Decrypting Corals: Does Regulatory Evolution Underlie Environmental Specialisation of Coral Cryptic Lineages?

IF 4.5 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Dominique N Gallery, John P Rippe, Mikhail V Matz
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引用次数: 0

Abstract

A recent sequencing study has shown that two common Caribbean corals, Montastraea cavernosa and Siderastrea siderea, each consist of four genetically distinct lineages in the Florida Keys. These lineages are specialised to a certain depth and, to a lesser extent, to nearshore or offshore habitats. We hypothesised that the lineages' environmental specialisation is at least in part due to regulatory evolution, which would manifest as the emergence of groups of coregulated genes ('modules') demonstrating lineage-specific responses to different reef environments. Our hypothesis also predicted that genes belonging to such modules would show greater genetic divergence between lineages than other genes. Contrary to these expectations, responses of cryptic lineages to natural environmental variation were essentially the same at the genome-wide gene coexpression network level, with much fewer differences in gene expression between lineages compared to between habitats. Moreover, none of the identified coregulated gene expression modules exhibit elevated genetic divergence between lineages. Possible explanations of these unexpected results range from the leading role of algal symbionts and/or microbiome in adaptation to strong action of spatially varying selection equalising gene expression patterns despite different genetic background. We discuss how future studies could assist in discriminating between these possibilities.

解密珊瑚:调控进化是珊瑚隐生系环境特化的基础吗?
最近的一项测序研究表明,在佛罗里达礁岛群,两种常见的加勒比珊瑚(Montastraea cavernosa 和 Siderastrea siderea)分别由四个基因不同的品系组成。这些品系专精于一定的深度,其次是近岸或离岸栖息地。我们假设,这些品系的环境特化至少有一部分是由于调控进化造成的,这种进化将表现为核心基因组("模块")的出现,显示出品系对不同珊瑚礁环境的特异性反应。我们的假设还预测,与其他基因相比,属于这类模块的基因在不同种系之间会表现出更大的遗传差异。与预期相反的是,在全基因组基因共表达网络水平上,隐性种系对自然环境变化的反应基本相同,种系间基因表达的差异远远小于栖息地间的差异。此外,在已确定的核心基因表达模块中,没有一个表现出系间遗传差异的增加。这些意外结果的可能解释包括:藻类共生体和/或微生物群在适应过程中发挥了主导作用,以及尽管遗传背景不同,但不同空间选择的强大作用使基因表达模式趋于一致。我们将讨论未来的研究如何帮助区分这些可能性。
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来源期刊
Molecular Ecology
Molecular Ecology 生物-进化生物学
CiteScore
8.40
自引率
10.20%
发文量
472
审稿时长
1 months
期刊介绍: Molecular Ecology publishes papers that utilize molecular genetic techniques to address consequential questions in ecology, evolution, behaviour and conservation. Studies may employ neutral markers for inference about ecological and evolutionary processes or examine ecologically important genes and their products directly. We discourage papers that are primarily descriptive and are relevant only to the taxon being studied. Papers reporting on molecular marker development, molecular diagnostics, barcoding, or DNA taxonomy, or technical methods should be re-directed to our sister journal, Molecular Ecology Resources. Likewise, papers with a strongly applied focus should be submitted to Evolutionary Applications. Research areas of interest to Molecular Ecology include: * population structure and phylogeography * reproductive strategies * relatedness and kin selection * sex allocation * population genetic theory * analytical methods development * conservation genetics * speciation genetics * microbial biodiversity * evolutionary dynamics of QTLs * ecological interactions * molecular adaptation and environmental genomics * impact of genetically modified organisms
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