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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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It Takes Two to Make a Thing Go Right: Epistasis, Two-Component Response Systems, and Bacterial Adaptation.

Brittany R Sanders1, Lauren S Thomas1, Naya M Lewis1

  • 1Department of Biology, North Carolina Agricultural and Technical State University, Greensboro, NC 27411, USA.

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|October 26, 2024
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Epistasis significantly enhances bacterial adaptation to silver stress in Escherichia coli. Interactions between mutations in regulatory genes create varied resistance strategies, highlighting the complexity of microbial evolution.

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bacterial adaptationepistasisgene-by-environment interactionssilver resistancetwo-component response systems

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Area of Science:

  • Evolutionary Biology
  • Microbial Genetics
  • Bacterial Adaptation

Background:

  • Understanding genotype-fitness interplay is key in evolutionary biology.
  • Microbial adaptation to environmental stressors involves complex genetic mechanisms.
  • Two-component response systems (TCRS) play a role in bacterial stress response.

Purpose of the Study:

  • To explore the role of epistasis in bacterial adaptation to silver stress.
  • To examine genetic and phenotypic changes in silver-adapted Escherichia coli.
  • To investigate how mutations in regulatory genes influence silver resistance.

Main Methods:

  • Conducted 24-hour growth assays.
  • Performed whole-genome DNA and RNA sequencing on E. coli mutants.
  • Focused on the R15L cusS mutation and its interactions with other genes (ompR, rho, fur).

Main Results:

  • The R15L cusS mutation is central to silver resistance by upregulating the cus efflux system.
  • Epistatic interactions with mutations in ompR, rho, and fur significantly enhance the effectiveness of the cusS mutation.
  • These interactions reconfigure global stress response networks, leading to diverse resistance strategies.

Conclusions:

  • Epistasis plays a critical role in shaping bacterial resistance phenotypes.
  • Genetic background and mutation interactions are crucial for adaptation.
  • Adaptation is a complex, context-dependent process influenced by genetic and environmental factors, with implications for antimicrobial resistance.