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Fractal genomics of SOD1 evolution
1ImmunoCure, Karachi, Pakistan. msaeed@immunocure.pk.
Immunogenetics
|November 25, 2020
Summary
Superoxide dismutase-1 (SOD1) gene evolution exhibits fractal patterns, not simple repetition and mutation. These findings suggest new methods for studying genome evolution.
Area of Science:
- Genomics
- Evolutionary Biology
- Bioinformatics
Background:
- Gene evolution is shaped by mutations and duplications.
- Understanding the statistical properties of gene sequences is crucial for evolutionary studies.
Purpose of the Study:
- To investigate the fractal organization and statistical topography of superoxide dismutase-1 (SOD1) orthologous sequences.
- To determine the impact of point mutations and segmental duplications on gene evolution using SOD1 as a model.
Main Methods:
- Analysis of 50 SOD1 orthologous sequences.
- Application of fractal analysis and sliding window k-mer analysis.
- Comparison with random sequence generation models.
Main Results:
- SOD1 orthologs display scale-invariant self-similarity and long-range correlations, indicative of fractal organization.
- Phylogenetic analysis is altered when sequences are grouped by fractal measures.
- K-mer analysis reveals predominantly unique sequences with minimal duplications, and limited contribution from simpler species to complex ones.
- Point mutations associated with amyotrophic lateral sclerosis do not disrupt the fractal structure of human SOD1.
Conclusions:
- SOD1 evolution is not driven by a simple model of repetitive sequences modified by point mutations.
- Fractal and statistical topography methods offer novel approaches for analyzing genome evolution and origins.
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