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Summary
Genomic DNA analysis reveals two evolutionary paths: lower organisms exhibit "DNA lability" with high mutation rates, while higher organisms show "DNA stability" with reduced variability, reflecting distinct adaptation strategies.
Area of Science:
- Evolutionary Biology
- Genomics
- Molecular Biology
Background:
- Organismal evolution is influenced by internal and external factors.
- Distinct adaptation strategies, openness and autonomization, differentiate higher and lower organisms.
- Genomic DNA's structural-functional features correlate with these adaptation types.
Purpose of the Study:
- To compare structural-functional features of genomic DNAs across different organisms.
- To elucidate the role of internal and external factors in organismal evolution.
- To establish a correlation between genomic DNA organization and adaptation types.
Main Methods:
- Comparative analysis of genomic DNA structural-functional features.
- Estimation of internal and external factor roles in evolution.
- Correlation analysis between DNA organization and adaptation types.
Main Results:
- A fundamental difference in reaction to external factors between higher and lower organisms was demonstrated.
- Higher organisms utilize "autonomization" (DNA stability), while lower organisms use "openness" (DNA lability).
- Genomic DNA of lower organisms is characterized by high mutation ability ("DNA lability"), and higher organisms by reduced variability ("DNA stability").
Conclusions:
- Two principal evolutionary pathways exist, linked to genomic DNA characteristics.
- "DNA lability" in lower organisms facilitates adaptation through high variability.
- "DNA stability" in higher organisms supports a constant genetic apparatus and reduced variability.