OBJECTIVES: Familial risk estimates are useful for genetic counseling, etiological understanding, and design of gene identification studies. We wanted to estimate the associations of ulcerative colitis (UC) and Crohn's disease (CD) with 32 autoimmune and related diseases among parents and offspring, singleton siblings, twins, and spouses. METHODS: The Multigeneration Register in Sweden provides reliable access to information on families among 11.5 million individuals throughout the last century. The diseases in individual family members were obtained through linkage to the Hospital Discharge Register. Standardized incidence ratios (SIRs) and 95% confidence intervals were calculated as relative risks for UC/CD in family members of patients diagnosed with any of the 34 diseases compared with those lacking affected family members through years 1964-2004. RESULTS: Among a total of 441,642 patients diagnosed with autoimmune and related conditions, 25,846 were diagnosed with UC and 18,885 with CD. Familial cases amounted to 5.4% of all UC patients and 6.5% of CD patients. SIR for UC was 3.9 (95% confidence interval 3.5-4.3) in offspring of affected parents, 4.6 (3.0-7.4) in siblings, 10.4 (6.5-15.8) in families of affected parents and siblings, and 6.3 (1.9-17.7) for monozygotic twins. The respective SIRs for CD were 6.0 (5.4-6.7), 6.3 (4.1-9.8), 34.0 (24.9-45.3), and 23.4 (10.1-51.1). All discordant associations, i.e., those between CD and other diseases, were also found for UC, including ankylosing spondylitis, asthma, polymyalgia rheumatica, psoriasis, and sarcoidosis. For UC, six additional associations were observed. No correlations between specific diseases were found among spouses, but between UC or CD and any disease it was 1.1 (1.0-1.1). CONCLUSIONS: The concordant familial risks for UC and CD were lower than those commonly cited. Both diseases are associated with several autoimmune and related diseases, suggesting genetic sharing.
OBJECTIVES: Familial risk estimates are useful for genetic counseling, etiological understanding, and design of gene identification studies. We wanted to estimate the associations of ulcerative colitis (UC) and Crohn's disease (CD) with 32 autoimmune and related diseases among parents and offspring, singleton siblings, twins, and spouses. METHODS: The Multigeneration Register in Sweden provides reliable access to information on families among 11.5 million individuals throughout the last century. The diseases in individual family members were obtained through linkage to the Hospital Discharge Register. Standardized incidence ratios (SIRs) and 95% confidence intervals were calculated as relative risks for UC/CD in family members of patients diagnosed with any of the 34 diseases compared with those lacking affected family members through years 1964-2004. RESULTS: Among a total of 441,642 patients diagnosed with autoimmune and related conditions, 25,846 were diagnosed with UC and 18,885 with CD. Familial cases amounted to 5.4% of all UC patients and 6.5% of CDpatients. SIR for UC was 3.9 (95% confidence interval 3.5-4.3) in offspring of affected parents, 4.6 (3.0-7.4) in siblings, 10.4 (6.5-15.8) in families of affected parents and siblings, and 6.3 (1.9-17.7) for monozygotic twins. The respective SIRs for CD were 6.0 (5.4-6.7), 6.3 (4.1-9.8), 34.0 (24.9-45.3), and 23.4 (10.1-51.1). All discordant associations, i.e., those between CD and other diseases, were also found for UC, including ankylosing spondylitis, asthma, polymyalgia rheumatica, psoriasis, and sarcoidosis. For UC, six additional associations were observed. No correlations between specific diseases were found among spouses, but between UC or CD and any disease it was 1.1 (1.0-1.1). CONCLUSIONS: The concordant familial risks for UC and CD were lower than those commonly cited. Both diseases are associated with several autoimmune and related diseases, suggesting genetic sharing.
Authors: Tina Kiguradze; Finola M Bruins; Nicholas Guido; Tanya Bhattacharya; Alfred Rademaker; Aleksandra G Florek; Alba Posligua; Shatil Amin; Anne E Laumann; Dennis P West; Beatrice Nardone Journal: Int J Dermatol Date: 2017-02-19 Impact factor: 2.736
Authors: Adrian Cortes; Johanna Hadler; Jenny P Pointon; Philip C Robinson; Tugce Karaderi; Paul Leo; Katie Cremin; Karena Pryce; Jessica Harris; Seunghun Lee; Kyung Bin Joo; Seung-Cheol Shim; Michael Weisman; Michael Ward; Xiaodong Zhou; Henri-Jean Garchon; Gilles Chiocchia; Johannes Nossent; Benedicte A Lie; Øystein Førre; Jaakko Tuomilehto; Kari Laiho; Lei Jiang; Yu Liu; Xin Wu; Linda A Bradbury; Dirk Elewaut; Ruben Burgos-Vargas; Simon Stebbings; Louise Appleton; Claire Farrah; Jonathan Lau; Tony J Kenna; Nigil Haroon; Manuel A Ferreira; Jian Yang; Juan Mulero; Jose Luis Fernandez-Sueiro; Miguel A Gonzalez-Gay; Carlos Lopez-Larrea; Panos Deloukas; Peter Donnelly; Paul Bowness; Karl Gafney; Hill Gaston; Dafna D Gladman; Proton Rahman; Walter P Maksymowych; Huji Xu; J Bart A Crusius; Irene E van der Horst-Bruinsma; Chung-Tei Chou; Raphael Valle-Oñate; Consuelo Romero-Sánchez; Inger Myrnes Hansen; Fernando M Pimentel-Santos; Robert D Inman; Vibeke Videm; Javier Martin; Maxime Breban; John D Reveille; David M Evans; Tae-Hwan Kim; Bryan Paul Wordsworth; Matthew A Brown Journal: Nat Genet Date: 2013-06-09 Impact factor: 38.330