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Title: Partially methylated domains are hypervariable in breast cancer and fuel widespread CpG island hypermethylation

Journal Article · · Nature Communications
ORCiD logo [1];  [2];  [1];  [3];  [3];  [4];  [5]; ORCiD logo [5];  [5];  [5];  [5];  [5]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [3];  [7];  [8]; ORCiD logo [9];  [10];  [11] more »;  [12];  [13];  [14];  [7];  [11]; ORCiD logo [3];  [3]; ORCiD logo [5]; ORCiD logo [1] « less
  1. Radboud Univ., Nijmegen (Netherlands). Radboud Inst. for Molecular Life Sciences. Faculty of Science. Dept. of Molecular Biology
  2. Wellcome Trust Sange Inst., Cambridge (United Kingdom); Univ. of Cambridge (United Kingdom). Academic Dept. of Medical Genetics
  3. Erasmus Univ. Medical Center, Rotterdam (Netherlands). Erasmus MC Cancer Inst. and Cancer Genomics Netherlands
  4. Wellcome Trust Sange Inst., Cambridge (United Kingdom); Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Biology and Biophysics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Nonlinear Studies
  5. Wellcome Trust Sange Inst., Cambridge (United Kingdom)
  6. Lund Univ. (Sweden). Dept. of Clinical Sciences Lund. Division of Oncology and Pathology
  7. Centre Léon Bérard, Lyon (France). Synergie Lyon Cancer
  8. Wellcome Trust Genome Campus, Hinxton (United Kingdom). European Bioinformatics Inst. European Molecular Biology Lab.
  9. The Norwegian Radium Hospital (Norway). Oslo Univ. Hospital. Inst. for Cancer Research. Dept. of Genetics
  10. The Norwegian Radium Hospital (Norway). Oslo Univ. Hospital. Inst. for Cancer Research. Dept. of Genetics; Univ. of Oslo (Norway). Inst. for Clinical medicine. K.G. Jebsen Centre for Breast Cancer Research; Akerhus Univ. Hospital, Lørenskog (Norway). Division of Medicine. Dept. of Clinical moelcular Biology and Lab. Science (EpiGen)
  11. Parc Cientific de Barcelona (Spain). Centro nacional de Análisis Genómico (CNAG)
  12. Academic Medical Center, Amsterdam (Netherlands). Dept. of Pathology
  13. The Norwegian Radium Hospital (Norway). Oslo Univ. Hospital. Inst. for Cancer Research. Dept. of Genetics; Univ. of Oslo (Norway). Inst. for Clinical medicine. K.G. Jebsen Centre for Breast Cancer Research
  14. Brigham and Women's Hospital (Harvard Medical School), Boston, MA (United States). Dept. of Pathology; Dana-Farber Cancer Institute, Boston, MA (United States)

Global loss of DNA methylation and CpG island (CGI) hypermethylation are key epigenomic aberrations in cancer. Global loss manifests itself in partially methylated domains (PMDs) which extend up to megabases. However, the distribution of PMDs within and between tumor types, and their effects on key functional genomic elements including CGIs are poorly defined. We comprehensively show that loss of methylation in PMDs occurs in a large fraction of the genome and represents the prime source of DNA methylation variation. PMDs are hypervariable in methylation level, size and distribution, and display elevated mutation rates. They impose intermediate DNA methylation levels incognizant of functional genomic elements including CGIs, underpinning a CGI methylator phenotype (CIMP). Repression effects on tumor suppressor genes are negligible as they are generally excluded from PMDs. The genomic distribution of PMDs reports tissue-of-origin and may represent tissue-specific silent regions which tolerate instability at the epigenetic, transcriptomic and genetic level.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1624152
Journal Information:
Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

DNA methylation loss promotes immune evasion of tumours with high mutation and copy number load journal September 2019
Comprehensive evaluation of methods to assess overall and cell-specific immune infiltrates in breast cancer journal December 2019
Random forest-based modelling to detect biomarkers for prostate cancer progression journal October 2019
Determining subpopulation methylation profiles from bisulfite sequencing data of heterogeneous samples using DXM journal June 2021

Figures / Tables (4)


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