Abstract
The allele sizes of polymorphic microsatellite repeats in DNA from human cancers were compared to normal DNA from the same patients. In 16 out of 196 paired samples (8%), we found evidence of an extra allele of a different size in the tumour which was not present in the normal DNA. Sequence analysis confirmed that the extra allele originates from the appropriate locus and that the size change is attributable to alteration in the number of repeat units. This form of instability was more common in tri– and tetranucleotide repeats than in dinucleotide repeats. In any single tumour sample only one repeat in the set examined was abnormal, the remainder showing identical patterns in normal and tumour DNA or evidence of allele loss. The pattern of instability in diverse types of cancer differs from that reported in colorectal neoplasms.
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Wooster, R., Cleton-Jansen, AM., Collins, N. et al. Instability of short tandem repeats (microsatellites) in human cancers. Nat Genet 6, 152–156 (1994). https://doi.org/10.1038/ng0294-152
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DOI: https://doi.org/10.1038/ng0294-152
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