Slc17a8 Knockin mouse models

Restricted but functionally distinctive, Slc17a8 encodes the mouse ortholog of human SLC17A8, VGLUT3, an SLC17 vesicular glutamate transporter expressed not in canonical glutamatergic neurons but in cholinergic striatal interneurons, serotonergic raphe neurons, a subset of GABAergic cortical interneurons, cochlear inner hair cells, and some dorsal root ganglion neurons, where it enables glutamate co-release and vesicular synergy that enhances loading of the primary transmitter. Dominant SLC17A8 variants cause autosomal dominant nonsyndromic deafness DFNA25, and knockout mice are profoundly deaf from failed inner hair cell transmission while also showing altered anxiety, cocaine response, and audiogenic seizure susceptibility. Because the null is viable, constitutive deletion is feasible, but conditional alleles are preferred when separating cochlear from central contributions, and knockin Cre alleles give access to co-releasing populations. Redundancy with Slc17a6 and Slc17a7 is minimal in these cell types, so match allele class directly to auditory, striatal, or serotonergic endpoints.

Slc17a8 knockin models place a defined sequence at the endogenous locus. Expression stays under native regulation, which matters for reporters, tags, and precise allele swaps.