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Publication : Autophagic elimination of ribosomes during spermiogenesis provides energy for flagellar motility.

First Author  Lei Y Year  2021
Journal  Dev Cell Volume  56
Issue  16 Pages  2313-2328.e7
PubMed ID  34428398 Mgi Jnum  J:308934
Mgi Id  MGI:6754079 Doi  10.1016/j.devcel.2021.07.015
Citation  Lei Y, et al. (2021) Autophagic elimination of ribosomes during spermiogenesis provides energy for flagellar motility. Dev Cell 56(16):2313-2328.e7
abstractText  How autophagy initiation is regulated and what the functional significance of this regulation is are unknown. Here, we characterized the role of yeast Vac8 in autophagy initiation through recruitment of PIK3C3-C1 to the phagophore assembly site (PAS). This recruitment is dependent on the palmitoylation of Vac8 and on its middle ARM domains for binding PIK3C3-C1. Vac8-mediated anchoring of PIK3C3-C1 promotes PtdIns3P generation at the PAS and recruitment of the PtdIns3P binding protein Atg18-Atg2. The mouse homolog of Vac8, ARMC3, is conserved and functions in autophagy in mouse testes. Mice lacking ARMC3 have normal viability but show complete male infertility. Proteomic analysis indicated that the autophagic degradation of cytosolic ribosomes was blocked in ARMC3-deficient spermatids, which caused low energy levels of mitochondria and motionless flagella. These studies uncovered a function of Vac8/ARMC3 in PtdIns3-kinase anchoring at the PAS and its physical significance in mammalian spermatogenesis with a germ tissue-specific autophagic function.
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