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Volume 10, Issue 5 (September 2008) 10, 815–818; 10.1111/j.1745-7262.2008.00350.x
Molecular diagnosis of 5α-reductase-2 gene mutation in two Indian families with male pseudohermaphroditism
Marumudi Eunice1, Pascal Philibert3, Bindu Kulshreshtha1, Françoise Audran3, Françoise Paris3, Madan L Khurana1, Praveen E Pulikkanath1, Kiran Kucheria2, Charles Sultan3 and Ariachery C Ammini1
1 Department of Endocrinology and Metabolism, All India Institute of Medical Sciences, Ansari Nagar, New Delhi-110029, India
2 Department of Anatomy, All India Institute of Medical Sciences, Ansari Nagar, New Delhi-110029, India
3 Pediatric Endocrine Unit and the Hormones Laboratory of the University Hospital of Montpellier, 34295 Montpellier, Cedex 5, France
Correspondence: Ariachery C Ammini MD, DM, Department of Endocrinology and Metabolism, All India Institute of Medical Sciences, New Delhi 110029, India. Fax: +91-11-2658-9162. E-mail: aca433@yahoo.com
Received 16 May 2007; Accepted 23 August 2007.
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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.
Keywords: male pseudohermaphroditism, 5αRD-2 deficiency, dihydrotestosterone, SRD5A2 gene mutation, perineoscrotal hypospadias
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