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Related Experiment Video

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RadD Contributes to R-Loop Avoidance in Sub-MIC Tobramycin.

Veronica Negro1,2, Evelyne Krin1, Sebastian Aguilar Pierlé1

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This summary is machine-generated.

Sub-lethal antibiotic concentrations cause DNA breaks in bacteria lacking RadD. Overexpressing RNase H1 prevents these breaks, revealing a new bacterial stress response mechanism.

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DNA repairR-loopantibiotic resistance

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Sub-inhibitory antibiotic concentrations can drive bacterial evolution and resistance.
  • Understanding bacterial responses to low-level antibiotic stress is crucial for combating resistance.

Purpose of the Study:

  • To investigate the molecular mechanisms by which RadD (VC1636) functions in bacterial stress response.
  • To identify RadD's partners and its role in DNA damage induced by sub-lethal aminoglycoside antibiotics.

Main Methods:

  • Genetic characterization of *Vibrio cholerae* and *Escherichia coli* mutants.
  • High-throughput screening to identify RadD interacting partners and pathways.
  • Analysis of DNA double-strand breaks (DSBs) formation and R-loop accumulation.

Main Results:

  • Absence of RadD leads to DNA double-strand breaks (DSBs) under sub-lethal tobramycin treatment.
  • RNase H1 overexpression rescues DSB formation in *radD* mutants.
  • Loss of RNase H1 or EF-P is lethal in *radD* deletion mutants, suggesting R-loop involvement.

Conclusions:

  • Aminoglycoside antibiotics at sub-lethal levels can induce R-loops, leading to DNA breaks.
  • RadD acts to prevent R-loop accumulation and subsequent DNA damage.
  • This study elucidates a novel bacterial DNA damage response pathway linked to translation-transcription uncoupling.