组织表达
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In the ovary, expressed in primordial follicles and oocytes and also in external follicle cells (at protein level)
(PubMed:31451685). Expressed in many tissues (PubMed:14532106) Overexpressed in numerous tumor types including
carcinomas of the breast, colon, larynx, lymphoma and testis (PubMed:14532106)
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功能
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Polycomb group (PcG) protein. subunit of the PRC2/EED-EZH2 complex, which methylates 'Lys-9' (H3K9me) and 'Lys-27'
(H3K27me) of histone H3, leading to transcriptional repression of the affected target gene. Able to mono-, di- and trimethyla
te 'Lys-27' of histone H3 to form H3K27me1, H3K27me2 and H3K27me3, respectively. Displays a preference for substrates with le
ss methylation, loses activity when progressively more methyl groups are incorporated into H3K27, H3K27me0 > H3K27me1 >
me2 (PubMed:22323599, PubMed:30923826). to EZH1-containing complexes, it is more abundant in embryonic stem cells an
d plays a major role in forming H3K27me3, which is required for embryonic stem cell identity and proper differentiation. The
PRC2/EED-EZH2 complex may also serve as a recruiting platform for DNA methyltransferases, thereby linking two epigenetic repr
ession systems. Genes repressed by the PRC2/ complex include HOXC8, HOXA9, MYT1, CDKN2A and retinoic acid target gene
s. EZH2 can also methylate non-histone proteins such as the transcription factor GATA4 and the nuclear receptor RORA. Regulat
es the circadian clock via histone methylation at the promoter of the circadian genes. Essential for the CRY1/2-mediated repr
ession of the transcriptional activation of PER1/2 by the CLOCK-ARNTL/BMAL1 heterodimer; involved in the di and trimethylatio
n of 'Lys-27' of histone H3 on PER1/2 promoters which is necessary for the CRY1/2 proteins to inhibit transcription
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