DAZ1 and Infertility: Therefore, we undertook the present study to test the following hypotheses: a) whether deletion events of AZF regions on the Y chromosome in the diverse Indian population are associated with infertility; b) if partial deletions of the AZFc region are risk factors for spermatogenic failure among idiopathic infertile India men; c) whether the AZFc partial deletions associated with spermatogenic defects are due of lack of DAZ and CDY1 copies; and d) if any specific Y chromosome haplogroup is associated with any type of AZF deletion type and infertility.