Aim: To investigate the association of the( TAAAA) n polymorphism in the sex hormone-binding globulin( SHBG) gene promoter with idiopathic male infertility in Henan Han population. Methods: Semen samples of 288 men with idiopathic infertility and blood samples of 259 normal controls were collected. Genomic DNA was extracted by phenolchloroform method and target fragment was amplified by PCR. The Y-chromosome microdeletion was examined in all samples. The gene polymorphism was obtained by PAGE,silver stainin...