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Gene Expression is Co-regulated by Non-nucleolar RNA Polymerase I [Hi-C]

ABSTRACT: Due to its role in mRNA synthesis, many studies of the relationship between transcription and chromatin organization have focused on the regulation of RNA polymerase II (Pol-II) function by supranucleosomal structure and vice-versa. In contrast, there is little work on the function of RNA polymerase I (Pol-I) in non-nucleolar chromatin. Prior work has shown that Pol-I engages with components of Pol-II on rDNA, but it’s role in global transcription and chromatin structure beyond the nucleolus has largely been ignored. By pairing auxin-inducible degron technology with nanoscopic imaging, RNA-Seq, and Hi-C, we found that Pol-I and Pol-II co-regulate conformationally defined chromatin domains and mRNA synthesis. Mechanistically, Pol-I maintains the positioning of intronic and intergenic chromatin within domains for the proper expression of exon elements. Consequently, Pol-I loss disrupts genome connectivity, in situ chromatin domains, and the expression of mRNA, genome-wide.

ORGANISM(S): Homo sapiens

PROVIDER: GSE279166 | GEO | 2024/12/01

REPOSITORIES: GEO

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