BACKGROUND/ PURPOSE: Noonan syndrome (NS) is inherited as an autosomal dominant disorder with dysmorphic facies, short stature, and cardiac defects, which can be caused by missense mutations in the protein tyrosine phosphatase nonreceptor type 11 (PTPN11) gene, which encodes src homology region 2 domain containing tyrosine phosphatase-2 (SHP-2), a protein tyrosine phosphatase that acts in signal transduction downstream to growth factors and cytokines. The current study aimed to study the molecular characterization of the PTPN11 gene among Egyptian patients with Noonan syndrome. METHODS: Eleven exons of the PTPN11 gene were amplified and screened by single stranded conformational polymorphism (SSCP). DNA samples showing band shift in SSCP were subjected to sequencing. RESULTS: Mutational analysis of the PTPN11 gene revealed T→C transition at position 854 in exon 8, predicting Phe285Ser substitution within PTP domain of SHP-2 protein, in one NS patient and -21C→T polymorphism in intron 7 in four other cases. CONCLUSION: Knowing that NS is phenotypically heterogeneous, molecular characterization of the PTPN11 gene should serve to establish NS diagnosis in patients with atypical features, although lack of a mutation does not exclude the possibility of NS.
BACKGROUND/ PURPOSE:Noonan syndrome (NS) is inherited as an autosomal dominant disorder with dysmorphic facies, short stature, and cardiac defects, which can be caused by missense mutations in the protein tyrosine phosphatase nonreceptor type 11 (PTPN11) gene, which encodes src homology region 2 domain containing tyrosine phosphatase-2 (SHP-2), a protein tyrosine phosphatase that acts in signal transduction downstream to growth factors and cytokines. The current study aimed to study the molecular characterization of the PTPN11 gene among Egyptian patients with Noonan syndrome. METHODS: Eleven exons of the PTPN11 gene were amplified and screened by single stranded conformational polymorphism (SSCP). DNA samples showing band shift in SSCP were subjected to sequencing. RESULTS: Mutational analysis of the PTPN11 gene revealed T→C transition at position 854 in exon 8, predicting Phe285Ser substitution within PTP domain of SHP-2 protein, in one NSpatient and -21C→T polymorphism in intron 7 in four other cases. CONCLUSION: Knowing that NS is phenotypically heterogeneous, molecular characterization of the PTPN11 gene should serve to establish NS diagnosis in patients with atypical features, although lack of a mutation does not exclude the possibility of NS.
Authors: Paul Kruszka; Antonio R Porras; Yonit A Addissie; Angélica Moresco; Sofia Medrano; Gary T K Mok; Gordon K C Leung; Cedrik Tekendo-Ngongang; Annette Uwineza; Meow-Keong Thong; Premala Muthukumarasamy; Engela Honey; Ekanem N Ekure; Ogochukwu J Sokunbi; Nnenna Kalu; Kelly L Jones; Julie D Kaplan; Omar A Abdul-Rahman; Lisa M Vincent; Amber Love; Khadija Belhassan; Karim Ouldim; Ihssane El Bouchikhi; Anju Shukla; Katta M Girisha; Siddaramappa J Patil; Nirmala D Sirisena; Vajira H W Dissanayake; C Sampath Paththinige; Rupesh Mishra; Eva Klein-Zighelboim; Bertha E Gallardo Jugo; Miguel Chávez Pastor; Hugo H Abarca-Barriga; Steven A Skinner; Eloise J Prijoles; Eben Badoe; Ashleigh D Gill; Vorasuk Shotelersuk; Patroula Smpokou; Monisha S Kisling; Carlos R Ferreira; Leon Mutesa; Andre Megarbane; Antonie D Kline; Amy Kimball; Emmy Okello; Peter Lwabi; Twalib Aliku; Emmanuel Tenywa; Nonglak Boonchooduang; Pranoot Tanpaiboon; Antonio Richieri-Costa; Ambroise Wonkam; Brian H Y Chung; Roger E Stevenson; Marshall Summar; Kausik Mandal; Shubha R Phadke; María G Obregon; Marius G Linguraru; Maximilian Muenke Journal: Am J Med Genet A Date: 2017-07-27 Impact factor: 2.802