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Nucleic Acids Research, Vol 27, Issue 21 4276-4281, Copyright © 1999 by Oxford University Press

ARTICLES

Construction of a recombinant adenovirus for efficient delivery of the I-SceI yeast endonuclease to human cells and its application in the in vivo cleavage of chromosomes to expose new potential telomeres

M Anglana and S Bacchetti
Department of Pathology and Molecular Medicine, McMaster University, 1200 Main Street West, Hamilton, Ontario L8N 3Z5, Canada.

We have constructed a replication-defective adenovirus vector encoding the yeast I- Sce I endonuclease under the control of the murine cytomegalovirus immediate-early gene promoter (AdM Sce I) for efficient delivery of this enzyme to mammalian cells. We present evidence of AdM Sce I-mediated I- Sce I protein expression and cleavage activity in replication-permissive 293 cells, and of cleavage of chromosomes in vivo in both 293 cells and in non-permissive human cells. We have exploited this system for the generation of chromosomes capped by artificial telomeric sequences in cells with integrated plasmids containing telomeric DNA arrays adjacent to an I- Sce I recognition site. The properties of the AdM Sce I virus described here make it a useful tool for studying biological processes involving induction of DNA breaks, recombination and gene targeting in cells grown in culture and in vivo.
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