尼加拉瓜 Midas 慈鲷视觉色素发色团的使用:表型可塑性和 cyp27c1 表达的遗传同化

IF 2.2 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
César Bertinetti, Axel Meyer, Julián Torres-Dowdall
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引用次数: 0

摘要

水生栖息地的光照条件千差万别,这可能是一种选择性压力,有可能推动远洋鱼类视觉系统的快速进化和多样性。远摄鱼通过调节视觉色素的两个组成部分--视蛋白和发色团--来微调其视觉敏感度。与视蛋白的变化相比,发色团在不同光照生境中的使用很少受到关注。尼加拉瓜米达斯慈鲷物种群(Amphilophus cf citrinellus [Günther 1864])已在七个光照条件不同的孤立火山口湖泊中独立定居,并在近期产生了若干适应性辐射。在这里,我们研究了调控发色团交换的主要酶 cyp27c1 的变异。我们测量了cyp27c1在野生光照环境中的表达、其在实验室饲养鱼类中的遗传成分,以及其在发育过程中对不同光照条件的反应。我们发现,光照环境能显著预测野生种群中 cyp27c1 表达的变化,而且这种变化似乎在两个种群中被遗传同化。此外,在我们的操作实验中,光诱导的cyp27c1表达表现出基因型与环境之间的相互作用。总之,cyp27c1表达的湖内变异较高,且与沿光照梯度的视蛋白基因表达变异成反比,这强调了cyp27c1在慈鲷视觉生态中的关键作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Visual pigment chromophore usage in Nicaraguan Midas cichlids: phenotypic plasticity and genetic assimilation of cyp27c1 expression

Visual pigment chromophore usage in Nicaraguan Midas cichlids: phenotypic plasticity and genetic assimilation of cyp27c1 expression

The wide-ranging photic conditions found across aquatic habitats may act as selective pressures that potentially drive the rapid evolution and diversity of the visual system in teleost fish. Teleost fish fine-tune their visual sensitivities by regulating the two components of visual pigments, the opsin protein and the chromophore. Compared with opsin protein variation, chromophore usage across photic habitats has received little attention. The Nicaraguan Midas cichlid species complex, Amphilophus cf citrinellus [Günther 1864], has independently colonized seven isolated crater lakes with different photic conditions, resulting in several recent adaptive radiations. Here, we investigate variation in cyp27c1, the main enzyme modulating chromophore exchange. We measured cyp27c1 expression in photic environments in the wild, its genetic component in laboratory-reared fish, and its response to different light conditions during development. We found that photic environments significantly predict variation in cyp27c1 expression in wild populations and that this variation seems to be genetically assimilated in two populations. Furthermore, light-induced cyp27c1 expression exhibited genotype-by-environment interactions in our manipulative experiments. Overall, within-lake variation in cyp27c1 expression was higher and inversely related to variation in opsin gene expression along the photic gradient, emphasizing the key role of cyp27c1 in the visual ecology of cichlid fish.

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来源期刊
Hydrobiologia
Hydrobiologia 生物-海洋与淡水生物学
CiteScore
5.40
自引率
11.50%
发文量
288
审稿时长
4.9 months
期刊介绍: Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.
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