Abstract
Zoonotic visceral leishmaniasis (VL) is a disease of dogs, humans and other animals caused by the intracellular macrophage parasite Leishmania infantum. We examined the relationship between DLA class II alleles (DRB1, DQA1, DQB1) and the course of infection in a cohort of Brazilian mongrel dogs exposed to natural L. infantum infection. DLA alleles were typed by sequence-based typing. DLA-DRB1 genotype was significantly associated with levels of anti-Leishmania IgG and parasite status assessed by PCR. Dogs with DLA-DRB1*01502 had higher levels of specific IgG and an increased risk of being parasite positive compared with dogs without this allele, controlling for other alleles and significant variables. No significant associations were seen for DLA-DQA1 or DLA-DQB1 alleles. These results suggest that the DLA-DRB1 locus plays a role in determining susceptibility to canine VL. As the domestic dog is the main reservoir for human infection, the identification of genetic factors influencing canine resistance or susceptibility to VL may provide insights into the immunology and potential control through vaccination of VL.
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Acknowledgements
We thank E. Ishikawa, M.R.S. Magalhaes, A.J. Monteiro, P. Ramos, R. Baia, L. Salvador, R.N. Pires, A.F. Martins, J. Blackwell, C. Peacock, M.J. Day, P. Kaye and S. Davidson for help in the field and laboratory. J. Travassos da Rosa, R. Lainson and J. Shaw provided facilities in the Instituto Evandro Chagas. The field study was funded by the Wellcome Trust. The study complies with the current laws of the countries in which it was carried out.
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Quinnell, R.J., Kennedy, L.J., Barnes, A. et al. Susceptibility to visceral leishmaniasis in the domestic dog is associated with MHC class II polymorphism. Immunogenetics 55, 23–28 (2003). https://doi.org/10.1007/s00251-003-0545-1
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DOI: https://doi.org/10.1007/s00251-003-0545-1