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Title: Mutation allele burden remains unchanged in chronic myelomonocytic leukaemia responding to hypomethylating agents

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms10767· OSTI ID:1246362
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  1. INSERM U1170, Villejuif (France); Gustave Roussy Cancer Center, Villejuif (France)
  2. INSERM U1170, Villejuif (France); Gustave Roussy Cancer Center, Villejuif (France); INSERM US23, Villejuif (France)
  3. Univ. of Michigan Medical School, Ann Arbor, MI (United States)
  4. Kyoto Univ., Kyoto (Japan)
  5. Univ. Lyon 1, UMR CNRS 5558, Univ. Claude Bernard, Lyon (France)
  6. Centre Leon Berard, INSERM U1052, CNRS UMR5286, Lyon (France)
  7. Hopital Saint-Louis, Paris (France)
  8. Hopital Avicenne, Bobigny (France)
  9. Cancer Research Institute de Lille, INSERM U837, Lille (France)
  10. INSERM U1040, Univ. de Montpellier, Montpellier (France)
  11. Centre Hospitalier Univ. de Nimes, Univ. Montpellier-Nimes, Nimes (France)
  12. INSERM US23, Villejuif (France)
  13. Kinghor Center for Clinical Genomics, Garvan Institute of Medical Research, Darlinghurst New South Wales (Australia)
  14. Centre National de Genotypage, Evry (France)
  15. Wellcome Trust Sanger Institute, Cambridgeshire (United Kingdom)
  16. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Wellcome Trust Sanger Institute, Cambridgeshire (United Kingdom)
  17. H. Lee Moffitt Cancer Center, Tampa, FL (United States)
  18. Gustave Roussy Cancer Center, Villejuif (France)
  19. INSERM U1170, Villejuif (France); Gustave Roussy Cancer Center, Villejuif (France); Univ. Paris-Sud, Le Kremlin-Bicetre (France)

The cytidine analogues azacytidine and 5-aza-2’-deoxycytidine (decitabine) are commonly used to treat myelodysplastic syndromes, with or without a myeloproliferative component. It remains unclear whether the response to these hypomethylating agents results from a cytotoxic or an epigenetic effect. In this study, we address this question in chronic myelomonocytic leukaemia. We describe a comprehensive analysis of the mutational landscape of these tumours, combining whole-exome and whole-genome sequencing. We identify an average of 14 ± 5 somatic mutations in coding sequences of sorted monocyte DNA and the signatures of three mutational processes. Serial sequencing demonstrates that the response to hypomethylating agents is associated with changes in DNA methylation and gene expression, without any decrease in the mutation allele burden, nor prevention of new genetic alteration occurence. Lastly, our findings indicate that cytosine analogues restore a balanced haematopoiesis without decreasing the size of the mutated clone, arguing for a predominantly epigenetic effect.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1246362
Report Number(s):
LA-UR-15-24070; ncomms10767
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 148 works
Citation information provided by
Web of Science

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Cited By (44)

Advances in chronic myelomonocytic leukemia and future prospects: Lessons learned from precision genomics journal January 2019
Chronic myelomonocytic leukemia: 2018 update on diagnosis, risk stratification and management journal May 2018
Suboptimal response rates to hypomethylating agent therapy in chronic myelomonocytic leukemia; a single institutional study of 121 patients journal May 2019
Chronic Myelomonocytic leukemia: 2020 update on diagnosis, risk stratification and management journal October 2019
5-Azacytidine modulates CpG methylation levels of EZH2 and NOTCH1 in myelodysplastic syndromes journal September 2019
Cancer stem cells modulate patterns and processes of evolution in cancers journal May 2018
Number and type of TET2 mutations in chronic myelomonocytic leukemia and their clinical relevance journal September 2016
Dynamic changes in the clonal structure of MDS and AML in response to epigenetic therapy journal October 2016
Clonal evolution in myelodysplastic syndromes journal April 2017
Dynamics of clonal evolution in myelodysplastic syndromes journal December 2016
Ongoing clonal evolution in chronic myelomonocytic leukemia on hypomethylating agents: a computational perspective journal March 2018
Blast-phase chronic myelomonocytic leukemia: more than just semantics journal August 2018
Downregulating Notch counteracts KrasG12D-induced ERK activation and oxidative phosphorylation in myeloproliferative neoplasm journal September 2018
Biology and prognostic impact of clonal plasmacytoid dendritic cells in chronic myelomonocytic leukemia journal March 2019
EZH2 mutations in chronic myelomonocytic leukemia cluster with ASXL1 mutations and their co-occurrence is prognostically detrimental journal January 2018
Infrequent occurrence of TET1, TET3, and ASXL2 mutations in myelodysplastic/myeloproliferative neoplasms journal March 2018
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Comprehensive mutation profiling and mRNA expression analysis in atypical chronic myeloid leukemia in comparison with chronic myelomonocytic leukemia journal January 2019
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