Comparative analysis of mitochondrial genomes in genetically distinct groups of the dojo loach Misgurnus anguillicaudatus

Dojo loach (Misgurnus anguillicaudatus) that inhabit Japan are composed of two genetically divergent groups (A and B). Although most individual loach reproduce bisexually, clone lineages exist in certain populations that reproduce gynogenetically. To investigate the molecular phylogenetic relationships among the M. anguillicaudatus groups and clone lineages, complete mitogenomes of members from groups A and B and a clone lineage were sequenced using long range PCR and primer walking methods. The three groups of mitogenomes shared the same gene order and had similar base compositions and codon usage patterns. Phylogenetic analysis indicated group A and the clone lineage were genetically close with group B being genetically divergent.