A 100%-complete sequence reveals unusually simple genomic features in the hot-spring red alga Cyanidioschyzon merolae

Hisayoshi Nozaki, Hiroyoshi Takano, Osami Misumi, Kimihiro Terasawa, Motomichi Matsuzaki, Shinichiro Maruyama, Keiji Nishida, Fumi Yagisawa, Yamato Yoshida, Takayuki Fujiwara, Susumu Takio, Katsunori Tamura, Sung Jin Chung, Soichi Nakamura, Haruko Kuroiwa, Kan Tanaka, Naoki Sato, Tsuneyoshi Kuroiwa

研究成果: Article査読

211 被引用数 (Scopus)

抄録

Background: All previously reported eukaryotic nuclear genome sequences have been incomplete, especially in highly repeated units and chromosomal ends. Because repetitive DNA is important for many aspects of biology, complete chromosomal structures are fundamental for understanding eukaryotic cells. Our earlier, nearly complete genome sequence of the hot-spring red alga Cyanidioschyzon merolae revealed several unique features, including just three ribosomal DNA copies, very few introns, and a small total number of genes. However, because the exact structures of certain functionally important repeated elements remained ambiguous, that sequence was not complete. Obviously, those ambiguities needed to be resolved before the unique features of the C. merolae genome could be summarized, and the ambiguities could only be resolved by completing the sequence. Therefore, we aimed to complete all previous gaps and sequence all remaining chromosomal ends, and now report the first nuclear-genome sequence for any eukaryote that is 100% complete. Results: Our present complete sequence consists of 16546747 nucleotides covering 100% of the 20 linear chromosomes from telomere to telomere, representing the simple and unique chromosomal structures of the eukaryotic cell. We have unambiguously established that the C. merolae genome contains the smallest known histone-gene cluster, a unique telomeric repeat for all chromosomal ends, and an extremely low number of transposons. Conclusion: By virtue of these attributes and others th at we had discovered previously, C. merolae appears to have the simplest nuclear genome of the non-symbiotic eukaryotes. These unusually simple genomic features in the 100% complete genome sequence of C. merolae are extremely useful for further studies of eukaryotic cells.

本文言語English
論文番号28
ジャーナルBMC Biology
5
DOI
出版ステータスPublished - 2007 7月 10
外部発表はい

ASJC Scopus subject areas

  • バイオテクノロジー
  • 構造生物学
  • 生態、進化、行動および分類学
  • 生理学
  • 生化学、遺伝学、分子生物学(全般)
  • 農業および生物科学(全般)
  • 植物科学
  • 発生生物学
  • 細胞生物学

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