Parsing parallel evolution : ecological divergence and differential gene expression in the adaptive radiations of thick-lipped Midas cichlid fishes from Nicaragua

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Comparative genomics of parallel in repeated adaptive radiations (GenAdap)
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Molecular Ecology. 2013, 22(3), pp. 650-669. ISSN 0962-1083. eISSN 1365-294X. Available under: doi: 10.1111/mec.12034
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The study of parallel evolution facilitates the discovery of common rules of diversification. Here, we examine the repeated evolution of thick lips in Midas cichlid fishes (the Amphilophus citrinellus species complex)-from two Great Lakes and two crater lakes in Nicaragua-to assess whether similar changes in ecology, phenotypic trophic traits and gene expression accompany parallel trait evolution. Using next-generation sequencing technology, we characterize transcriptome-wide differential gene expression in the lips of wild-caught sympatric thick- and thin-lipped cichlids from all four instances of repeated thick-lip evolution. Six genes (apolipoprotein D, myelin-associated glycoprotein precursor, four-and-a-half LIM domain protein 2, calpain-9, GTPase IMAP family member 8-like and one hypothetical protein) are significantly underexpressed in the thick-lipped morph across all four lakes. However, other aspects of lips' gene expression in sympatric morphs differ in a lake-specific pattern, including the magnitude of differentially expressed genes (97-510). Generally, fewer genes are differentially expressed among morphs in the younger crater lakes than in those from the older Great Lakes. Body shape, lower pharyngeal jaw size and shape, and stable isotopes (δ(13)C and δ(15)N) differ between all sympatric morphs, with the greatest differentiation in the Great Lake Nicaragua. Some ecological traits evolve in parallel (those related to foraging ecology; e.g. lip size, body and head shape) but others, somewhat surprisingly, do not (those related to diet and food processing; e.g. jaw size and shape, stable isotopes). Taken together, this case of parallelism among thick- and thin-lipped cichlids shows a mosaic pattern of parallel and nonparallel evolution.

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ISO 690MANOUSAKI, Tereza, Pincelli M. HULL, Henrik KUSCHE, Gonzalo MACHADO-SCHIAFFINO, Paolo FRANCHINI, Chris HARROD, Kathryn R. ELMER, Axel MEYER, 2013. Parsing parallel evolution : ecological divergence and differential gene expression in the adaptive radiations of thick-lipped Midas cichlid fishes from Nicaragua. In: Molecular Ecology. 2013, 22(3), pp. 650-669. ISSN 0962-1083. eISSN 1365-294X. Available under: doi: 10.1111/mec.12034
BibTex
@article{Manousaki2013-02Parsi-20878,
  year={2013},
  doi={10.1111/mec.12034},
  title={Parsing parallel evolution : ecological divergence and differential gene expression in the adaptive radiations of thick-lipped Midas cichlid fishes from Nicaragua},
  number={3},
  volume={22},
  issn={0962-1083},
  journal={Molecular Ecology},
  pages={650--669},
  author={Manousaki, Tereza and Hull, Pincelli M. and Kusche, Henrik and Machado-Schiaffino, Gonzalo and Franchini, Paolo and Harrod, Chris and Elmer, Kathryn R. and Meyer, Axel}
}
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