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Mouse models for human DNA mismatch-repair gene defects

Kaichun Wei1, Raju Kucherlapati, Winfried Edelmann

  • 1Dept of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA.

Trends in Molecular Medicine
|July 13, 2002
PubMed

Insights

Mammalian DNA mismatch-repair genes are crucial for preventing mutations and cancer. Studies in mice reveal their essential roles in DNA repair, mutation avoidance, and even meiosis.

Area of Science:

  • Genetics
  • Molecular Biology
  • Cancer Research

Background:

  • Mammalian DNA mismatch-repair (MMR) genes are homologs of E. coli mutS and mutL.
  • Mutations in human MSH2 and MLH1 are linked to hereditary nonpolyposis colorectal cancer and sporadic colorectal cancers.
  • The precise roles of MMR proteins in colorectal cancer initiation and progression require further investigation.

Purpose of the Study:

  • To systematically analyze the function of all known mutS and mutL homologs in mammals.
  • To understand the significance of MMR genes in mutation avoidance and cancer susceptibility at the organismal level.
  • To investigate the potential role of MMR genes in mammalian meiosis.

Main Methods:

  • Generation of mouse models with inactivating mutations in all known mutS and mutL homologs.
  • Systematic analysis of gene function in DNA repair processes.
  • Assessment of mutation avoidance, cancer susceptibility, and meiotic functions in these mouse models.

Main Results:

  • Inactivating mutations in MMR genes significantly impact mutation avoidance and cancer susceptibility in mice.
  • The study highlights the critical role of MMR genes in maintaining genomic stability.
  • An essential role for specific DNA mismatch-repair genes in mammalian meiosis was uncovered.

Conclusions:

  • DNA mismatch-repair genes are vital for preventing mutations and susceptibility to cancer in mammals.
  • These genes play a fundamental role in DNA repair and genomic integrity.
  • The findings reveal a previously unrecognized essential function of MMR genes in mammalian meiosis.

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