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Related Experiment Videos

Do essential genes evolve slowly?

L D Hurst1, N G Smith

  • 1Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK. l.d.hurst@bath.ac.uk

Current Biology : CB
|July 27, 1999
PubMed
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Gene knockout severity does not predict evolutionary rate. Essential and non-essential genes evolve similarly, with nervous system and immune system genes showing distinct evolutionary patterns.

Area of Science:

  • Evolutionary biology
  • Genomics
  • Molecular evolution

Background:

  • Genes are classified as essential or non-essential based on knockout phenotypes.
  • Non-essential genes are predicted to evolve faster due to weaker stabilizing selection.
  • Previous studies suggested a correlation between gene essentiality and evolutionary rate.

Purpose of the Study:

  • To investigate the relationship between gene knockout phenotype severity and molecular evolutionary rates.
  • To determine if non-essential genes evolve faster than essential genes.
  • To identify factors influencing gene evolutionary rates beyond knockout phenotype.

Main Methods:

  • Comparative analysis of molecular evolution for 108 non-essential and 67 essential mouse genes sequenced in both mouse and rat.

Related Experiment Videos

  • Statistical correction for biases, including the overrepresentation of immune-system genes in the non-essential class.
  • Comparison of evolutionary rates between neuron-specific genes and other genes.

    • Main Results:

    • Initial analysis suggested non-essential genes evolve faster, but this was attributed to immune-system gene bias.
    • After correction, gene evolutionary rate did not correlate with knockout phenotype severity.
    • Neuron-specific genes exhibited significantly lower rates of evolution, irrespective of essentiality.

    Conclusions:

    • Strong selection acts against even subtle deleterious phenotypes, influencing evolutionary rates.
    • Host-parasite coevolution and nervous system gene expression are significant drivers of gene evolution variance.
    • Knockout phenotype severity is a less significant predictor of evolutionary rate than previously thought.