Abstract
Ovine pulmonary adenocarcinoma (OPA) and Maedi–Visna (Maedi) are two chronic respiratory diseases of retroviral origin which occur worldwide. It is known that different host genetic factors influence the outcome of viral infections. To determine if variation in the Mhc-DRB1 gene was associated with progression to these ovine diseases, sheep lungs with and without OPA and Maedi lesions were collected. A sequence-based method was applied and 40 different alleles were detected in the sample analysed. In the allele-by-allele association analysis, allele DRB1*0325 had a significant association with susceptibility to Maedi (P = 0.045). For OPA, DRB1*0143 and DRB1*0323 were significantly associated with susceptibility (P = 0.024 and P = 0.029), and allele DRB1*0702 was significantly associated with resistance (P = 0.012). Based on these results, the Mhc-DRB1 alleles were classified by effect in three categories—susceptible (S), resistant (R) and neutral (N)—and animals were reassigned the genotypes as S/S, S/R, S/N, R/R, R/N and N/N. In a second analysis, penalised logistic regression models including a flock effect were run. In Maedi, significant association was detected for the N/S heterozygote (P = 0.0007), but not for the S/S homozygote, probably as a result of the low number of S/S animals. In OPA, association was detected for both the S/S and R/R homozygotes (P = 0.005 and P = 0.047). This allele grouping method may be applied in association studies with highly variable genes. This is the first study demonstrating significant associations between sheep Mhc-DRB1 alleles and susceptibility to OPA and Maedi. Therefore, both diseases are suitable candidates for more comprehensive genetic studies.
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Acknowledgements
We acknowledge Dr. Josune Arranz, Felisa Arrese and Lourdes Mintegi for providing animals and data for the study and Adoración Cortés, Helena Camino and Lía Arana from the Veterinary Services and Auxiliary Team from MAFRIDO for providing samples and required information. We wish to thank two anonymous referees for their contribution to the improvement of the manuscript. This work was funded by a grant from the Instituto Nacional de Investigación y Tecnología Agraría y Alimentaria (INIA) RTA02-003-C2. A. Larruskain and K. García-Etxebarria are recipients of the University of the Basque Country (UPV/EHU) pre-doctoral grants. Esmeralda Minguijón’s salary is partially covered by the INIA program for incorporation for Ph.D. graduates into agricultural research centres.
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Larruskain, A., Minguijón, E., García-Etxebarria, K. et al. MHC class II DRB1 gene polymorphism in the pathogenesis of Maedi–Visna and pulmonary adenocarcinoma viral diseases in sheep. Immunogenetics 62, 75–83 (2010). https://doi.org/10.1007/s00251-009-0419-2
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DOI: https://doi.org/10.1007/s00251-009-0419-2