Program in Molecular Medicine
Cell Biology | Cellular and Molecular Physiology | Developmental Biology | Molecular Biology
Intraflagellar transport (IFT) is a conserved mechanism thought to be essential for the assembly and maintenance of cilia and flagella. However, little is known about its role in mammalian sperm flagella formation. To fill this gap, we disrupted the Ift20 gene in male germ cells. Homozygous mutant mice were infertile with significantly reduced sperm counts and motility. In addition, abnormally shaped elongating spermatid heads and bulbous round spermatids were found in the lumen of the seminiferous tubules. Electron microscopy revealed increased cytoplasmic vesicles, fiber-like structures, abnormal accumulation of mitochondria and a decrease in mature lysosomes. The few developed sperm had disrupted axonemes and some retained cytoplasmic lobe components on the flagella. ODF2 and SPAG16L, two sperm flagella proteins failed to be incorporated into sperm tails of the mutant mice, and in the germ cells, both were assembled into complexes with lighter density in the absence of IFT20. Disrupting IFT20 did not significantly change expression levels of IFT88, a component of IFT-B complex, and IFT140, a component of IFT-A complex. Even though the expression level of an autophagy core protein that associates with IFT20, ATG16, was reduced in the testis of the Ift20 mutant mice, expression levels of other major autophagy markers, including LC3 and ubiquitin were not changed. Our studies suggest that IFT20 is essential for male fertility and spermiogenesis in mice, and its major function is to transport cargo proteins for sperm flagella formation. It also appears to be involved in removing excess cytoplasmic components.
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© 2016 Zhang et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0). Citation: Mol Biol Cell. 2016 Nov 15; 27(23): 3705–3716. doi: 10.1091/mbc.E16-05-0318. Link to article on publisher's site
IFT20, male fertility, spermiogenesis, mice, flagella
Molecular biology of the cell
Zhang, Zhengang; Li, Wei; Zhang, Yong; Zhang, Ling; Teves, Maria E.; Liu, Hong; Strauss, Jerome F. 3rd; Pazour, Gregory J.; Foster, James A.; Hess, Rex A.; and Zhang, Zhibing, "Intraflagellar transport protein IFT20 is essential for male fertility and spermiogenesis in mice" (2016). University of Massachusetts Medical School Faculty Publications. 1353.
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.