Studies on the evolution of characters in the cephalochordates, based on molecular trees of many living species over the world

基于世界上许多现存物种的分子树研究头索动物的性状进化

• 批准号: 13440253
• 负责人: NISHIKAWA Teruaki
• 金额: $ 9.54万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440253/
• 关键词: Cephalochordata; Branchiostoma; Epigonichthys; mitochondrial DNA; cryptic species; phylogeny; evolution; characters; 形質進化; 単系統群; 分子進化; 遺伝的距離; 遺伝子配置変動; コドン使用の変則

We have analyzed the whole mitochondrial genomes of far more than the half of the samples gained during the present project (24 populations of 15 species over the world) and got many important results as follows :(1) The uniqueness of Epigonichthys lucayanus has been revealed.(2) Paraphyly of the genus Epigonichthys has been proved, with the deepest branching between E.lucayanus (and its cryptic species, see below) and the remaining (consisting of its congeners and the species of the other recognized genus Branchiostoma) ; thus the Cephalochordata has proved to be divided into the three (instead of the two in the present system) genera.(3) E.lucayanus has been found to contain two species, which are indistinguishable morphologically from each other.(4) Molecular data of the European lancelet, Branchiostoma lanceolatum registered in the data bank of molecular information has been revealed quite different from our analyses of the same species from Helgoland and Napoli, instead similar to that of B.floridae from Florida ; this discrepancy is attributable to mis-identification of the data in the bank.

本研究对全球15种共24个群体的近半数样本进行了线粒体全基因组分析，获得了以下重要结果：（1）揭示了路卡亚上棘鲷的独特性。(2)上棘鱼属（Epigonichthys）的并系已被证实，最深的分支在E.lucayanus（及其隐种，见下文）和其余的（包括其同源物和另一个公认的属Branchiostoma的物种）之间;因此，鲸脊索动物被证明分为三个属（而不是目前系统中的两个）。(3)已发现E.lucayanus包含两个物种，它们在形态上彼此无法区分。(4)在分子信息数据库中注册的欧洲文昌鱼Branchiostoma lanceolatum的分子数据与我们对来自Helgoland和Napoli的相同物种的分析有很大差异，而与来自佛罗里达的B.floridae的分析相似;这种差异可归因于数据库中数据的错误识别。

项目成果

Nohara, M., Nishida, M., Manthacitra, V., Nishikawa, T.: "Ancient phylogenetic separation between Pacific and Atlantic cephalochordates as revealed by mitochondrial genome analysis"Zoological Science. 21/2. 203-210 (2004)

Nohara, M.、Nishida, M.、Manthacitra, V.、Nishikawa, T.：“线粒体基因组分析揭示了太平洋和大西洋头索动物之间的古代系统发育分离”《动物学科学》。

Nohara, M., Nishida, M., Manthacitra, V., Nishikawa, T.: "Ancient phylogenetic separation between Pacific and Atlantic cephalochordates as revealed by mitochondrial genome analysis"Zoological Science. 21(2). 203-210 (2004)

Nohara, M.、Nishida, M.、Manthacitra, V.、Nishikawa, T.：“线粒体基因组分析揭示了太平洋和大西洋头索动物之间的古代系统发育分离”《动物学科学》。

Nohara, M., Nishida, M., Mantha-citra, V., Nishikawa, T.: "Ancient phylogenetic separation between Pacific and Atlantic cephalochordates as revealed by mitochondrial genome analysis"Zoological Science. 21・2. 203-210 (2004)

Nohara, M.、Nishida, M.、Mantha-citra, V.、Nishikawa, T.：“通过线粒体基因组分析揭示太平洋和大西洋头索动物的古代系统发育分离”《动物学科学》21・2（2004 年）。 ）