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Journal Article
Research Support, Non-U.S. Gov't
Cystic fibrosis mutation screening in healthy men with reduced sperm quality.
Human Reproduction 1996 March
The majority of men with cystic fibrosis (CF) are infertile due to a bilateral congenital absence of the vas deferens (CBAVD). However, clinically affected CF patients present a spectrum of genital phenotypes ranging from normal fertility to severely impaired spermatogenesis and CBAVD. Recently, it has become apparent that CF can manifest itself as isolated CBAVD in the absence of other clinical symptoms. The present study was undertaken to test the possible involvement of the CF gene in the aetiology of male infertility other than CBAVD. Semen specimens from 127 unrelated healthy males with various diagnoses of reduced sperm quality were screened for a panel of 13 mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene. Fourteen of 80 (17.5%) healthy men with infertility due to reduced sperm quality and 3 of 21 (14.3%) men with azoospermia had at least one CF mutation (one azoospermic male was a compound heterozygote). The frequency of mutations in our sample of infertile males was significantly higher than the expected CF carrier frequency in the local population (P = 0.00139). No mutations were found in a control group of 26 individuals with normal semen parameters. This increased frequency of CF mutations in healthy men with reduced sperm quality and in men with azoospermia without CBAVD suggests that the CFTR protein may be involved in the process of spermatogenesis or sperm maturation apart from playing a critical role in the development of the epididymal glands and the vas deferens.
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