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Updated: Sep 11, 2025

A Murine Cell Line Based Model of Chronic CDK9 Inhibition to Study Widespread Non-Genetic Transcriptional Elongation Defects TEdeff in Cancers
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RNA Pol II inhibition activates cell death independently from the loss of transcription.

Nicholas W Harper1, Gavin A Birdsall1, Megan E Honeywell1

  • 1Department of Systems Biology, UMass Chan Medical School, Worcester, MA 01605, USA.

Cell
|August 16, 2025
PubMed
Summary

Loss of RNA Pol IIA triggers apoptosis, not gene dysregulation, leading to cell death. This discovery reveals a novel apoptotic pathway (PDAR) and its role in anti-cancer drug efficacy.

Keywords:
BCL2L12DNA damagePTBP1RNA polymerase IIapoptosiscancer therapycell deathchemotherapycisplatintranscription

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • RNA Pol II-mediated transcription is vital for eukaryotic cells.
  • Mechanisms of cell death upon transcription loss remain unclear.
  • Previous assumptions linked cell death to gene expression dysregulation.

Purpose of the Study:

  • To elucidate the mechanisms of cell death following RNA Pol II activity loss.
  • To identify the specific form of RNA Pol II responsible for cell death.
  • To uncover the role of this cell death pathway in anti-cancer therapy.

Main Methods:

  • Functional genomics screens to identify genetic dependencies.
  • Analysis of RNA Pol IIA (hypophosphorylated Rbp1) loss.
  • Viability assays with transcriptionally inactive Rpb1 expression.
  • Drug screening based on identified PDAR dependencies.

Main Results:

  • Cell death upon RNA Pol II loss is independent of gene expression changes.
  • Loss of hypophosphorylated Rbp1 (RNA Pol IIA) specifically activates apoptosis.
  • A novel pathway, Pol II degradation-dependent apoptotic response (PDAR), was identified.
  • Clinically used drugs were found to exert lethality via PDAR.

Conclusions:

  • Cell death upon RNA Pol II loss is mediated by apoptosis, not gene dysregulation.
  • RNA Pol IIA loss triggers the PDAR pathway, leading to cell death.
  • PDAR is a critical mechanism underlying the efficacy of various anti-cancer therapies.