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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...
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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

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Nucleotide Excision Repair01:08

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Assessing Somatic Hypermutation in Ramos B Cells after Overexpression or Knockdown of Specific Genes
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Published on: November 1, 2011

Senescence-dependent MutS alpha dysfunction attenuates mismatch repair.

In-Youb Chang1, Ming Jin, Sang Pil Yoon

  • 1Korean DNA Repair Research Center, Republic of Korea (South Korea).

Molecular Cancer Research : MCR
|June 24, 2008
PubMed
Summary

Genomic instability increases with age due to reduced DNA mismatch repair (MMR) efficiency in senescent cells. This is caused by down-regulation of the MutS alpha complex, specifically MSH2, linked to decreased E2F1 activity.

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Area of Science:

  • Cellular senescence
  • Genomic instability
  • DNA repair mechanisms

Background:

  • Aging is associated with increased DNA damage and mutations.
  • Genomic instability is a hallmark of aging and cancer.
  • DNA mismatch repair (MMR) corrects errors during DNA replication.

Purpose of the Study:

  • To investigate the mechanisms underlying age-dependent increases in genomic instability.
  • To analyze DNA mismatch repair (MMR) efficiency in young versus senescent cells.
  • To identify key molecular players involved in MMR dysfunction during senescence.

Main Methods:

  • Analysis of MMR efficiency in young and senescent human fibroblasts.
  • Western blot and immunohistochemistry to assess MutS alpha complex (hMSH2 and MSH6) protein levels.
  • Semiquantitative reverse transcription-PCR to measure MSH2 mRNA levels.
  • Investigation of E2F transcriptional activity and its role in MSH2 regulation.

Main Results:

  • MMR activity is significantly reduced in senescent cells compared to young cells.
  • Levels of hMSH2 and MSH6 proteins (MutS alpha) are markedly down-regulated in senescent cells.
  • Restoration of MMR activity was observed upon addition of purified MutS alpha to senescent cell extracts.
  • MSH2 mRNA levels are reduced in senescent cells, linked to decreased E2F transcriptional activity.
  • E2F1 suppression in senescent cells leads to stable repression of MSH2 and reduced MMR capacity.

Conclusions:

  • Suppression of E2F1 transcriptional activity in senescent cells causes MSH2 down-regulation.
  • This leads to MutS alpha dysfunction and reduced cellular MMR capacity.
  • The findings elucidate a mechanism for age-related genomic instability via MMR deficiency.