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The Escherichia coli LexA repressor‐operator system works in mammalian cells.
Author(s) -
Smith G. M.,
Mileham K. A.,
Cooke S. E.,
Woolston S. J.,
George H. K.,
Charles A. D.,
Brammar W. J.
Publication year - 1988
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1002/j.1460-2075.1988.tb03285.x
Subject(s) - repressor lexa , biology , chloramphenicol acetyltransferase , repressor , reporter gene , microbiology and biotechnology , gene , promoter , regulation of gene expression , yy1 , escherichia coli , psychological repression , transcription (linguistics) , gatad2b , gene expression , genetics , linguistics , philosophy
We have demonstrated the use of the Escherichia coli LexA repressor‐operator system to down‐regulate gene expression in mouse cells. The LexA gene was placed downstream of the RSVLTR promoter with polyadenylation and splice signals from SV40. This expression unit was introduced into mouse Ltk‐ cells by calcium phosphate transfection and stable transfectants selected which express LexA protein. We have used the bacterial chloramphenicol acetyltransferase gene (CAT) as our reporter gene. Transcription of this gene was driven by the HSV tk promoter, into which we have introduced one or two synthetic LexA operator sequences in various positions throughout the promoter. Necessary 3′ signals were from the HSV tk gene. Repression by LexA was assessed by comparing the transient expression of tkCAT target constructs, containing LexA operator sequences in the promoter, in cells expressing LexA protein with that in control cells not expressing the repressor. We have observed up to 10‐fold repression of CAT expression in LexA+ cells from promoters containing LexA operator sequences.