Diagnostic primer sets for microsatellite instability optimized for a minimal amount of damaged DNA from colorectal tissue samples.
basic_science · Level V
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Abstract
The diagnosis of microsatellite instability from a minimal amount of highly damaged DNA, extracted from formalin-fixed, paraffin-embedded tissue by the microdissection method, is difficult. Therefore, optimized primer sets were newly designed for substitution of documented ones. DNA was extracted from 15 archival colorectal carcinomas and used as templates for polymerase chain reaction. Nine standard microsatellite markers (BAT-25, BAT-26, BAT-40, D18S69, D2S123, D5S346, D10S197, D17S250, and D18S58) were selected for diagnosis of microsatellite instability in colorectal carcinomas. All polymerase chain reaction conditions for primer sets were unified to save experimental time. The primer sets for the latter five markers documented in the literature were redesigned because of poor efficiency for damaged DNA. As a result, the number of DNA samples, sufficiently amplified at all markers, improved from 0% to 93%. Diagnostic primer sets for microsatellite instability, optimized for a minimal amount of damaged DNA from colorectal tissue samples, were established.
Medical subject headings
- Colorectal Neoplasms
- DNA, Neoplasm
- Microsatellite Repeats