PMID- 22484114 OWN - NLM STAT- MEDLINE DCOM- 20121126 LR - 20120723 IS - 1873-4863 (Electronic) IS - 0168-1656 (Linking) VI - 160 IP - 3-4 DP - 2012 Aug 31 TI - Construction of a long hairpin RNA expression library using Cre recombinase. PG - 129-39 LID - 10.1016/j.jbiotec.2012.03.016 [doi] AB - A large number of genome-wide screens using RNA interference (RNAi) libraries have been utilized to determine the function of individual gene products involved in a variety of biological processes. In this study, we describe a new method to enzymatically generate a long hairpin RNA (lhRNA) expression library from a cDNA plasmid library using a nicking endonuclease, BcaBEST DNA polymerase, and Cre recombinase without excising the inserted DNA fragment from the plasmid vector. This method involves 5 steps: (1) conversion of an inserted DNA fragment in a plasmid into a direct repeat (DR); (2) purification of the plasmid containing the DR; (3) subcloning a lox71 cassette into the plasmid; (4) conversion of the DR in the plasmid into an inverted repeat (IR) using Cre recombinase; and (5) purification of the plasmid containing the IR. We also established an efficient method for inserting DNase I-digested DNA fragments into expression plasmids to enable construction of a cDNA plasmid library suitable as source materials to construct the lhRNA expression library. We confirmed that each of the lhRNA expression plasmids constructed using this method induced strong RNAi in a silkworm cell line, NIAS-Bm-oyanagi2. CI - Copyright (c) 2012 Elsevier B.V. All rights reserved. FAU - Tomimoto, Kazuya AU - Tomimoto K AD - Insect Mimetics Research Unit, National Institute of Agrobiological Sciences, 1-2 Owashi, Tsukuba, Ibaraki 305-8634, Japan. FAU - Yamakawa, Minoru AU - Yamakawa M FAU - Tanaka, Hiromitsu AU - Tanaka H LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20120330 PL - Netherlands TA - J Biotechnol JT - Journal of biotechnology JID - 8411927 RN - 63231-63-0 (RNA) RN - EC 2.7.7.- (Cre recombinase) RN - EC 2.7.7.- (Integrases) SB - IM MH - Cloning, Molecular/*methods MH - *Gene Library MH - Integrases/*genetics MH - RNA/*biosynthesis/*genetics EDAT- 2012/04/10 06:00 MHDA- 2012/12/10 06:00 CRDT- 2012/04/10 06:00 PHST- 2012/01/05 00:00 [received] PHST- 2012/03/15 00:00 [revised] PHST- 2012/03/20 00:00 [accepted] PHST- 2012/04/10 06:00 [entrez] PHST- 2012/04/10 06:00 [pubmed] PHST- 2012/12/10 06:00 [medline] AID - S0168-1656(12)00183-6 [pii] AID - 10.1016/j.jbiotec.2012.03.016 [doi] PST - ppublish SO - J Biotechnol. 2012 Aug 31;160(3-4):129-39. doi: 10.1016/j.jbiotec.2012.03.016. Epub 2012 Mar 30.