O-GlcNAc transferase plays a non-catalytic role in C. elegans male fertility

Abstract

Animal behavior is influenced by the competing drives to maintain energy and to reproduce. The balance between these evolutionary pressures and how nutrient signaling pathways intersect with mating drive remains unclear. The nutrient sensor O-GlcNAc transferase, which post-translationally modifies intracellular proteins with a single monosaccharide, is responsive to cellular nutrient status and regulates diverse biological processes. Though essential in most metazoans, O-GlcNAc transferase (ogt-1) is dispensable in Caenorhabditis elegans, allowing genetic analysis of its physiological roles. Compared to control, ogt-1 males have a four-fold reduction in mean offspring, with nearly two thirds producing zero progeny. Interestingly, we found that isolated ogt-1 males are less likely to engage in mate-searching, and they initiate mating less often when exposed to mates. In addition, ogt-1 males which do initiate mating are less likely to continue with subsequent steps in the mating process, resulting in fewer successful sperm transfers. Lowering barriers to mating such as immobilizing mates or allowing more mating time significantly improves ogt-1 male mating. Surprisingly, we found high fertility levels for ogt-1 mutant males with hypodermal expression of wild-type ogt-1 and by ogt-1 harboring mutations that prevent the transfer of O-GlcNAc by OGT-1. This suggests OGT-1 serves a non-catalytic function in the hypodermis impacting the male mating drive. This study builds upon research on the nutrient sensor O-GlcNAc transferase and demonstrates a role it plays in the interplay between the evolutionary drives for reproduction and survival.