Analysis of DNA hybridization in polyacrylamide gel.

We have made the first apparatus for fluorescent detection, monitoring the hybridization process of fluorescently labeled DNA fragments in a polyacrylamide gel. Using this, the analysis on the thermal denaturation/reassociation process of DNA fragments in the gel was employed, for improving the performance of In-Gel Competitive Reassociation (IGCR) technique, one of genome subtraction methods. We showed that Fluorescence Resonance Energy Transfer (FRET) in the gel occurred by positioning two fluorescent dyes at 3' and 5' ends of DNA fragments. The characterization of fluorescence-labelled fragments in gel and the changes of their fluorescence intensity will be reported.