| First Author | Shao M | Year | 2008 |
| Journal | Dev Biol | Volume | 313 |
| Issue | 1 | Pages | 246-55 |
| PubMed ID | 18022613 | Mgi Jnum | J:130229 |
| Mgi Id | MGI:3771270 | Doi | 10.1016/j.ydbio.2007.10.013 |
| Citation | Shao M, et al. (2008) JAM-A is present in mammalian spermatozoa where it is essential for normal motility. Dev Biol 313(1):246-55 |
| abstractText | Junctional adhesion molecules (JAMs) that are expressed in endothelial and epithelial cells and function in tight junction assembly, also perform important roles in testis where the closely-related JAM-A, JAM-B, and JAM-C are found. Disruption of murine Jam-B and Jam-C has varying effects on sperm development and function; however, deletion of Jam-A has not yet been studied. Here we show for the first time that in addition to expression in the Sertoli-Sertoli tight junctions in the seminiferous tubules, the approximately 32 kDa murine JAM-A is present in elongated spermatids and in the plasma membrane of the head and flagellum of sperm. Deletion of Jam-A, using the gene trap technology, results in flagellar defects at the ultrastructural level. In Jam-A-deficient mice, which have reduced litter size, both progressive and hyperactive motility are significantly affected (P<0.0001) before and, more severely, after capacitation. The findings show that JAM-A is involved in sperm tail formation and is essential for normal motility, which may occur via its signal transduction and protein phosphorylation properties. Detection of JAM-A in human sperm proteins indicates that its role may be conserved in sperm motility and that JAM-A may be a candidate gene for the analysis of idiopathic sperm motility defects resulting in male subfertility in the human population. |
