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Symbiodinium genomes reveal adaptive evolution of functions related to coral-dinoflagellate symbiosis
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Symbiodinium genomes reveal adaptive evolution of functions related to coral-dinoflagellate symbiosis
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Journal Article
Symbiodinium genomes reveal adaptive evolution of functions related to coral-dinoflagellate symbiosis
2018
Overview
Symbiosis between dinoflagellates of the genus
Symbiodinium
and reef-building corals forms the trophic foundation of the world’s coral reef ecosystems. Here we present the first draft genome of
Symbiodinium goreaui
(Clade C, type C1: 1.03 Gbp), one of the most ubiquitous endosymbionts associated with corals, and an improved draft genome of
Symbiodinium kawagutii
(Clade F, strain CS-156: 1.05 Gbp) to further elucidate genomic signatures of this symbiosis. Comparative analysis of four available
Symbiodinium
genomes against other dinoflagellate genomes led to the identification of 2460 nuclear gene families (containing 5% of
Symbiodinium
genes) that show evidence of positive selection, including genes involved in photosynthesis, transmembrane ion transport, synthesis and modification of amino acids and glycoproteins, and stress response. Further, we identify extensive sets of genes for meiosis and response to light stress. These draft genomes provide a foundational resource for advancing our understanding of
Symbiodinium
biology and the coral-algal symbiosis.
Huanle Liu et al. report draft genomes of two
Symbiodinium
species, one from the most dominant type of symbionts in reef-building corals. They find evidence of positive selection in genes related to stress response, meiosis and other traits required for forming successful symbiotic relationships.
