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Ianella P, McManus C, Caetano A, Paiva S. PRNP haplotype and genotype frequencies in Brazilian sheep: Issues for conservation and breeding programs. Res Vet Sci 2012; 93:219-25. [DOI: 10.1016/j.rvsc.2011.06.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Revised: 05/12/2011] [Accepted: 06/20/2011] [Indexed: 10/17/2022]
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2
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Lühken G. Genetic testing for phenotype-causing variants in sheep and goats. Mol Cell Probes 2012; 26:231-7. [PMID: 22554501 DOI: 10.1016/j.mcp.2012.04.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Revised: 04/10/2012] [Accepted: 04/12/2012] [Indexed: 11/19/2022]
Abstract
This review gives an overview on ovine and caprine defects/disorders, disease predispositions, production traits and coat colours for which causal gene variants are known. Most phenotypes are inherited autosomal-recessive or dominant and in the majority are caused by single nucleotide substitutions or deletions. Causative sequence variants mainly were identified by sequencing candidate genes in the past, and recently also by whole genome analysis using the ovine 50k SNP chip. While PCR-fragment length polymorphism analyses were developed for the majority of causative sequence variants, other low- to medium-throughput PCR-based methods as PCR-single strand conformation analysis and allele-specific PCR were also established frequently. For processing large sample numbers, high-throughput methods as MALDI-ToF MS or real-time PCR are available for some gene variants. Further progress in development of ovine and caprine genome sequences and SNP chips will be beneficial for the discovery of additional causative variants in these two species.
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Affiliation(s)
- Gesine Lühken
- Department of Animal Breeding and Genetics, Justus-Liebig University of Giessen, Ludwigstrasse 21B, 35390 Giessen, Germany.
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Ianella P, McManus CM, Paiva SR, Caetano AR. Adaptation of a low-cost medium-throughput genotyping system for ovine prion protein gene polymorphims associated with scrapie. GENETICS AND MOLECULAR RESEARCH 2011; 10:3180-5. [PMID: 22194174 DOI: 10.4238/2011.december.20.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Resistance and susceptibility to scrapie in sheep have been associated with SNPs located at codons 136, 154 and 171 of the prion protein (PRNP) gene. Many countries have sheep breeding programs selecting for resistance to scrapie based on the genotyping of these SNPs. We adapted a fast and robust method for genotyping sheep flocks for these polymorphisms, with reduced costs. Ninety-six samples were genotyped using an adapted SNaPshot PRNP assay, and the results were checked by resequencing. The results showed 100% concordance, using a method that reduces genotyping costs by 70%, by reducing reagent concentrations in the three main steps of the assay (amplicon purification, base extension and final cleanup). This cost reduction should contribute to the development of selection criteria based on PRNP genotyping in countries where assay costs are an important limiting factor.
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Affiliation(s)
- P Ianella
- Embrapa Recursos Genéticos e Biotecnologia, Brasília, DF, Brasil.
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Heaton MP, Leymaster KA, Kalbfleisch TS, Freking BA, Smith TPL, Clawson ML, Laegreid WW. Ovine reference materials and assays for prion genetic testing. BMC Vet Res 2010; 6:23. [PMID: 20433741 PMCID: PMC2876147 DOI: 10.1186/1746-6148-6-23] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2009] [Accepted: 04/30/2010] [Indexed: 11/10/2022] Open
Abstract
Background Genetic predisposition to scrapie in sheep is associated with several variations in the peptide sequence of the prion protein gene (PRNP). DNA-based tests for scoring PRNP codons are essential tools for eradicating scrapie and for evaluating rare alleles for increased resistance to disease. In addition to those associated with scrapie, there are dozens more PRNP polymorphisms that may occur in various flocks. If not accounted for, these sites may cause base-pair mismatching with oligonucleotides used in DNA testing. Thus, the fidelity of scrapie genetic testing is enhanced by knowing the position and frequency of PRNP polymorphisms in targeted flocks. Results An adaptive DNA sequencing strategy was developed to determine the 771 bp PRNP coding sequence for any sheep and thereby produce a consensus sequence for targeted flocks. The strategy initially accounted for 43 known polymorphisms and facilitates the detection of unknown polymorphisms through an overlapping amplicon design. The strategy was applied to 953 sheep DNAs from multiple breeds in U.S. populations. The samples included two sets of reference sheep: one set for standardizing PRNP genetic testing and another set for discovering polymorphisms, estimating allele frequencies, and determining haplotype phase. DNA sequencing revealed 16 previously unreported polymorphisms, including a L237P variant on the F141 haplotype. Two mass spectrometry multiplex assays were developed to score five codons of interest in U.S. sheep: 112, 136, 141, 154, and 171. Reference tissues, DNA, trace files, and genotypes from this project are publicly available for use without restriction. Conclusion Identifying ovine PRNP polymorphisms in targeted flocks is critical for designing efficient scrapie genetic testing systems. Together with reference DNA panels, this information facilitates training, certification, and development of new tests and knowledge that may expedite the eradication of sheep scrapie.
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Affiliation(s)
- Michael P Heaton
- USDA, ARS, United States Meat Animal Research Center State Spur 18D, Clay Center, NE 68933, USA.
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Co-existence of classical scrapie and Nor98 in a sheep from an Italian outbreak. Res Vet Sci 2009; 88:478-85. [PMID: 20031179 DOI: 10.1016/j.rvsc.2009.11.015] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2009] [Revised: 11/23/2009] [Accepted: 11/25/2009] [Indexed: 11/22/2022]
Abstract
Nor98 is an atypical scrapie strain characterized by a molecular pattern and brain distribution of the pathological prion protein (PrP(Sc)) different from classical scrapie. In Italy, 69 atypical cases have been identified so far and all were characterized as Nor98 strain. In this paper we report an unusual case in a sheep which showed immunohistochemical and molecular features of PrP(Sc) different from the other atypical cases. The sheep was from an outbreak where the index and the other four cases were affected by classical scrapie. Histopathological, immunohistochemical and Western blot analyses on the brain of the unusual case revealed the simultaneous presence of pathological features characteristic of Nor98 and classical scrapie. Interestingly, the prevalent disease phenotype in the brainstem was classical scrapie-like, while in the cerebral cortex and cerebellum the Nor98 phenotype was dominant. The sub-mandibular lymph node was positive and showed a PrP(Sc) molecular pattern referable to classical scrapie. The PrP genotype was AL(141)RQ/AF(141)RQ. Taken together, the occurrence of classical scrapie in the outbreak, the PrP genotype, the involvement of different cellular targets in the brain and the pathological and molecular PrP(Sc) features observed suggest that this unusual case may result from the co-existence of Nor98 and classical scrapie.
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Prion protein genotypes of Italian sheep breeds with lysine-171 and phenylalanine-141 detection. Vet Microbiol 2009; 137:18-23. [DOI: 10.1016/j.vetmic.2008.12.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2008] [Revised: 12/05/2008] [Accepted: 12/08/2008] [Indexed: 11/19/2022]
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Guan F, Pan L, Shi GQ, Liu SR, Yang LG. [Research progress on genetic diversity of sheep PRNP and resistance breeding]. YI CHUAN = HEREDITAS 2009; 31:137-41. [PMID: 19273420 DOI: 10.3724/sp.j.1005.2009.00137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Prion protein (PrP) is a pathogeny identified in recent years, which infects both mankind and other mammals. It has been proved that PrP is a sole protein able to duplicate and propagate with itself. PrP can express in many tissues and has important physiological functions in many species of animals. The conformation change of PrP is the origin of transmissible spongiform encephalopathies (TSEs). It has been proved that the sheep genetic diversity of prion protein gene (PRNP) is significantly associated with the resistance to scrapie. In this review, the evidence of association between polymorphisms of PRNP and resistance or susceptibility to scrapie and its effects on reproduction and performance traits were focused. The aim is to provide theory guidance for sheep breeding resistant to disease.
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Affiliation(s)
- Feng Guan
- College of Life Sciences, China Jiliang University, Hangzhou 310018, China.
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Pongolini S, Bergamini F, Bassi S. A new genotyping strategy for efficient scoring of closely positioned SNPs in the ovine prion protein gene. Mol Cell Probes 2009; 23:122-5. [PMID: 19272344 DOI: 10.1016/j.mcp.2009.01.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2008] [Revised: 01/05/2009] [Accepted: 01/08/2009] [Indexed: 10/21/2022]
Abstract
Amino-acid polymorphisms of the ovine prion protein have been known to influence susceptibility to scrapie for many years. Recently, a role in both classical and atypical scrapie was assigned to new mutations, increasing the overall number of polymorphisms of interest for breeding plans. Besides, the high number and density of polymorphisms in the prion protein gene (PrP) and the presence of unusual mutations in some breeds hampers genotyping methods, making multiplexing difficult and sometimes compromising analytical results. We developed a multiplex genotyping method for the ovine PrP that overcomes the limitations posed by the high number and density of the polymorphisms to interrogate. Nine primers were designed to be compatible in a single primer-extension reaction developed for routine genotyping, with the capacity to identify the following polymorphisms: A136V, M137T, L141F, I142K, R154H, Q171R, Q171H, Q171K and N176K. Site-specific mutations were inserted in primer sequences in order to prevent extension of reciprocally complementary primers. Complete accuracy and repeatability of the assay was assessed with reference to 97 sequenced samples. The presented method constitutes an improved tool for ovine PrP genotyping and a general strategy for the use of primer extension in a genetic context of high density of polymorphisms.
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Affiliation(s)
- Stefano Pongolini
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia-Romagna, Via E. Diena, 16 - 41100 Modena, Italy.
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Alvarez L, Arranz JJ, San Primitivo F. Identification of a new leucine haplotype (ALQ) at codon 154 in the ovine prion protein gene in Spanish sheep. J Anim Sci 2008; 84:259-65. [PMID: 16424251 DOI: 10.2527/2006.842259x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Genetic susceptibility to scrapie is closely linked to variations at codons 136, 154, and 171 of the prion protein (PRNP) gene. This association between the PRNP genotype and susceptibility to scrapie is the basis of breeding programs for scrapie resistance in different countries. In this paper, we describe the method used with 2 Spanish dairy sheep breeds (Churra and Castellana) to ascertain the initial status of protection against scrapie as a first step toward adapting their breeding schemes to include resistance as a complementary selection criterion. The procedure for genotype identification is based on multiplex minisequencing methodology and has been shown to be accurate, easy to interpret, and to have a medium throughput. The frequency of the ARQ allele was similar in the 2 populations at nearly 70%. The ARR allele, associated with resistance in the homozygous state, reaches around 23% in Churras and nearly 20% in Castellanas. The high-risk VRQ allele appeared at a relatively low frequency in both breeds. No other haplotypes were found in these 2 breeds. Furthermore, in this screening we found a new allele carrying leucine at codon 154. This new genetic variant might play a role in susceptibility to scrapie because codon 154 belongs to a region considered to have an important role in conformational conversion of the cellular to the pathogenic protein.
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Affiliation(s)
- L Alvarez
- Departamento de Producción Animal I, Universidad de León, 24071 León, Spain
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Benkel BF, Valle E, Bissonnette N, Hossain Farid A. Simultaneous detection of eight single nucleotide polymorphisms in the ovine prion protein gene. Mol Cell Probes 2007; 21:363-7. [PMID: 17590312 DOI: 10.1016/j.mcp.2007.05.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2007] [Revised: 04/23/2007] [Accepted: 05/01/2007] [Indexed: 10/23/2022]
Abstract
Amino acid polymorphisms in the prion protein gene (PrP) affect the susceptibility of sheep to scrapie, a transmissible spongiform encephalopathy (TSE). In particular, amino acid substitutions at codons 136, 154 and 171 of the ovine PrP gene are associated with different degrees of susceptibility to the classical form of scrapie, caused by 'typical' scrapie strains. Existing genotyping tests for scrapie susceptibility normally interrogate only the single nucleotide polymorphisms (SNPs) most relevant to 'typical' strains. Recently, however, a number of novel variants of the scrapie agent have been discovered. The ability of these new, 'atypical' scrapie variants to infect sheep that are resistant to 'typical' variants has raised concerns about the reduction in genetic variability that may result from intense selection for resistance to classical scrapie. Furthermore, a growing interest in a potential role for specific PrP genotypes in modulating performance traits is also driving a move toward more extensive characterization of haplotypes at the PrP locus. Here, we describe a single-tube method for the interrogation of eight SNPs within seven codons (112, 136, 141, 154, 171, 231 and 241) of the ovine PrP gene. This method is as accurate as sequencing, yet more affordable, and can easily be automated for high-throughput sample screening. Moreover, it can be modified to accommodate genetic variations that are found in local and heritage breeds.
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Affiliation(s)
- Bernhard F Benkel
- Department of Plant and Animal Sciences, Nova Scotia Agricultural College, Truro, NS, Canada B2N 5E3.
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French DJ, Jones D, McDowell DG, Thomson JA, Debenham PG. Analysis of multiple single nucleotide polymorphisms closely positioned in the ovine PRNP gene using linear fluorescent probes and melting curve analysis. BMC Infect Dis 2007; 7:90. [PMID: 17683552 PMCID: PMC1994165 DOI: 10.1186/1471-2334-7-90] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2006] [Accepted: 08/03/2007] [Indexed: 11/17/2022] Open
Abstract
Background Resistance and susceptibility to scrapie has been associated with single nucleotide polymorphisms located within codons 136, 154 and 171 of the ovine prion protein gene (PRNP). Dual-labelled HyBeacon probes were developed to analyse single and clustered polymorphisms within these and neighbouring codons. Methods Extracted DNAs and unpurified blood samples were genotyped with respect to polymorphisms in PRNP codons 136, 141, 154 and 171. PCR amplicons were investigated using a LightTyper instrument, measuring the stability of probe/target hybridisation through peak melting temperatures and determining the sequence of nucleotides at polymorphic sites. Results The performance of HyBeacon assays was evaluated in a validation study comparing genotypes with those obtained using a primer extension assay (Sequenom MassEXTEND) analysed on a MALDI-ToF mass spectrometer. Over 12,000 sheep samples were successfully genotyped, reliably detecting A136, V136, T136, T137, L141, F141 R154, H154, L168, R171, Q171, H171 and K171 sequence variants using only 4 HyBeacon probes. Conclusion HyBeacon assays provide an extremely robust and accurate method for the analysis of single and clustered PRNP polymorphisms in a high-throughput format. The flexibility of the diagnostic tests ensures that samples are correctly genotyped even in the presence of additional sequence variations that flank the polymorphisms of interest. Such sequence variations may also be neutralised using universal bases such as 5-nitroindole if required.
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Affiliation(s)
| | - Dominic Jones
- LGC, Queens Road, Teddington, Middlesex, TW11 0LY, UK
| | | | - Jim A Thomson
- LGC, Queens Road, Teddington, Middlesex, TW11 0LY, UK
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Zhou H, Hickford JGH, Fang Q. Technical note: determination of alleles of the ovine PRNP gene using PCR-single-strand conformational polymorphism analysis. J Anim Sci 2007; 83:745-9. [PMID: 15753327 DOI: 10.2527/2005.834745x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Susceptibility to scrapie in sheep is linked to variation at codons 136, 154, and 171 in the host prion protein gene (PRNP). A number of techniques are available for detecting these polymorphisms, but none allow for a rapid and accurate determination of genotype. Here we describe PCR coupled with single-strand conformational polymorphism (SSCP) analysis, which allows for the accurate identification of ovine PRNP alleles. A gene region including codons 136 to 171 was amplified by PCR, and the amplimers were then denatured and subjected to electrophoresis in a nondenaturing polyacrylamide gel. Nine unique SSCP patterns, representing nine different alleles of the ovine PRNP gene, could be resolved. A new polymorphism (I/T) at codon 142 also was detected. The profiles produced by SSCP allowed for the accurate differentiation of PRNP alleles and could be employed to genotype PRNP in sheep.
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Affiliation(s)
- H Zhou
- Cell Biology Group, Agriculture and Life Sciences Division, Lincoln University, Canterbury, New Zealand
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Vaccari G, D'Agostino C, Nonno R, Rosone F, Conte M, Di Bari MA, Chiappini B, Esposito E, De Grossi L, Giordani F, Marcon S, Morelli L, Borroni R, Agrimi U. Prion protein alleles showing a protective effect on the susceptibility of sheep to scrapie and bovine spongiform encephalopathy. J Virol 2007; 81:7306-9. [PMID: 17442723 PMCID: PMC1933282 DOI: 10.1128/jvi.02880-06] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The susceptibility of sheep to classical scrapie and bovine spongiform encephalopathy (BSE) is mainly influenced by prion protein (PrP) polymorphisms A136V, R154H, and Q171R, with the ARR allele associated with significantly decreased susceptibility. Here we report the protective effect of the amino acid substitution M137T, I142K, or N176K on the ARQ allele in sheep experimentally challenged with either scrapie or BSE. Such observations suggest the existence of additional PrP alleles that significantly decrease the susceptibility of sheep to transmissible spongiform encephalopathies, which may have important implications for disease eradication strategies.
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Affiliation(s)
- Gabriele Vaccari
- Istituto Superiore di Sanità, Department of Food Safety and Veterinary Public Health, Viale Regina Elena 299, 00161 Rome, Italy.
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Schütz E, Scharfenstein M, Brenig B. Genotyping of ovine prion protein gene (PRNP) variants by PCR with melting curve analysis. Clin Chem 2006; 52:1426-9. [PMID: 16690731 DOI: 10.1373/clinchem.2006.069666] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Scrapie is the transmissible spongiform encephalopathy in sheep. Because genetic variants of the ovine PrP gene (PRNP) can be associated with disease risk, the European Union initiated programs to eradicate high-risk PRNP genotypes from sheep livestock. For this purpose, reliable and cost-effective genotyping is needed. METHODS We amplified DNA to cover the 3 risk codons in exon 3 encoding amino acids 136, 154, and 171. Amplicons were mixed with dye-labeled probe sets, and melting curves were recorded in a LightCycler by use of color and temperature multiplexing. Probe design was based on thermodynamic calculations to ensure unequivocal results for the 3 codons of interest, taking the additional F141 and T137 sequence variants into account. RESULTS The fluorescence resonance energy transfer (FRET) method, when compared with sequencing, gave exactly the predicted melting temperatures for all possible genotypes. When we validated the method with samples from official certification programs, it showed completely matching results. Turnaround time was approximately 5 h after receipt of a whole-blood sample. The method detected the rare sequence variants T137 and F141, which were clearly distinguishable from the other known genotypes by melting curve analysis. One scrapie sheep was ARR/ARR, which is considered the haplotype with the lowest risk. CONCLUSIONS The FRET-based PRNP genotyping method for sheep is rapid and can differentiate all genotypes at each locus in 1 capillary. The assay is fast and has lower costs than restriction fragment length polymorphism analysis or sequencing.
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Affiliation(s)
- Ekkehard Schütz
- Institute of Veterinary Medicine, Georg-August-University, Burckhardtweg 2, 37077 Göttingen, Germany.
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Goldmann W, Baylis M, Chihota C, Stevenson E, Hunter N. Frequencies ofPrPgene haplotypes in British sheep flocks and the implications for breeding programmes. J Appl Microbiol 2005; 98:1294-302. [PMID: 15916643 DOI: 10.1111/j.1365-2672.2005.02568.x] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS To analyse the frequencies of prion (PrP) gene haplotypes in UK sheep flocks and evaluate their relevance to transmissible spongiform encephalopathies (TSEs) and TSE resistance breeding programmes in sheep. METHODS AND RESULTS Genomic DNA isolated from sheep blood was PCR amplified for the coding region of the PrP gene and then sequenced. This study has analysed the sequence of PrP between codons 110 and 245 in 6287 ARQ haplotypes revealing a total of eight variant sequences, which represent a higher than expected 41% of all ARQ haplotypes. The additional PrP gene dimorphisms were M112T, L141F, M137T, H143R, H151C, P168L, Q175E and P241S. CONCLUSION The results do not suggest a correlation between the occurrence of a specific ARQ haplotype and the scrapie disease status of a flock. The ARQ haplotype variability appears to be different in the UK sheep flocks compared with sheep flocks from outside the UK. SIGNIFICANCE AND IMPACT OF THE STUDY Additional PrP dimorphisms may impact on the methodologies used for standard PrP genotyping in sheep breeding programmes. Some of these polymorphisms were found with significant frequencies in the UK sheep flocks and should therefore be considered in breeding programmes.
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Affiliation(s)
- W Goldmann
- Neuropathogenesis Unit, Institute for Animal Health, Ogston Building, West Mains Road, Edinburgh EH9 3JF, Scotland, UK.
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