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- W4293585637 abstract "Abstract Changes in gene expression programs are intimately linked to cell fate decisions. Post-translational modifications of core histones contribute to control gene expression. Methylation of lysine 4 of histone H3 (H3K4) correlates with active promoters and gene transcription. This modification is catalyzed by KMT2 methyltransferases, which require interaction with 4 core subunits, WDR5, RBBP5, ASH2L and DPY30, for catalytic activity. Ash2l is necessary for organismal development and for tissue homeostasis. In mouse embryo fibroblasts (MEFs), Ash2l loss results in gene repression, provoking a senescence phenotype. We now find that upon knockout of Ash2l both H3K4 mono- and tri-methylation (H3K4me1 and me3, respectively) were deregulated. In particular, loss of H3K4me3 at promoters correlated with gene repression, especially at CpG island promoters. Ash2l loss resulted in increased loading of histone H3 and chromatin compaction at promoters, accompanied by an increase of repressing and a decrease of activating histone marks. Moreover, we observed altered binding of CTCF upon Ash2l loss. Lost and gained binding was noticed at promoter-associated and intergenic sites, respectively. Thus, Ash2l loss and reduction of H3K4me3 correlate with chromatin compaction and altered transcription factor binding. These findings contribute to a more detailed understanding of mechanistic consequences of H3K4me3 loss and associated repression of gene repression and thus of the observed cellular consequences." @default.
- W4293585637 created "2022-08-30" @default.
- W4293585637 creator A5014695058 @default.
- W4293585637 creator A5041462448 @default.
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- W4293585637 creator A5090315796 @default.
- W4293585637 date "2022-08-30" @default.
- W4293585637 modified "2023-09-27" @default.
- W4293585637 title "Loss of the Ash2l subunit of histone H3K4 methyltransferase complexes promotes chromatin compaction at promoters" @default.
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