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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Animal Evolution

Background:

  • Mitochondrial genome architecture is remarkably conserved in some animal lineages but variable in others.
  • The evolutionary drivers behind this architectural disparity remain largely unknown.

Purpose of the Study:

  • To investigate the influence of locomotory capacity and parasitic lifestyle on animal mitochondrial genome evolutionary rates.
  • To explore factors contributing to variability in mitochondrial genome architecture across bilaterians.

Main Methods:

  • Analysis of over 10,000 bilaterian mitochondrial genomes.
  • Comparative analysis of gene order rearrangement and sequence evolution rates.
  • Assessment of correlations between architectural evolution and ecological factors like locomotion and parasitism.

Main Results:

  • Double-stranded architecture is likely ancestral for major animal radiations.
  • Over twenty transitions to single-stranded architectures and state-reversals were identified.
  • Gene order and sequence evolution rates correlate positively and are accelerated in single-stranded genomes, parasites, and species with low locomotory capacity.
  • Mitogenome size negatively correlates with evolutionary rates; effective population size is decoupled.
  • Endotherms show slower evolution than ectotherms in Bilateria, but faster in Chordata.

Conclusions:

  • Ecological factors, particularly locomotory capacity and parasitic lifestyle, are major drivers of mitochondrial genome architectural evolution through purifying selection.
  • While ecological pressures are significant, other variables are necessary for a complete understanding of observed patterns.