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J. Virol., 08 1995, 4600-4606, Vol 69, No. 8
M Anton and FL Graham
We have constructed replication-defective human adenovirus (Ad) type 5
vectors containing the gene for the Cre recombinase from bacteriophage P1
under control of the human cytomegalovirus immediate-early promoter
(AdCre). Expression of the protein was detected in replication- permissive
(293) and in nonpermissive (MRC5) cell lines, and its biochemical activity
was demonstrated in a cell-free recombination assay using a plasmid
containing two loxP sites. To study Cre-mediated recombination in an
intracellular system, we constructed an Ad vector (AdMA19) containing the
luciferase cDNA under control of the human cytomegalovirus promoter but
separated from it by an extraneous spacer sequence flanked by loxP sites
which blocked luciferase expression. Upon coinfection of 293 or MRC5 cells
with AdMA19 and AdCre, luciferase expression was specifically induced by
Cre-mediated excision of the intervening sequence. The use of Ad vectors
combined with the Cre-loxP system for regulation of gene expression and
other possible applications is discussed.
Copyright © 1995, American Society for Microbiology
Site-specific recombination mediated by an adenovirus vector expressing the Cre recombinase protein: a molecular switch for control of gene expression
Department of Biology, McMaster University, Hamilton, Ontario, Canada.
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