Molecular Evolution and Deep Phylogeny of Deuterostomia

后口动物的分子进化和深层系统发育

• 批准号: 5453540
• 负责人: Professor Dr. Martin Schlegel
• 金额: --
• 依托单位: AG Molekulare Evolution und Systematik der Tiere
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5453540?language=en
• 关键词: Molecular; Evolution; Deep; Phylogeny; Deuterostomia

The radiation of Deuterostomia in the Cambrian resulted in three major lineages, the Echinodermata, Hemichordata, and Chordata. The phylogenetic relationships between and within these subgroups have been a matter of long and controversial debate. The molecular approach applied until now did not contribute significantly to the problem. This leaves a deep gap in our understanding of metazoan relationships as well as in the evolution of fundamental morphological characters such as the chorda dorsalis and the gut with gill slits. Within the special research programme Deep Metazoan Phylogeny we aim to contribute to the reconstruction of phylogenetic relationships of the major deuterostome lineages using the sequence and gene order evolution of the histone gene cluster as a molecular tool. Overall, most data are lacking in hemichordates. Thus, we will mainly focus on this group, extending the histone data set by still missing small and large ribosomal RNA sequences. Furthermore, Espressed Sequence Tags will be isolated for future analyses of additional phylogenetically informative genes.

寒武纪后口的辐射导致了三个主要的谱系，棘皮动物，半角动物和脊索动物。这些亚群之间和内部的系统发育关系一直是一个长期且有争议的问题。到目前为止，应用的分子方法并没有对这个问题产生重大影响。这在我们对后生动物关系的理解以及基本形态特征的进化上留下了很深的空白，例如背索和带鳃缝的肠道。在深部后生动物系统发育的特殊研究计划中，我们的目标是利用组蛋白基因簇的序列和基因序列进化作为分子工具，为重建主要后生动物谱系的系统发育关系做出贡献。总体而言，大多数数据都缺乏半角形数据。因此，我们将主要关注这一组，通过仍然缺失的大小核糖体RNA序列来扩展组蛋白数据集。此外，提取的序列标签将被分离出来，用于未来对更多的系统发育信息基因的分析。