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The combination of reverse transcribed-PCR and fluorescence-based single strand conformation polymorphism analysis has been proposed for the quantitative determination of ratio of mRNA molecules with homologous sequences. We applied this procedure to lactate dehydrogenase subunits M and H, and cyclooxygenase 1 and 2. We designed fluorescence labeled common PCR primers in the sequences highly homologous between two subunit and isozyme cDNAs, and performed reverse transcribed-PCR and fluorescencebased single strand conformation polymorphism analysis. PCR efficiency was almost the same for the different target sequences, so analysis of mixtures of known amounts of lactate dehydrogenase M and H revealed linear and precise proportions of lactate dehydrogenase M mRNA. It was shown that template concentrations and number of PCR cycles did not affect the determination of proportions of lactate dehydrogenase M to total lactate dehydrogenase. The procedure was applicable to a determination of cyclooxygenase-2 proportion; furthermore, the present procedure could be easily applied to investigation of expression levels of genes encoding mRNAs with homologous sequences.

clinical chemistry and laboratory medicine

Quantification of Relative Expression of Genes with Homologous Sequences Using Fluorescence-Based Single-Strand Conformation Polymorphism Analysis – Application to Lactate Dehydrogenase and Cyclooxygenase Isozymes