The Coral Symbiomics Lab
Red Sea Research Center
Division of Biological and Environmental Science and Engineering

Publications in 2011

Rapid Evolution of Coral Proteins Responsible for Interaction with the Environment

​Voolstra, Sunagawa, Matz, Bayer, Aranda, Buschiazzo, DeSalvo, Lindquist, Szmant, Coffroth and Medina, “Rapid Evolution of Coral Proteins Responsible for Interaction with the Environment,” PLOS ONE 6, no. 5 (2011).
Voolstra, Sunagawa, Matz, Bayer, Aranda, Buschiazzo, DeSalvo, Lindquist, Szmant, Coffroth and Medina
Evolution, Coral, Interaction
2011
​Corals worldwide are in decline due to climate change effects (e.g., rising seawater temperatures), pollution, and exploitation. The ability of corals to cope with these stressors in the long run depends on the evolvability of the underlying genetic networks and proteins, which remain largely unknown. A genome-wide scan for positively selected genes between related coral species can help to narrow down the search space considerably. Methodology/Principal Findings We screened a set of 2,604 putative orthologs from EST-based sequence datasets of the coral species Acropora millepora and Acropora palmata to determine the fraction and identity of proteins that may experience adaptive evolution. 7% of the orthologs show elevated rates of evolution. Taxonomically-restricted (i.e. lineage-specific) genes show a positive selection signature more frequently than genes that are found across many animal phyla. The class of proteins that displayed elevated evolutionary rates was significantly enriched for proteins involved in immunity and defense, reproduction, and sensory perception. We also found elevated rates of evolution in several other functional groups such as management of membrane vesicles, transmembrane transport of ions and organic molecules, cell adhesion, and oxidative stress response. Proteins in these processes might be related to the endosymbiotic relationship corals maintain with dinoflagellates in the genus Symbiodinium. Conclusion/Relevance This study provides a birds-eye view of the processes potentially underlying coral adaptation, which will serve as a foundation for future work to elucidate the rates, patterns, and mechanisms of corals' evolutionary response to global climate change.