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Vol. 12, Issue 12, 1992-1998, December 2002

METHODS
Highly Efficient Modification of Bacterial Artificial Chromosomes (BACs) Using Novel Shuttle Vectors Containing the R6Kgamma Origin of Replication

Shiaoching Gong,1,2 Xiangdong William Yang,1 Chenjian Li,1 and Nathaniel Heintz1,2,3,4

1 Laboratory of Molecular Biology, 2 Gensat project, 3 Howard Hughes Medical Institute, The Rockefeller University, New York, New York 10021, USA

Bacterial artificial chromosome (BAC) mediated transgenesis has proven to be a highly reliable way to obtain accurate transgene expression for in vivo studies of gene expression and function. A rate-limiting step in use of this technology to characterize large numbers of genes has been the process with which BACs can be modified by homologous recombination in Escherichia coli. We report here a highly efficient method for modifying BACs by using a novel set of shuttle vectors that contain the R6Kgamma origin for DNA replication, the E. coli RecA gene for recombination, and the SacB gene for negative selection. These new vectors greatly increased the ease with which one can clone the shuttle vectors, as well as screen for co-integrated and resolved clones. Furthermore, we simplify the shuttle vector cloning to one step by incorporation of a "built-in" resolution cassette for rapid removal of the unwanted vector sequences. This new system has been used to modify a dozen BACs. It is well suited for efficient production of modified BACs for use in a variety of in vivo studies.


4 Corresponding author.


12:1992-1998 ©2002 by Cold Spring Harbor Laboratory Press  ISSN 1088-9051/02 $5.00

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