How Enzyme Function Affects Evolution in Mammals
Author Information
Author(s): Corey M Hudson, Gavin C Conant
Primary Institution: University of Missouri
Hypothesis
Mammals would have evolved in a manner similar to Drosophila, where there is a significant association between enzyme centrality and evolutionary constraint.
Conclusion
The strength of selective constraint acting on mammalian genes is quite variable and does not appear to exclusively follow patterns seen in other organisms.
Supporting Evidence
- Metabolic genes are under greater selective constraint than non-metabolic genes.
- The cellular compartment of an enzyme influences its evolutionary rate.
- There is a weak correlation between gene expression levels and selective constraint in mammals.
Takeaway
This study found that how important an enzyme is in the body affects how much it changes over time, but it's not the only factor.
Methodology
The study measured selective constraints using the ratio of nonsynonymous to synonymous substitutions (Ka/Ks) across various mammalian enzymes and their metabolic functions.
Potential Biases
Potential biases may arise from the methods used to identify orthologs and the assumptions made in estimating selective constraints.
Limitations
The study's conclusions may not apply universally across all genes and organisms due to the complexity of evolutionary factors.
Participant Demographics
The study analyzed genes from eight eutherian mammals including humans, chimpanzees, macaques, mice, rats, horses, dogs, and cows.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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