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Human Reproduction, Vol. 14, No. 12, 3035-3040, December 1999
© 1999 European Society of Human Reproduction and Embryology

Complete mutational screening of the cystic fibrosis transmembrane conductance regulator gene: cystic fibrosis mutations are not involved in healthy men with reduced sperm quality

Nathalie Pallares-Ruiz1, Soukeyna Carles1, Marie Des Georges1, Caroline Guittard1, Françoise Arnal2, Claude Humeau2 and Mireille Claustres1,3

1 Laboratoire de Génétique Moléculaire, Institut de Biologie, CHU, CNRS IGH UPR 1142, 2 Hôpital Arnaud de Villeneuve, Laboratoire de Biologie de la Reproduction, 34060 Montpellier Cedex, France

Based on the analysis of the most frequent mutations responsible for cystic fibrosis (CF), a higher than expected frequency of CF mutations was recently reported in men with infertility due to reduced sperm quality. To further document whether this condition is associated with severe or mild abnormalities of cystic fibrosis transmembrane conductance regulator (CFTR) functions, we carried out a complete scanning of CFTR sequences using a strategy that detects almost all 850 mutations and 150 polymorphisms reported to date in the CFTR gene. We have investigated a cohort of 56 patients with severe oligoasthenoteratozoospermia (OAT) and 50 controls from southern France for CFTR gene mutations and variations. The frequencies of CF-causing mutations and CFTR variations identified in this OAT sample did not differ significantly from the frequencies found in the normal population. However, we observed a 1.7-fold increase in the proportion of homozygotes for a specific CFTR haplotype (TG11-T7-G1540) in the OAT group (P = 0.025). Our results do not confirm a link between CF mutations and reduced sperm quality. Further studies are needed to substantiate the hypothesis that a combination of variants affecting expression and function of the CFTR protein is associated with male infertility.

Key words: cystic fibrosis mutations/CFTR mutant polyvariants/oligoasthenoteratozoospermia

3 To whom correspondence should be addressed


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