Aiptasia sp. larvae as a model to reveal mechanisms of symbiont selection in cnidarians

• Published in: Scientific reports Vol. 6; no. 1; p. 32366
• Main Authors: Wolfowicz, Iliona, Baumgarten, Sebastian, Voss, Philipp A., Hambleton, Elizabeth A., Voolstra, Christian R., Hatta, Masayuki, Guse, Annika
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 01.09.2016; Nature Publishing Group
• Subjects: 14/19; 631/158/2446/837; 631/601; 631/80; 704/829/826; Animals; Anthozoa - genetics; Anthozoa - physiology; Aquatic life; Biodiversity; Controlled conditions; Coral reef ecosystems; Coral reefs; Corals; Dinoflagellates; Gene Expression Profiling; Genetic Association Studies; Humanities and Social Sciences; Larva; Larvae; Models, Biological; multidisciplinary; Phagocytosis; Ribonucleic acid; RNA; Science; Science (multidisciplinary); Sea Anemones - genetics; Sea Anemones - physiology; Sequence Analysis, RNA; Symbionts; Symbiosis; Symbiosis - genetics; Time Factors
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/srep32366

Symbiosis, defined as the persistent association between two distinct species, is an evolutionary and ecologically critical phenomenon facilitating survival of both partners in diverse habitats. The biodiversity of coral reef ecosystems depends on a functional symbiosis with photosynthetic dinoflagellates of the highly diverse genus Symbiodinium , which reside in coral host cells and continuously support their nutrition. The mechanisms underlying symbiont selection to establish a stable endosymbiosis in non-symbiotic juvenile corals are unclear. Here we show for the first time that symbiont selection patterns for larvae of two Acropora coral species and the model anemone Aiptasia are similar under controlled conditions. We find that Aiptasia larvae distinguish between compatible and incompatible symbionts during uptake into the gastric cavity and phagocytosis. Using RNA-Seq, we identify a set of candidate genes potentially involved in symbiosis establishment. Together, our data complement existing molecular resources to mechanistically dissect symbiont phagocytosis in cnidarians under controlled conditions, thereby strengthening the role of Aiptasia larvae as a powerful model for cnidarian endosymbiosis establishment.