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We present a novel subtractive enrichment protocol for the identification of differentially expressed mRNA species. This procedure, called SABRE (selective amplification via biotin- and restriction-mediated enrichment), uses selective streptavidin-biotin affinity and restriction enzyme site reconstitution to enrich for cDNA species more abundant in one population than in another. Analysis of liver cDNA from a mouse strain expressing the neomycin resistance gene demonstrated that this procedure is capable of identifying species present in one population but absent from another. Furthermore, experiments to identify genes with circadian expression patterns in mouse liver demonstrated that SABRE is capable of detecting even modest 2- to 10-fold differences in accumulation of moderately rare mRNA species, representing as little as 0.03% of total mRNA. These experiments identified the gene encoding coumarin 7-hydroxylase as displaying circadian expression in mouse liver.

proceedings of the national academy of sciences of the united states of america

Selective amplification via biotin- and restriction-mediated enrichment (SABRE), a novel selective amplification procedure for detection of differentially expressed mRNAs