Pvalb^{tm1.1(cre/ERT2)Hze}

Embryonic stem (ES) cells, previously targeted with a T2A-Cre vector immediately downstream of the parvalbumin translational STOP codon were re-targeted with a T2A-CreERT2 vector and a FLP-expressing plasmid to facilitate recombination. Correctly targeted ES cells had (from 5' to 3') a three amino acid linker sequence, an frt3 site within Pvalb intron 3, a partial Pvalb exon 4 sequence up to (but not including) the endogenous stop codon, a T2A sequence that is in-frame with the Pvalb coding sequence, a CreERT2 fusion gene, the Pvalb 3' UTR sequence from exon 4, an attB site, a PGK-hygromycin-SV40polyA cassette and an attP site. Correctly targeted ES cells were injected into recipient blastocysts. The resulting chimeric animals were bred to PhiC31-expressing mice to delete the attB/attP-flanked PGK cassette. The resulting mice were bred with C57BL/6J wildtype mice for at least two additional generations (and the PhiC31 transgene was removed). (J:155793, J:191262, J:220523)