Global Kinetoplastea phylogeny inferred from a large-scale multigene alignment including parasitic species for better understanding transitions from a free-living to a parasitic lifestyle

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  • Yazaki Euki
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • Ishikawa Sohta A.
    Department of Biological Sciences, Graduate School of Sciences, University of Tokyo
  • Kume Keitaro
    Graduate School of Life and Environmental Sciences, University of Tsukuba Graduate School of Systems and Information Engineering, University of Tsukuba
  • Kumagai Akira
    Miyagi Prefecture Fisheries Technology Institute
  • Kamaishi Takashi
    National Research Institute of Aquaculture, Fisheries Research Agency
  • Tanifuji Goro
    Department of Zoology, National Museum of Nature and Science
  • Hashimoto Tetsuo
    Graduate School of Life and Environmental Sciences, University of Tsukuba Center for Computational Sciences, University of Tsukuba
  • Inagaki Yuji
    Graduate School of Life and Environmental Sciences, University of Tsukuba Center for Computational Sciences, University of Tsukuba

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<p>All members of the order Trypanosomatida known to date are parasites that are most likely descendants of a free-living ancestor. Trypanosomatids are an excellent model to assess the transition from a free-living to a parasitic lifestyle, because a large amount of experimental data has been accumulated for well-studied members that are harmful to humans and livestock (Trypanosoma spp. and Leishmania spp.). However, recent advances in our understanding of the diversity of trypanosomatids and their close relatives (i.e., members of the class Kinetoplastea) have suggested that the change in lifestyle took place multiple times independently from that which gave rise to the extant trypanosomatid parasites. In the current study, transcriptomic data of two parasitic kinetoplastids belonging to orders other than Trypanosomatida, namely Azumiobodo hoyamushi (Neobodonida) and Trypanoplasma borreli (Parabodonida), were generated. We re-examined the transition from a free-living to a parasitic lifestyle in the evolution of kinetoplastids by combining (i) the relationship among the five orders in Kinetoplastea and (ii) that among free-living and parasitic species within the individual orders. The former relationship was inferred from a large-scale multigene alignment including the newly generated data from Azumiobodo and Trypanoplasma, as well as the data from another parasitic kinetoplastid, Perkinsela sp., deposited in GenBank; and the latter was inferred from a taxon-rich small subunit ribosomal DNA alignment. Finally, we discuss the potential value of parasitic kinetoplastids identified in Parabodonida and Neobodonida for studying the evolutionary process that turned a free-living species into a parasite.</p>

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