Test Results: Pattern/Genotype C

Risk Group: High Risk

Risk for developing prcd form of PRA. Pattern C Australian Cattle Dogs and Nova Scotia Duck Tolling Retrievers are homozygous for prcd-PRA markers and are at high risk for developing PRA. There is a small theoretical chance, less than 0.5%, of a false positive result, meaning that a Pattern C dog could be a carrier, or with even lower chance, less than 0.0025%, could be normal. False positive results have not yet been observed with the current OptiGen test. Except for this theoretical possibility, all Pattern C dogs will eventually develop PRA if they live long enough. Known cases of extremely late onset of PRA indicate that some Pattern C dogs might not be diagnosed with PRA during their lifetime. So far, the only PRA disease known in Tollers is the prcd form of PRA. ACDs differ since there are rare cases either of acquired (non-inherited) retinal degeneration or of a non-prcd type of PRA. These conditions are not detectable with this prcd-PRA test.

For more information, please email me ( pjenn@io.com ) or go to the ACDCA.org genetics committee webpage.