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Protein EHMT2 PDB 2o8j.png
Available structures
PDB Ortholog search: PDBe RCSB
Aliases EHMT2, BAT8, C6orf30, G9A, GAT8, KMT1C, NG36, euchromatic histone lysine methyltransferase 2
External IDs MGI: 2148922 HomoloGene: 48460 GeneCards: EHMT2
Gene location (Human)
Chromosome 6 (human)
Chr. Chromosome 6 (human)[1]
Chromosome 6 (human)
Genomic location for EHMT2
Genomic location for EHMT2
Band No data available Start 31,879,759 bp[1]
End 31,897,687 bp[1]
RNA expression pattern
PBB GE EHMT2 202326 at fs.png

PBB GE EHMT2 207484 s at fs.png
More reference expression data
Species Human Mouse
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC) Chr 6: 31.88 – 31.9 Mb Chr 6: 34.9 – 34.91 Mb
PubMed search [3] [4]
View/Edit Human View/Edit Mouse

Euchromatic histone-lysine N-methyltransferase 2 (EHMT2), also known as G9a, is a histone methyltransferase that in humans is encoded by the EHMT2 gene.[5][6][7] G9a catalyzes the dimethylation of H3K9 (i.e., histone H3 at lysine residue 9), which is a repressive histone modification.[8]


A cluster of genes, BAT1-BAT5, has been localized in the vicinity of the genes for TNF alpha and TNF beta. This gene is found near this cluster; it was mapped near the gene for C2 within a 120-kb region that included a HSP70 gene pair. These genes are all within the human major histocompatibility complex class III region. This gene was thought to be two different genes, NG36 and G9a, adjacent to each other but a recent publication shows that there is only a single gene. The protein encoded by this gene is thought to be involved in intracellular protein-protein interaction. There are three alternatively spliced transcript variants of this gene but only two are fully described.[7]

G9a and G9a-like protein, another histone-lysine N-methyltransferase, catalyze the dimethylated state of H3K9me2.[8] G9a is an important control mechanism for epigenetic regulation within the nucleus accumbens, particularly during the development of an addiction, since G9a opposes the induction of ΔFosB expression and is suppressed by ΔFosB.[9] G9a exerts opposite effects to that of ΔFosB on drug-related behavior (e.g., self-administration) and synaptic remodeling (e.g., dendritic arborization – the development of additional tree-like dendritic branches and spines) in the nucleus accumbens, and therefore opposes ΔFosB's function as well as increases in its expression.[9]


EHMT2 has been shown to interact with KIAA0515 and the prostate tissue associated homeodomain protein NKX3.1.[10][11]


  1. ^ a b c ENSG00000224143, ENSG00000206376, ENSG00000204371, ENSG00000227333, ENSG00000232045, ENSG00000236759 GRCh38: Ensembl release 89: ENSG00000238134, ENSG00000224143, ENSG00000206376, ENSG00000204371, ENSG00000227333, ENSG00000232045, ENSG00000236759 - Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000013787 - Ensembl, May 2017
  3. ^ "Human PubMed Reference:". 
  4. ^ "Mouse PubMed Reference:". 
  5. ^ Milner CM, Campbell RD (Mar 1993). "The G9a gene in the human major histocompatibility complex encodes a novel protein containing ankyrin-like repeats". The Biochemical Journal. 290 (Pt 3): 811–8. PMC 1132354Freely accessible. PMID 8457211. 
  6. ^ Tachibana M, Sugimoto K, Fukushima T, Shinkai Y (Jul 2001). "Set domain-containing protein, G9a, is a novel lysine-preferring mammalian histone methyltransferase with hyperactivity and specific selectivity to lysines 9 and 27 of histone H3". The Journal of Biological Chemistry. 276 (27): 25309–17. PMID 11316813. doi:10.1074/jbc.M101914200. 
  7. ^ a b "Entrez Gene: EHMT2 euchromatic histone-lysine N-methyltransferase 2". 
  8. ^ a b Nestler EJ (August 2015). "Role of the Brain's Reward Circuitry in Depression: Transcriptional Mechanisms". Int. Rev. Neurobiol. 124: 151–170. PMC 4690450Freely accessible. PMID 26472529. doi:10.1016/bs.irn.2015.07.003. Chronic social defeat stress decreases expression of G9a and GLP (G9a-like protein), two histone methyltransferases that catalyze the dimethylation of Lys9 of histone H3 (H3K9me2) (Covington et al., 2011), a mark associated with gene repression. 
  9. ^ a b Nestler EJ (January 2014). "Epigenetic mechanisms of drug addiction". Neuropharmacology. 76 Pt B: 259–268. PMC 3766384Freely accessible. PMID 23643695. doi:10.1016/j.neuropharm.2013.04.004. Short-term increases in histone acetylation generally promote behavioral responses to the drugs, while sustained increases oppose cocaine’s effects, based on the actions of systemic or intra-NAc administration of HDAC inhibitors. ... Genetic or pharmacological blockade of G9a in the NAc potentiates behavioral responses to cocaine and opiates, whereas increasing G9a function exerts the opposite effect (Maze et al., 2010; Sun et al., 2012a). Such drug-induced downregulation of G9a and H3K9me2 also sensitizes animals to the deleterious effects of subsequent chronic stress (Covington et al., 2011). Downregulation of G9a increases the dendritic arborization of NAc neurons, and is associated with increased expression of numerous proteins implicated in synaptic function, which directly connects altered G9a/H3K9me2 in the synaptic plasticity associated with addiction (Maze et al., 2010).
    G9a appears to be a critical control point for epigenetic regulation in NAc, as we know it functions in two negative feedback loops. It opposes the induction of ΔFosB, a long-lasting transcription factor important for drug addiction (Robison and Nestler, 2011), while ΔFosB in turn suppresses G9a expression (Maze et al., 2010; Sun et al., 2012a). ... Also, G9a is induced in NAc upon prolonged HDAC inhibition, which explains the paradoxical attenuation of cocaine’s behavioral effects seen under these conditions, as noted above (Kennedy et al., 2013). GABAA receptor subunit genes are among those that are controlled by this feedback loop. Thus, chronic cocaine, or prolonged HDAC inhibition, induces several GABAA receptor subunits in NAc, which is associated with increased frequency of inhibitory postsynaptic currents (IPSCs). In striking contrast, combined exposure to cocaine and HDAC inhibition, which triggers the induction of G9a and increased global levels of H3K9me2, leads to blockade of GABAA receptor and IPSC regulation.
  10. ^ Rual JF, Venkatesan K, Hao T, Hirozane-Kishikawa T, Dricot A, Li N, Berriz GF, Gibbons FD, Dreze M, Ayivi-Guedehoussou N, Klitgord N, Simon C, Boxem M, Milstein S, Rosenberg J, Goldberg DS, Zhang LV, Wong SL, Franklin G, Li S, Albala JS, Lim J, Fraughton C, Llamosas E, Cevik S, Bex C, Lamesch P, Sikorski RS, Vandenhaute J, Zoghbi HY, Smolyar A, Bosak S, Sequerra R, Doucette-Stamm L, Cusick ME, Hill DE, Roth FP, Vidal M (Oct 2005). "Towards a proteome-scale map of the human protein-protein interaction network". Nature. 437 (7062): 1173–8. PMID 16189514. doi:10.1038/nature04209. 
  11. ^ Dutta A, et al. (Jun 2016). "Identification of an NKX3.1-G9a-UTY transcriptional regulatory network that controls prostate differentiation". Science. 

Further reading[edit]