SIN3 acts in distinct complexes to regulate the germline transcriptional program in C. elegans
Caron, M.; Robert, V. J.; Gely, L.; Adrait, A.; Pakulska, V.; Coute, Y.; Chevalier, M.; Riedel, C. G.; Bedet, C.; Palladino, F.
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The SIN3 transcriptional coregulator influences gene expression through multiple interactions that include histone deacetylases (HDACs). Haploinsufficiency and mutations in SIN3 are the underlying cause of Witteveen-Kolk syndrome and related intellectual disability (ID)/autism syndromes, emphasizing its key role in development. However, little is known about the diversity of its interactions and functions in developmental processes. Here we show that loss of SIN-3, the single SIN3 homologue in Caenorhabditis elegans, results in maternal effect sterility associated with deregulation of the germline transcriptome, including desilencing of X-linked genes. We identify at least two distinct SIN3 complexes containing specific HDACs, and show that they differentially contribute to fertility. Single cell smFISH reveals that in sin-3 mutants, the X chromosome becomes re-expressed prematurely and in a stochastic manner in individual germ cells. Furthermore, we identify histone residues whose acetylation increases in the absence of SIN3. Together, this work provides a powerful framework for the in vivo study of SIN3 and associated proteins.
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