TITLE

A general cloning system to selectively isolate any eukaryotic or prokaryotic genomic region in yeast

AUTHOR(S)
Noskov, Vladimir N.; Kouprina, Natalay; Sun-Hee Leem; Ouspenski, Ilia; Barrett, J. Carl; Larionov, Vladimir
PUB. DATE
January 2003
SOURCE
BMC Genomics;2003, Vol. 4, p16
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background: Transformation-associated recombination (TAR) cloning in yeast is a unique method for selective isolation of large chromosomal fragments or entire genes from complex genomes. The technique involves homologous recombination, during yeast spheroplast transformation, between genomic DNA and a TAR vector that has short (~60 bp) 5' and 3' gene targeting sequences (hooks). Result: TAR cloning requires that the cloned DNA fragment carry at least one autonomously replicating sequence (ARS) that can function as the origin of replication in yeast, which prevents wide application of the method. In this paper, we describe a novel TAR cloning system that allows isolation of genomic regions lacking yeast ARS-like sequences. ARS is inserted into the TAR vector along with URA3 as a counter-selectable marker. The hooks are placed between the TATA box and the transcription initiation site of URA3. Insertion of any sequence between hooks results in inactivation of URA3 expression. That inactivation confers resistance to 5-fluoroorotic acid, allowing selection of TAR cloning events against background vector recircularization events. Conclusion: The new system greatly expands the area of application of TAR cloning by allowing isolation of any chromosomal region from eukaryotic and prokaryotic genomes regardless of the presence of autonomously replicating sequences.
ACCESSION #
28834575

 

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