If our finding will be confirmed on larger series of patients, DAZ gene dysfunctions may be proved to account for a larger portion of cases of infertility than one could expect by simply analyzing the prevalence of Yq deletions among these subjects; iii) we found that several genes that are mainly related to the postmeiotic phase of the spermatogenesis and have been previously reported as involved in male infertility are dowregulated in patients with AZFc deletions. The gene discussed is DAZ1; the disease is Infertility.