Fluorescent oligonucleotide ligation technology for identification of ras oncogene mutations |
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Authors: | Faye A Eggerding |
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Institution: | (1) Molecular Oncology Laboratory, Huntington Medical Research Institutes, 99 North El Molino Avenue, 91101 Pasadena, CA |
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Abstract: | A mutation detection strategy based on multiplex PCR followed by multiplex allele-specific oligonucleotide probe ligation
was developed to detect single nucleotide substitutions in ras oncogenes, a common genetic abnormality in many human cancers. Mutation-specific probes are synthesized for each possible
single-base, nonsilent mutation in codons 12, 13, and 61 of H-, K-, and N-ras oncogenes. Mutations are identified by competitive oligonucleotide probe ligation to detect normal and /or mutant genotypes
in one reaction. Three probes (one common and two allelic probes) are needed for analysis of each mutation. Probes hybridized
to target ras oncogene DNA are joined by a thermostable ligase if there are no mismatches at their junctions; temperature cycling results
in a linear increase in product. Common probes are labeled with fluorochromes, and allelic probes each have different lengths.
Ligation products are analyzed by denaturing polyacrylamide gel electrophoresis on a fluorescent DNA sequencer. We have applied
this technology to identify ras mutations in pancreatic cancers and lung cancers and in patients with myelodysplastic syndromes and leukemias. |
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Keywords: | ras genotyping multiplex amplification ligation |
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