Codons AGA and AGG are read as glycine in ascidian mitochondria

Shin ichi Yokobori, Takuya Ueda, Kimitsuna Watanabe*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


A 1.2-kb DNA fragment of the cytochrome oxidase subunit I (CO I) gene of mitochondria isolated from an ascidian, Halocynthia roretzi, was amplified by polymerase chain reaction (PCR) and sequenced. Codons AGA and AGG appeared in its reading frame, indicating that these are sense codons in this organelle. Sequence comparisons with the corresponding regions of other animal mitochondrial CO I genes suggest that codons AGA and AGG correspond to glycine in the ascidian mitochondrial genome, but not to serine as in most invertebrate genomes, nor to stops as in vertebrate genomes. The other codons are identical to those of vertebrate mitochondria.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalJournal of Molecular Evolution
Issue number1
Publication statusPublished - 1993 Jan
Externally publishedYes


  • AGR glycine codon
  • Ascidian
  • Codon reassignment
  • Genetic code
  • Mitochondria
  • tRNA

ASJC Scopus subject areas

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


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