To conduct a comparative analysis, we chose 12 CFTR gene variants that are common among infertile Russian men, based on a previous study of Chernykh et al.: F508del, CFTRdele2,3(21kb), L138ins, W1282X, 1677delTA, 3849+10kbC>T, E92K, 2143delT, G542X (c.1624G>T; p.Gly542Ter), 2184insA (c.2052dup; p.Gln685ThrfsTer4), N1303K, and R334W (c.1000C>T; p.Arg334Trp) [6]. The gene discussed is CFTR; the disease is Infertility.