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Diagn Mol Pathol. 1998 Oct;7(5):248-52.

Amplification refractory mutation system linear extension: a novel, gel-free, enzyme-linked immunoassay method for DNA genotyping.

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Zeneca Diagnostics, Northwich, Cheshire, U.K.


A single synthesis cycle of the amplification refractory mutation system (ARMS) was applied to the analysis of K-ras alleles amplified by polymerase chain reaction and immobilized in streptavidin-coated microtiter plates. The ARMS cycle provided the specificity and molecular switch characteristics of a conventional ARMS assay. This allowed linear extension from an allele-specific primer and the incorporation of digoxigenin-labeled deoxyuridine monophosphate from digoxigenin-11-deoxyuridine triphosphate in the presence of the appropriate K-ras allele. Any digoxigenin-labeled deoxyuridine monophosphate substitution was then demonstrated by enzyme-linked immunoassay with colorimetric endpoint. This method is capable of detecting underrepresented acquired mutations, and this has been shown by the unambiguous detection of specific K-ras mutations in cell line DNA/normal human genomic DNA admixtures. The characterization of K-ras mutations in frozen colorectal tumor samples and histologic material is also described.

[Indexed for MEDLINE]

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