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Author Spotlight: Characterizing DNA Replication of Pathogenic Repeats to Uncover Mechanisms of Replication Fork Stalling and Expansion
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RNA phase transitions in repeat expansion disorders.

Ankur Jain1,2, Ronald D Vale1,2

  • 1Department of Cellular and Molecular Pharmacology and Howard Hughes Medical Institute, University of California, San Francisco, California 94158, USA.

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|June 1, 2017
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This summary is machine-generated.

Repeat expansions in RNA cause neurological diseases by forming nuclear foci. This study reveals RNA gelation as a key mechanism driving foci formation above a critical repeat number.

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Area of Science:

  • Molecular Biology
  • Neuroscience
  • Genetics

Background:

  • Expansions of short nucleotide repeats are linked to neurological disorders like Huntington's disease and ALS.
  • A hallmark of these diseases is the formation of aberrant RNA foci within the cell nucleus.

Purpose of the Study:

  • To elucidate the molecular mechanism behind RNA foci formation above a critical repeat number.
  • To investigate the role of RNA gelation in the pathogenesis of repeat expansion neurological disorders.

Main Methods:

  • In vitro studies using purified RNA to observe sol-gel transitions.
  • Cellular experiments in human cells to analyze RNA foci formation and dissolution.
  • Investigating the impact of agents that disrupt RNA gelation.

Main Results:

  • Repeat expansions create RNA templates that undergo a sol-gel transition at a critical repeat number.
  • RNA foci form via phase separation driven by repeat-containing RNA.
  • Disrupting RNA gelation in vitro dissolved RNA foci in human cells.

Conclusions:

  • RNA sequence-specific gelation is a potential contributing factor to neurological diseases caused by repeat expansions.
  • This mechanism offers a new perspective on the molecular pathology of these disorders, similar to protein aggregation diseases.