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Journal of Molecular Evolution

, Volume 48, Issue 6, pp 692–702 | Cite as

Gene Contents and Organization of a Mitochondrial DNA Segment of the Squid Loligo bleekeri

  • Junji  Sasuga
  • Shin-ichi  Yokobori
  • Masayuki  Kaifu
  • Takuya  Ueda
  • Kazuya  Nishikawa
  • Kimitsuna  Watanabe

Abstract:

The nucleotide sequence of a 9240-base pair DNA fragment of the mitochondrial (mt) genome of a squid, Loligo bleekeri, was determined, in which 8 protein and 14 tRNA genes were identified. The gene organization of the mt-genome exhibits a greater resemblance to the gene organization of arthropods and a chiton, Katharina tunicata, than to those of a mussel, Mytilus edulis, and land snails. A cloverleaf-like structure was observed between the genes for subunits 4 and 5 of NADH dehydrogenase (ND4 and -5), which is considered to have originated from histidine tRNA. It is presumed that this structure functions as a transcriptional punctuation signal for the maturation of the ND4 and ND5 mRNAs.

Key words: Mitochondrial DNA — Mollusca — Cephalopoda — Gene organization — Unusual genetic code — tRNA punctuation 

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Copyright information

© Springer-Verlag New York Inc. 1999

Authors and Affiliations

  • Junji  Sasuga
    • 1
  • Shin-ichi  Yokobori
    • 1
  • Masayuki  Kaifu
    • 1
  • Takuya  Ueda
    • 2
  • Kazuya  Nishikawa
    • 1
  • Kimitsuna  Watanabe
    • 2
  1. 1.Department of Biological Sciences, Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 226-8501, JapanJP
  2. 2.Department of Chemistry and Biotechnology, Graduate School of Engineering, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, JapanJP

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