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G-quadruplexes regulate chromatin accessibility and gene expression in Bloom Syndrome.

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Bloom Syndrome (BS) involves genome instability due to BLM gene mutations. Unresolved DNA G-quadruplexes (G4s) in BS cells increase chromatin accessibility and gene expression, contributing to disease.

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Area of Science:

  • Genetics and Molecular Biology
  • Genomic Instability Research
  • DNA Structure and Function

Background:

  • Bloom Syndrome (BS) is a genetic disorder marked by hyper-recombination and genomic instability.
  • Mutations in the BLM gene, encoding a RecQ helicase, cause BS.
  • DNA G-quadruplexes (G4s) are structures with regulatory roles in gene expression and chromatin organization.

Purpose of the Study:

  • To investigate alterations in G4 profiles in Bloom Syndrome.
  • To determine the contribution of G4s to BS-associated molecular changes.
  • To elucidate the role of BLM helicase in G4 resolution and its impact on genome stability.

Main Methods:

  • Chromatin accessibility profiling using ATAC-seq.
  • Gene expression analysis using RNA-seq.
  • Mapping of endogenous G4 structures via ChIP-seq in wild-type and BS cell lines.

Main Results:

  • BS cell lines showed differential G4 formation correlating with altered chromatin accessibility and gene expression.
  • G4 stabilization in wild-type cells partially mimicked BS molecular phenotypes.
  • Regions with increased chromatin accessibility in BS were enriched for G4 sequences.

Conclusions:

  • G4 structures play a significant regulatory role in Bloom Syndrome.
  • Unresolved G4s in BLM-deficient cells enhance chromatin accessibility, promoting gene expression.
  • BLM's function extends to regulating G4 structures, highlighting their role in BS etiology.