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Effects of antimutagens on prophage induction in E coli lysogenic for lambda
Environmental Mutagenesis
|January 1, 1983
Summary
This study investigated how caffeine, acriflavine, spermine, quinacrine, and adenosine affect prophage induction in Escherichia coli. Different chemicals showed varied effects on spontaneous and UV-induced prophage, highlighting differential impacts on DNA repair mechanisms.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Lysogenic bacteria, such as Escherichia coli, harbor prophages that can be induced to enter the lytic cycle.
- DNA repair mechanisms play a crucial role in bacterial survival and prophage induction.
- Understanding the effects of various chemical agents on prophage induction is vital for comprehending bacterial stress responses and phage-host interactions.
Purpose of the Study:
- To investigate the impact of caffeine, acriflavine, spermine, quinacrine, and adenosine on spontaneous and UV-induced prophage induction.
- To compare these effects in repair-proficient and repair-deficient strains of lysogenic Escherichia coli.
- To elucidate the role of specific DNA repair pathways in modulating the response to these chemical agents.
Main Methods:
- Utilized lysogenic Escherichia coli strains, including repair-proficient (KMBL 160) and repair-deficient mutants (KMBL 161, KMBL 163, KMBL 164).
- Administered caffeine, acriflavine, spermine, quinacrine, and adenosine to bacterial cultures.
- Quantified spontaneous and UV-induced prophage induction levels under various treatment conditions.
Main Results:
- Caffeine exhibited co-inducing effects in proficient and uvrA strains, but anti-inducing effects in uvrE strains.
- Acriflavine increased UV induction in proficient strains while decreasing it in repair-deficient strains, and reduced spontaneous induction across all strains.
- Spermine, quinacrine, and adenosine demonstrated varied effects on spontaneous and UV-induced prophage induction, often differing between proficient and deficient strains, suggesting complex interactions with DNA repair pathways.
Conclusions:
- The tested chemicals differentially modulate prophage induction in Escherichia coli, with effects varying based on the chemical agent and the bacterial strain's repair proficiency.
- Results indicate that DNA repair pathways significantly influence the response to chemical induction of prophage.
- This study provides insights into the mechanisms underlying chemical-mediated prophage induction and bacterial DNA repair.