Nucleic Acids Research, 1993, Vol. 21, No. 9 2025-2029
© 1993
MOLECULAR BIOLOGY |
Genomic targeting with purified Cre recombinase
1Biotechnology R & D, DuPont Merck Pharmaceutical Co. Experimental Station E400, Wilmington, DE 19880-0400, USA
* To whom correspondence should be addressed
Received March 23, 1993. Accepted February 26, 1993.
Purified Cre recombinase protein Introduced directly Into cultured mammalian cells by lipofection catalyzes both site-specific chromosomal Integration of a cotransfected lox targeting vector and precise excision of genomic DNA flanked by directly repeated lox sites. This procedure ellminates the need to transfect cre expression piasmids to activate recombination at lox sites. We used this simplified procedure to investigate the effect on targeting efficiency of both lox vector design and chromosomal position of the lox target. We show that such chromosomal position effects can exert at least a 50-fold per lox target difference in targeting efficiency in a human osteosarcoma cell line.
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