High natural gene expression variation in the reef-building coral Acropora millepora: potential for acclimative and adaptive plasticity

Granados-Cifuentes, Camila, Bellantuono, Anthony J., Ridgway, Tyrone, Hoegh-Guldberg, Ove and Rodriguez-Lanetty, Mauricio (2013) High natural gene expression variation in the reef-building coral Acropora millepora: potential for acclimative and adaptive plasticity. Bmc Genomics, 14 1: 228.1-228.12. doi:10.1186/1471-2164-14-228


Author Granados-Cifuentes, Camila
Bellantuono, Anthony J.
Ridgway, Tyrone
Hoegh-Guldberg, Ove
Rodriguez-Lanetty, Mauricio
Title High natural gene expression variation in the reef-building coral Acropora millepora: potential for acclimative and adaptive plasticity
Journal name Bmc Genomics   Check publisher's open access policy
ISSN 1471-2164
Publication date 2013-04-01
Year available 2013
Sub-type Article (original research)
DOI 10.1186/1471-2164-14-228
Open Access Status DOI
Volume 14
Issue 1
Start page 228.1
End page 228.12
Total pages 12
Place of publication London, United Kingdom
Publisher BioMed Central
Language eng
Formatted abstract
Background: Ecosystems worldwide are suffering the consequences of anthropogenic impact. The diverse ecosystem of coral reefs, for example, are globally threatened by increases in sea surface temperatures due to global warming. Studies to date have focused on determining genetic diversity, the sequence variability of genes in a species, as a proxy to estimate and predict the potential adaptive response of coral populations to environmental changes linked to climate changes. However, the examination of natural gene expression variation has received less attention. This variation has been implicated as an important factor in evolutionary processes, upon which natural selection can act.

Results: We acclimatized coral nubbins from six colonies of the reef-building coral Acropora millepora to a common garden in Heron Island (Great Barrier Reef, GBR) for a period of four weeks to remove any site-specific environmental effects on the physiology of the coral nubbins. By using a cDNA microarray platform, we detected a high level of gene expression variation, with 17% (488) of the unigenes differentially expressed across coral nubbins of the six colonies (jsFDR-corrected, p < 0.01). Among the main categories of biological processes found differentially expressed were transport, translation, response to stimulus, oxidation-reduction processes, and apoptosis. We found that the transcriptional profiles did not correspond to the genotype of the colony characterized using either an intron of the carbonic anhydrase gene or microsatellite loci markers.

Conclusion: Our results provide evidence of the high inter-colony variation in A. millepora at the transcriptomic level grown under a common garden and without a correspondence with genotypic identity. This finding brings to our attention the importance of taking into account natural variation between reef corals when assessing experimental gene expression differences. The high transcriptional variation detected in this study is interpreted and discussed within the context of adaptive potential and phenotypic plasticity of reef corals. Whether this variation will allow coral reefs to survive to current challenges remains unknown
Keyword Coral reefs
Acropora millepora
Gene expression variation
Microarrays
Microsatellites
Intron
Epigenetics
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Global Change Institute Publications
Official 2014 Collection
 
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