Abstract
Microsatellites are highly polymorphic repetitive DNA segments dispersed throughout the genome and have been widely used for genetic linkage analysis and allele loss. Instability of microsatellites sequences has been linked to deficiencies in DNA mismatch repair, and is observed in a number of different tumor types. Analysis of microsatellite instability is thought to be a useful clinical tool for cancer diagnosis. Fluorescent detection of microsatellite instability using an automated DNA sequencer holds several distinct advantages over traditional radioactive analysis and electrophoresis, allowing simultaneous analysis of a number of different markers for a large number of samples, high resolution, sensitivity, and clear interpretation of data. In this article we present an established protocol, which has been used successfully to detect microsatellite instability in DNA samples from human tumors and circulating tumor DNA in serum/plasma.
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