Spermatogenic Failure 18, also known as spgf18, is related to spermatogenic failure 20 and non-syndromic male infertility due to sperm motility disorder. An important gene associated with Spermatogenic Failure 18 is DNAH1 (Dynein Axonemal Heavy Chain 1). Affiliated tissues include testis, and related phenotypes are male infertility and reduced sperm motility