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Selective sweeps in Cryptocercus woodroach antifungal proteins

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Abstract

We identified the antifungal gene termicin in three species of Cryptocercus woodroaches. Cryptocercus represents the closest living cockroach lineage of termites, which suggests that the antifungal role of termicin evolved prior to the divergence of termites from other cockroaches. An analysis of Cryptocercus termicin and two β-1,3-glucanase genes (GNBP1 and GNBP2), which appear to work synergistically with termicin in termites, revealed evidence of selection in these proteins. We identified the signature of past selective sweeps within GNBP2 from Cryptocercus punctulatus and Cryptocercus wrighti. The signature of past selective sweeps was also found within termicin from Cryptocercus punctulatus and Cryptocercus darwini. Our analysis further suggests a phenotypically identical variant of GNBP2 was maintained within Cryptocercus punctulatus, Cryptocercus wrighti, and Cryptocercus darwini while synonymous sites diverged. Cryptocercus termicin and GNBP2 appear to have experienced similar selective pressure to that of their termite orthologues in Reticulitermes. This selective pressure may be a result of ubiquitous entomopathogenic fungal pathogens such as Metarhizium. This study further reveals the similarities between Cryptocercus woodroaches and termites.

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Authors and Affiliations

  1. Department of Biological Sciences, Towson University, 341 Smith Hall, 8000 York Rd., Towson, MD, 21252, USA

    Joseph F. Velenovsky IV, Jessica Kalisch & Mark S. Bulmer

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  1. Joseph F. Velenovsky IV
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  2. Jessica Kalisch
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  3. Mark S. Bulmer
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Correspondence to Mark S. Bulmer.

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Velenovsky, J.F., Kalisch, J. & Bulmer, M.S. Selective sweeps in Cryptocercus woodroach antifungal proteins. Genetica 144, 547–552 (2016). https://doi.org/10.1007/s10709-016-9923-0

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  • DOI: https://doi.org/10.1007/s10709-016-9923-0

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