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Related Experiment Videos

Stability and evolution of overlapping genes.

D C Krakauer1

  • 1Institute for Advanced Study, Princeton, New Jersey 08540, USA. krakauer@ias.edu

Evolution; International Journal of Organic Evolution
|August 11, 2000
PubMed
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Overlapping genes, common in viruses and bacteria, help compress genetic information and regulate gene expression. Their evolution depends on mutation rates and specific gene activation/decay kinetics.

Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Overlapping genes occur when a single nucleotide sequence codes for multiple functional polypeptides.
  • This phenomenon is prevalent in rapidly evolving genomes like viruses, bacteria, and mitochondria.
  • Overlap is hypothesized to aid in genetic information compression and regulation of gene expression via translational coupling.

Purpose of the Study:

  • To examine the stability of overlapping codes in relation to genomic mutation rates and information cost.
  • To investigate the evolutionary dynamics and conditions favoring the emergence and maintenance of gene overlap.
  • To explore how gene activation and decay kinetics influence the effectiveness of translational coupling in overlapping genes.

Main Methods:

Related Experiment Videos

  • Analysis of the stability of overlapping codes considering information cost and mutation rates.
  • Modeling the evolution of gene overlap using a cost function.
  • Investigating conditions favoring overlap based on gene activation/decay kinetics and autocatalysis.

    • Main Results:

    • The degree of overlap tends towards a monomorphic state within a population.
    • Evolution towards partial gene overlap is contingent upon a convex cost function.
    • Overlap does not evolve if gene expression is mutually exclusive and arises from rare mutations.
    • Effective coupling via overlap is favored when the leading gene decays rapidly and the induced gene decays slowly.

    Conclusions:

    • Gene overlap is a stable strategy in certain genomic contexts, balancing information density with evolutionary constraints.
    • The kinetics of gene activation, decay, and potential autocatalysis play crucial roles in the evolution and functional significance of overlapping genes.
    • Translational coupling, facilitated by gene overlap, can be a powerful mechanism for coordinating the expression of functionally related genes.