In an attempt to offer alleles on well-characterized or multiple genetic backgrounds, alleles are frequently moved to a genetic background different from that on which an allele was first characterized. This is the case for these C57BL/6J-congenic D1-Cre YAC transgenic mice. It should be noted that the phenotype of these mice could vary from that originally described on a 129 genetic background (Stock No. <a href="https://www.jax.org/strain/028298">028298</a>) - see phenotype below. We may modify the C57BL/6J-congenic D1-Cre YAC transgenic strain description if necessary as published results become available. Alterations in dopamine signaling are responsible for several psychomotor disorders. D1-Cre YAC transgenic mice express Cre recombinase from the mouse Drd1a (dopamine receptor D1) promoter. The spatio-temporal pattern of Cre expression in dopaminoceptive neurons is reported to closely recapitulate that of the endogenous Drd1a gene in embryonic and adult stages, as assessed by immunohistological approaches. Expression is reported to be prominent in the major projection areas of the dopaminergic system, including the striatum, nucleus accumbens, olfactory tubercles and prefrontal cortex. Clear but lower expression is seen in layer VI of the cortex. In hippocampus, CA2 and scattered cells in the dentate gyrus express Cre. Several thalamic nuclei and the ventromedian hypothalamic nucleus also express Cre. In retina, robust staining is observed in the inner nuclear layer. Cre begins to be expressed, albeit at low levels, at E16 in the striosomal neurons of the embryonic striatum. &nbsp;

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D1-Cre YAC transgenic mice have Cre recombinase expressed from the mouse Drd1a promoter. The spatio-temporal pattern of Cre expression in dopaminoceptive neurons is reported to closely recapitulate that of the endogenous Drd1a gene in embryonic and adult stages. Of note, D1-Cre YAC transgenic mice are available on 129S-congenic background (Stock No. <a href="https://www.jax.org/strain/028298">028298</a>) and C57BL/6J-congenic background (Stock No. 030329).

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