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Nucleic Acids Res. 1997 June 15; 25(12): 2532–2534.
PMCID: PMC146738

COBRA: a sensitive and quantitative DNA methylation assay.

Abstract

We report here on a quantitative technique called COBRA to determine DNA methylation levels at specific gene loci in small amounts of genomic DNA. Restriction enzyme digestion is used to reveal methylation-dependent sequence differences in PCR products of sodium bisulfite-treated DNA as described previously. We show that methylation levels in the original DNA sample are represented by the relative amounts of digested and undigested PCR product in a linearly quantitative fashion across a wide spectrum of DNA methylation levels. In addition, we show that this technique can be reliably applied to DNA obtained from microdissected paraffin-embedded tissue samples. COBRA thus combines the powerful features of ease of use, quantitative accuracy, and compatibility with paraffin sections.

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Articles from Nucleic Acids Research are provided here courtesy of Oxford University Press