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Mitochondrial DNA sequence evolution in sharks: rates, patterns, and phylogenetic inferences

¹Department of Biological Sciences, University of Nevada, Las Vegas 89154-4004, USA.

Molecular Biology and Evolution

|November 1, 1995

Summary

Shark molecular evolution, particularly the cytochrome b gene, reveals significant substitution rate variation and homoplasy. Despite these challenges, evolutionary history signals are detectable through shared transversions and amino acid replacements.

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Area of Science:

Marine biology
Evolutionary biology
Molecular evolution

Background:

Sharks are well-represented in the fossil record, making them ideal for studying molecular evolution.
Understanding molecular evolution aids in evaluating phylogenetic inference methods.

Purpose of the Study:

Describe the molecular evolution of the cytochrome b gene in sharks.
Evaluate phylogenetic analysis results using molecular data against an independent phylogeny.

Main Methods:

Analysis of the cytochrome b gene in diverse shark lineages.
Phylogenetic analysis of molecular data.
Comparison with an independently derived shark phylogeny.

Main Results:

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Significant substitution rate variation observed across divergent shark lineages.

Evidence of departure from compositional equilibrium and substantial homoplasy in the cytochrome b gene.

Detection of evolutionary history signals through shared transversions and amino acid replacements.

Conclusions:

Molecular data from sharks exhibit complexities like rate variation and homoplasy.
Despite complexities, reliable signals of evolutionary history can be extracted from shark molecular data.