Conversion of testosterone (T) to dihydrotestosterone (DHT) in genital tissue is catalysed by the enzyme 5a-reductase 2, which is encoded by the SRD5A2 gene. The potent androgen DHT is required for full masculinization of the external genitalia. Mutations of the SRD5A2 gene inhibit enzyme activity,
Male pseudohermaphroditism due to 5α-reductase deficiency in a Swedish family
✍ Scribed by S. -A. Ivarsson; M. Damkjaer Nielsen; T. Lindberg
- Publisher
- Springer
- Year
- 1988
- Tongue
- English
- Weight
- 881 KB
- Volume
- 147
- Category
- Article
- ISSN
- 0340-6997
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✦ Synopsis
Three sibs with an inherited form of male pseudohermaphroditism are described. They were all born with ambiguous external genitalia but no diagnosis of a possible enzyme defect was made during childhood. First seen at the ages of 16, 14 and 10 years respectively, they were investigated in order to establish the pathogenetic nature of the disorder. Serum concentrations of testosterone and dihydrotestosterone before and after stimulation with human chorionic gonadotropin suggested 5 alpha-reductase deficiency. Measurement of steroid metabolites in urine confirmed this diagnosis. It is essential to recognize this condition in order to decide the sex of rearing of the children.
📜 SIMILAR VOLUMES
This report describes the identification of a point mutation in the 5␣-reductase type 2 (5␣-SR2) gene from a family in which both sibs (6 and 3 years old) have steroid 5␣-reductase 2 deficiency. The five exons of the gene were individually amplified by the polymerase chain reaction (PCR) and analyse