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Targeting frequency for deletion vectors in embryonic stem cells.

Institute for Molecular Genetics, Baylor College of Medicine, Houston, Texas 77030.

ABSTRACT

We analyzed the gene targeting frequencies and recombination products generated by a series of replacement deletion vectors which target the hprt (hypoxanthine phosphoribosyltransferase) locus in mouse embryonic stem cells. We found that the targeting frequency of a 19.2-kb deletion was comparable to that of a 3-kb deletion or a conventional replacement event in which a 1.7-kb fragment was inserted into the locus. We also observed different integration patterns for these deletion vectors. A result of this finding is that a wide range of genomic deletions in embryonic stem cells is feasible.

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