Genetic analysis of epistasis between nucleotide excision repair and homologous recombination in the recovery of persisters after fluoroquinolone treatment.

Disruption of key DNA repair genes recA and uvrD significantly impairs fluoroquinolone persister recovery in Escherichia coli, highlighting their crucial roles in DNA repair mechanisms.

• Why it matters: Understanding how bacteria survive antibiotic treatment is vital for developing strategies to combat persistent infections, especially since persisters can withstand antibiotics by repairing DNA damage rather than avoiding it.
• What they did: The study involved deleting DNA repair enzymes such as uvrA, uvrB, mfd, recB, and recC in stationary-phase E. coli and analyzing their epistatic interactions with recA and uvrD, focusing on their roles in persister recovery after fluoroquinolone exposure.
• The result: Findings show that RecA's recombination activity and UvrD's helicase function are essential for persister recovery, revealing nuanced interactions between homologous recombination and nucleotide excision repair pathways that could inform new antimicrobial strategies.