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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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Muller's ratchet and gene duplication.

Fabian Freund1, Johannes Wirtz2, Yichen Zheng3

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Theoretical Population Biology
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Summary

Gene copy number varies greatly. Our model shows that gene duplication and selection can lead to stable gene family sizes or runaway evolution in finite populations, impacting genetic diversity.

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Danio rerioGene duplicationHomo sapiensMuller’s ratchetMultiplicative fitnessSynergistic epistasis

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Area of Science:

  • Population genetics
  • Molecular evolution
  • Systems biology

Background:

  • Gene copy number variability is a key driver of evolution.
  • Duplication-selection balance influences gene family dynamics.
  • Previous models like Muller's ratchet do not fully capture gene duplication complexity.

Purpose of the Study:

  • To model the interplay between gene duplication and selection.
  • To investigate the impact of different duplication mechanisms (single template vs. any copy).
  • To understand the role of population size and epistasis in gene family evolution.

Main Methods:

  • Development of a mathematical model for duplication-selection interaction.
  • Analysis of equilibrium conditions in infinite populations.
  • Simulation of finite populations to observe drift and runaway evolution.

Main Results:

  • Duplication-selection equilibrium is achieved in infinite populations, following specific distributions.
  • Finite populations are prone to 'runaway evolution' due to genetic drift, leading to unbounded copy number increase.
  • Synergistic epistasis can counteract drift and maintain equilibrium.

Conclusions:

  • Gene copy number evolution is shaped by duplication, selection, and population dynamics.
  • Finite population size and lack of epistasis can lead to uncontrolled gene duplication.
  • Empirical data on large gene families suggest complex, accelerating duplication processes.