Mechanisms underlying losses of heterozygosity in human colorectal cancers

Sam Thiagalingam, Steve Laken, James K V Willson, Sanford D. Markowitz, Kenneth W. Kinzler, Bert Vogelstein, Christoph Lengauer

Research output: Contribution to journalArticlepeer-review

176 Scopus citations


Losses of heterozygosity are the most common molecular genetic alteration observed in human cancers. However, there have been few systematic studies to understand the mechanism(s) responsible for losses of heterozygosity in such tumors. Here we report a detailed investigation of the five chromosomes lost most frequently in human colorectal cancers. A total of 10,216 determinations were made with 88 microsatellite markers, revealing 245 chromosomal loss events. The mechanisms of loss were remarkably chromosome-specific. Some chromosomes displayed complete loss such as that predicted to result from mitotic nondisjunction. However, more than half of the losses were associated with losses of only part of a chromosome rather than a whole chromosome. Surprisingly, these losses were due largely to structural alterations rather than to mitotic recombination, break-induced replication, or gene conversion, suggesting novel mechanisms for the generation of much of the aneuploidy in this common tumor type.

Original languageEnglish (US)
Pages (from-to)2698-2702
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number5
StatePublished - Feb 27 2001

ASJC Scopus subject areas

  • General


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