Collaborative Research: Assembling the Tree of Life-An Integrative Approach to Investigating Cnidarian Phylogeny

合作研究：组装生命之树——研究刺胞动物系统发育的综合方法

• 批准号: 0531733
• 负责人: Clifford Cunningham
• 金额: --
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-10-01 至 2010-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0531733&HistoricalAwards=false
• 关键词: Collaborative; Research; Assembling; Tree; Life

The phylum Cnidaria is one of the earliest evolving animal groups and includes prominent members of the marine fauna such as corals, sea anemones and jellyfish. Because cnidarians diverged from the rest of the animals prior to the evolution of organs, their overall anatomy is quite simple. Despite this however, cnidarians have attained incredible diversity, comprising over 11,000 species, many of which display elaborate structures and complex life histories. The lack of organs and other anatomical landmarks has made it difficult for scientists to discern their evolutionary relationships. Recent technological and theoretical advances in the sequencing and analysis of DNA provide the opportunity to use the information encoded within an organism's genetic code to elucidate evolutionary relationships. The primary aim of this proposal is to obtain DNA sequence data from 1,800 cnidarian species: this will generate approximately 23 million base pairs of cnidarian DNA sequence, and the specimens from which the sequences are obtained will be retained in natural history museum collections. The information encoded in the DNA will be used to reconstruct cnidarian phylogenies (evolutionary trees), using computer algorithms and supercomputing facilities. Some of the questions this proposal will address are: Was the ancestor to all of cnidarians solitary or colonial? Are jellyfish or hydras more closely related to the corals? How and when did coral skeletons evolve? What are the evolutionary transitions between a simple hydra polyp and a complex Portuguese Man-of-War colony? Reconstructing a cnidarian evolutionary tree is important for our understanding of the patterns and processes that accompanied the early diversification of animal life. Formal and informal education will result from this research. Undergraduate, graduate, and postdoctoral scholars, including those belonging to groups under-represented in the sciences, will be trained. A symposium on cnidarian evolutionary relationships will be organized by the investigators at a national scientific meeting. A Cnidaria Tree of Life database will be developed to include outreach and learning components such as images, common names, and keys designed to appeal to students at all levels as well as interested users such as divers and aquarists. Museum exhibits will be created based on research results, one at the University of Kansas Natural History Museum, and one, entitled "Cnidarian Diversity in the Oceans" that will be part of the new Oceans Hall, due to open at the National Museum of Natural History in 2008. A website and classroom poster (in both English and Spanish) integrated with the latter exhibit will be created in collaboration with a K-12 educator supported through NSF's Research Experience for Teachers program.

刺胞动物门是最早进化的动物类群之一，包括珊瑚、海葵和水母等海洋动物的重要成员。由于刺胞动物在器官进化之前就与其他动物不同，因此它们的整体解剖结构相当简单。尽管如此，刺胞动物已经达到了令人难以置信的多样性，包括超过11，000种，其中许多显示出复杂的结构和复杂的生活史。由于缺乏器官和其他解剖标志，科学家很难辨别它们的进化关系。DNA测序和分析方面的最新技术和理论进展为利用生物体遗传密码中编码的信息阐明进化关系提供了机会。这项建议的主要目的是从1，800个刺胞动物物种中获得DNA序列数据：这将产生大约2，300万个碱基对的刺胞动物DNA序列，获得序列的标本将保留在自然历史博物馆的藏品中。编码在DNA中的信息将被用来重建刺胞动物的进化树，使用计算机算法和超级计算设备。这个提议将解决的一些问题是：所有刺胞动物的祖先是独居的还是殖民的？水母或水螅与珊瑚的关系更密切吗？珊瑚骨骼是如何以及何时进化的？从简单的水螅到复杂的葡萄牙僧帽水母，它们之间的进化转变是什么？重建刺胞动物进化树对于我们理解伴随动物生命早期多样化的模式和过程非常重要。 正式和非正式教育将从这项研究中产生。本科生，研究生和博士后学者，包括那些属于科学代表性不足的群体，将接受培训。研究人员将在一次全国科学会议上组织一次关于刺胞动物进化关系的研讨会。将开发一个刺胞动物生命树数据库，包括宣传和学习内容，如图像、通用名称和钥匙，旨在吸引各级学生以及潜水员和水族馆管理员等感兴趣的用户。博物馆展品将根据研究结果制作，一个在堪萨斯大学自然历史博物馆，另一个题为“海洋中的刺胞动物多样性”，将成为定于2008年在国家自然历史博物馆开放的新海洋厅的一部分。一个网站和教室海报（英语和西班牙语）与后者的展览集成将创建通过NSF的教师研究经验计划支持的K-12教育家合作。