Tg(Ddx4-cre)1Dcas

A 5.6kb fragment of the Ddx4 promoter was ligated to the cre open reading frame with an engineered nuclear localization signal. Eight transgenic lines were created but only two possessed expressing in the gonads as early as E15. When the cre transgene is maternally expressed, all progeny can show ubiquitous recombination even if the cre is not inherited, likely due to perdurance of cre protein in the egg. The transgene integrated into chromosome 18 causing a 1098 Kb deletion and deleting the genes Neto1 and Cbln2. The deletion results in a functional knock-out of both genes in homozygous mice. Founder line 1 has a copy number of greater than 20. (J:125051)