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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.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Mismatch Repair01:36

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Mismatch Repair01:36

Mismatch Repair

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Nucleotide Excision Repair01:08

Nucleotide Excision Repair

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Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Nucleotide Excision Repair01:08

Nucleotide Excision Repair

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Genetic Studies of Human DNA Repair Proteins Using Yeast as a Model System
14:09

Genetic Studies of Human DNA Repair Proteins Using Yeast as a Model System

Published on: March 18, 2010

DNA repair in Corynebacterium model.

B C Resende1, A B Rebelato, V D'Afonseca

  • 1Laboratório de Genética Molecular, Universidade Federal de São João Del-Rei, CCO, Divinópolis, MG, Brazil.

Gene
|April 19, 2011
PubMed
Summary

DNA repair pathways, particularly nucleotide excision repair (NER), are crucial for maintaining genomic stability in Corynebacterium bacteria. Studying these DNA repair genes offers potential therapeutic targets for controlling infectious diseases.

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Area of Science:

  • Microbiology
  • Genomics
  • Molecular Biology

Background:

  • Corynebacterium species encompass diverse roles, including plant and animal pathogens, yet their genomic stability mechanisms remain poorly understood.
  • Genome sequencing provides insights into the nature, stability, pathogenicity, and virulence of these bacteria.
  • DNA repair is essential for genomic stability, with deficiencies potentially leading to instability and death, making it a target for controlling infectious agents.

Purpose of the Study:

  • To compare DNA repair genes across 15 Corynebacterium genomes (pathogenic and nonpathogenic).
  • To identify conserved DNA repair pathways critical for genomic stability in Corynebacterium.
  • To explore the potential of DNA repair genes as targets for therapeutic intervention.

Main Methods:

  • Comparative genomics analysis of 15 Corynebacterium genomes.
  • Focus on genes involved in various DNA repair pathways: Nucleotide Excision Repair (NER), Recombination Repair (RR), Mismatch Repair (MMR), Base Excision Repair (BER), and Direct Repair.
  • Phylogenetic analysis of specific NER genes (uvrABC).

Main Results:

  • Nucleotide Excision Repair (NER) pathway genes were present in all analyzed Corynebacterium species, indicating its primary role in maintaining DNA integrity.
  • Recombination Repair (RR) genes were also widely conserved, and the absence of recCD genes was universal, potentially preventing genome inversions.
  • Mismatch Repair (MMR) appeared largely absent, though some related genes were found. Base Excision Repair (BER) and Direct Repair pathways showed less conservation, with gene presence varying across species.

Conclusions:

  • The study highlights the central role of NER in maintaining genomic stability across Corynebacterium species.
  • Conserved DNA repair mechanisms, like NER and RR, contribute to the genomic stability of Corynebacterium.
  • The presence or absence of specific DNA repair genes, potentially acquired or lost ancestrally, could influence pathogenicity and presents opportunities for therapeutic strategies against Corynebacterium infections.