Cited by 308Genomics and Chromatin DynamicsEpigenetics and DNA MethylationTelomeres, Telomerase, and Senescence

Independence of Repressive Histone Marks and Chromatin Compaction during Senescent Heterochromatic Layer Formation

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Chandra, Tamir, Kirschner, Kristina, Thuret, Jean-Yves, Pope, Benjamin D., Ryba, Tyrone, Newman, Scott, Ahmed, Kashif, Samarajiwa, Shamith A. +21 more·2012·Molecular Cell

Abstract

The expansion of repressive epigenetic marks has been implicated in heterochromatin formation during embryonic development, but the general applicability of this mechanism is unclear. Here we show that nuclear rearrangement of repressive histone marks H3K9me3 and H3K27me3 into nonoverlapping structural layers characterizes senescence-associated heterochromatic foci (SAHF) formation in human fibroblasts. However, the global landscape of these repressive marks remains unchanged upon SAHF formation, suggesting that in somatic cells, heterochromatin can be formed through the spatial repositioning of pre-existing repressively marked histones. This model is reinforced by the correlation of presenescent replication timing with both the subsequent layered structure of SAHFs and the global landscape of the repressive marks, allowing us to integrate microscopic and genomic information. Furthermore, modulation of SAHF structure does not affect the occupancy of these repressive marks, nor vice versa. These experiments reveal that high-order heterochromatin formation and epigenetic remodeling of the genome can be discrete events.

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Crossref · 10.1016/j.molcel.2012.06.010

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  • Senescence-associated heterochromatin foci are organized heterochromatic domains detected as dense DAPI-positive nuclear structures enriched in repressive marks and proteins including H3K9me3, HP1, HMGA factors, macroH2A, HIRA and ASF1A.

    “Senescence-associated heterochromatin foci (SAHF) are spatially organized heterochromatic domains that can be detected as dense 4′,6-diamidino-2-phenylindole (DAPI)-positive nuclear structures that are enriched in repressive chromatin marks and proteins, including trimethylated histone H3 Lys9 (H3K9me3), heterochromatin protein 1 (HP1), high mobility group protein A (HMGA) factors, histone variant”

    From Cellular senescence in ageing: from mechanisms to therapeutic opportunities (2021) · cites this paper as [51]

    The Introduction describes SAHFs as DAPI-dense foci, and the Results (‘Multilayer Structure of Chromatin in SAHFs’; page not provided) show spatially organized H3K9me3-rich regions containing HP1γ. The paper also identifies HMGA1 as a structural component. Our copy does not establish enrichment of macroH2A, HIRA, or ASF1A in SAHFs; searches for those terms found no supporting passages. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Heterochromatin incorporated into SAHF results from redistribution of pre-existing repressive heterochromatin marks rather than newly formed heterochromatin on genomic regions.

    “Heterochromatin incorporated into SAHF results from the redistribution of pre-existing repressive heterochromatin marks rather than newly formed heterochromatin on genomic regions [167,253,278,279].”

    From Mechanisms and Regulation of Cellular Senescence (2021) · cites this paper as [278]

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Authors
Chandra, T., Kirschner, K., Thuret, J.-Y., Pope, B. D., Ryba, T., Newman, S., Ahmed, K., Samarajiwa, S. A., Salama, R., Carroll, T., Stark, R., Janky, R., Narita, M., Xue, L., Chicas, A., Nũnez, S., Janknecht, R., Hayashi-Takanaka, Y., Wilson, M. D., Marshall, A., Odom, D. T., Babu, M. M., Bazett-Jones, D. P., Tavaré, S., Edwards, P. A. W., Lowe, S. W., Kimura, H., Gilbert, D. M., & Narita, M.
Affiliations
  • University of Cambridge (GB)
  • Cancer Research UK (GB)
  • Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
  • Florida State University (US)
  • Hospital for Sick Children (CA)
  • MRC Laboratory of Molecular Biology (GB)
  • Memorial Sloan Kettering Cancer Center (US)
  • University of Oklahoma Health Sciences Center (US)
  • The University of Osaka (JP)
Corresponding author
Narita, Masashi
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2012-07
Volume
47
Issue
2
Pages
203-214
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2153643905
Cited by
308
References
63
Citations by year
2026: 10 · 2025: 11 · 2024: 28 · 2023: 17 · 2022: 20 · 2021: 23 · 2020: 29 · 2019: 19 · 2018: 24 · 2017: 19 · 2016: 22 · 2015: 28 · 2014: 26 · 2013: 27 · 2012: 5
FWCI
11.06
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Cold Spring Harbor Laboratory Institutional Repository (Cold Spring Harbor Laboratory) (submittedVersion)
  • Institutional Repositories DataBase (IRDB) (submittedVersion)
  • Tokyo Tech Research Repository (Tokyo Institute of Technology) (submittedVersion)
Funders
  • Cancer Research UK (14545, 19556, 15890, 15603, A15603)
  • Canadian Institutes of Health Research
  • Japan Society for the Promotion of Science (22370063)
  • National Institute on Aging (R01AG016379)
  • National Cancer Institute (P30CA008748)
  • National Institute of General Medical Sciences (GM083337, P01GM085354, GM085354, R01GM083337)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
Keywords
heterochromatin formation, H3K9me3, H3K27me3, chromatin condensation, epigenetic remodeling, DNA replication timing, fibroblast senescence, histone occupancy
MeSH terms
Bromodeoxyuridine, Chromatin, Chromosomes, Fibroblasts, Heterochromatin, Histones, Humans, Microscopy, Fluorescence, Genome, Cellular Senescence, Gene Expression Regulation, Developmental, Gene Silencing, Epigenesis, Genetic, Laser Scanning Cytometry, Genome-Wide Association Study

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