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Utility and evolution of cytochrome b in insects
1Department of Entomology, University of Minnesota, 219 Hodson Hall, 1980 Folwell Avenue, St. Paul, Minnesota 55108-6125, USA.
Molecular Phylogenetics and Evolution
|July 31, 2001
Summary
Cytochrome b (cyt-b) gene is less effective for tiger moth phylogenetics than COI or 28S. Its evolutionary rates vary across insects, with accelerated rates in lice and bees.
Area of Science:
- Molecular Evolution
- Phylogenetics
- Insect Systematics
Background:
- Cytochrome b (cyt-b) is a common marker in vertebrate phylogenetics.
- Its utility in invertebrate taxa, particularly insects, is less established.
- Tiger moths (families Arctiidae and Erebidae) present complex taxonomic challenges.
Purpose of the Study:
- To evaluate the efficacy of cytochrome b (cyt-b) against COI and 28S ribosomal DNA for resolving intergeneric relationships in tiger moths.
- To investigate the evolutionary rates of cyt-b across the class Insecta.
- To assess the functional conservation of cyt-b amino acids in insects compared to vertebrates.
Main Methods:
- Comparative phylogenetic analysis using cyt-b, COI, and D1 of 28S nuclear ribosomal gene regions.
- Sequence variation and A/T bias analysis.
- Rate of nucleotide and amino acid evolution assessment across insect taxa.
- Total evidence phylogenetic tree construction.
Main Results:
- Cytochrome b (cyt-b) exhibited similar sequence variation and A/T bias to COI but was less effective in recovering intergeneric relationships within tiger moths.
- The total evidence phylogenetic analysis challenged existing classifications within the studied tiger moth tribes.
- Functional amino acid conservation in cyt-b was observed across Insecta, similar to vertebrates, except in lice (Mallophaga), which show accelerated nonsynonymous substitutions.
- Accelerated evolution of cyt-b in bees (Apidae) may correlate with higher metabolic rates and heterothermy.
Conclusions:
- Cytochrome b (cyt-b) is not the optimal marker for resolving intergeneric relationships in the studied tiger moth lineages.
- Phylogenetic utility of cyt-b varies significantly across insect groups.
- The study provides insights into the evolutionary dynamics of cyt-b and its implications for insect taxonomy and physiology.
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