Biomaterial Database

Prion-like Doppel gene polymorphisms and scrapie susceptibility in Portuguese sheep breeds. 2010

P Mesquita, and M Batista, and M R Marques, and I C Santos, and J Pimenta, and M Silva Pereira, and I Carolino, and F Santos Silva, and M C Oliveira Sousa, and L T Gama, and C M Fontes, and A E M Horta, and J A M Prates, and R M Pereira

L-INIA, Quinta da Fonte Boa, 2005-048 Vale de Santarém, Portugal.

The establishment of an association between prion protein gene (PRNP) polymorphisms and scrapie susceptibility in sheep has enabled the development of breeding programmes to increase scrapie resistance in the European Union. Intense selection for PRNP genotype may lead to correlated selection for genes linked to PRNP. We intended to investigate if any association exists between genetic variation in prion-like protein Doppel gene (PRND) and scrapie susceptibility, determined through PRNP genotyping. Sampling included 460 sheep from eight Portuguese breeds and the PRND gene coding region was analysed by multiple restriction fragment-single strand conformation polymorphism (MRF-SSCP), whereas PRNP genotyping was carried out by primer extension. A synonymous substitution (c.78G>A) was detected in codon 26 of the PRND gene, in all breeds except Churra Mondegueira. Linkage disequilibrium was found between the PRND and PRNP loci (P = 0.000). Specifically, PRND was monomorphic in the 45 animals with the more resistant ARR/ARR PRNP genotype (P = 0.003), whereas a higher frequency of PRND heterozygotes (GA) was associated with ARQ/AHQ (P = 0.029). These results constitute preliminary evidence of an association between a polymorphism in the PRND gene and scrapie susceptibility, and indicate that the possibility of undesirable consequences from widespread selection for PRNP genotype on genetic diversity and reproduction traits needs to be further investigated.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D011328	Prions	Small proteinaceous infectious particles which resist inactivation by procedures that modify NUCLEIC ACIDS and contain an abnormal isoform of a cellular protein which is a major and necessary component. The abnormal (scrapie) isoform is PrPSc (PRPSC PROTEINS) and the cellular isoform PrPC (PRPC PROTEINS). The primary amino acid sequence of the two isoforms is identical. Human diseases caused by prions include CREUTZFELDT-JAKOB SYNDROME; GERSTMANN-STRAUSSLER SYNDROME; and INSOMNIA, FATAL FAMILIAL.	Mink Encephalopathy Virus,Prion,Encephalopathy Virus, Mink
D005260	Female		Females
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D012608	Scrapie	A fatal disease of the nervous system in sheep and goats, characterized by pruritus, debility, and locomotor incoordination. It is caused by proteinaceous infectious particles called PRIONS.	Rida
D012756	Sheep	Any of the ruminant mammals with curved horns in the genus Ovis, family Bovidae. They possess lachrymal grooves and interdigital glands, which are absent in GOATS.	Ovis,Sheep, Dall,Dall Sheep,Ovis dalli
D020022	Genetic Predisposition to Disease	A latent susceptibility to disease at the genetic level, which may be activated under certain conditions.	Genetic Predisposition,Genetic Susceptibility,Predisposition, Genetic,Susceptibility, Genetic,Genetic Predispositions,Genetic Susceptibilities,Predispositions, Genetic,Susceptibilities, Genetic