Polycomb in female reproductive health: patterning the present and programming the future
Ellen G. Jarred
A * and Patrick S. Western A *
A
Handling Editor: Jennifer Juengel
Abstract
Epigenetic modifications regulate chromatin accessibility, gene expression, cell differentiation and tissue development. As epigenetic modifications can be inherited via mitotic and meiotic cell divisions, they enable a heritable memory of cell identity and function and can alter inherited characteristics in the next generation. Tight regulation of epigenetic information is critical for normal cell function and is often disrupted in diseases including cancer, metabolic, neurological and inherited congenital conditions. The ovary performs critical functions in female reproductive health and fertility, including oocyte and sex-hormone production. Oocytes undergo extensive epigenetic programming including the establishment of maternal genomic imprints, which are critical for offspring health and development. Epigenetic modifiers also regulate ovarian somatic cells, such as granulosa and theca cells which support oocytes and produce hormones. While ovarian dysfunction contributes to serious ovarian conditions such as primary ovarian insufficiency (POI), polycystic ovary syndrome (PCOS) and ovarian cancers, the roles of epigenetic modifications in the ovary and their contribution to ovarian dysfunction are not properly understood. Here we review recent advancements in understanding Polycomb proteins, important epigenetic modifiers that have emerging roles in ovarian development and maternal epigenetic inheritance. Polycomb group proteins (PcGs) contribute to the faithful establishment of epigenetic information in oocytes, a process essential for normal offspring development in mice. Emerging evidence also indicates that PcGs regulate ovarian function and female fertility. Understanding these and similar mechanisms will provide greater insight into the epigenetic regulation of ovarian and oocyte function, and how its disruption can impact reproductive health and maternal inheritance.
Keywords: epigenetics, granulosa, maternal inheritance, oocyte, ovary, Polycomb, polycystic ovary syndrome, PRC1, PRC2, primary ovarian insufficiency.
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