Prion protein polymorphisms and estimation of risk of scrapie in East Asian sheep.
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.
Tsunoda
Kenji
K
Department of Legal Medicine, Showa University School of Medicine, Tokyo, Japan. tsunoken@med.showa-u.ac.jp
Namikawa
Takao
T
Sato
Keizo
K
Hasnath
M A
MA
Nyunt
Maung Maung
MM
Rajbandary
Heramba B
HB
Loc
Chau Ba
CB
Zanchiv
Ts
Ts
Chang
Hong
H
Sun
Wei
W
Dorji
Tasi
T
D000818:Animals; D003062:Codon / Q000235:genetics; D017931:DNA Primers; D005060:Europe / Q000453:epidemiology; D005202:Asia, Eastern / Q000453:epidemiology; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length; D011328:Prions / Q000235:genetics*; D012608:Scrapie / Q000453:epidemiology* / Q000235:genetics; D012756:Sheep; D012757:Sheep Diseases / Q000453:epidemiology* / Q000235:genetics
D003062:Codon; D017931:DNA Primers; D011328:Prions