論文

査読有り
2008年2月

Phylogenetic analyses of the dinoflagellate Noctiluca scintillans based on beta-tubulin and Hsp90 genes

EUROPEAN JOURNAL OF PROTISTOLOGY
  • Yasuhiro Fukuda
  • ,
  • Hiroshi Endoh

44
1
開始ページ
27
終了ページ
33
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.ejop.2007.07.001
出版者・発行元
ELSEVIER GMBH, URBAN & FISCHER VERLAG

The noctilucid dinoflagellate Noctiluca scintillans is an unarmed heterotrophic protist that inhabits the world's oceans and is sometimes responsible for harmful red tides. The phylogenetic position of the noctilucids has been widely disputed because of two alternative views based on morphological characters and phylogenetic analyses using SSU rDNA. Specifically, noctilucids are either placed in a basal position within the dinoflagellates or they are seen as evolutionarily recent derivations descended from unarmored dinoflagellates in the order Gymnodiniales. Thus, the precise relationship of noctilucids to other dinoflagellates is still uncertain. In this study, we isolated beta-tubulin and heat shock protein 90 genes from N. scintillans to examine this relationship further. The deduced amino acid sequences share commonly substituted amino acids and a deletion with other dinoflagellates, but not with Perkinsus marinus or other alveolates. Although Hsp90 analysis did not give robust support, beta-tubulin analysis including an AU test, as well as combined analysis of these two amino acid sequences showed that N. scintillans is the next earliest branch after Oxyrrhis marina, within the dinoflagellates. Given the phylogenetic position of N. scintillans, its extremely specialized diploid trophont, and the primitive dinoflagellate-like characteristics of its haploid zoospore, we propose that noctilucids are a possible evolutionary link between ancestral diploid dinoflagellates and haploid core dinoflagellates. This implies that the transition from diploidy to haploidy in trophonts probably occurred via neoteny of a noctilucid-like zoospore. (C) 2007 Elsevier GmbH. All rights reserved.

リンク情報
DOI
https://doi.org/10.1016/j.ejop.2007.07.001
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000254116700003&DestApp=WOS_CPL
ID情報
  • DOI : 10.1016/j.ejop.2007.07.001
  • ISSN : 0932-4739
  • eISSN : 1618-0429
  • Web of Science ID : WOS:000254116700003

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