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Mutations in Microorganisms01:18

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Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
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Stress-induced Antibiotic Susceptibility Testing on a Chip
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Antimicrobials, stress and mutagenesis.

Alexandro Rodríguez-Rojas1, Olga Makarova1, Jens Rolff1

  • 1Evolutionary Biology, Institute for Biology, Free University Berlin, Berlin, Germany.

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Cationic antimicrobial peptides (AMPs) do not increase bacterial mutation rates or trigger stress responses, unlike antibiotics. This suggests AMPs are a safer evolutionary strategy for multicellular organisms to combat microbes without promoting resistance.

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Area of Science:

  • Evolutionary biology
  • Microbiology
  • Immunology

Background:

  • Cationic antimicrobial peptides (AMPs) are key immune effectors in multicellular organisms, primarily targeting microbial cell walls.
  • The evolutionary stability of AMPs was questioned due to observed resistance, despite their proposed 'Achilles heel' mechanism.
  • Antibiotics, mainly produced by microorganisms, can increase bacterial mutation rates by activating stress pathways.

Purpose of the Study:

  • To investigate why cationic antimicrobial peptides (AMPs) are widespread in multicellular organisms.
  • To compare the effects of AMPs and antibiotics on bacterial mutation rates and stress responses.
  • To offer a new perspective on the evolutionary success of AMPs and their implications for antimicrobial resistance.

Main Methods:

  • Studied five antimicrobial peptides from vertebrates and insects.
  • Utilized a Luria-Delbrück fluctuation assay to assess bacterial mutation rates.
  • Employed rtPCR and disc diffusion assays to detect SOS and rpoS bacterial stress pathway activation.

Main Results:

  • Cationic antimicrobial peptides (AMPs) did not increase bacterial mutation rates.
  • AMPs did not elicit SOS or rpoS bacterial stress pathways.
  • This contrasts with antibiotics, which elevate mutagenesis via these pathways.

Conclusions:

  • AMPs offer an evolutionary advantage to multicellular organisms by not fueling bacterial adaptation and resistance.
  • Findings provide a new perspective on the evolutionary success of AMPs and their role in innate immunity.
  • This research has significant implications for understanding host-microbe interactions, antimicrobial resistance, and therapeutic AMP development.