Abstract
DNA methylation, a major biological process regulating the transcription, contributes to the pathophysiology of hematologic malignancies, and hypomethylating agents are commonly used to treat myelodysplastic syndromes (MDS) and acute myeloid leukemias (AML). In these diseases, bone marrow mesenchymal stromal cells (MSCs) play a key supportive role through the production of various signals and interactions. The DNA methylation status of MSCs, likely to reflect their functionality, might be relevant to understand their contribution to the pathophysiology of these diseases. Consequently, the aim of our study was to analyze the modifications of DNA methylation profiles of MSCs induced by MDS or AML. MSCs from MDS/AML patients were characterized via 5-methylcytosine quantification, gene expression profiles of key regulators of DNA methylation, identification of differentially methylated regions (DMRs) by methylome array, and quantification of DMR-coupled genes expression. MDS and AML-MSCs displayed global hypomethylation and under-expression of DNMT1 and UHRF1. Methylome analysis revealed aberrant methylation profiles in all MDS and in a subgroup of AML-MSCs. This aberrant methylation was preferentially found in the sequence of homeobox genes, especially from the HOX family (HOXA1, HOXA4, HOXA5, HOXA9, HOXA10, HOXA11, HOXB5, HOXC4, and HOXC6), and impacted on their expression. These results highlight modifications of DNA methylation in MDS/AML-MSCs, both at global and focal levels dysregulating the expression of HOX genes well known for their involvement in leukemogenesis. Such DNA methylation in MSCs could be the consequence of the malignant disease or could participate in its development through defective functionality or exosomal transfer of HOX transcription factors from MSCs to hematopoietic cells.
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Acknowledgements
The authors acknowledge Philippe Rosset for collecting healthy donors’ samples, Sophie Hamard for the isolation of healthy donors’ MSCs, Lamya Haddaoui, and all the participants of the FILOthèque. This work was supported by the International Rotary Club of Blois and Sapins de l’Espoir Contre le Cancer, CANCEN, and AHB associations. The authors declare no competing financial interests.
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Conduction of experiments and acquisition of data: BR, FP, CD, MK, NG, PH, and AE; material support: MM, MH, EG, and JD; bioinformatics analysis: JM and FP; analysis and interpretation of data: OH, BR, FP, CD, MK, NG, PH, FD, EG, and JD; writing of the article: BR, FP, and OH; editing of the article: MCB; conception, development of methodology, experiment design and performance, study supervision: OH. All the authors reviewed the paper.
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Roux, B., Picou, F., Debeissat, C. et al. Aberrant DNA methylation impacts HOX genes expression in bone marrow mesenchymal stromal cells of myelodysplastic syndromes and de novo acute myeloid leukemia. Cancer Gene Ther 29, 1263–1275 (2022). https://doi.org/10.1038/s41417-022-00441-w
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DOI: https://doi.org/10.1038/s41417-022-00441-w
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