Impact of DNAH3 Deficiency on Sperm Energy Metabolism and Motility Leading to Asthenozoospermia

Asthenozoospermia, a prevalent contributor to male infertility, exhibits a multifaceted pathogenesis. This study identified a significant downregulation in sperm dynein heavy chain 3 (DNAH3) protein levels in individuals with asthenozoospermia. To elucidate the role of DNAH3 in asthenozoospermia, we constructed Dnah3-knockout (KO) mice, which exhibited asthenozoospermia and sterility. The sperm motility of Dnah3-KO mice significantly declined compared to wild-type mice. However, spermatozoa from Dnah3-KO mice displayed normal morphology in haematoxylin-eosin staining and transmission electron microscopy analyses. Sperm metabolomics revealed that DNAH3 deficiency disturbed sperm energy metabolism, resulting in substantial reductions of L-palmitoylcarnitine and Glycocholic acid. Notably, offspring were successfully obtained from Dnah3-KO male mice through intracytoplasmic sperm injection. Collectively, these findings indicate that DNAH3 deficiency induces disturbances in energy metabolism, rather than abnormalities in sperm flagellar morphology, culminating in asthenozoospermia development. Our investigation provides valuable insights into understanding asthenozoospermia and offers guidance for clinical consultation.