Abstract

This chapter discusses cDNA cloning that constitutes one of the essential steps to isolate and characterize complex eukaryotic genes, and to express them in a wide variety of host cells. Expression cloning has proven extremely powerful if appropriate functional assays or genetic complementation selection systems are available. Successful construction of full-length cDNA libraries depends heavily on the quality of the mRNA preparation. The use of intact, uncontaminated mRNA is essential for generating full-length clones. The use of clean, intact mRNA, fresh RNase-free reverse transcriptase, and a well-prepared vector primer is essential for the efficient synthesis of long cDNA. Pilot transfections with cyclized plasmid should always be undertaken before attempting to make a large library. Expression cloning of transiently expressed cDNAs can be used successfully provided that a sensitive assay is available and that the clones of interest are present in reasonable abundance.

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