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Nucleic Acids Research, 2001, Vol. 29, No. 4 e22
© 2001 Oxford University Press

Directional cDNA library construction assisted by the in vitro recombination reaction

Osamu Ohara* and Gary Temple1

Kazusa DNA Research Institute, 1532-3 Yana, Kisarazu, Chiba 292-0812, Japan and 1Life Technologies Division of Invitrogen Corporation, 9800 Medical Center Drive, Rockville, MD 20850, USA

We report here a new directional cDNA library construction method using an in vitro site-specific recombination reaction, based on the integrase–excisionase system of bacteriophage {lambda}. Preliminary experiments revealed that in vitro recombinational cloning (RC) provided important advantages over conventional ligation-assisted cloning: it eliminated restriction digestion for directional cloning, generated low levels of chimeric clones, reduced size bias and, in our hands, gave a higher cloning efficiency than conventional ligation reactions. In a cDNA cloning experiment using an in vitro synthesized long poly(A)+ RNA (7.8 kb), the RC gave a higher full-length cDNA clone content and about 10 times more transformants than conventional ligation-assisted cloning. Furthermore, characterization of rat brain cDNA clones yielded by the RC method showed that the frequency of cDNA clones >2 kb having internal NotI sites was ~6%, whereas these cDNAs could not be cloned at all or could be isolated only in a truncated form by conventional methods. Taken together, these results indicate that the RC method makes it possible to prepare cDNA libraries better representing the entire population of cDNAs, without sacrificing the simplicity of current conventional ligation-assisted methods.

* To whom correspondence should be addressed. Tel: +81 438 52 3913; Fax: +81 438 52 3914; Email: ohara{at}kazusa.or.jp


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