期刊
GENOMICS
卷 77, 期 1-2, 页码 79-90出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/geno.2001.6601
关键词
full-length cDNA; cloning vector; function vector; normalization and subtraction; gene discovery
We have developed a new class of cloning vectors: lambda -full-length cDNA (lambda -FLC) cloning vectors. These vectors can be bulk-excised for preparing full-length cDNA libraries in which a high proportion of the plasmids carry large inserts that can be transferred into other (for example, functional) vectors. Unlike other cloning vectors, lambda -FLC vectors accommodate a broad range of sizes of eukaryotic cDNA inserts because they contain size balancers. Further, the main protocol we use for direct bulk excision of plasmids is mediated by a Cre-lox system and is apparently free of size bias. The average size of the inserts from excised plasmid cDNA libraries was 2.9 kb for standard and 6.9 kb for size-selected cDNA. The average insert size of the full-length cDNA libraries was correlated to the rate of new gene discovery, suggesting that effectively cloning rarely expressed mRNAs requires vectors that can accommodate large inserts from a variety of sources. Part of the vectors are also suitable for bulk transfer of inserts into various functional vectors.
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