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Related Concept Videos

Mismatch Repair01:20

Mismatch Repair

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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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Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
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Gene Conversion02:08

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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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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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Proofreading01:31

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Single-Strand DNA Binding Proteins01:03

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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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Unexpected moves: a conformational change in MutSα enables high-affinity DNA mismatch binding.

Susanne R Bruekner1, Wietske Pieters2, Alexander Fish1

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Summary

A mutation in the MSH2 gene (V63E) causes mild defects in DNA mismatch repair (MMR), impacting replication fidelity. This research reveals a critical interface disruption, explaining the patient's cancer predisposition.

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Area of Science:

  • Molecular biology
  • Genetics
  • Cancer research

Background:

  • DNA mismatch repair (MMR) corrects DNA replication errors, preventing cancer.
  • Mutations in MMR genes, like MSH2, can cause cancer predisposition.
  • Constitutional mismatch repair deficiency (CMMRD) syndrome is a rare genetic disorder linked to MMR gene mutations.

Purpose of the Study:

  • To investigate the functional impact of the V63E mutation in the MSH2 gene.
  • To elucidate the molecular mechanism by which V63E affects MutSα protein function.
  • To understand the basis of the mildly pathogenic phenotype observed in a patient with this mutation.

Main Methods:

  • Characterization of the V63E mutant in mouse models.
  • In vitro slippage and DNA repair assays.
  • Cryogenic electron microscopy (cryo-EM) and surface plasmon resonance (SPR) analyses.

Main Results:

  • The V63E mutation in MSH2 exhibits a mildly pathogenic phenotype.
  • V63E disrupts a critical interface between the MSH2 and MSH6 mismatch binding domains (MBDs) within the MutSα complex.
  • This disruption leads to reduced DNA binding affinity of MutSα.

Conclusions:

  • The MSH2/MSH6 MBD interface acts as a 'safety lock' crucial for high-affinity DNA binding and replication fidelity.
  • The V63E mutation impairs this safety lock, explaining the hypomorphic phenotype in patients.
  • Understanding this mechanism aids in diagnosing and potentially treating CMMRD syndrome and related cancers.