1. PGC-1α senses the CBC of pre-mRNA to dictate the fate of promoter-proximally paused RNAPII.
- Author
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Rambout X, Cho H, Blanc R, Lyu Q, Miano JM, Chakkalakal JV, Nelson GM, Yalamanchili HK, Adelman K, and Maquat LE
- Subjects
- Animals, Mice, DNA-Binding Proteins genetics, Muscle, Skeletal metabolism, Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha genetics, Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha metabolism, Promoter Regions, Genetic, RNA Cap-Binding Proteins genetics, RNA Polymerase II metabolism, Transcription, Genetic, RNA Precursors metabolism, Transcription Factors metabolism
- Abstract
PGC-1α is well established as a metazoan transcriptional coactivator of cellular adaptation in response to stress. However, the mechanisms by which PGC-1α activates gene transcription are incompletely understood. Here, we report that PGC-1α serves as a scaffold protein that physically and functionally connects the DNA-binding protein estrogen-related receptor α (ERRα), cap-binding protein 80 (CBP80), and Mediator to overcome promoter-proximal pausing of RNAPII and transcriptionally activate stress-response genes. We show that PGC-1α promotes pausing release in a two-arm mechanism (1) by recruiting the positive transcription elongation factor b (P-TEFb) and (2) by outcompeting the premature transcription termination complex Integrator. Using mice homozygous for five amino acid changes in the CBP80-binding motif (CBM) of PGC-1α that destroy CBM function, we show that efficient differentiation of primary myoblasts to myofibers and timely skeletal muscle regeneration after injury require PGC-1α binding to CBP80. Our findings reveal how PGC-1α activates stress-response gene transcription in a previously unanticipated pre-mRNA quality-control pathway., Competing Interests: Declaration of interests K.A. is a member of the Advisory Board of Molecular Cell., (Copyright © 2022 Elsevier Inc. All rights reserved.)
- Published
- 2023
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