Gene expression under chronic heat stress in populations of the mustard hill coral (Porites astreoides) from different thermal environments

Molecular Ecology
C D KenkelMikhail Matz

Abstract

Recent evidence suggests that corals can acclimatize or adapt to local stress factors through differential regulation of their gene expression. Profiling gene expression in corals from diverse environments can elucidate the physiological processes that may be responsible for maximizing coral fitness in their natural habitat and lead to a better understanding of the coral's capacity to survive the effects of global climate change. In an accompanying paper, we show that Porites astreoides from thermally different reef habitats exhibit distinct physiological responses when exposed to 6 weeks of chronic temperature stress in a common garden experiment. Here, we describe expression profiles obtained from the same corals for a panel of 9 previously reported and 10 novel candidate stress response genes identified in a pilot RNA-Seq experiment. The strongest expression change was observed in a novel candidate gene potentially involved in calcification, SLC26, a member of the solute carrier family 26 anion exchangers, which was down-regulated by 92-fold in bleached corals relative to controls. The most notable signature of divergence between coral populations was constitutive up-regulation of metabolic genes in corals from the warmer in...Continue Reading

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Related Concepts

Thermotolerance
Metabolic Process, Cellular
Biochemical Pathway
Biological Adaptation to Stress
Mustard antigen
Coral
Gluconeogenesis
Enzymes, antithrombotic
Candidate Disease Gene
Hot Temperature

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