Surveillance of prion protein (PrP9 gene polymorphisms in Turkish native sheep breeds

Uzun, Begüm
Scrapie is an infectious fatal disease of sheep and goats which affects the central nervous system. In the present study, samples of 14 native Turkish sheep breeds (n=655) were analyzed with respect to their polymorphisms of PrP gene (at codons: 136, 141, 154 and 171) and their classical and atypical scrapie risk levels were identified. Turkish sheep are found to have the highest PrP genetic variability with 13 classical scrapie alleles and 14 atypical scrapie alleles compared to all previous studies. Classical scrapie-susceptible and wild-type ARQ allele was found as the most frequent allele in Turkish sheep examined. The most classical scrapie-susceptible allele, VRQ was detected at low frequencies in 5 of the breeds (Çine Çaparı, Dağlıç, Kıvırcık, Karayaka and Gökçeada). One novel allele (TL141HQ) was observed in Sakız breed for the first time in this study. It was found that most of the classical scrapie genotypes belong to R3 risk group, whereas atypical scrapie genotypes belonging to zero (0) and one (1) risk groups were frequently seen in sheep analyzed. In other words, Turkish sheep is found to have intermediate risk of classical scrapie and low atypical scrapie risk, in general. The data from the current study may help to establish a breeding program for classical scrapie control in Turkey and will be beneficial for both the animal and public health in the country. In addition, the outcomes of the study will fill the gap which is present in the geographic distribution data of PrP gene polymorphisms in Eurasia.


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Prion diseases are a group of fatal neurodegenerative disorders, characterized by the accumulation of prions in the central nervous system. The pathogenic prion (PrPSc) possesses the capability to convert the host-encoded cellular isoform of the prion protein, PrPC, into nascent PrPSc. The present work aims at providing novel insight into cellular response upon prion infection evidenced by synchrotron radiation infrared microspectroscopy (SR-IRMS). This non-invasive, label-free analytical technique was empl...
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COVID-19 is an infectious disease caused by SARS-CoV-2. The virus was first detected in Wuhan, China in late 2019, and the outbreak was declared a pandemic in January 2020 by WHO, and continues to spread worldwide. As of July 2022, more than 575 million confirmed cases have been detected all over the world, and more than 6 million people died from the disease. One of the most important public health measures in combating the spread of infectious diseases is vaccination. Despite the existence of rapidly deve...
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Stroke is the third leading cause of death worldwide and results in serious disabilities. Cytochrome P450 1A1 gene (CYP1A1) is a highly polymorphic gene encoding its corresponding xenobiotic metabolizing enzyme which is responsible from the metabolism of carcinogenic polycyclic aromatic hydrocarbons (PAHs) that are engaged with the formation of free radicals. Atherosclerosis is a major cause of ischemic stroke and this pathology may be associated with the disruption of vascular homeostasis due to the format...
Citation Formats
B. Uzun, “Surveillance of prion protein (PrP9 gene polymorphisms in Turkish native sheep breeds,” M.S. - Master of Science, Middle East Technical University, 2012.