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H3K4me3 instructs transcription at intergenic active regulatory elements

Yu, H.; Zhang, Y.; Liao, Z.; Walters, B. W.; Lesch, B. J.

2025-03-22 genetics
10.1101/2025.03.21.644682 bioRxiv
Show abstract

Mammalian genomes undergo pervasive transcription in both genic and intergenic regions. Tri-methylation of histone H3 lysine 4 (H3K4me3) is a deeply conserved and functionally important histone modification enriched at transcriptionally active promoters, where it facilitates RNA polymerase activity. H3K4me3 is also commonly found in intergenic regions, where its role is poorly understood. We interrogated the role of H3K4me3 at intergenic regulatory elements by using epigenetic editing to efficiently deposit H3K4me3 at intergenic loci. We find that H3K4me3 instructs RNA polymerase activity and is actively remodeled at intergenic regions, shedding light on these important but poorly understood regions of the genome.

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