Abstract
Oocyte and preimplantation embryo development entail dynamic changes in chromatin structure and gene expression, which are regulated by a number of maternal and zygotic epigenetic factors. Histone deacetylases (HDACs), which tighten chromatin structure, repress transcription and gene expression by removing acetyl groups from histone or non-histone proteins. HDAC1 and HDAC2 are two highly homologous Class I HDACs and display compensatory or specific roles in different cell types or in response to different stimuli and signaling pathways. We summarize here the current knowledge about the functions of HDAC1 and HDAC2 in regulating histone modifications, transcription, DNA methylation, chromosome segregation, and cell cycle during oocyte and preimplantation embryo development. What emerges from these studies is that although HDAC1 and HDAC2 are highly homologous, HDAC2 is more critical than HDAC1 for oocyte development and reciprocally, HDAC1 is more critical than HDAC2 for preimplantation development.
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