PT - JOURNAL ARTICLE AU - Kubota, Yukihiro AU - Ohnishi, Yuto AU - Hamasaki, Tasuku AU - Yasui, Gen AU - Ota, Natsumi AU - Kitagawa, Hiromu AU - Esaki, Arashi AU - Fahmi, Muhamad AU - Ito, Masahiro TI - Overlapping and non-overlapping roles of the class-I histone deacetylase-1 corepressors, LET-418, SIN-3, and SPR-1 in <em>Caenorhabditis elegans</em> embryonic development AID - 10.1101/2020.07.21.213561 DP - 2020 Jan 01 TA - bioRxiv PG - 2020.07.21.213561 4099 - http://biorxiv.org/content/early/2020/07/21/2020.07.21.213561.short 4100 - http://biorxiv.org/content/early/2020/07/21/2020.07.21.213561.full AB - Histone deacetylases (HDACs) are divided into four classes. Class-I HDAC, HDAC-1 forms three types of complexes, namely the Nucleosome Remodeling Deacetylase complex, the Sin3 complex, and the CoREST complex, with specific corepressor component Mi2/CHD-3, Sin3, and RCOR1 in human, respectively. The functions of these HDAC-1 complexes are regulated by their corepressors, however, their exact mechanistic roles in several biological processes remain unexplored, such as in embryonic development. Here, we report that each of the corepressors, LET-418, SIN-3, and SPR-1, the homologous of Mi2, Sin3, and RCOR1, respectively, were expressed throughout Caenorhabditis elegans embryonic development and served essential roles in the process. Moreover, genetic analysis suggested that three pathways (i.e., LET-418– SIN-3–SPR-1, SIN-3–SPR-1, and LET-418) participated in embryonic development. Our terminal-phenotype observations of single mutants of each corepressor implied that LET-418, SIN-3, and SPR-1 played similar roles in promoting advancement to the middle and late embryonic stages. Genome-wide comparative-transcriptome analysis indicated that 47.5% and 42.3% of genes were commonly increased and decreased in sin-3 and spr-1 mutants, respectively. These results suggest that among the three pathways studied, the SIN-3–SPR-1 pathway mainly serves to regulate embryonic development. Comparative-Gene Ontology analysis indicated that these three pathways played overlapping and distinct roles in regulating C. elegans embryonic development.