Abstract
There have been significant evolutionary pressures on the chicken during both its speciation and its subsequent domestication by man. Infectious diseases are expected to have exerted strong selective pressures during these processes. Consequently, it is likely that genes associated with disease susceptibility or resistance have been subject to some form of selection. Two genes involved in the immune response (interferon-γ and interleukin 1-β) were selected for sequencing in diverse chicken populations from Pakistan, Sri Lanka, Bangladesh, Kenya, Senegal, Burkina Faso and Botswana, as well as six outgroup samples (grey, green, red and Ceylon jungle fowl and grey francolin and bamboo partridge). Haplotype frequencies, tests of neutrality, summary statistics, coalescent simulations and phylogenetic analysis by maximum likelihood were used to determine the population genetic characteristics of the genes. Networks indicate that these chicken genes are most closely related to the red jungle fowl. Interferon-γ had lower diversity and considerable coding sequence conservation, which is consistent with its function as a key inflammatory cytokine of the immune response. In contrast, the pleiotropic cytokine interleukin 1-β had higher diversity and showed signals of balancing selection moderated by recombination, yielding high numbers of diverse alleles, possibly reflecting broader functionality and potential roles in more diseases in different environments.



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Acknowledgements
This work is supported by Government of Ireland Department of Agriculture FIRM grant 04/R + D/D/295. We would like to thank the Department of Ornithology and Mammalogy, Californian Academy of Sciences (San Francisco, USA) and Donal Campion, Wallslough Farm (Co. Kilkenny, Ireland) for bird samples and Karsten Hokamp (Trinity College, University of Dublin) for help in implementing LDhat.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00251-009-0367-x
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Downing, T., Lynn, D.J., Connell, S. et al. Contrasting evolution of diversity at two disease-associated chicken genes. Immunogenetics 61, 303–314 (2009). https://doi.org/10.1007/s00251-009-0359-x
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DOI: https://doi.org/10.1007/s00251-009-0359-x