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A Protocol for Using Gene Set Enrichment Analysis to Identify the Appropriate Animal Model for Translational Research
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Comparative analysis of context-dependent mutagenesis using human and mouse models.

Sofya A Medvedeva1, Alexander Y Panchin, Andrey V Alexeevski

  • 1Department of Bioengineering and Bioinformatics, Moscow State University, Vorbyevy Gory 1-73, Moscow 119992, Russia.

Biomed Research International
|September 24, 2013
PubMed
Summary

Mutation patterns vary between species, even closely related ones like humans and mice. Understanding these differences in nucleotide context is crucial for evolutionary studies and accurate molecular clocks.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Mutagenesis

Background:

  • Substitution rates are influenced by nucleotide context, with known examples like C>T mutations in the CG context.
  • Recent discoveries in the human genome identified new hypermutable motifs, including T>C in ATTG/ATAG and A>C in ACAA.
  • Investigating the conservation of these mutation regularities across species is vital for evolutionary models.

Purpose of the Study:

  • To determine if recently identified human hypermutable motifs are conserved in other vertebrates.
  • To compare context-dependent mutation regularities in humans and mice.
  • To assess the impact of species-specific mutation patterns on evolutionary models and molecular clocks.

Main Methods:

  • Systematic comparison of mutation regularities within 2-4 base pair (bp) contexts.
  • Utilizing large-scale mutation data derived from genome comparisons and single nucleotide polymorphism (SNP) databases.
  • Analysis focused on Homo sapiens and Mus musculus.

Main Results:

  • Significant differences in context-dependent mutation regularities were observed between humans and mice.
  • Even closely related species exhibit notable variations in mutation patterns.
  • The findings suggest that some mutation regularities may not be universally conserved across vertebrates.

Conclusions:

  • Context-dependent mutation regularities can differ substantially between closely related species.
  • Current substitution models and molecular clocks may require re-evaluation based on species-specific mutation data.
  • Further research is needed to understand the evolutionary implications of divergent mutagenesis patterns.