title: Nonsynonymous site heteroplasmy in fish mitochondrial DNA.
abstract: Heteroplasmic nucleotide polymorphisms are rarely observed in wild animal mitochondrial DNA. The occurrence of such site heteroplasmy is expected to be extremely rare at nonsynonymous sites where the number of nucleotide substitutions per site is low due to functional constraints. This report deals with nonsynonymous mitochondrial heteroplasmy from two wild fish species, chum salmon and Japanese flounder. We detected an A/C nonsynonymous heteroplasmic site corresponding to putative amino acids, Ile or Met, in NADH dehydrogenase subunit-5 (ND5) region of chum salmon. The heteroplasmic site was at the 3rd position of 58th codon. As for Japanese flounder we detected a C/T nonsynonymous heteroplasmic site corresponding to putative amino acids, Leu or Pro, in ND4 region. The heteroplasmic site was at the 2nd position of 450th codon. We also verified heteroplasmy at these sites by sequencing cloned fragments.
authors.affiliation: Department of Fisheries Science, Kitasato University, Ofunato, Iwate, Japan. yshig@affrc.go.jp
authors.forename: Yuya
authors.initials: Y
authors.lastname: Shigenobu
authors.forename: Kenji
authors.initials: K
authors.lastname: Saitoh
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Hayashizaki
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Ida
mesh_terms: D019943:Amino Acid Substitution; D000818:Animals; D001483:Base Sequence; D003062:Codon / Q000235:genetics; D004272:DNA, Mitochondrial / Q000235:genetics*; D005412:Flatfishes / Q000235:genetics*; D008969:Molecular Sequence Data; D009245:NADH Dehydrogenase / Q000235:genetics*; D017685:Oncorhynchus keta / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide
chemical_list: D003062:Codon; D004272:DNA, Mitochondrial; D009245:NADH Dehydrogenase