Pathway candidateNCBI-verifiedprotein-coding

EZH2

enhancer of zeste 2 polycomb repressive complex 2 subunit

NCBI Gene: 2146 Ensembl GeneCards UniProt: Q15910

Pathway candidate — not linked to PFS or PSSD by any record here

EZH2 is in the library because it belongs to the epigenetic regulation family. No study, report or commentary in the corpus names it, so a variant in EZH2 is not, by itself, evidence of anything related to post-drug syndromes.

Gene summary

A protein-coding gene on chromosome 7 (epigenetic regulation). Encodes a member of the Polycomb-group (PcG) family. PcG family members form multimeric protein complexes, which are involved in maintaining the transcriptional repressive state of genes over successive cell generations.

Source: NCBI Gene, accessed 2026-10-07.

Protein reference (UniProt)

Protein: Histone-lysine N-methyltransferase EZH2
Function (excerpt): Catalytic subunit of the PRC2/EED-EZH2 complex, a Polycomb group (PcG) complex that 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 trimethylate 'Lys-27' of histone H3 to form H3K27me1, H3K27me2 and H3K27me3, respectively. Displays a preference for substrates with less methylation, loses activity when progressively more methyl groups are incorporated into H3K27, H3K27me0 > H3K27me1 > H3K27me2. Compared to EZH1-containing complexes, it is more abundant in embryonic stem cells and 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 repression systems. Genes repressed by the PRC2/EED-EZH2 complex include HOXC8, HOXA9, MYT1, CDKN2A and retinoic acid target genes.
Subcellular location: Nucleus.
Tissue specificity: In the ovary, expressed in primordial follicles and oocytes and also in external follicle cells (at protein level). Expressed in many tissues. Overexpressed in numerous tumor types including carcinomas of the breast, colon, larynx, lymphoma and testis.
Associated conditions: Weaver syndrome (WVS).

Source: UniProtKB/Swiss-Prot Q15910, release 2026_03, licensed CC BY 4.0. This is the protein’s normal biology, not evidence about post-drug syndromes; associated conditions are inherited disorders of the gene, not PFS, PSSD or PRSD.

Why its pathway is in the library

Epigenetic persistence is the leading hypothesis for why post-drug syndromes endure after the drug is gone; chromatin regulators are therefore priority candidates in any persistence mechanism.

Written for the whole epigenetic regulation family, not for EZH2 specifically.

Mentioned in 0 corpus records

No corpus record names EZH2 directly yet. It is in the library because it sits in a pathway the corpus tracks (Epigenetic regulation).

Also in epigenetic regulation

All 130 genes

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Gene summary

Source: NCBI Gene, accessed 2026-10-07.

Protein reference (UniProt)

Protein: Histone-lysine N-methyltransferase EZH2
Function (excerpt): Catalytic subunit of the PRC2/EED-EZH2 complex, a Polycomb group (PcG) complex that 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 trimethylate 'Lys-27' of histone H3 to form H3K27me1, H3K27me2 and H3K27me3, respectively. Displays a preference for substrates with less methylation, loses activity when progressively more methyl groups are incorporated into H3K27, H3K27me0 > H3K27me1 > H3K27me2. Compared to EZH1-containing complexes, it is more abundant in embryonic stem cells and 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 repression systems. Genes repressed by the PRC2/EED-EZH2 complex include HOXC8, HOXA9, MYT1, CDKN2A and retinoic acid target genes.
Subcellular location: Nucleus.
Tissue specificity: In the ovary, expressed in primordial follicles and oocytes and also in external follicle cells (at protein level). Expressed in many tissues. Overexpressed in numerous tumor types including carcinomas of the breast, colon, larynx, lymphoma and testis.
Associated conditions: Weaver syndrome (WVS).