CATSPER1 and oligospermia: Our study indicated a significant correlation between CATSPER1 (rs2845570) and SPATA16 (rs1515442) genes polymorphisms and idiopathic azoospermia and oligospermia; whereas, no correlation was found between TEX11 (rs143246552) gene polymorphism and idiopathic azoospermia and oligospermia (Table 3).