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VID22 counteracts G-quadruplex-induced genome instability.

Elena Galati1, Maria C Bosio1, Daniele Novarina1

  • 1Department of Biosciences, Università degli Studi di Milano, Via Celoria 26, 20133 Milan, Italy.

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Scientists discovered VID22 protects DNA at G-quadruplexes, crucial for genome stability. Loss of VID22 leads to DNA damage and aberrations, highlighting its role in preventing cancer progression.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Genome instability is a key characteristic of cancer cells, involving accumulated genetic alterations.
  • Understanding endogenous DNA damage and genome integrity pathways is crucial for cancer research.

Purpose of the Study:

  • To identify novel genes and cellular pathways involved in maintaining genome integrity.
  • To investigate the function of the VID22 gene in DNA repair and genome stability.

Main Methods:

  • Utilized a Synthetic Genetic Array (SGA)-based screen in yeast to identify genes affecting genome integrity.
  • Performed in vitro and in vivo experiments to assess Vid22's DNA binding and protective capabilities.
  • Analyzed DNA aberrations, chromosomal rearrangements, and telomere/mtDNA maintenance in vid22Δ cells.

Main Results:

  • Identified VID22 as a gene involved in DNA double-strand break repair and genome integrity.
  • vid22Δ cells show increased endogenous DNA damage, chronic DNA damage response, and DNA aberrations, particularly in G-quadruplex (G4-DNA) forming regions.
  • Vid22 binds to and protects DNA at G4 regions, and its absence increases G-quadruplex-dependent chromosomal rearrangements.
  • Loss of VID22 impairs maintenance of G4-DNA rich elements like telomeres and mtDNA, causing hypersensitivity to G4 ligands.

Conclusions:

  • Vid22 directly contributes to genome integrity maintenance.
  • Vid22 acts as a novel regulator of G-quadruplex (G4-DNA) metabolism, protecting against DNA damage and aberrations.
  • The findings suggest Vid22's critical role in preventing genome instability and potentially cancer development.