A method for comparative analysis of gene expression was developed. It is based on competitive PCR amplification and real-time detection of PCR products and it uses module-shuffling sequences as "universal TaqMan probes". Namely, cDNA-tagged module-shuffling sequences, which derived from different sources, were amplified in one reaction tube by the same primer set. Two kinds of fluorescent TaqMan probes with different module-shuffling sequences (MTPs) detect their own targets. The method can detect different amounts of expressed genes derived from different sources; accordingly, it was successfully used for comparative analysis of expressed mouse genes.
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