EZH2 - morinlab/LLMPP GitHub Wiki
bibliography: 'morinlab.bib' csl: 'NLM.csl' link-citations: true nocite: | @mottokIntegrativeGenomicAnalysis2019, @morinSomaticMutationsAltering2010, @loveGeneticLandscapeMutations2012
Overview
EZH2 encodes a histone methyltransferase that is a component of the polycomb repressive complex 2 (PRC2). This gene is recurrently mutated in both FL and DLBCL and has a common mutation hot spot (Y646) that affects the SET domain.[@morinSomaticMutationsAltering2010] EZH2 mutations are one of the defining features of the EZB genetic subgroup of DLBCL.[@wrightProbabilisticClassificationTool2020] Although mutations in EZH2 have been described in some BL patients, they are extremely rare in most BL cohorts that have been sequenced.[@loveGeneticLandscapeMutations2012; @thomasGeneticSubgroupsInform2023]
Experimental Evidence
Mutations at the main hotspot and some less common hotspots lead to enhanced methylation by PRC2.[@yapSomaticMutationsEZH22011] A number of small molecule/pharmacologic inhibitors of EZH2 activity have been described.[@garapaty-raoIdentificationEZH2EZH12013; @knutsonSelectiveInhibitionEZH22014] At least one of these, tazemetostat, has shown benefit in FL.[@morinTreatingLymphomaNow2021] Combination therapies including EZH2 inhibitors are also under exploration for DLBCL patients with mutant EZH2.[@scholzeCombinedEZH2Bcl22020]
Relevance tier by entity
Mutation incidence in large patient cohorts (GAMBL reanalysis)
DLBCL
FL
BL
Mutation pattern and selective pressure estimates
EZH2 Hotspots
Chromosome | Coordinate (hg19) | ref>alt | HGVSp |
---|---|---|---|
chr7 | 148508745 | T>C | N640S |
chr7 | 148508740 | A>G | F642L |
chr7 | 148508728 | A>T | Y646N |
chr7 | 148508728 | A>G | Y646H |
chr7 | 148508727 | T>G | Y646S |
chr7 | 148508727 | T>C | Y646C |
chr7 | 148508727 | T>A | Y646F |
chr7 | 148506466 | TG>GC | A682G |
chr7 | 148506467 | G>C | A682G |
chr7 | 148506437 | GC>AA | A692L |
chr7 | 148506437 | G>A | A692V |
include:tables/browser_EZH2.md
Expression
Representative Mutations
BL
Rating
★ ★ ★ ★ ★
All Mutations
BL
[@loveGeneticLandscapeMutations2012]
include:tables/mermaid_EZH2.md