title: Increased frequency of CFTR gene mutations identified in Indian infertile men with non-CBAVD obstructive azoospermia and spermatogenic failure.
abstract: High incidence of mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene is associated with congenital bilateral absence of the vas deferens (CBAVD) and is considered as the genital form of cystic fibrosis (CF). The CFTR gene may also be involved in the etiology of male infertility in cases other than CBAVD. The present study was conducted to identify the spectrum and frequency of CFTR gene mutations in infertile Indian males with non-CBAVD obstructive azoospermia (n=60) and spermatogenic failure (n=150). Conspicuously higher frequency of heterozygote F508del mutation was detected in infertile males with non-CBAVD obstructive azoospermia (11.6%) and spermatogenic failure (7.3%). Homozygous IVS(8)-5T allele frequency was also significantly higher in both groups in comparison to those in normal healthy individuals. Two mutations in exon 25 viz., R1358I and K1351R were identified as novel mutations in patients with non-CBAVD obstructive azoospermia. Mutation R1358I was predicted as probably damaging CFTR mutation. This is the first report from the Indian population, emphasizing increased frequency of CFTR gene mutations in male infertility other than CBAVD. Thus, it is suggested that screening of CFTR gene mutations may be required in infertile Indian males with other forms of infertility apart from CBAVD and willing for assisted reproduction technology.
authors.affiliation: Department of Biochemistry, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India.
authors.forename: Himanshu
authors.initials: H
authors.lastname: Sharma
authors.affiliation: Department of Urology, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India.
authors.forename: Ravimohan S
authors.initials: RS
authors.lastname: Mavuduru
authors.affiliation: Department of Urology, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India.
authors.forename: Shrawan Kumar
authors.initials: SK
authors.lastname: Singh
authors.affiliation: Department of Biochemistry, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India. Electronic address: fateh1977@yahoo.com.
authors.forename: Rajendra
authors.initials: R
authors.lastname: Prasad
mesh_terms: D000328:Adult; D053713:Azoospermia / Q000235:genetics* / Q000473:pathology; D019005:Cystic Fibrosis Transmembrane Conductance Regulator / Q000235:genetics*; D005787:Gene Frequency; D006579:Heterozygote; D006801:Humans; D007194:India; D007248:Infertility, Male / Q000235:genetics* / Q000503:physiopathology; D008297:Male; D052801:Male Urogenital Diseases / Q000235:genetics; D009154:Mutation; D013091:Spermatogenesis / Q000235:genetics*; D014649:Vas Deferens / Q000002:abnormalities
chemical_list: C505032:CFTR protein, human; D019005:Cystic Fibrosis Transmembrane Conductance Regulator
keywords: Assisted reproduction technology; CFTR; Cystic fibrosis; Male infertility; Mutations