We have identified polymorphisms of several genes that are associated with the human azoospermic population—MEI1, PRDM9 (MEISETZ), SPATA17, PARP-2, and UBR2 genes are genetic risk factors for the patients with azoospermia by meiotic arrest [48–52], and polymorphisms of the SEPTIN12 gene are associated with patients with Sertoli cell-only syndrome [53]. Here, PRDM9 is linked to Sertoli Cell-Only Syndrome.