Abstract
Immunologically important genes of the major histocompatibility complex (MHC) have been characterized in a number of avian species with the general finding of considerable variation in size and structural organization among organisms. A range of nonpasserines which represent early-diverging Neoave lineages have been described as having only one MHC class II β locus potentially leading to the conclusion that this is the ancestral condition. Here, we examine the monotypic, early-diverging, critically endangered kakapo, Strigops habroptilus, for allelic variation at MHC class II β exon 2, as part of species’ recovery efforts. We found two to four confirmed sequence variants per individual indicating the presence of more than one MHC class II β locus. Given the kakapo’s basal evolutionary status, evidence for multiple MHC class II β loci seems to counter the proposed mono-locus history of modern birds. However, MHC gene duplication, maintenance, and loss among and within bird species may confound avian relationships making it difficult to elucidate the ancestral state. This study adds essential data for disentangling the course of MHC structural evolution in birds.
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Acknowledgments
Thanks to the National Kakapo Team members for collecting the blood samples for DNA analysis. We thank P. Jameson and N. Gemmell for use of laboratory space at the University of Canterbury at the beginning of the study. We are grateful to F. Robertson for assistance with lab work at Otago University and C. Grueber for helpful comments on earlier drafts of the manuscript. Cloning of the kakapo, kea, and kaka MHC was done under ERMA application GMD07039. Funding for this research was provided by the Department of Conservation Kakapo Recovery Group, McKee Trust (funding to BCR) and the Allan Wilson Centre (funding to IGJ). GK was supported by a University of Otago PhD Scholarship.
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Knafler, G.J., Fidler, A., Jamieson, I.G. et al. Evidence for multiple MHC class II β loci in New Zealand’s critically endangered kakapo, Strigops habroptilus . Immunogenetics 66, 115–121 (2014). https://doi.org/10.1007/s00251-013-0750-5
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DOI: https://doi.org/10.1007/s00251-013-0750-5