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Updated: Jul 3, 2025

Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
Published on: April 29, 2010
NELF coordinates Pol II transcription termination and DNA replication initiation.
Colorectal tumors show increased NELF-C gene expression. Loss of NELF-C disrupts RNA polymerase II transcription termination and elongation, potentially causing transcription-replication conflicts and impacting cell cycle progression.
Area of Science:
- Molecular Biology
- Cancer Research
- Genetics
Background:
- RNA polymerase II (Pol II) transcription regulation is vital for cell proliferation, but its alterations in cancer remain unclear.
- The role of NELF-C, a negative elongation factor, in cancer-driven transcription changes needs further investigation.
Approach:
- Utilized an auxin-dependent protein degradation system to acutely deplete NELF-C in colorectal cancer models.
- Employed nascent transcript sequencing technologies to analyze global Pol II transcription dynamics.
- Investigated the direct impact of NELF-C loss on transcription termination, elongation, and cell cycle progression.
Key Points:
- NELF-C gene expression is upregulated in colorectal tumors.
- Acute NELF-C loss globally perturbs Pol II transcription termination and increases elongation rate, independent of promoter-proximal pausing.
- NELF-C is essential for the G1-S phase transition in the cell cycle.
Conclusions:
- NELF-C loss causes Pol II to transcribe into DNA replication initiation zones, potentially leading to cell cycle arrest.
- NELF-C and its role in transcription-replication conflict present a potential therapeutic target for colorectal cancer treatment.
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