Cited by 26Epigenetics and DNA MethylationCancer Cells and MetastasisGenomics and Chromatin Dynamics

Proteomic Analyses Identify a Novel Role for EZH2 in the Initiation of Cancer Cell Drug Tolerance

Pham, Victoria, Pitti, Robert, Tindell, Charles A., Cheung, Tommy K., Masselot, Alexandre, Stephan, Jean-Phillipe, Guler, Gulfem D., Wilson, Catherine +3 more·2020·Journal of Proteome Research

Abstract

Acquisition of drug resistance remains a chief impediment to successful cancer therapy, and we previously described a transient drug-tolerant cancer cell population (DTPs) whose survival is in part dependent on the activities of the histone methyltransferases G9a/EHMT2 and EZH2, the latter being the catalytic component of the polycomb repressive complex 2 (PRC2). Here, we apply multiple proteomic techniques to better understand the role of these histone methyltransferases (HMTs) in the establishment of the DTP state. Proteome-wide comparisons of lysine methylation patterns reveal that DTPs display an increase in methylation on K116 of PRC member Jarid2, an event that helps stabilize and recruit PRC2 to chromatin. We also find that EZH2, in addition to methylating histone H3K27, also can methylate G9a at K185, and that methylated G9a better recruits repressive complexes to chromatin. These complexes are similar to complexes recruited by histone H3 methylated at K9. Finally, a detailed histone post-translational modification (PTM) analysis shows that EZH2, either directly or through its ability to methylate G9a, alters H3K9 methylation in the context of H3 serine 10 phosphorylation, primarily in a cancer cell subpopulation that serves as DTP precursors. We also show that combinations of histone PTMs recruit a different set of complexes to chromatin, shedding light on the temporal mechanisms that contribute to drug tolerance.

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Crossref · 10.1021/acs.jproteome.9b00773

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59 of 59 references verified0 citation errors · 0 not checkable

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  • In lung and breast cancer, including EGFR-mutant NSCLC cells treated with EGFR inhibitors, drug-tolerant persisters show an increase in methylation on K116 of PRC member Jarid2, which helps stabilize and recruit PRC2 to chromatin.

    “In lung and breast cancer, including EGFR-mutant NSCLC cells treated with EGFR inhibitors, drug-tolerant persisters show an increase in methylation on K116 of PRC member Jarid2, which helps stabilize and recruit PRC2 to chromatin, according to proteome-wide comparisons of lysine methylation patterns [86].”
  • EZH2 is emerging as a key player driving the epigenetic changes driving drug tolerance.

    “Other master regulators of core developmental programs, such as enhancer of zeste homologue 2 (EZH2), which is the catalytic subunit of the Polycomb repressive complex 2 (PRC2), are emerging as key players driving the epigenetic changes driving drug tolerance.”

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Authors
Pham, V., Pitti, R., Tindell, C. A., Cheung, T. K., Masselot, A., Stephan, J.-P., Guler, G. D., Wilson, C., Lill, J., Arnott, D., & Classon, M.
Affiliations
Genentech (US)
Corresponding author
  • Arnott, David
  • Classon, Marie
Venue
Journal of Proteome Research
Published
2020-03-11
Volume
19
Issue
4
Pages
1533-1547
ISSN
  • 1535-3893 (ISSN-L)
  • 1535-3907
OpenAlex
W3010902400
Cited by
26
References
59
Citations by year
2026: 2 · 2025: 5 · 2024: 1 · 2023: 6 · 2022: 5 · 2021: 7
FWCI
1.46
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Proteome Research (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Health Sciences › Medicine › Oncology › Cancer Cells and Metastasis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
EZH2, drug tolerance, histone methyltransferase, polycomb repressive complex 2, JARID2, H3K27 methylation, H3K9 methylation, H3S10 phosphorylation, histone modifications, lysine methylation, chemoresistance
MeSH terms
Enhancer of Zeste Homolog 2 Protein, Drug Tolerance, Histones, Methylation, Neoplasms, Proteomics, Polycomb Repressive Complex 2

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