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Lifespan Predicts Mitochondrial Substitution Rates across Vertebrates, but Methodology Matters.

Jess E Sterling1, Kendra D Zwonitzer1, Justin C Havird1,2

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Long-lived species exhibit slower mitochondrial DNA (mtDNA) evolution, suggesting reduced mutation rates preserve mitochondrial integrity. However, specific mutation processes or selection on mitochondrial genes do not explain this longevity link.

Keywords:
comparative genomicsgeneration timelongevitymitochondrial DNAphylogenetic comparative methodssubstitution rates

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Area of Science:

  • Evolutionary biology
  • Gerontology
  • Mitochondrial biology

Background:

  • The mitochondrial theory of aging proposes that accumulated mutations in mitochondrial DNA (mtDNA) reduce mitochondrial efficiency over time.
  • Experimental evidence supporting this theory is inconsistent, necessitating alternative approaches like evolutionary analyses.

Purpose of the Study:

  • To investigate the relationship between mitochondrial DNA (mtDNA) evolution and species' lifespans across diverse taxa.
  • To determine if reduced mtDNA mutation rates are associated with increased longevity in vertebrates.

Main Methods:

  • Comparative evolutionary analyses of mtDNA substitution rates across four clades: Aves, Actinopterygii, Bivalvia, and Sebastidae.
  • Application of five distinct normalization strategies to account for divergence, generation time, and phylogenetic effects.
  • Analysis of mitochondrial DNA mutation spectra to identify specific mutation process patterns.

Main Results:

  • Long-lived vertebrates generally displayed reduced synonymous and nonsynonymous substitution rates in mtDNA across most normalization methods.
  • The strength and direction of the observed relationships between mtDNA substitution rates and lifespan were highly dependent on the normalization strategy employed.
  • No significant differences in mtDNA mutation spectra were observed between long- and short-lived species, and selection on mitochondrial protein-coding genes showed little correlation with lifespan.

Conclusions:

  • Decreased mtDNA mutation rates may contribute to maintaining mitochondrial integrity in long-lived vertebrate species.
  • Long-lived species do not appear to possess enhanced oxidative phosphorylation (OXPHOS) efficiency or specialized protection against specific mitochondrial mutation processes.
  • Mitochondrial stability is critically linked to lifespan, with natural evolutionary patterns offering insights into aging mechanisms.