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HNPCC: six new pathogenic mutations.

Erdmute Kunstmann1, Judith Vieland, Frank E Brasch

  • 1Human Genetics, University of Bochum, Bochum, Germany. erdmute.kunstmann@rub.de

BMC Medical Genetics
|June 26, 2004
PubMed
Summary
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Hereditary non-polyposis colorectal cancer (HNPCC) is linked to DNA mismatch-repair gene mutations. This study identified six new mutations in MLH1, MSH2, and MSH6, contributing to high microsatellite instability in tumors.

Area of Science:

  • Genetics
  • Oncology
  • Molecular Biology

Background:

  • Hereditary non-polyposis colorectal cancer (HNPCC) significantly increases colorectal and endometrial cancer risk.
  • Caused by germline mutations in DNA mismatch-repair (MMR) genes.
  • HNPCC accounts for 2-5% of all colorectal cancers.

Purpose of the Study:

  • Identify novel mutations in MMR genes (MLH1, MSH2, MSH6) in HNPCC patients.
  • Characterize the impact of these mutations on protein function and cancer development.

Main Methods:

  • Clinical diagnosis of HNPCC and patient counseling.
  • Tumor specimen analysis for microsatellite instability (MSI).
  • Immunohistochemistry for MLH1, MSH2, and MSH6 protein expression.
  • Mutation analysis of MMR genes if protein is undetectable.

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Main Results:

  • Identified 6 novel frameshift mutations: 2 in MLH1, 3 in MSH2, and 1 in MSH6.
  • All identified mutations lead to premature stop codons.
  • All six tumors analyzed exhibited high microsatellite instability (MSI-H).

Conclusions:

  • Novel mutations in MLH1, MSH2, and MSH6 contribute to HNPCC.
  • MSH6 mutations may present with an age of onset similar to MLH1 and MSH2 mutations in HNPCC families.