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Related Concept Videos

Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Mutations in Microorganisms

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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Mutations01:35

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...

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Related Experiment Video

Updated: Jun 4, 2026

Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches
09:35

Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches

Published on: April 20, 2021

Bacterial hypermutation: clinical implications.

Anne Jolivet-Gougeon1, Bela Kovacs2, Sandrine Le Gall-David1

  • 1Equipe Microbiologie, UPRES-EA 1254, Pontchaillou Teaching Hospital and Faculté des Sciences Pharmaceutiques et Biologiques, Université de Rennes I, Université Européenne de Bretagne, 2 avenue du Professeur Léon Bernard, 35043 Rennes, France.

Journal of Medical Microbiology
|February 26, 2011
PubMed
Summary
This summary is machine-generated.

Bacterial hypermutation, often caused by DNA mismatch repair (MMR) system defects, accelerates drug resistance. Antibiotics can worsen this by promoting mutations and recombination, necessitating research into new antimicrobial drugs.

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Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Heritable hypermutation in bacteria is primarily linked to defects in the methyl-directed mismatch repair (MMR) system.
  • MMR-deficient bacterial strains show elevated mutation rates and recombination, crucial for developing acquired antibiotic resistance.
  • Antibiotics can inadvertently promote resistance by selecting for resistant strains, facilitating plasmid-mediated recombination, and inducing error-prone DNA repair pathways.

Purpose of the Study:

  • To elucidate the role of the methyl-directed mismatch repair (MMR) system in bacterial hypermutation.
  • To understand how antibiotic use contributes to the evolution of drug resistance in bacteria.
  • To highlight the clinical implications of increased bacterial mutation and recombination rates.

Main Methods:

  • Analysis of MMR-deficient bacterial strains.
  • Investigation of mutation frequency and recombination rates.
  • Assessment of antibiotic-induced DNA repair mechanisms (SOS system, error-prone polymerases).

Main Results:

  • MMR deficiency leads to increased mutation frequency and recombination in bacteria.
  • Antibiotics act as selective agents for resistant strains and can stimulate DNA recombination.
  • Antibiotics can indirectly promote resistance by activating the SOS system and error-prone DNA polymerases.

Conclusions:

  • Alterations in the MMR system are a key driver of bacterial hypermutation and acquired drug resistance.
  • Antibiotic pressure can accelerate the evolution of resistance through various mechanisms, including enhanced mutation and recombination.
  • The development of new antimicrobial agents with low endogenous resistance potential is crucial for effective treatment of bacterial infections.