Mutation analysis of the SRD5A2, AR and SF-1 genes in 52 Chinese boys with hypospadias.

OBJECTIVES

To investigate the prevalence of genetic mutations in steroid 5α-reductase-2 (SRD5A2), androgen receptor (AR) and steroidogenic factor-1 (SF-1) in Chinese children with hypospadias, and to also explore the possible underlying molecular mechanisms of this disease.

METHODS

A total of 52 boys with hypospadias were enrolled. Mutational analyses of the SRD5A2, AR and SF-1 genes were performed by direct sequencing.

RESULTS

SRD5A2 gene mutations were found in 13.5% (7/52 cases), including five compound heterozygotic and two homozygotic mutations. One novel heterozygotic SF-1 gene mutation was identified in a patient with perineal hypospadias and cryptorchidism, the patient's mother also had the same mutation. No mutation was found in the AR gene. The clinical manifestations of patients with mutations in SRD5A2 or SF-1 varied.

CONCLUSIONS

In Chinese patients, SRD5A2 gene mutations were, relatively, frequently associated with hypospadias. The SF-1 gene may be another candidate gene for hypospadias. In contrast, AR gene mutations are not commonly associated with this condition.