Send to

Choose Destination
Mol Cell. 2003 Dec;12(6):1615-24.

Conditional protein alleles using knockin mice and a chemical inducer of dimerization.

Author information

Department of Developmental Biology, Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA 94305, USA.


We have developed a general method of making conditional alleles that allows the rapid and reversible regulation of specific proteins. A mouse line was produced in which proteins encoded by the endogenous glycogen synthase kinase-3 beta (GSK-3beta) gene are fused to an 89 amino acid tag, FRB*. FRB* causes the destabilization of GSK-3beta, producing a severe loss-of-function allele. In the presence of C20-MaRap, a highly specific, nontoxic, cell-permeable small molecule, GSK-3betaFRB* binds to the ubiquitously expressed FKBP12 protein. This interaction stabilizes GSK-3betaFRB* and restores both protein levels and activity. C20-MaRap-mediated stabilization is rapidly reversed by the addition of an FKBP12 binding competitor molecule. This technology may be applied to a wide range of FRB*-tagged mouse genes while retaining their native transcriptional control. Inducible stabilization could be valuable for many developmental and physiological studies and for drug target validation.

[Indexed for MEDLINE]
Free full text

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center