Rapid and reliable genotyping technique for GM1 gangliosidosis in Shiba dogs by real-time polymerase chain reaction with TaqMan minor groove binder probes.

Real-time polymerase chain reaction (PCR) with TaqMan minor groove binder (MGB) probes was examined to establish a rapid and reliable genotyping technique for GM1 gangliosidosis in Shiba dogs. This technique was applied to DNA samples extracted from the blood, umbilical cord, or postmortem liver tissue specimens, and to DNA-containing solutions prepared from blood and saliva that had been applied to Flinders Technology Associates filter papers (FTA cards). The amplification of the targeted sequence in all the samples was sufficient to determine the genotypes of GM1 gangliosidosis. Forty-seven DNA samples that had previously been obtained from blood or tissue specimens of Shiba dogs were examined using this real-time PCR technique, and the findings were consistent with the data obtained by the earlier PCR-restriction fragment length polymorphism (RFLP) assay. In addition, the use of this new technique in combination with FTA cards for sampling could markedly shorten the time required for genotyping, as well as simplify the procedure. Furthermore, in the present study, the results of a previous epidemiological screening of 96 Shiba dogs in the Czech Republic were rechecked by this real-time PCR technique using stored crude buccal cell DNA-containing solutions directly as DNA templates. The results provided clear-cut genotyping in all the samples although the earlier PCR-RFLP assay could not determine the genotype in all cases. In conclusion, this new real-time PCR technique is a simple, rapid, and reliable choice for large-scale screening to detect an abnormal allele indicating GM1 gangliosidosis in Shiba dogs.