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Molecular Mechanisms Directing PRC2 Recruitment and H3K27 Methylation
Open accessAbstract
The polycomb repressive complex 2 (PRC2) is a chromatin-associated methyltransferase catalyzing mono-, di-, and trimethylation of lysine 27 on histone H3 (H3K27). This activity is required for normal organismal development and maintenance of gene expression patterns to uphold cell identity. PRC2 function is often deregulated in disease and is a promising candidate for therapeutic targeting in cancer. In this review, we discuss the molecular mechanisms proposed to take part in modulating PRC2 recruitment and shaping H3K27 methylation patterns across the genome. This includes consideration of factors influencing PRC2 residence time on chromatin and PRC2 catalytic activity with a focus on the mechanisms giving rise to regional preferences and differential deposition of H3K27 methylation. We further discuss existing evidence for functional diversity between distinct subsets of PRC2 complexes with the aim of extracting key concepts and highlighting major open questions toward a more complete understanding of PRC2 function.
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“Within the Polycomb Repressive Complex 2 (PRC2), EZH2 serves as the catalytic subunit responsible for depositing the repressive H3K27me3 mark and silencing target genes (Blackledge et al., 2020; Laugesen et al., 2019).”
From Histone modifications and depression: epigenetic mechanisms, therapeutic targets, and translational outlook (2026) · cites this paper as Laugesen et al., 2019
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“This is reminiscent of mammalian systems where PRC2 is recruited to GC-rich regions by DNA-binding proteins that have an affinity for low-complexity GC-rich motifs or CpG dinucleotides (Mendenhall et al. 2010; Wachter et al. 2014; Laugesen et al. 2019).”
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Epigenetic and Metabolic Changes in Diffuse Intrinsic Pontine Glioma
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“This modification is associated with a repressed chromatin state, which inhibits the expression of genes in that region of the genome [27].”
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“The previously observed kinetics of H3K27me3 formation (approximately 36 hours), at least in pluripotent cells, also do not support a role for this modification in restricting lytic HSV-1 infection (67, 68).”
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“In addition,Marcinkiewicz et al. (7, 8) found that SUZ12, H3K27me3 and H3K9me3 were recruited in non-tumorigenic human OKF6-TERT1R compared with tumorigenic SCC-9 cells and concluded that altered PRC2 activity was associated with dysregulated HOXC10 expression in human oral squamous cell carcinoma.”
BackgroundInfluentialThe tumor suppressor MIR139 is silenced by POLR2M to promote AML oncogenesis
Stavast, C. J., van Zuijen, I., Karkoulia, E., Özçelik, A., van Hoven-Beijen, A., León, L. G., Voerman, J. S. A., Janssen, G. M. C., van Veelen, P. A., Burócziová, M., et al. (2021) · Leukemia · doi:10.1038/s41375-021-01461-5 · Cited by 17
“One class of PcG proteins, polycomb repressive complex 2 (PRC2), consists of the methyltransferase EZH2 or EZH1, EED, SUZ12, and RBBP4 [20].”
BackgroundDynamical modeling of the H3K27 epigenetic landscape in mouse embryonic stem cells
Newar, K., Abdulla, A. Z., Salari, H., Fanchon, É., & Jost, D. (2022) · PLoS Computational Biology · doi:10.1371/journal.pcbi.1010450 · Cited by 16
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BackgroundEZH2 can be used as a therapeutic agent for inhibiting endothelial dysfunction
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“24,25 EZH2 is the catalytic subunit of PRC2.”
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BackgroundSynergistic antitumor effect of combined EZH2 and DOT1L inhibition in B-cell lymphoma
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BackgroundExploring oncogenic roles and clinical significance of EZH2: focus on non-canonical activities
Woźniak, M., & Czyż, M. (2025) · Therapeutic Advances in Medical Oncology · doi:10.1177/17588359241306026 · Cited by 19
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The Common LncRNAs of Neuroinflammation-Related Diseases
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“PRC2 is a polymer composed of EZH1, EZH2, embryonic ectoderm development, and other subunits (Laugesen et al., 2019).”
BackgroundH2A Ubiquitination Alters H3-tail Dynamics on Linker-DNA to Enhance H3K27 Methylation
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“It is suggested those EMF2b-binding sites without H3K27me3 may be pre-nucle-ation sites for PRC2-mediated H3K27me3 deposition [48, 49].”
BackgroundPolycomb repressor complex: Its function in human cancer and therapeutic target strategy
Liu, J., Fan, H., Liang, X., & Chen, Y. (2023) · Biomedicine & Pharmacotherapy · doi:10.1016/j.biopha.2023.115897 · Cited by 17
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“The polycomb repressive complex 2 (PRC2) methyltransferase acts preferentially towards H3K27 to methylate H3K27me1 (monomethylation), H3K27me2 (dimethylation) and H3K27me3 (trimethylation) (150, 151).”
The interplay between histone modifications and nuclear lamina in genome regulation
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“Histone modifications are critical epigenetic regulators that specify the transcriptome during lineage determination and tightly control transcriptional states to preserve cellular identity over cell generations (Laugesen et al. 2019).”
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“…groups to the cytosine of CpG dinucleotides, and is associated with numerous biological processes including the regulation of gene expression, silencing of transposable elements, genomic imprinting, and X-chromosome inactivation (Disteche and Berletch, 2015; Elhamamsy, 2017; Li and Zhang, 2014).”
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“High levels of H3K27me3 are associated with inactive enhancers and the body of repressed genes (Laugesen et al., 2019; Piunti and Shilatifard, 2021).”
BackgroundInfluentialTDP-43 Epigenetic Facets and Their Neurodegenerative Implications
Gimenez, J., Spalloni, A., Cappelli, S., Ciaiola, F., Orlando, V., Buratti, E., & Longone, P. (2023) · International Journal of Molecular Sciences · doi:10.3390/ijms241813807 · Cited by 15
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“55,74 Depending on the types of histones and residues, histone methylation affects gene transcription differently by either opening or stabilizing chromatin structure.”
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“Such reader function is important for both the allosteric activation of PRC2 [3] and the expansion of this suppressive marker along the chromatin template [4].”
A conserved switch to less catalytically active Polycomb repressive complexes in non-dividing cells
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“73,76,77 80 Histone acetyl transferases (HATs) are the writer enzymes that deposit acetylation marks, and histone deacetylases (HDACs) are the eraser enzymes.”
Chauhan, R., & Michalak, T. I. (2021) · Hepatoma Research · doi:10.20517/2394-5079.2020.136 · Cited by 14
“In addition, we tracked for CCCTC-binding factor (CTCF) clusters linked to insulator activity, enhancer of zeste homolog 2 (EZH2) sequences playing a main role in methylation by activating methyl groups, and for the presence of DNAase binding regions([93-95]).”
MethodEpigenetic priming as a mechanism of predetermination of spermatogonial stem cell fate
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DOT1L inhibitors block abnormal self-renewal induced by cohesin loss
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“For example, enhancer of zeste homolog 2 (EZH2), a catalytic component of the polycomb repressive complex 2 (PRC2), catalyzes the trimethylation of H3K27, leading to the silencing of tumor suppressor genes and driving cancer progression [ 69].”
Lin, K., Gao, W., Chen, N., Yang, S., Wang, H., Wang, R., Xie, F., Meng, J., Lam, E. W. ‐., Ma, C., et al. (2022) · International Journal of Biological Sciences · doi:10.7150/ijbs.73749 · Cited by 13
“EZH2 is a crucial subunit of the PRC2 and catalyzes H3K27me2/3, which are linked to transcriptional silence [23, 45].”
BackgroundCheung, C. H. Y., Cheng, C., Leung, K. T., Zhang, C., Ho, C. Y., Luo, X., Kam, A. Y. F., Xia, T., Wan, T. S. K., Pitts, H. A., et al. (2024) · Blood Advances · doi:10.1182/bloodadvances.2023010218 · Cited by 13
The eroding chromatin landscape of aging stem cells
Shi, C., Wang, L., & Sen, P. (2020) · Translational Medicine of Aging · doi:10.1016/j.tma.2020.08.002 · Cited by 14
Higashijima, Y., Nagai, N., Yamamoto, M., Kitazawa, T., Kawamura, Y., Taguchi, A., Nakada, N., Nangaku, M., Furukawa, T., Aburatani, H., et al. (2020) · Communications Biology · doi:10.1038/s42003-020-01456-5 · Cited by 13
Simpson, K. E., Heumen, G. C.-V., Watson, K. L. M., Roth, M., Martin, C., & Moorehead, R. A. (2021) · Cancer Cell International · doi:10.1186/s12935-021-01784-4 · Cited by 14
Ezh2 harnesses the intranuclear actin cytoskeleton to remodel chromatin in differentiating Th cells
Titelbaum, M., Brant, B., Baumel, D., Burstein-Willensky, A., Perez, S., Barsheshet, Y., & Avni, O. (2021) · iScience · doi:10.1016/j.isci.2021.103093 · Cited by 13
“Ezh2 is histone methyltransferase that preferentially trimethylates histone H3 on lysine 27 (H3K27me3), but additional targets were demonstrated (Laugesen et al., 2019; Margueron and Reinberg, 2010; Schuettengruber et al., 2007), and PcG proteins entail non-catalytic activities as well (Muller and Verrijzer, 2009; Pie…”
BackgroundAP-1 Mediates Cellular Adaptation and Memory Formation During Therapy ResistancePreprint
Li, J., Ravindran, P. T., O’Farrell, A., Busch, G. T., Boe, R. H., Niu, Z., Woo, S., Dunagin, M. C., Jain, N., Goyal, Y., et al. (2024) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.1101/2024.07.25.604999 · Cited by 13
“In those cases, enzymes that read and write such modifications are the key to their epigenetic propagation, such as SUV39H1/2 40 and PRC2 41–43 , respectively.”
BackgroundWang, L., Yi, J., Chen, H., Wang, P., & Shen, Y. (2021) · The Kaohsiung Journal of Medical Sciences · doi:10.1002/kjm2.12356 · Cited by 14
“The maintenance and catalysis of DNA methylation is conducted by DNMTs.26 DNMT1 and DNMT3 are the two main members of DNMTs. DNMT1 maintains the methylation through DNA replication and repair, while DNMT3 catalyzes the de novo methylation of CpGs.27 In general, DNMTs regulate the transcription of the target genes and…”
BackgroundChan, N. T., Huang, J., Ma, G., Zeng, H., Donahue, K., Wang, Y., Li, L., & Xu, W. (2022) · Nucleic Acids Research · doi:10.1093/nar/gkac047 · Cited by 12
“Emerging evidence has shown that the active histone marks inhibit PRC2 activity in transcribed regions (67) and that both H3K4me3 and H3K36me2/3 are inhibitory to PRC2 activity (68,69).”
Fritsche, K., Boccellato, F., Schlaermann, P., Koeppel, M., Denecke, C., Link, A., Malfertheiner, P., Gut, I., Meyer, T. F., & Berger, H. (2022) · Clinical Epigenetics · doi:10.1186/s13148-022-01406-4 · Cited by 12
“EZH2 is the functional enzymatic subunit of the polycomb repressive complex 2 (PRC2), which catalyzes the methylation of lysine 27 of histone 3 (H3K27), leading to transcriptional repression [32].”
BackgroundControllers of histone methylation-modifying enzymes in gastrointestinal cancers
Li, L., Song, Q., Zhou, J., & Ji, Q. (2024) · Biomedicine & Pharmacotherapy · doi:10.1016/j.biopha.2024.116488 · Cited by 13
Guo, Y., Huang, J., Meng, L., Yin, Q., Zhang, T., Guo, Z., Tang, Y., Cheng, R., Wang, Y., Peng, Y., et al. (2025) · Journal of Translational Internal Medicine · doi:10.1515/jtim-2025-0020 · Cited by 12
Han, Y., Wei, Y., Yao, J., Chu, Y., Li, C.-W., Hsu, J. L., Nie, L., & Hung, M. (2020) · PubMed Central · Cited by 12
Brown, K., Andrianakos, H., Ingersoll, S., & Ren, X. (2021) · Nucleic Acids Research · doi:10.1093/nar/gkab304 · Cited by 14
“PRC2 is the methyltransferase that is responsible for methylation of more than 80% of all histone H3 across the genome (61,66).”
BackgroundInfluentialPR‐DUB safeguards Polycomb repression through H2AK119ub1 restriction
Li, R., Huang, D., Zhao, Y., Yuan, Y., Sun, X., Dai, Z., Huo, D., Liu, X., Helin, K., Li, M. J., et al. (2023) · Cell Proliferation · doi:10.1111/cpr.13457 · Cited by 12
“49,54,55 This sampling module allows PRCs to engage all potential target promoters in the genome while only to achieve stable binding at favourable repressive environment through formation of PcG domain or condensates.”
BackgroundJiao, H., Xie, Y., & Li, Z. (2020) · Biochemical Society Transactions · doi:10.1042/bst20200192 · Cited by 12
Wang, S., Guo, N., Li, S., He, Y. M., Zheng, D., Li, L., & Wang, Z. (2021) · Frontiers in Cardiovascular Medicine · doi:10.3389/fcvm.2021.585691 · Cited by 12
García-Montolio, M., Ballaré, C., Blanco, E., Gutiérrez, A., Aranda, S., Gómez, A., Kok, C. H., Yeung, D. T. O., Hughes, T. P., Vizán, P., et al. (2021) · Frontiers in Cell and Developmental Biology · doi:10.3389/fcell.2021.655201 · Cited by 12
“SUZ12, and EED), several sub-stoichiometric accessory factors have been described to regulate PRC2 genomic localization and function (Vizan et al., 2015; Laugesen et al., 2019).”
BackgroundAjit, K., Alagia, A., Burger, K., & Gullerová, M. (2024) · Genome Research · doi:10.1101/gr.278644.123 · Cited by 12
“However, PRC1 can also be recruited to H3K27me3 marks deposited by PRC2 (Laugesen et al. 2019).”
Yang, L., Zuo, S., Jia, R., Gu, X., Liao, Q., Hua, Y., Ge, S., He, M., Fan, J., Tong, X., et al. (2025) · Cancer Letters · doi:10.1016/j.canlet.2025.217804 · Cited by 11
Emerging roles of histone methylation in phytopathogenic fungi
Zhang, Q., & Zeng, T. (2025) · aBIOTECH · doi:10.1007/s42994-025-00223-6 · Cited by 11
“In animals, PRC2, a histone methyltransferase complex (Laugesen et al. 2019), catalyzes H3K27me1, 2, and 3: H3K27me2 and 3 repress gene expression while H3K27me1 promotes gene expression (Jacob and Michaels 2009; Shen et al. 2008).”
AP-1 mediates cellular adaptation and memory formation
Li, J., Ravindran, P. T., O’Farrell, A., Busch, G. T., Boe, R. H., Niu, Z., Woo, S., Dunagin, M. C., Jain, N., Goyal, Y., et al. (2026) · Nature Communications · doi:10.1038/s41467-026-70862-w · Cited by 23
“In those cases, enzymes that read and write such modi fi cations are the key to their epigenetic propagation, such as SUV39H1/2 50 and PRC2 51 – 53 , respectively.”
De Novo Polycomb Recruitment and Repressive Domain Formation
Hernández-Romero, I. A., & Valdés, V. J. (2022) · Epigenomes · doi:10.3390/epigenomes6030025 · Cited by 11
“The functional core of PRC2 contains the embryonic ectoderm development protein (Eed), the retinoblastoma binding protein (RbAp46/48), Suz12, and Ezh1/2 that are responsible for the catalysis of mono-, di-, and trimethylation of histone H3 lysine 27 (H3K27me1/2/3) [4,84].”
BackgroundInfluentialHuang, L., Li, F., Ye, L., Yu, F., & Wang, C. (2023) · Cell Proliferation · doi:10.1111/cpr.13413 · Cited by 11
ANGPTL2 ‐mediated epigenetic repression of MHC‐I in tumor cells accelerates tumor immune evasion
Kadomatsu, T., Hara, C., Kurahashi, R., Horiguchi, H., Morinaga, J., Miyata, K., Kurano, S., Kanemaru, H., Fukushima, S., Araki, K., et al. (2023) · Molecular Oncology · doi:10.1002/1878-0261.13490 · Cited by 12
“In tRCC cells, Angptl2 or Itg a 5 deficiency did not alter expression levels of Ezh2 , embryonic ectoderm development ( Eed ), and Suz12 , all of which encode core subunits of PRC2 complex [34].”
BackgroundInfluentialThe Role of Long Noncoding RNAs in Intestinal Health and Diseases: A Focus on the Intestinal Barrier
Lu, Q., Liang, Y., Meng, X., Zhao, Y., Fan, H., & Hou, S. (2023) · Biomolecules · doi:10.3390/biom13111674 · Cited by 12
“It interacts with polycomb repressive complex 2 (PRC2), a chromatin-associated methyltransferase that catalyzes the methylation of lysine 27 on histone H3 (H3K27), thus regulating the transcriptional silencing of genes of the HOXD locus and other gene loci [29,30].”
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“Enhancer of zeste homolog 2 (EZH2) is a significant epigenetic protein that silences genes by inducing histone methylation, playing a crucial role in the regulation of gene expression and chromatin remodeling [ 11].”
Astrocyte allocation during brain development is controlled by Tcf4-mediated fate restriction
Zhang, Y., Li, D., Cai, Y., Zou, R., Zhang, Y., Deng, X., Wang, Y., Tang, T., Ma, Y., Wu, F., et al. (2024) · The EMBO Journal · doi:10.1038/s44318-024-00218-x · Cited by 11
“Furthermore, they should state limitation of this study.”
Schulten, A., Jang, G., Payne-Dwyer, A. L., Fiedler, M., Nielsen, M., Mateo‐Bonmatí, E., Bienz, M., Leake, M. C., & Dean, C. (2025) · Molecular Cell · doi:10.1016/j.molcel.2025.08.002 · Cited by 11
“36 Our 37–40 In what has been termed a “responsive model” for targeting Polycomb complexes, Polycomb samples along the chromatin for permissive chromatin states and accumulates at specific sites through positive feedback mechanisms.”
InfluentialSlimVar for rapid in vivo single-molecule tracking of chromatin regulators in plants
Payne-Dwyer, A. L., Jang, G., Dean, C., & Leake, M. C. (2025) · Nature Communications · doi:10.1038/s41467-025-63108-8 · Cited by 11
Zhang, Q., Deng, X., Tang, X., You, Y., Mei, M., Liu, D., Gui, L., Cai, Y., Xin, X., He, X., et al. (2021) · Frontiers in Oncology · doi:10.3389/fonc.2021.737986 · Cited by 11
“Enhancer of zeste homologue 1 (EZH1) is a member of the Polycomb group (PcG) protein family that plays a crucial role in gene silencing (9, 10).”
BackgroundPathania, A. S. (2023) · Cancers · doi:10.3390/cancers15102833 · Cited by 13
“PRC2 catalyzes mono-, di-, and trimethylation of histone H3 at lysine 27 (H3K27me1/2/3), causing chromatin compaction and transcriptional repression [38].”
BackgroundLongbotham, J. E., Zhang, M. Y., & Fujimori, D. G. (2020) · Current Opinion in Chemical Biology · doi:10.1016/j.cbpa.2020.06.001 · Cited by 12
Liu, C., Tóth, R., Bakr, A., Goyal, A., Islam, M. S., Breuer, K., Mayakonda, A., Lin, Y.-Y., Stepper, P., Jurkowski, T. P., et al. (2021) · Cancers · doi:10.3390/cancers13102455 · Cited by 13
“sion, but it can also interact with other proteins to co‐activate PRC2‐independent gene transcription [17,18].”
BackgroundEpigenetic regulation of cancer stem cells: Shedding light on the refractory/relapsed cancers
Xu, L., Zhang, J., Sun, J., Hou, K., Yang, C., Guo, Y., Liu, X., Kalvakolanu, D. V., Zhang, L., & Guo, B. (2022) · Biochemical Pharmacology · doi:10.1016/j.bcp.2022.115110 · Cited by 11
Metadata
- Authors
- Laugesen, A., Højfeldt, J. W., & Helin, K.
- Affiliations
- University of Copenhagen (DK)
- Corresponding author
- Helin, Kristian
- Venue
- Molecular Cell
- Publisher
- Elsevier BV
- Published
- 2019-04
- Volume
- 74
- Issue
- 1
- Pages
- 8-18
- ISSN
- 1097-2765 (ISSN-L)
- PMC
- PMC6452890
- OpenAlex
- W2925415367
- Cited by
- 602
- References
- 105
- Citations by year
- 2026: 60 · 2025: 89 · 2024: 85 · 2023: 83 · 2022: 79 · 2021: 87 · 2020: 83 · 2019: 36
- FWCI
- 6.31
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Molecular Cell (publishedVersion)
- Research at the University of Copenhagen (University of Copenhagen) (publishedVersion, other-oa)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- Danmarks Grundforskningsfond (DNRF 82)
- Novo Nordisk Fonden (NNF16OC0023234)
- National Cancer Institute (P30CA008748)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chromatin Remodeling and Cancer
- Keywords
- polycomb repressive complex 2, H3K27 methylation, histone methyltransferase, gene silencing, cancer therapy targets
- MeSH terms
- Animals, Histones, Humans, Lysine, Methylation, Protein Binding, DNA Methylation, Chromatin Assembly and Disassembly, Polycomb Repressive Complex 2
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