Full-length cDNAs are essential for the correct annotation of transcriptional units and gene products from genomic sequence data and for functional analysis of the genes. Full-length cDNA libraries are very important resources for isolation of the full-length cDNAs. The biotinylated cap trapper method using the trehalose-thermostabilized reverse transcriptase has been developed and has become an efficient method for construction of high-content full-length cDNA libraries. We have constructed full-length cDNA libraries from various plants and animals using this method. The protocol of the method is described in this chapter.
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