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RecQ helicases function in the maintenance of genome stability in many organisms. The filamentous fungus Neurospora crassa has two RecQ homologs, QDE3 and RECQ2. We found that the qde-3 recQ2 double mutant showed a severe growth defect. The growth defect was alleviated by mutation in mei-3, the homolog of yeast RAD51, which is required for homologous recombination (HR), suggesting that HR is responsible for this phenotype. We also found that the qde-3 recQ2 double mutant showed a mutator phenotype, yielding mostly deletions. This phenotype was completely suppressed by mutation of mus-52, a homolog of the human KU80 gene that is required for nonhomologous end joining (NHEJ), but was unaffected by mutation of mei-3. The high spontaneous mutation frequency in the double mutant is thus likely to be due to NHEJ acting on an elevated frequency of double-strand breaks (DSBs) and we therefore suggest that QDE3 and RECQ2 maintain chromosome stability by suppressing the formation of spontaneous DSBs.

genetics

Growth Defect and Mutator Phenotypes of RecQ-Deficient <i>Neurospora crassa</i> Mutants Separately Result From Homologous Recombination and Nonhomologous End Joining During Repair of DNA Double-Strand Breaks

Growth Defect and Mutator Phenotypes of RecQ-Deficient Neurospora crassa Mutants Separately Result From Homologous Recombination and Nonhomologous End Joining During Repair of DNA Double-Strand Breaks