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    Evidence of Positively Selected Sites in Mammalian a-Defensins


    Lynn, David J. and Lloyd, Andrew T. and Fares, Mario A. and O'Farrelly, Cliona (2004) Evidence of Positively Selected Sites in Mammalian a-Defensins. Molecular Biology and Evolution, 21 (5). pp. 819-827.

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    Abstract

    Defensins are a family of mammalian antimicrobial peptides that exhibit variable activity against a panel of microbes, including bacteria, fungi, and enveloped viruses. We have employed a maximum-likelihood approach to detect evidence of positive selection (adaptive evolution) in the evolution of these important molecules of the innate immune response. We have identified 14 amino acid sites that are predicted to be subject to positive selection. Furthermore, we show that all these sites are located in the mature antimicrobial peptide and not in the prepropeptide region of the molecule, implying that they are of functional importance. These results suggest that mammalian a-defensins have been under selective pressure to evolve in response to potentially infectious challenges by fast-evolving microbes.

    Item Type: Article
    Keywords: Adaptive evolution, antimicrobial peptide, a-defensin.
    Academic Unit: Faculty of Science and Engineering > Biology
    Item ID: 320
    Depositing User: Dr. Mario Fares
    Date Deposited: 23 Sep 2008
    Journal or Publication Title: Molecular Biology and Evolution
    Publisher: Society for Molecular Biology and Evolution
    Refereed: Yes
    URI:

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