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A new case of kleptoplasty in animals: Marine flatworms steal functional plastids from diatoms
Van Steenkiste, N.W.L.; Stephenson, I.; Herranz, M.; Husnik, F.; Keeling, P. J.; Leander, B.S. (2019). A new case of kleptoplasty in animals: Marine flatworms steal functional plastids from diatoms. Science Advances 5(7): eaaw4337. https://dx.doi.org/10.1126/sciadv.aaw4337
In: Science Advances. AAAS: New York. ISSN 2375-2548; e-ISSN 2375-2548
Peer reviewed article  
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  • Van Steenkiste, N.W.L.
  • Stephenson, I.
  • Herranz, M.
  • Husnik, F.
  • Keeling, P. J.
  • Leander, B.S.
Abstract
    To date, sea slugs have been considered the only animals known to sequester functional algal plastids into their own cells, via a process called “kleptoplasty.” We report here, however, that endosymbionts in the marine flatworms Baicalellia solarisand ogaina paranygulgus are isolated plastids stolen from diatoms. Ultrastructural data show that kleptoplasts are located within flatworm cells, while algal nuclei and other organelles are absent. Transcriptomic analysis and rbcL amplicons confirm the absence of algal nuclear mRNA and reveal that the plastids originate from different species of diatoms. Laboratory experiments demonstrated photosynthetic activity and short-term retention of kleptoplasts in starved worms. This lineage of flatworms represents the first known case of functional kleptoplasty involving diatoms and only the second known case of kleptoplasty across the entire tree of animals.
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