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Transcriptomic analysis reveals protein homeostasis breakdown in the coral Acropora millepora during hypo-saline stress

  • Aguilar, Catalina1, 2, 3, 4
  • Raina, Jean-Baptiste1, 5
  • Fôret, Sylvain2, 6
  • Hayward, David C.6
  • Lapeyre, Bruno7
  • Bourne, David G.1, 8, 9
  • Miller, David J.1, 2
  • 1 James Cook University, [email protected] and Department of Molecular and Cell Biology, Townsville, Queensland, 4811, Australia , Townsville (Australia)
  • 2 James Cook University, ARC Centre of Excellence for Coral Reef Studies and Department of Molecular and Cell Biology, Townsville, Queensland, 4811, Australia , Townsville (Australia)
  • 3 University of Miami, Cooperative Institute for Marine and Atmospheric Studies, Rosenstiel School of Marine & Atmospheric Science, 4600 Rickenbacker Causeway, Miami, Florida, 33149, USA , Miami (United States)
  • 4 Atlantic Oceanographic and Meteorological Laboratories (AOML), NOAA, 4301 Rickenbacker Causeway, Miami, Florida, 33149, USA , Miami (United States)
  • 5 University of Technology, Climate Change Cluster (C3), Sydney, NSW, 2007, Australia , Sydney (Australia)
  • 6 Australian National University, Division of Ecology and Evolution, Research School of Biology, Canberra, ACT, 2601, Australia , Canberra (Australia)
  • 7 Laboratoire d’excellence CORAIL, Centre de Recherches Insulaires et Observatoire de l’Environnement (CRIOBE), Moorea, Papeete, French Polynesia , Moorea (French Polynesia)
  • 8 Australian Institute of Marine Science, Townsville, Queensland, 4810, Australia , Townsville (Australia)
  • 9 James Cook University, College of Science and Engineering, Townsville, 4811, Australia , Townsville (Australia)
Published Article
BMC Genomics
Springer (Biomed Central Ltd.)
Publication Date
Feb 20, 2019
DOI: 10.1186/s12864-019-5527-2
Springer Nature


BackgroundCoral reefs can experience salinity fluctuations due to rainfall and runoff; these events can have major impacts on the corals and lead to bleaching and mortality. On the Great Barrier Reef (GBR), low salinity events, which occur during summer seasons and can involve salinity dropping ~ 10 PSU correlate with declines in coral cover, and these events are predicted to increase in frequency and severity under future climate change scenarios. In other marine invertebrates, exposure to low salinity causes increased expression of genes involved in proteolysis, responses to oxidative stress, and membrane transport, but the effects that changes in salinity have on corals have so far received only limited attention. To better understand the coral response to hypo-osmotic stress, here we investigated the transcriptomic response of the coral Acropora millepora in both adult and juvenile life stages to acute (1 h) and more prolonged (24 h) exposure to low salinity.ResultsDifferential gene expression analysis revealed the involvement of both common and specific response mechanisms in Acropora. The general response to environmental stressors included up-regulation of genes involved in the mitigation of macromolecular and oxidative damage, while up-regulation of genes involved in amino acid metabolism and transport represent specific responses to salinity stress.ConclusionsThis study is the first comprehensive transcriptomic analysis of the coral response to low salinity stress and provides important insights into the likely consequences of heavy rainfall and runoff events on coral reefs.

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