Primate‐specific DAZ (deleted in azoospermia) is assumed to be the most important gene in the AZFc region.[9, 10] There are four copies of DAZ in this region and deletion of the entire AZFc region results in the loss of these copies and spermatogenic failure.[11]DAZ is expressed predominantly in the testis and has been found in Catarrhini (Old World monkeys, apes, and humans) but not in New World monkeys or mice.[9, 12, 13] The role of DAZ in spermatogenesis and the exact molecular mechanisms involved remain unclear because the function of DAZ cannot be evaluated in a mouse model. Here, DAZ1 is linked to Azoospermia.