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Prion Protein Polymorphisms and Estimation of Risk of Scrapie in East Asian Sheep |
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| Authors: | Kenji Tsunoda Takao Namikawa Keizo Sato M. A. Hasnath Maung Maung Nyunt Heramba B. Rajbandary Chau Ba Loc Ts Zanchiv Hong Chang Wei Sun Tasi Dorji |
| Affiliation: | 1. Department of Legal Medicine, Showa University School of Medicine, Tokyo, 142-8555, Japan 2. Graduate School of Bioagricultural Science, Nagoya University, Nagoya, 464-8601, Japan 3. Faculty of Animal Husbandry, Bangladesh Agricultural University, Mymengsingh, Bangladesh 4. Livestock Breeding and Veterinary Department, Ministry of Livestock and Fisheries of Myanmar, Yangong, Myanmar 5. Department of Livestock Development and Animal Health, Ministry of Agriculture, Kathmandu, Nepal 6. Faculty of Animal Husbandry and Veterinary Medicine, Cantho University, Cantho, Vietnam 7. Institute of General and Experimental Biology, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia 8. Animal Science and Veterinary Medical College, Yanzhou University, Yanzhou, China 9. Renewable Natural Resources Research Center, Ministry of Agriculture, Bumthang, Bhutan |
| Abstract: | 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. |
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