Abstract
Cell-specific patterns of gene expression are established through the antagonistic functions of trithorax group (TrxG) and Polycomb group (PcG) proteins. Several muscle-specific genes have previously been shown to be epigenetically marked for repression by PcG proteins in muscle progenitor cells. Here we demonstrate that these developmentally regulated genes become epigenetically marked for gene expression (trimethylated on histone H3 Lys4, H3K4me3) during muscle differentiation through specific recruitment of Ash2L-containing methyltransferase complexes. Targeting of Ash2L to specific genes is mediated by the transcriptional regulator Mef2d. Furthermore, this interaction is modulated during differentiation through activation of the p38 MAPK signaling pathway via phosphorylation of Mef2d. Thus, we provide evidence that signaling pathways regulate the targeting of TrxG-mediated epigenetic modifications at specific promoters during cellular differentiation.
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Acknowledgements
This work was supported by grants from the Canadian Institutes of Health Research, the Muscular Dystrophy Association and the Stem Cell Network (to F.J.D.), from the US National Institutes of Health (to S.J.T.) and from the Terry Fox Foundation of the National Cancer Institute of Canada and the Human Frontiers Science Program (to M.B.). F.J.D. holds a Canadian Research Chair in Epigenetic Regulation of Transcription.
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S.R. and F.J.D. conceived and designed the experiments. S.R. was responsible for all ChIP, immunoprecipitation, RT-PCR and interaction studies. F.J.D. and M.B. generated the polyclonal antibody to full-length Ash2L. L.L. generated the polyclonal antibodies to full-length DPY and MyoD. E.M. generated the Mef2D mutant. S.R. and E.M. performed the transfection studies with the Mef2 mutants. K.G. provided antibodies to MLL3 and MLL4. S.R., M.B., S.J.T. and F.J.D. provided scientific direction of the project. F.J.D. wrote the paper. S.R., M.B. and F.J.D. discussed and commented on the manuscript.
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Rampalli, S., Li, L., Mak, E. et al. p38 MAPK signaling regulates recruitment of Ash2L-containing methyltransferase complexes to specific genes during differentiation. Nat Struct Mol Biol 14, 1150–1156 (2007). https://doi.org/10.1038/nsmb1316
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DOI: https://doi.org/10.1038/nsmb1316
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