Abstract
The polycomb repressive complex 2 (PRC2) consists of three core components EZH2, SUZ12 and EED. EZH2 catalyzes the methylation of lysine 27 of histone H3, a modification associated with gene silencing. Through gene duplication higher vertebrate genomes also encode a second partially redundant methyltransferase, EZH1. Within the mammalian immune system most research has concentrated on EZH2 which is expressed predominantly in proliferating cells. EZH2 and other PRC2 components are required for hematopoietic stem cell function and lymphocyte development, at least in part by repressing cell cycle inhibitors. At later stages of immune cell differentiation, EZH2 plays essential roles in humoral and cell-mediated adaptive immunity, as well as the maintenance of immune homeostasis. EZH2 is often overactive in cancers, through both gain-of-function mutations and over-expression, an observation that has led to the development and clinical testing of specific EZH2 inhibitors. Such inhibitors may also be of use in inflammatory and autoimmune settings, as EZH2 inhibition dampens the immune response. Here, we will review the current state of understanding of the roles for EZH2, and PRC2 more generally, in the development and function of the immune system.
Acknowledgments
This work was supported by grants and fellowships from the National Health and Medical Research Council of Australia (1049307, 1125436, 1155342, Funder Id: http://dx.doi.org/10.13039/501100000925) and an American Asthma Foundation Senior Award.
Conflict of interest statement: The authors declare no commercial or financial conflict of interest.
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