Strong Purifying Selection in Transmission of Mammalian Mitochondrial DNA
2008
Mitigating Mutational Meltdown in Mammalian Mitochondria
Sample size: 190
publication
Evidence: high
Author Information
Author(s): David M. Rand
Primary Institution: Brown University
Hypothesis
How have mitochondria avoided a mutational meltdown, or at least significant declines in fitness?
Conclusion
The study shows that strong purifying selection acts on mitochondrial DNA to remove deleterious mutations in mice.
Supporting Evidence
- The overall dN/dS ratio was 0.6035, indicating purifying selection against deleterious mutations.
- Patterns of variation across codon positions were similar to those found in human mtDNAs.
- Selection to remove amino acid changes occurs rapidly in mouse pedigrees.
Takeaway
Mice can get sick from bad mutations in their DNA, but their bodies are really good at getting rid of those bad mutations quickly.
Methodology
The researchers sequenced the complete mtDNAs from 190 mice in a pedigree to analyze mutation patterns.
Participant Demographics
The study involved a pedigree of mice, specifically focusing on a knock-in mouse model with a mutation in mitochondrial DNA polymerase.
Statistical Information
P-Value
0.6035
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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