Selection from parasites favours immunogenetic diversity but not divergence among locally adapted host populations

M. Tobler, M. Plath, R. Riesch, I. Schlupp, A.V. Grasse, G. Munimanda, C. Setzer, D. Penn, Y. Moodley, Journal of Evolutionary Biology 27 (2014) 960–974.

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Journal Article | Published | English
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Abstract
The unprecedented polymorphism in the major histocompatibility complex (MHC) genes is thought to be maintained by balancing selection from parasites. However, do parasites also drive divergence at MHC loci between host populations, or do the effects of balancing selection maintain similarities among populations? We examined MHC variation in populations of the livebearing fish Poecilia mexicana and characterized their parasite communities. Poecilia mexicana populations in the Cueva del Azufre system are locally adapted to darkness and the presence of toxic hydrogen sulphide, representing highly divergent ecotypes or incipient species. Parasite communities differed significantly across populations, and populations with higher parasite loads had higher levels of diversity at class II MHC genes. However, despite different parasite communities, marked divergence in adaptive traits and in neutral genetic markers, we found MHC alleles to be remarkably similar among host populations. Our findings indicate that balancing selection from parasites maintains immunogenetic diversity of hosts, but this process does not promote MHC divergence in this system. On the contrary, we suggest that balancing selection on immunogenetic loci may outweigh divergent selection causing divergence, thereby hindering host divergence and speciation. Our findings support the hypothesis that balancing selection maintains MHC similarities among lineages during and after speciation (trans-species evolution).
Publishing Year
Date Published
2014-04-12
Journal Title
Journal of Evolutionary Biology
Acknowledgement
This study was funded by grants from the National Science Foundation (NSF) to MT (IOS-1121832) and IS (DEB-0743406) and from the German Science Foundation (DFG; PL 470/1-2) and ‘LOEWE − Landesoffensive zur Entwicklung wissenschaftlich-ökonomischer Exzellenz’ of Hesse's Ministry of Higher Education, Research, and the Arts, to MP.
Volume
27
Issue
5
Page
960 - 974
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Tobler M, Plath M, Riesch R, et al. Selection from parasites favours immunogenetic diversity but not divergence among locally adapted host populations. Journal of Evolutionary Biology. 2014;27(5):960-974. doi:10.1111/jeb.12370
Tobler, M., Plath, M., Riesch, R., Schlupp, I., Grasse, A. V., Munimanda, G., … Moodley, Y. (2014). Selection from parasites favours immunogenetic diversity but not divergence among locally adapted host populations. Journal of Evolutionary Biology, 27(5), 960–974. https://doi.org/10.1111/jeb.12370
Tobler, Michael, Martin Plath, Rüdiger Riesch, Ingo Schlupp, Anna V Grasse, Gopi Munimanda, C Setzer, Dustin Penn, and Yoshan Moodley. “Selection from Parasites Favours Immunogenetic Diversity but Not Divergence among Locally Adapted Host Populations.” Journal of Evolutionary Biology 27, no. 5 (2014): 960–74. https://doi.org/10.1111/jeb.12370.
M. Tobler et al., “Selection from parasites favours immunogenetic diversity but not divergence among locally adapted host populations,” Journal of Evolutionary Biology, vol. 27, no. 5, pp. 960–974, 2014.
Tobler M, Plath M, Riesch R, Schlupp I, Grasse AV, Munimanda G, Setzer C, Penn D, Moodley Y. 2014. Selection from parasites favours immunogenetic diversity but not divergence among locally adapted host populations. Journal of Evolutionary Biology. 27(5), 960–974.
Tobler, Michael, et al. “Selection from Parasites Favours Immunogenetic Diversity but Not Divergence among Locally Adapted Host Populations.” Journal of Evolutionary Biology, vol. 27, no. 5, Wiley-Blackwell, 2014, pp. 960–74, doi:10.1111/jeb.12370.

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