Origin and Evolution of Genes in Eukaryotes: Mechanisms, Dynamics, and Functional Implications

Area of Science:

• Evolutionary Biology
• Genomics
• Molecular Biology

Background:

• Gene origin and evolution are fundamental to understanding biological complexity and adaptation.
• Molecular innovations drive evolutionary processes and shape life's diversity.

Purpose of the Study:

• To review the principal mechanisms of gene emergence in eukaryotes.
• To examine population dynamics, functional integration, and selective forces on new genes.
• To highlight the role of nuclear architecture and the human pangenome in gene innovation.

Main Methods:

• Review of principal mechanisms: gene duplication, de novo birth, horizontal gene transfer, viral gene domestication, exon shuffling.
• Analysis of population dynamics, fixation, functional integration, and selection pressures.
• Discussion of methodological approaches for detecting new genes and inferring selection.

Main Results:

• Gene duplication and de novo birth, exemplified by NOTCH2NL and SRGAP2C, contribute to human brain development.
• Nuclear architecture influences the evolutionary trajectory of novel genes.
• The human pangenome offers new perspectives on hidden gene diversity.

Conclusions:

• Gene innovation is a dynamic process shaped by multiple mechanisms and influenced by nuclear architecture.
• Understanding gene origin is crucial for evolutionary insights and biomedical research, including disease susceptibility.
• Emerging approaches like pangenomics enhance our view of gene diversity and evolution.