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• W4386572810 abstract "Abstract The trithorax protein ASH2L is essential for organismal and tissue development. As a subunit of COMPASS/KMT2 complexes, ASH2L is necessary for methylation of histone H3 lysine 4 (H3K4). Mono- and trimethylation at this site mark active enhancers and promoters, respectively, although the molecular relevance of H3K4 methylation is only partially understood. Due to the importance of ASH2L in all 6 COMPASS-like complexes and its long half-life, it has been difficult to define direct consequences. To overcome this limitation, we employed a PROTAC system, which allows the rapid degradation of ASH2L and addressing direct effects. Loss of ASH2L resulted in rapid inhibition of proliferation of mouse embryo fibroblasts. Shortly after ASH2L degradation, H3K4me3 decreased with its half-life revealing considerable variability between promoters. Subsequently, H3K4me1 increased at promoters and decreased at some enhancers. H3K27ac and H3K27me3, histone marks closely linked to H3K4 methylation, were affected with considerable delay. In parallel, chromatin compaction increased at promoters. Of note, nascent gene transcription was not affected early but overall RNA expression was deregulated late after ASH2L loss. Together, these findings suggest that downstream effects are ordered but relatively slow, despite the rapid loss of ASH2L and inactivation of KMT2 complexes. It appears that the systems that control gene transcription are well buffered and strong effects are only beginning to unfold after considerable delay." @default.
• W4386572810 created "2023-09-10" @default.
• W4386572810 creator A5014695058 @default.
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• W4386572810 creator A5090315796 @default.
• W4386572810 date "2023-09-08" @default.
• W4386572810 modified "2023-10-14" @default.
• W4386572810 title "Sequential deregulation of histone marks, chromatin accessibility and gene expression in response to PROTAC-induced degradation of ASH2L" @default.
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• W4386572810 doi "https://doi.org/10.1101/2023.09.08.556832" @default.
• W4386572810 hasPublicationYear "2023" @default.
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