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p38 MAPK signaling regulates recruitment of Ash2L-containing methyltransferase complexes to specific genes during differentiation

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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Figure 1: Muscle-specific genes are trimethylated at H3K4 during myogenesis.
Figure 2: Mef2 interacts with the Ash2L methyltransferase complex.
Figure 3: Ash2L interacts preferentially with phosphorylated Mef2d and Mef2c.
Figure 4: Inhibition of p38 MAPK activity prevents recruitment of Ash2L to the Myog promoter.
Figure 5: Knockdown of Mef2d and Mef2c in C2C12 cells decreases Ash2L at the Myog and Ckm promoters.
Figure 6: Knockdown of Ash2L in C2C12 cells leads to reduced transcription of the Myog and Ckm genes.
Figure 7: Model for the integration of the p38 MAPK signaling pathway with Mef2-dependent recruitment of the Ash2L complex to muscle-specific promoters.

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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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Contributions

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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Correspondence to F Jeffrey Dilworth.

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Supplementary Figures 1–6, Supplementary Table 1 (PDF 518 kb)

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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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