A novel method of subtraction cDNA hybridization allowing cloning of genes showing differential expression in cell micropopulations

: A novel, efficient and simple technique that combines subtractive hybridization with kinetic enrichment is proposed for obtaining enriched cDNA. The method is based on the use of a set of special primers that allow for the selective amplification by PCR only of differentially distributed sequences. Using the proposed technique, cDNA of a new gene XEp-1, specifically expressed in the presumptive epidermis of Xenopus laevis, was cloned, starting with the stage of midgastrula.