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Related Experiment Videos

Ligase-based detection of mononucleotide repeat sequences.

M Zirvi1, T Nakayama, G Newman

  • 1Department of Microbiology, Box 62, Hearst Microbiology Research Center, Strang Cancer Prevention Center, Joan and Sanford I. Weill Medical College of Cornell University, 1300 York Avenue, New York, NY 10021, USA.

Nucleic Acids Research
|November 26, 1999
PubMed
Summary
This summary is machine-generated.

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Thermostable DNA ligases detect microsatellite alterations in colorectal cancer. This assay identifies tumor mutations and screens for hereditary colon cancer predisposition.

Area of Science:

  • Molecular Biology
  • Genetics
  • Oncology

Background:

  • Replication error positive (RER(+)) colorectal cancers, up to 15% of all cases, harbor mutations in microsatellite repeat sequences.
  • Intragenic mononucleotide repeats are frequently inactivated in RER(+) colorectal tumors, highlighting their significance in cancer development.

Purpose of the Study:

  • To evaluate the efficacy of thermostable DNA ligases in detecting microsatellite sequence alterations in colon tumor samples.
  • To assess the sensitivity and specificity of a ligase-based assay for identifying specific mutations and genetic predispositions related to colorectal cancer.

Main Methods:

  • Four thermostable DNA ligases were analyzed for their ligation profiles on mononucleotide repeat sequences.
  • A fluorescent ligase-based assay, polymerase chain reaction/ligase detection reaction (PCR/LDR), was developed and validated against radioactive assays and sequencing methods.

Related Experiment Videos

Main Results:

  • The ligase assay demonstrated a detection limit of one mutation in 100 wild-type sequences for single-base deletions in a 10-base mononucleotide repeat.
  • Misligation error increased exponentially with mononucleotide repeat length, reaching 10% for a 19-base repeat.
  • PCR/LDR accurately detected microsatellite instability in the TGF-beta Type II receptor gene and identified the APCI1307K allele in a blind study.

Conclusions:

  • Ligation assays effectively characterize mononucleotide repeats for rapid detection of somatic mutations in tumors.
  • This methodology can be utilized for screening individuals with a hereditary predisposition to colon cancer, such as carriers of the APCI1307K allele.