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*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)692-702
Number of pages11
JournalJournal of Molecular Evolution
Issue number6
Publication statusPublished - 1999 Jul 1
Externally publishedYes


  • Cephalopoda
  • Gene organization
  • Mitochondrial DNA
  • Mollusca
  • Unusual genetic code
  • tRNA punctuation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics


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