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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • G-quadruplexes (G4s) are stable DNA secondary structures crucial for cellular processes.
  • Timely resolution of G4s is hypothesized to be essential for efficient and accurate DNA replication.
  • The DNA2 nuclease-mediated G4 resolution pathway's biological significance remains largely unknown.

Purpose of the Study:

  • To investigate the biological role of the DNA2-mediated G4 removal pathway.
  • To elucidate the regulatory mechanism of G4 resolution by DNA2.
  • To understand the impact of G4 stabilizers on telomere replication.

Main Methods:

  • Single molecular analysis of replicating DNA (SMARD) to detect G4s and stalled replication forks.
  • Assessing the effects of DNA2 deficiency or inhibition on G4 accumulation and telomere replication.
  • Investigating the interaction between MutSα (MSH2-MSH6) and G4s.
  • Evaluating the impact of G4-stabilizing compounds on DNA2 and helicase activity.

Main Results:

  • DNA2 deficiency or inhibition led to significant G4 accumulation and stalled replication forks at telomeres.
  • The MutSα complex binds G4s and promotes their resolution via DNA2-mediated G4 excision.
  • MSH2 deficiency mirrored DNA2 deficiency effects, causing G4 accumulation and defective telomere replication.
  • G4 stabilizers blocked helicase unwinding but not DNA2 cleavage, impairing telomere replication and causing instability, particularly in DNA2- or MSH2-deficient cells.

Conclusions:

  • DNA2 and MutSα are critical for resolving G-quadruplexes during DNA replication.
  • The DNA2-mediated pathway is essential for preventing G4 accumulation and maintaining telomere replication fidelity.
  • G4 stabilizers pose a significant risk to telomere stability, especially in cells with compromised G4 resolution pathways.