Generation and maintenance of diversity in the cattle MHC class I region (original) (raw)
Abstract
Major histocompatibility complex (MHC) class I genes play a crucial role in the immune defence against intracellular pathogens. An important evolutionary strategy is to generate and maintain a high level of diversity in these genes. Humans express three highly polymorphic classical MHC class I genes (HLA-A, HLA-B and HLA-C). In contrast, some species, for example rat and rhesus macaque, maintain diversity by generation of haplotypes that vary considerably with regard to the number and combination of transcribed genes. Cattle appear to use both strategies. We show that various combinations of six apparently classical genes, three of which are highly polymorphic, are transcribed on different haplotypes. Although additional sequences were identified in both cDNA and gDNA, it was not possible to assign them to any of these defined genes. Most were highly divergent or were non-classical class I genes. Thus, we found little evidence for frequent duplication and deletion of classical class I genes as reported in some other species. However, the maintenance of class I diversity in cattle may involve limited gene shuffling and deletion, possibly as a result of unequal crossing-over within the class I region.
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Acknowledgements
This work was supported by the Biotechnology and Biological Sciences Research Council, UK. We would like to thank the staff of the IAH farm, Helen Prentice for help with sampling and Alison Burrells for help with sequence analysis. The experiments carried out in this study comply with UK law.
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Authors and Affiliations
- Immunology Division, Institute for Animal Health, Compton, RG20 7NN, UK
James Birch & Shirley A. Ellis - Division of Animal Production and Public Health, Institute for Comparative Medicine, Faculty of Veterinary Medicine, Glasgow University, Bearsden Road, Glasgow, G61 1QH, UK
Lisa Murphy - The Centre for Tropical Veterinary Medicine, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Roslin, Midlothian, EH25 9RG, UK
Niall D. MacHugh
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Correspondence toShirley A. Ellis.
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The first two authors made an equal contribution to this work.
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Birch, J., Murphy, L., MacHugh, N.D. et al. Generation and maintenance of diversity in the cattle MHC class I region.Immunogenetics 58, 670–679 (2006). https://doi.org/10.1007/s00251-006-0137-y
- Received: 10 April 2006
- Accepted: 31 May 2006
- Published: 29 June 2006
- Issue Date: August 2006
- DOI: https://doi.org/10.1007/s00251-006-0137-y