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Related Experiment Videos

Genetic instability in colorectal cancers

C Lengauer1, K W Kinzler, B Vogelstein

  • 1The Howard Hughes Medical Institute and The Johns Hopkins Oncology Center, Baltimore, Maryland 21231, USA.

Nature
|April 10, 1997
PubMed
Summary

Genetic instability is crucial for colorectal cancer development. Two distinct pathways, microsatellite instability and chromosomal instability, contribute to this genetic defect in tumors.

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Genetic instability is a hallmark of human neoplasia.
  • Microsatellite instability (MSI) is a known genetic defect in some tumors.
  • The nature of chromosomal instability (CIN) in other tumors remains unclear.

Purpose of the Study:

  • To investigate the nature and magnitude of genetic instability in colorectal tumors.
  • To determine if chromosomal instability is a distinct pathway in colorectal cancer development.
  • To compare chromosomal instability with microsatellite instability.

Main Methods:

  • Analysis of chromosome segregation in colorectal tumors lacking microsatellite instability.
  • Quantification of chromosome gains and losses per chromosome per generation.
  • Assessment of the persistence and inheritance of chromosomal instability.

Main Results:

  • Colorectal tumors without MSI exhibit significant defects in chromosome segregation.
  • This chromosomal instability results in substantial gains or losses of chromosomes.
  • Chromosomal instability is a persistent, dominant cellular defect, unlike recessive MSI.

Conclusions:

  • Persistent genetic instability is critical for all colorectal cancer development.
  • Two distinct pathways, MSI and CIN, contribute to colorectal tumorigenesis.
  • Chromosomal instability represents a significant, dominant genetic defect in a subset of colorectal cancers.

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