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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Regulation of RNA Polymerase I Stability and Function.

Stephanie Pitts1, Marikki Laiho1,2

  • 1Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

Cancers
|December 11, 2022
PubMed
Summary

RNA polymerase I (Pol I) drives rRNA synthesis essential for cell growth. Cancers exploit Pol I, creating a vulnerability that researchers are targeting with specific chemical biology agents.

Keywords:
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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cancer Therapeutics

Background:

  • RNA polymerase I (Pol I) is crucial for synthesizing ribosomal RNA (rRNA), a process vital for ribosome biogenesis and cell proliferation.
  • Pol I exhibits high processivity, rapid initiation, and elongation rates, enabling efficient rRNA production.
  • Cancer cells hijack Pol I transcription control to sustain high proliferation rates.

Purpose of the Study:

  • To review the current understanding of RNA polymerase I transcription regulation.
  • To discuss chemical biology approaches for developing targeted Pol I inhibitors.
  • To highlight challenges and successes in creating specific Pol I-targeting agents.

Main Methods:

  • Literature review of research on Pol I transcription regulation.
  • Analysis of chemical biology efforts and drug development strategies targeting Pol I.
  • Evaluation of agent specificity and selectivity in preclinical and clinical studies.

Main Results:

  • Pol I transcription is tightly regulated, but cancer cells aberrantly activate it.
  • Targeting Pol I offers a potential therapeutic vulnerability for cancer treatment.
  • Development of targeted agents faces challenges due to promiscuous mechanisms but shows promise with specific compounds.

Conclusions:

  • Dysregulated Pol I transcription is a hallmark of cancer, presenting a viable therapeutic target.
  • Chemical biology is advancing the development of specific inhibitors against Pol I.
  • Future efforts should focus on agents with high specificity and selectivity for effective cancer therapy.