Figure 1

Gene content, organization, and variability of Theragra mitochondrial genomes. (A) Linear map of the circular mtDNA. All genes, except ND6 and 8 of the transfer RNA genes (indicated by the standard one-letter symbols for amino acid below the diagram), are encoded by the H-strand. Abbreviations: SSU and LSU, mitochondrial small- and large-subunit ribosomal RNA genes; ND1-6, NADH dehydrogenase subunit 1 to 6; COI-III, cytochrome c oxidase subunit I to III; A6 and A8, ATPase subunit 6 and 8; Cyt b, cytochrome b; OH and OL, origin of H-strand and L-strand replication; CR, control region containing the D-loop. (B) Distribution of variable sites in pollock mtDNA numbered according to the sequence of the Norwegian pollock Tf 19 (AM489718, Table 1). The position 834+ in SSU rDNA indicates nucleotide insertion between positions 834 and 835 in Tf 19. The variable sites were aligned to that of Tf 19. Identical sites are indicated by dots and deletions by dashes. The proposed diagnostic single nucleotide polymorphism at ND4 of Sea of Japan and Bering Sea pollocks [14] is boxed at position 11578.