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Genome-wide analysis to uncover how Pocillopora acuta survives the challenging intertidal environment
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Genome-wide analysis to uncover how Pocillopora acuta survives the challenging intertidal environment
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Journal Article
Genome-wide analysis to uncover how Pocillopora acuta survives the challenging intertidal environment
2024
Overview
Characterisation of genomic variation among corals can help uncover variants underlying trait differences and contribute towards genotype prioritisation in coastal restoration projects. For example, there is growing interest in identifying resilient genotypes for transplantation, and to better understand the genetic processes that allow some individuals to survive in specific conditions better than others. The coral species
Pocillopora acuta
is known to survive in a wide range of habitats, from reefs artificial coastal defences, suggesting its potential use as a starter species for ecological engineering efforts involving coral transplantation onto intertidal seawalls. However, the intertidal section of coastal armour is a challenging environment for corals, with conditions during periods of emersion being particularly stressful. Here, we scanned the entire genome of
P. acuta
corals to identify the regions harbouring single nucleotide polymorphisms (SNPs) and copy number variations (CNVs) that separate intertidal colonies (
n
= 18) from those found in subtidal areas (
n
= 21). Findings revealed 74,391 high quality SNPs distributed across 386 regions of the
P. acuta
genome. While the majority of the detected SNPs were in non-coding regions, 12% were identified in exons (i.e. coding regions). Functional SNPs that were significantly associated with intertidal colonies were found in overrepresented genomic regions linked to cellular homeostasis, metabolism, and signalling processes, which may represent local environmental adaptation in the intertidal. Interestingly, regions that exhibited CNVs were also associated with metabolic and signalling processes, suggesting
P. acuta
corals living in the intertidal have a high capacity to perform biological functions critical for survival in extreme environments.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
