46, XY disorder of sexual development resulting from a novel monoallelic mutation (p.Ser31Phe) in the steroid 5α‐reductase type‐2 (SRD5A2) gene. Issue 4 (16th March 2014)

• Record Type: Journal Article
• Authors: Chávez, Bertha; Ramos, Luis; Gómez, Rita; Vilchis, Felipe
• Is Part Of: Molecular genetics & genomic medicine. Volume 2:Issue 4(2014:Jul.)
• Page Start: 292
• Page End: 296
• Publication Date: 2014-03-16
• Subjects: Medical genetics -- Periodicals; Genomics -- Periodicals; 616.042
• DOI: 10.1002/mgg3.76
• Languages: English
• ISSNs: 2324-9269

Abstract

<abstract abstract-type="main" id="mgg376-abs-0001"> <title>Abstract</title> <p>Inactivating mutations of the 5<italic>α</italic>‐steroid reductase type‐2 (<italic>SRD5A2</italic>) gene result in a broad spectrum of masculinization defects, ranging from a male phenotype with hypospadias to a female phenotype with Wolffian structures. Molecular studies of the <italic>SRD5A2</italic> revealed a new heterozygous gene variant within the coding region that results in phenotypic expression. A c.92C&gt;T transition changing serine to phenylalanine at codon 31 of exon 1 (p.Ser31Phe) was identified in a patient with 46, XY disorder of sexual development who displayed glandular hypospadias with micropenis and bilateral cryptorchidism. The restoration of the p.Ser31Phe mutation by site‐directed mutagenesis and transient expression assays using cultured HEK‐293 cells showed that this novel substitution does not abolish but does deregulate the catalytic efficiency of the enzyme. Thus, the maximum velocity (<italic>V</italic>_max) value was higher for the mutant enzyme (22.5 ± 6.9 nmol DHT mg protein⁻¹ h⁻¹) than for the wild‐type enzyme (9.8 ± 2.0 nmol DHT mg protein⁻¹ h⁻¹). Increased in vitro activity of the p.Ser31Phe mutant suggested an activating effect. This case provides evidence that heterozygous missense mutations in <italic>SRD5A2</italic> may induce the abnormal development of male external genitalia.</p> </abstract>