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Eukaryotic Transcription Inhibitors01:52

Eukaryotic Transcription Inhibitors

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Epigenetic Restriction Factors (eRFs) in Virus Infection.

Arunava Roy1, Anandita Ghosh1

  • 1Department of Molecular Medicine, University of South Florida, Tampa, FL 33612, USA.

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Summary

Cells use epigenetic restriction factors (eRFs) to combat viruses by targeting viral chromatin or RNA. Viruses evolve countermeasures, but understanding eRFs offers new antiviral strategies.

Keywords:
ADARHUSH complexIFI16KRAB/KAP1N6 methyl adenosine (m6A)PML-NBepigenetic viral restriction factor (eRF)epitranscriptomicspseudouridine synthases (PUS)viral chromatin

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Area of Science:

  • Cellular and Molecular Biology
  • Virology
  • Epigenetics

Background:

  • Cells possess intrinsic antiviral defense mechanisms called restriction factors (RFs).
  • Epigenetic machinery provides a class of RFs, termed epigenetic restriction factors (eRFs), that restrict viral gene expression.
  • eRFs are categorized by their targets: viral chromatin or viral RNA (epitranscriptome).

Purpose of the Study:

  • To review and classify epigenetic restriction factors (eRFs).
  • To explore the molecular mechanisms, antiviral roles, and viral counter-strategies related to eRFs.
  • To examine the crosstalk between eRFs and future research directions.

Main Methods:

  • Literature review and classification of eRFs.
  • Analysis of molecular mechanisms of eRFs targeting viral chromatin and epitranscriptome.
  • Examination of viral evasion strategies and eRF crosstalk.

Main Results:

  • eRFs are classified into two main categories: those targeting viral chromatin (e.g., PML-NBs, KRAB/KAP1, IFI16, HUSH) and those targeting viral RNA (epitranscriptomic eRFs).
  • Epitranscriptomic eRFs include RNA base editors (ADAR, PUS) and RNA modifiers (m6A writers, readers, erasers).
  • Viruses have evolved mechanisms to counteract eRFs, highlighting an ongoing evolutionary arms race.

Conclusions:

  • eRFs represent a critical layer of host antiviral defense.
  • Understanding the diverse mechanisms and interactions of eRFs is crucial for developing novel antiviral therapies.
  • Future research into epigenetic networks offers potential for new antiviral discoveries.