-10 receptor beta leads to increase of TNFγ and other proinflammatory cytokines	Early-onset enterocolitis enteric fistulas, perianal abscesses, chronic folliculitis	123889
(c) Pyogenic sterile arthritis, pyoderma gangrenosum, acne (PAPA) syndrome	Mutations of PSTPIP1 (also called C2BP1) (affects both pyrin and protein tyrosine phosphatase to regulate innate and adaptive immune responses)	AD	Hematopoietic tissues, upregulated in activated T cells	Disordered actin reorganization leading to compromised physiologic signaling during inflammatory response	Destructive arthritis, inflammatory skin rash, myositis	604416
(d) Blau syndrome	Mutations of NOD2 (also called CARD15) (involved in various inflammatory processes)	AD	Monocytes	Mutations in nucleotide binding site of CARD15, possibly disrupting interactions with lipopolysaccharides and NF-κB signaling	Uveitis, granulomatous synovitis, camptodactyly, rash, and cranial neuropathies, 30% develop Crohn’s disease	186580
10. Chronic recurrent multifocal osteomyelitis and congenital dyserythropoietic anemia (Majeed syndrome)a	Mutations of LPIN2 (increased expression of the proinflammatory genes)	AR	Neutrophils, bone marrow cells	Undefined	Chronic recurrent multifocal osteomyelitis, transfusion-dependent anemia, cutaneous inflammatory disorders	609628
11. DIRA (deficiency of the interleukin 1 receptor antagonist)a	Mutations of IL-1RN (see functional defect)	AR	PMNs, monocytes	Mutations in the IL-1 receptor antagonist allow unopposed action of Interleukin 1	Neonatal onset of sterile multifocal osteomyelitis, periostitis, and pustulosis	612852
12. DITRA – deficiency of IL-36 receptor antagonist	Mutation in IL-36RN (see functional defect)	AR	Keratinocyte leukocytes	Mutations in IL-36RN leads to increase IL-8 production	Pustular psoriasis	614204
13. SLC29A3 mutation	Mutation in SLC29A3 (?)	AR	Leukocyte, bone cells	Macrophage activation?	Hyperpigmentation hypertrichosis	602782
14. CAMPS (CARD14 mediated psoriasis)	Mutation in CARD14 (see functional defect)	AD	Mainly in keratinocyte	Mutations in CARD14 activate the NF-κB pathway and production of IL-8	Psoriasis	173200
15. Cherubism	Mutation in SH3BP2 (see functional defect)	AD	Stroma cells, bone cells	Hyperactivated macrophage and increased NF-κB	Bone degeneration in jaws	11840
16. CANDLE (chronic atypical neutrophilic dermatitis with lipodystrophy)	Mutation in PSMB8 (see functional defect)	AD	Keratinocyte, B cell adipose cells	Mutations cause increase IL-6 production	Dystrophy, panniculitis	256040
17. HOIL1 deficiency	Mutation in HOIL1 (see functional defect)	AR	PMNs, fibroblast	Mutation in HOIL1 leads to IL-1β dysfunction	Immunodeficiency autoinflammation amylopectinosis	610924
18. PLAID (PLCγ2 associated antibody deficiency and immune dysregulation)	Mutation in PLCG2 (see functional defect)	AD	B cells, NK, mast cells	Mutations cause activation of IL-1 pathways	Cold urticaria hypogammaglobulinemia	614878

AR, autosomal recessive inheritance; AD, autosomal dominant inheritance; PMN, polymorphonuclear cells; ASC, apoptosis-associated speck-like protein with a caspase recruitment domain; CARD, caspase recruitment domain; CD2BP1, CD2 binding protein 1; PSTPIP1, proline/serine/threonine phosphatase-interacting protein 1; SNHL, sensorineural hearing loss; CIAS1, cold-induced autoinflammatory syndrome 1.

.

Autoinflammatory diseases are clinical disorders marked by abnormally increased inflammation, mediated predominantly by the cells and molecules of the innate immune system, with a significant host predisposition. While the genetic defect of one of the most common autoinflammatory conditions, PFAPA, is not known, recent studies suggest that it is associated with activation of IL-1 pathway and response to IL-1beta antagonists.

Muckle–Wells syndrome, familial cold autoinflammatory syndrome and neonatal onset multisystem inflammatory disease (NOMID), which is also called chronic infantile neurologic cutaneous and articular syndrome (CINCA) are caused by similar mutations in CIAS1 mutations. The disease phenotype in any individual appears to depend on modifying effects of other genes and environmental factors.