絞り込み

16645

広告

Cyanobacterial genes transmitted to the nucleus before divergence of red algae in the Chromista.

著者 Nozaki H , Matsuzaki M , Misumi O , Kuroiwa H , Hasegawa M , Higashiyama T , Shin-I T , Kohara Y , Ogasawara N , Kuroiwa T
J Mol Evol.2004 Jul ; 59(1):103-13.
この記事をPubMed上で見るPubMedで表示
この記事をGoogle翻訳上で見る Google翻訳で開く

Department of Biological Sciences, Graduate School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. nozaki@biol.s.u-tokyo.ac.jp

スターを付ける スターを付ける     (75view , 0users)

Full Text Sources

Research Materials

NBRP resources

The plastids of red algae, green plants, and glaucophytes may have originated directly from a cyanobacterium-like prokaryote via primary endosymbiosis. In contrast, the plastids of other lineages of eukaryotic phototrophs appear to be the result of secondary or tertiary endosymbiotic events involving a phototrophic eukaryote and a eukaryotic host cell. Although phylogenetic analyses of multiple plastid genes from a wide range of eukaryotic lineages have been carried out, the phylogenetic positions of the secondary plastids of the Chromista (Heterokontophyta, Haptophyta and Cryptophyta) are ambiguous in a range of different analyses. This ambiguity may be the result of unusual substitutions or bias in the plastid genes established by the secondary endosymbiosis. In this study, we carried out phylogenetic analyses of five nuclear genes of cyanobacterial origin (6-phosphogluconate dehydrogenase [gnd], oxygen-evolving-enhancer [psbO], phosphoglycerate kinase [pgk], delta-aminolevulinic acid dehydratase [aladh], and ATP synthase gamma [atpC] genes), using the genome sequence data from the primitive red alga Cyanidioschyzon merolae 10D. The sequence data robustly resolved the origin of the cyanobacterial genes in the nuclei of the Chromista (Heterokontophyta and Haptophyta) and Dinophyta, before the divergence of the extant red algae (including Porphyra [Rhodophyceae] and Cyanidioschyzon [Cyadidiophyceae]). Although it is likely that gnd genes in the Chromista were transmitted from the cyanobacterium-like ancestor of plastids in the primary endosymbiosis, other genes might have been transferred from nuclei of a red algal ancestor in the secondary endosymbiosis. Therefore, the results indicate that the Chromista might have originated from the ancient secondary endosymbiosis before the divergence of extant red algae.
PMID: 15383913 [PubMed - indexed for MEDLINE]
印刷用ページを開く Endnote用テキストダウンロード