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Interdependent genomic binding of BAP1 and MLL4 regulates a subset of gene expression in HCT116

ABSTRACT: Our genomic studies show that ~20% of MLL4 chromatin binding sites overlap with BAP1 binding regions in HCT116 human colon cancer cells. By comparing MLL4 and BAP1 localization in wild type and knockout cells, we show an interdependent genomic binding of MLL4 and BAP1 on MLL4+ BAP1+ enhancers. Profiling of transcriptomes reveals that a small subset of gene expression is co-regulated by MLL4 and BAP1. Together, our findings identify a functional interaction between enhancer H3K4 methyltransferase MLL4 and H2A deubiquitinase.

ORGANISM(S): Homo sapiens

PROVIDER: GSE213564 | GEO | 2022/12/05

REPOSITORIES: GEO

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ASXL1/2 links MLL4 and BAP1 on enhancers

Project description:Histone H3K4 monomethyltransferases MLL3 and MLL4 contain a set of uncharacterized PHD fingers. By structural and biochemical assays, we found a novel function of the PHD2 and PHD3 (PHD2/3) fingers of MLL3 and MLL4, revealing their direct binding to the conserved MBH (MLL binding helix) region of ASXL1/2, components of the Polycomb repressive PR-DUB complex. In mouse embryonic stem cells, we observed that BAP1, the catalytic subunit of the PR-DUB complex, physically interacts with MLL4 in an ASXL1/2 MBH-dependent manner. Genomic studies demonstrate that the ASXL1/2 MBH is required for BAP1 binding on active enhancers and suggest that MLL4 facilitates BAP1 binding on active enhancers through ASXL1/2 MBH.

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