Prion protein polymorphisms and estimation of risk of scrapie in East Asian sheep
| Autor: | Heramba B. Rajbandary, Takao Namikawa, Maung Maung Nyunt, Chau Ba Loc, Kenji Tsunoda, Hong Chang, Ts Zanchiv, Tasi Dorji, M. A. Hasnath, Keizo Sato, Wei Sun |
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| Rok vydání: | 2009 |
| Předmět: |
Prions
Sheep Diseases Scrapie Biology Biochemistry Polymerase Chain Reaction Genotype Genetics Genetic predisposition Animals Allele Codon Molecular Biology Allele frequency Ecology Evolution Behavior and Systematics DNA Primers Polymorphism Genetic Sheep business.industry Asia Eastern General Medicine Genotype frequency Europe Livestock Restriction fragment length polymorphism business Polymorphism Restriction Fragment Length |
| Zdroj: | Biochemical genetics. 48(1-2) |
| ISSN: | 1573-4927 |
| Popis: | Allele and genotype frequency distributions of prion protein (PrP) polymorphisms at three codons, 136, 154, and 171, in East Asian sheep were determined by PCR-RFLP analysis using 553 animals from nine local breeds of the northern group and four local breeds of the southern group. Based on the genotype distribution, the risk score for scrapie was estimated. Among the local breeds, ARQ appeared predominantly (0.7701-1), followed by ARH and ARR. From such a biased allele distribution, it was difficult to ascertain the prevalent genetic relationships. A marked difference in allele frequencies between the northern and southern groups was seen (P < 0.0001). The East Asian sheep had ARQ at the highest frequency (0.8834); in European sheep it was 0.5317. According to an assessment of scrapie risk in the PrP genotype classes, the predominant ARQ/ARQ in East Asian sheep corresponded to the risk score of R4. This finding suggests that East Asian sheep have a high level of genetic susceptibility to scrapie. |
| Databáze: | OpenAIRE |
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