CATSPER2 and Azoospermia: In one other patient with azoospermia, two compound heterozygous deletions in the long arm of chromosome 15 (15q15.3) encompassing CATSPER2 were detected (the recurrent deletion of both STRC and CATSPER225 and an atypical smaller deletion with only CATSPER2 involved), effectively resulting in a homozygous deletion of CATSPER2 that is associated with asthenoteratozoospermia and not azoospermia.