It can be defined as an auditory–pigmentary syndrome that shares some common features with MITF-related WS type 2 (absence of dystopia canthorum), PAX3-related WS type 1 (low prevalence of deafness), and PAX3-related WS type 3 (limb abnormalities and contractures in certain cases of homozygous or compound heterozygous kittens). The gene discussed is PAX3; the disease is Waardenburg syndrome type 2.