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Título: | MHC Adaptive Divergence between Closely Related and Sympatric African Cichlids |
Autor: | Blais, Jonatan; Rico, Ciro CSIC ORCID; Van Oosterhout, Cock; Cable, Joanne; Turner, George F.; Bernatchez, Louis | Fecha de publicación: | 15-ago-2007 | Editor: | Public Library of Science | Citación: | PLoS ONE. 2007; 2(8): e734 | Resumen: | [Background] The haplochromine cichlid species assemblages of Lake Malawi and Victoria represent some of the most
important study systems in evolutionary biology. Identifying adaptive divergence between closely-related species can provide
important insights into the processes that may have contributed to these spectacular radiations. Here, we studied a pair of
sympatric Lake Malawi species, Pseudotropheus fainzilberi and P. emmiltos, whose reproductive isolation depends on
olfactory communication. We tested the hypothesis that these species have undergone divergent selection at MHC class II
genes, which are known to contribute to olfactory-based mate choice in other taxa. [Methodology/Principal Findings] Divergent selection on functional alleles was inferred from the higher genetic divergence at putative antigen binding sites (ABS) amino acid sequences than at putatively neutrally evolving sites at intron 1, exon 2 synonymous sequences and exon 2 amino acid residues outside the putative ABS. In addition, sympatric populations of these fish species differed significantly in communities of eukaryotic parasites. [Conclusions/Significance] We propose that local host-parasite coevolutionary dynamics may have driven adaptive divergence in MHC alleles, influencing odor-mediated mate choice and leading to reproductive isolation. These results provide the first evidence for a novel mechanism of adaptive speciation and the first evidence of adaptive divergence at the MHC in closely related African cichlid fishes. |
URI: | http://hdl.handle.net/10261/3357 | DOI: | 10.1371/journal.pone.0000734 | ISSN: | 1932-6203 |
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