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The lepidopteran mitochondrial control region: structure and evolution

M F Taylor1, S W McKechnie, N Pierce

  • 1Department of Ecology and Evolutionary Biology, Princeton University.

Molecular Biology and Evolution
|November 1, 1993
PubMed
Summary
This summary is machine-generated.

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Mitochondrial control regions in lepidoptera show conserved length but low sequence similarity, hindering phylogenetic analysis. This conservation may explain the lack of heteroplasmy in their mitochondrial genomes.

Area of Science:

  • Genomics
  • Evolutionary Biology
  • Entomology

Background:

  • Mitochondrial control regions are crucial for replication and transcription.
  • Lepidoptera, a diverse insect order, offers a model for studying evolutionary processes.
  • Rapid speciation events can complicate phylogenetic reconstructions based on sequence data.

Purpose of the Study:

  • To determine mitochondrial control-region sequences for several lepidopteran species.
  • To investigate sequence conservation and secondary structures within these regions.
  • To explore potential relationships between control-region characteristics and heteroplasmy in lepidopteran mitochondrial genomes.

Main Methods:

  • Sequencing of approximately 350-bp mitochondrial control-region DNA for multiple lepidopteran species.

Related Experiment Videos

  • Comparative sequence analysis to assess divergence among closely related species (Jalmenus genus) and across genera.
  • Secondary structure prediction and analysis of inferred stem-loop structures.
  • Determination of flanking sequences for one Jalmenus species to examine rRNA structure and tRNA translocation.

    • Main Results:

    • Low interspecific sequence divergence was observed within the Jalmenus genus, preventing robust phylogenetic construction.
    • Despite conserved length, primary sequences of control regions showed limited conservation across lepidopteran genera and with Drosophila.
    • Inferred stem loops with higher-than-random folding energies were the only common secondary structure feature, but their positions varied.
    • Flanking sequence analysis provided weak support for existing insect 12S rRNA models and indicated frequent tRNA translocation events.

    Conclusions:

    • Conserved mitochondrial control-region length in lepidoptera may be linked to the absence of heteroplasmy.
    • Limited sequence conservation and variable secondary structures highlight rapid evolution in these regions.
    • Tandem repeat arrays and tRNA translocations are significant factors in insect mitochondrial genome evolution.