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PHF3 regulates neuronal gene expression through the new Pol II CTD reader domain SPOC

Item Type:Preprint
Title:PHF3 regulates neuronal gene expression through the new Pol II CTD reader domain SPOC
Creators Name:Appel, L.M. and Franke, V. and Bruno, M. and Grishkovskaya, I. and Kasiliauskaite, A. and Schoeberl, U.E. and Puchinger, M.G. and Kostrhon, S. and Beltzung, E. and Mechtler, K. and Lin, G. and Vlasova, A. and Leeb, M. and Pavri, R. and Stark, A. and Akalin, A. and Stefl, R. and Bernecky, C. and Djinovic-Carugo, K. and Slade, D.
Abstract:The C-terminal domain (CTD) of the largest subunit of RNA polymerase II (Pol II) is a regulatory hub for transcription and RNA processing. Here, we identify PHD-finger protein 3 (PHF3) as a new CTD-binding factor that negatively regulates transcription and mRNA stability. The PHF3 SPOC domain preferentially binds to CTD repeats phosphorylated on Serine-2 and PHF3 tracks with Pol II across the length of genes. PHF3 competes with TFIIS for Pol II binding through its TFIIS-like domain (TLD), thus inhibiting TFIIS-mediated rescue of backtracked Pol II. PHF3 knock-out or PHF3 SPOC deletion in human cells result in gene upregulation and a global increase in mRNA stability, with marked derepression of neuronal genes. Key neuronal genes are aberrantly expressed in Phf3 knock-out mouse embryonic stem cells, resulting in impaired neuronal differentiation. Our data suggest that PHF3 is a prominent effector of neuronal gene regulation at the interface of transcription elongation and mRNA decay.
Source:bioRxiv
Publisher:Cold Spring Harbor Laboratory Press
Article Number:2020.02.11.943159
Date:12 February 2020
Official Publication:https://doi.org/10.1101/2020.02.11.943159

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