The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 31, 2006
Filed:
Apr. 25, 2001
Jürgen Bode, Braunschweig, DE;
Jost Seibler, Braunschweig, DE;
Dirk Schübeler, Braunschweig, DE;
Gesellschaft fur Biotechnologische Forschung mbH, Braunschweig, DE;
Abstract
The invention relates to a method for marker-free DNA expression cassette exchange in the genome of cells or parts of cells by using the FLP recombinase mediated cassette exchange. A first DNA expression cassette carrying a positive-negative selection marker flanked by two FLP recombinase recognition target (FRT) sites is integrated into a chromosomal locus of the genome. Following selection of cell clones surviving the conditions for positive selection, the first DNA cassette is exchanged by an incoming second DNA expression cassette located on a circular vector and carrying a transgene flanked by the same FRT sites as the first DNA cassette by using FLP-recombinase. The cell clones surviving the conditions for negative selection contain specifically inserted the gene of the incoming DNA cassette without inserted unwanted vector sequences or positive selectable markers.