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タイトル
  • Origins of a cyanobacterial 6-phosphogluconate dehydrogenase in plastid-lacking eukaryotes
  • en Origins of a cyanobacterial 6-phosphogluconate dehydrogenase in plastid-lacking eukaryotes
作成者
    • 渡辺, 正勝
    • e-Rad 40124226
    • MARUYAMA, Shinichiro
    • MISAWA, Kazuharu
    • ISEKI, Mineo
    • WATANABE, Masakatsu
    • NOZAKI, Hisayoshi
権利情報
  • © 2008 Maruyama et al; licensee BioMed Central Ltd.
内容注記
  • Other application/pdf
  • Abstract Background Plastids have inherited their own genomes from a single cyanobacterial ancestor, but the majority of cyanobacterial genes, once retained in the ancestral plastid genome, have been lost or transferred into the eukaryotic host nuclear genome via endosymbiotic gene transfer. Although previous studies showed that cyanobacterial gnd genes, which encode 6-phosphogluconate dehydrogenase, are present in several plastid-lacking protists as well as primary and secondary plastid-containing phototrophic eukaryotes, the evolutionary paths of these genes remain elusive. Results Here we show an extended phylogenetic analysis including novel gnd gene sequences from Excavata and Glaucophyta. Our analysis demonstrated the patchy distribution of the excavate genes in the gnd gene phylogeny. The Diplonema gene was related to cytosol-type genes in red algae and Opisthokonta, while heterolobosean genes occupied basal phylogenetic positions with plastid-type red algal genes within the monophyletic eukaryotic group that is sister to cyanobacterial genes. Statistical tests based on exhaustive maximum likelihood analyses strongly rejected that heterolobosean gnd genes were derived from a secondary plastid of green lineage. In addition, the cyanobacterial gnd genes from phototrophic and phagotrophic species in Euglenida were robustly monophyletic with Stramenopiles, and this monophyletic clade was moderately separated from those of red algae. These data suggest that these secondary phototrophic groups might have acquired the cyanobacterial genes independently of secondary endosymbioses. Conclusion We propose an evolutionary scenario in which plastid-lacking Excavata acquired cyanobacterial gnd genes via eukaryote-to-eukaryote lateral gene transfer or primary endosymbiotic gene transfer early in eukaryotic evolution, and then lost either their pre-existing or cyanobacterial gene.
出版者 BioMed Central
日付
    Issued2008-05-17
言語
  • eng
資源タイプ journal article
出版タイプ VoR
資源識別子 URI https://ir.soken.ac.jp/records/3328
関連
  • isIdenticalTo DOI https://doi.org/10.1186/1471-2148-8-151 10.1186/1471-2148-8-151
  • URI http://www.biomedcentral.com/about/license Copyright
収録誌情報
    • ISSN 14712148
      • BMC Evolutionary Biology en BMC Evolutionary Biology
      • 巻8 号1
ファイル
コンテンツ更新日時 2023-08-18