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Background:The Fe-S helicase FANCJ implicated in Fanconi anemia plays important roles in DNA replication and repair. Results: FANCJ, but not the Fe-S XPD or DDX11 helicases, unwinds unimolecular G4 DNA. Conclusion: FANCJ is a specialized Fe-S helicase, preventing G4-induced DNA damage. Significance: FANCJ has a unique role in DNA metabolism to prevent G4 accumulation that causes genomic instability.

Background: Mitochondrial DNA deletions are prominent in human genetic disorders and cancer. Results: Predicted mitochondrial G-quadruplex-forming sequences map in close proximity to known deletion breakpoints and form G-quadruplexes in vitro. Conclusion:The mitochondrial replicative helicase Twinkle inefficiently unwinds intra-and intermolecular G-quadruplexes. Significance: Mitochondrial G-quadruplexes are likely to cause genome instability by perturbing replication machinery.

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