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Molecular diagnosis of 5α-reductase-2 gene mutation in two Indian families with male pseudohermaphroditism

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Abstract

Aim: To identify the genotype of two Indians with male pseudohermaphroditism. Methods: Standard radioimmu-noassay procedure was used for estimating hormonal levels. Conventional cytogenetic analysis was carried out for diagnosing the genetic sex in these subjects with genital ambiguity. Molecular analysis was carried out by standard polymerase chain reaction procedure using different sets of primers and reaction conditions specific for the 5α-reductase type 2 gene (SRD5A2) gene. Direct sequencing was carried out using the ABI Prism dye terminator sequencing kit and the ABI 310 sequencing apparatus. Results: We found an SRD5A2 gene mutation in exon 5, where arginine is substituted with glutamine (R246Q), in two males with pseudohermaphroditism and ambiguous genitalia from unrelated families. This is the first time this mutation has been reported in individuals from India. Conclusion: Identification of the R246Q mutation of the SRD5A2 gene from two unrelated Indian families possibly extends the founder gene effect.
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Keywords: 5αRD-2 deficiency; SRD5A2 gene mutation; dihydrotestosterone; male pseudohermaphroditism; perineoscrotal hypospadias

Document Type: Case Report

Affiliations: 1: Department of Endocrinology and Metabolism, All India Institute of Medical Sciences, Ansari Nagar, New Delhi-110029, India 2: Pediatric Endocrine Unit and the Hormones Laboratory of the University Hospital of Montpellier, 34295 Montpellier, Cedex 5, France 3: Department of Anatomy, All India Institute of Medical Sciences, Ansari Nagar, New Delhi-110029, India

Publication date: 2008-09-01

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