Dimensions: Collaborative Research: Life at extremes: Linking the phylogenetic and genomic diversity of ctenophores to ecophysiological adaptations in the deep sea

深海占地球上可居住空间的90%以上，但那里的生命在很大程度上对科学来说是个谜。栉水母，也被称为栉水母，是在所有海洋中发现的海洋捕食者，栖息在深海和浅海。尽管脆弱且难以研究，但它们在生物学上很重要，部分原因是它们似乎是在进化过程中从所有其他生物中分离出来的第一批动物，甚至在海绵和水母之前。在进化过程中，许多海洋生物已经将它们的栖息地从深海转移到深海，尽管这两种栖息地在光线、温度和静水压力等方面存在巨大差异。随着时间的推移，这种栖息地的转移需要这些动物谱系发生巨大的遗传和生理变化。梳状水母物种之间的关系表明，来自不同科的物种已经进化到可以在深海中生活和繁衍。该项目将在生化、生理和遗传水平上比较密切相关的深层和浅层物种，以了解这些转变是如何发生的。它将回答有关动物进化的基本机制的问题，并开发用于分析基因组数据集的公开可用工具。它将为两名博士研究生、一名博士后、两名硕士研究生和众多本科生提供尖端技术培训。有关深海生物多样性和胶状动物的公众宣传将有助于教育和激发对海洋生物的欣赏。该项目的主要目标是利用尖端的分子分析来了解进化和多样化，以调查深海栖息地作为新型生物适应的产生力量。将在表层水域使用蓝水水肺和深海远程操作潜艇收集栉水母标本，以生成完整的栉水母系统发育和功能多样性的互补生理和基因组数据。从热带浅水区到温带深海区，研究小组将在一系列栖息地采集样本，测量它们的生理能力，并对转录组和基因组进行测序。该项目将开发新的算法来识别参与深度适应的基因，并检查在深海中对高静水压力的生理耐受性和适应性基础上的遗传事件。为了证实基因序列如何影响酶的特性的理论预测，蛋白质将在实验室中表达和表征。参与该项目的学生、博士后和pi之间的合作将大大加强当代生物多样性调查所需的经典和前沿技能的跨学科劳动力培训。

The deep sea is more than 90 percent of the inhabitable space on Earth, yet life there is largely a mystery to science. Ctenophores, also known as comb jellies, are marine predators found in all oceans, inhabiting both deep and shallow seas. Although fragile and difficult to study, they are biologically important, in part because they appear to have been the first group of animals to split off from all other organisms during evolution, even before sponges and jellyfish. Over evolutionary time, many marine organisms have transitioned their home ranges to and from the deep sea despite the tremendous differences between these two habitats, including light, temperature, and hydrostatic pressure. Such habitat shifts required dramatic genetic and physiological changes to these animal lineages over time. The relationships between comb jelly species indicate that species from a variety of different families have evolved to live and thrive in the deep sea. This project will compare closely related deep and shallow species at biochemical, physiological and genetic levels to understand how these transitions came about. It will answer questions about the fundamental mechanisms of animal evolution and develop publicly available tools for analyzing genomic data sets. It will result in the training of cutting-edge techniques for two PhD students, a postdoc, two masters students, and numerous undergraduates. Public outreach involving biodiversity in the deep sea and gelatinous animals will help educate and inspire appreciation of marine life.The main objective of this project is to understand evolution and diversification using cutting edge molecular analyses to investigate the deep-sea habitat as the generating force of novel biological adaptations. Ctenophore specimens will be collected using blue-water SCUBA in surface waters and remotely operated submarines in the deep sea to generate complementary physiological and genomic data across the full phylogenetic and functional diversity of ctenophores. With samples taken across a range of habitats from shallow tropical waters to temperate bathypelagic zone, the team will measure physiological capabilities and sequence transcriptomes and genomes. This project will develop novel algorithms to identify genes involved in depth adaptation and examine the genetic events that underlie physiological tolerances and adaptations to high hydrostatic pressures in the deep sea. To confirm the theory-based predictions of how gene sequence affects the properties of enzymes, proteins will be expressed and characterized in the lab. Collaborations between the students, postdocs and PIs involved in this project will substantially enhance an interdisciplinary workforce trained in both classical and cutting edge skills needed for contemporary biodiversity investigations.