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  • Title: Frequency of the codon 807 mutation in the cGMP phosphodiesterase beta-subunit gene in Irish setters and other dog breeds with hereditary retinal degeneration.
    Author: Aguirre GD, Baldwin V, Weeks KM, Acland GM, Ray K.
    Journal: J Hered; 1999; 90(1):143-7. PubMed ID: 9987922.
    Abstract:
    Rod-cone dysplasia 1 (rcd1) in Irish setters is caused by a nonsense mutation in the cGMP phosphodiesterase beta-subunit gene (PDE6B). We examined the frequency of the mutant allele in the Irish setter population and determined if the defect is present in dogs of other breeds which are affected with other inherited photoreceptor diseases. Between 1994 and 1997, samples were obtained from 436 clinically normal Irish setters, a red wolf, and dogs from 23 different breeds. The mutation in codon 807 of PDE6B was detected in genomic DNA by heteroduplex analysis, allele-specific PCR, or restriction enzyme digestion. Of the 436 samples from clinically normal setters, 34 contained the mutation in one of the two PDE6B alleles (carrier rate = 7.8%). In contrast, the same mutation was not found in the red wolf or dogs of other breeds affected with PRA or inherited photoreceptor diseases. The high percentage of tested carriers, however, is not representative of the number of carriers in the population since some dogs tested were closely related and did not represent a random sample of the Irish setter breed.
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