Expression sequence tag-specific full-length cDNA cloning: actin cDNAs

Current strategies for cDNA cloning are based on construction of cDNA libra ries and colony screening, The process of obtaining a full length cDNA clon e can be highly time and labor intensive. Using the human actin gene as a m odel target cDNA, we have developed an RNA-capture method for rapid cloning of full-length cDNAs. The approach involves the capture of mRNA with expre ssed sequence tag (EST)derived, biotin labeled antisense 'capture' primers and streptavidin-coated magnetic beads. Full-length cDNA is then synthesize d from purified EST-specific mRNA and cloned directly into plasmid vectors. The results of using beta -actin-based capture primers on cytoplasmic RNA were the isolation of both beta- and gamma -actin cDNA clones. Of the 16 ac tin-specific cDNA clones analyzed, 15 (93%) were full-length. This approach for cloning full-length cDNAs from available ESTs or partial cDNA sequence s will facilitate a more rapid and efficient characterization of gene struc ture and function. (C) 2001 Elsevier Science B.V. All rights reserved.