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Dynamics of MBD2 deposition across methylated DNA regions during malignant transformation of human mammary epithelial cells

DNA methylation is thought to induce transcriptional silencing through the combination of two mechanisms: the repulsion of transcriptional activators unable to bind their target sites when methylated, and the recruitment of transcriptional repressors with specific affinity for methylated DNA. The Me...

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Published in:Nucleic acids research 2015-07, Vol.43 (12), p.5838-5854
Main Authors: Devailly, Guillaume, Grandin, Mélodie, Perriaud, Laury, Mathot, Pauline, Delcros, Jean-Guy, Bidet, Yannick, Morel, Anne-Pierre, Bignon, Jean-Yves, Puisieux, Alain, Mehlen, Patrick, Dante, Robert
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cited_by cdi_FETCH-LOGICAL-c412t-4ce018a07af502d3973bc7d414476bc1b063c77cf512d7fa12a6eb66745e59fb3
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container_issue 12
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container_title Nucleic acids research
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creator Devailly, Guillaume
Grandin, Mélodie
Perriaud, Laury
Mathot, Pauline
Delcros, Jean-Guy
Bidet, Yannick
Morel, Anne-Pierre
Bignon, Jean-Yves
Puisieux, Alain
Mehlen, Patrick
Dante, Robert
description DNA methylation is thought to induce transcriptional silencing through the combination of two mechanisms: the repulsion of transcriptional activators unable to bind their target sites when methylated, and the recruitment of transcriptional repressors with specific affinity for methylated DNA. The Methyl CpG Binding Domain proteins MeCP2, MBD1 and MBD2 belong to the latter category. Here, we present MBD2 ChIPseq data obtained from the endogenous MBD2 in an isogenic cellular model of oncogenic transformation of human mammary cells. In immortalized (HMEC-hTERT) or transformed (HMLER) cells, MBD2 was found in a large proportion of methylated regions and associated with transcriptional silencing. A redistribution of MBD2 on methylated DNA occurred during oncogenic transformation, frequently independently of local DNA methylation changes. Genes downregulated during HMEC-hTERT transformation preferentially gained MBD2 on their promoter. Furthermore, depletion of MBD2 induced an upregulation of MBD2-bound genes methylated at their promoter regions, in HMLER cells. Among the 3,160 genes downregulated in transformed cells, 380 genes were methylated at their promoter regions in both cell lines, specifically associated by MBD2 in HMLER cells, and upregulated upon MBD2 depletion in HMLER. The transcriptional MBD2-dependent downregulation occurring during oncogenic transformation was also observed in two additional models of mammary cell transformation. Thus, the dynamics of MBD2 deposition across methylated DNA regions was associated with the oncogenic transformation of human mammary cells.
doi_str_mv 10.1093/nar/gkv508
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source Oxford Academic Journals (OUP); PubMed Central
subjects Binding Sites
Breast - cytology
Cell Line
Cell Line, Transformed
Cell Transformation, Neoplastic - genetics
DNA Methylation
DNA-Binding Proteins - metabolism
Down-Regulation
Epithelial Cells - metabolism
Female
Gene regulation, Chromatin and Epigenetics
Homeodomain Proteins - metabolism
Humans
Life Sciences
Phenotype
Repressor Proteins - metabolism
Telomerase - genetics
Transcription Factors - metabolism
Tumor Suppressor Protein p53 - antagonists & inhibitors
Zinc Finger E-box-Binding Homeobox 1
title Dynamics of MBD2 deposition across methylated DNA regions during malignant transformation of human mammary epithelial cells
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