Partial Mitochondrial Genome Organization of the Heterostrophan Gastropod Omalogyra atomus and its Systematic Significance

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  • KURABAYASHI Atsushi
    Institute of Biological Sciences, University of Tsukuba
  • UESHIMA Rei
    Department of Biological Science, Graduate School of Science, University of Tokyo:PRESTO, Japan Science and Technology Corporation

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  • 異旋類 Omalogyra atomus (ミジンワダチガイ類) のミトコンドリア DNA ゲノム構造とその系統学的意義

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Abstract

The total mitochondrial genome of a heterostrophan gastropod Omalogyra atomus was cloned and 4, 456 bp of the nucleotide sequence was determined. The sequenced region was shown to contain 17 genes for 10 tRNAs (tRNA^<Arg>, tRNA^<Asn>, tRNA^<Glu>, tRNA^<Gln>, tRNA^<His>, tRNA^<Ile>, tRNA^<Leu(UUR)>, tRNA^<Thr>, tRNA^<Trp>, and tRNA^<Phe>) and 6 proteins (ATPase6, ATPase8, COII, COIII, ND2 and ND4), and one rRNA (srRNA). The arrangement of these mt-encoded genes is quite different from that of the prosobranch gastropoda Littorina but shows a remarkable similarity to those of euthyneuran gastropods. Based on an outgroup comparision, the unique gene orders shared by O. atomus, some pulmonates and an opishobranch can be regarded as novel synapomorphies of heterobranch gastropods. The present data is well consistent with the recent anatomical studies suggesting heterobranch affinity of the family Omalogyridae. Several Omalogyra mt-tRNA genes show unusual secondary structures. Post-transcriptional RNA editing seems to be operating in some Omalogyra mt-tRNAs as well as euthyneuran gastropods.

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