Unusual features of dinokaryon, the enigmatic nucleus of dinoflagellates

Yasuhiro Fukuda, Toshinobu Suzaki

研究成果: Chapter

6 被引用数 (Scopus)

抄録

The dinoflagellate is a member of the eukaryotes that belong to a diverged protist group, Alveolata. Because the nuclei show several unusual features not observed in other eukaryotes, the nucleus in the "core" or typical dinoflagellate is especially called a "dinokaryon". Chromosomes in the dinokaryon are condensed throughout the whole cell cycle and show a cholesteric liquid crystal organization. Its nucleosome lacks the "beads on a string" structure which is commonly observed in eukaryotic nuclei. Despite the existence of canonical histone protein-coding genes, those proteins are not found in the dinokaryon, while certain proteins showing amino acid sequences similar to bacterial or viral proteins are abundantly contained in the dinokaryon. The dinoflagellate genome carries some rare bases such as 5-hydroxymethyluracil, and TTTT repeats exist as a possible transcription initiator element instead of the TATA box. A comprehensive transcriptome analysis of the EST database using a variety of dinoflagellates including ancestral to divergent species showed that SL trans-splicing is required for transcript maturation.

本文言語English
ホスト出版物のタイトルMarine Protists
ホスト出版物のサブタイトルDiversity and Dynamics
出版社Springer Japan
ページ23-45
ページ数23
ISBN(電子版)9784431551300
ISBN(印刷版)9784431551294
DOI
出版ステータスPublished - 2015 10 23

ASJC Scopus subject areas

  • 農業および生物科学(全般)
  • 環境科学(全般)
  • 地球惑星科学(全般)
  • 工学(全般)

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