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Dynamics of Transcription Factor Binding Site Evolution.

Murat Tuğrul1, Tiago Paixão1, Nicholas H Barton1

  • 1Institute of Science and Technology Austria, Klosterneuburg, Austria.

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This summary is machine-generated.

The evolution of transcription factor binding sites (TFBS) is slow, especially for longer sites, challenging evolutionary assumptions. However, longer regulatory regions and cooperativity can accelerate TFBS evolution.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Molecular biology

Background:

  • Gene regulation drives phenotypic differences between species and individuals.
  • Transcription factor binding sites (TFBS) are key to gene expression and heritable variation.
  • Understanding TFBS evolution is crucial for evolutionary and genetic studies.

Purpose of the Study:

  • To model the rates of transcription factor binding site (TFBS) gain and loss under selection.
  • To investigate the impact of mutation types, TFBS length, and interaction specificity on TFBS evolution.
  • To reconcile theoretical TFBS evolution rates with comparative genomics timescales.

Main Methods:

  • Developed a biophysical model for directional selection on gene expression.
  • Estimated rates of TFBS gain and loss in finite populations.
  • Incorporated point mutations and insertion/deletion mutations.

Main Results:

  • Rates of TFBS gain and loss are generally slow for single sites, requiring strong selection.
  • Increasing TFBS length or protein-DNA interaction specificity drastically reduces evolution rates.
  • Evolution to equilibrium binding sequences is slow, questioning equilibrium assumptions.

Conclusions:

  • The evolution of TFBS longer than ~10 bp is unlikely on typical eukaryotic speciation timescales.
  • Factors like longer regulatory sequences, pre-existing sites, and transcription factor cooperativity can facilitate TFBS evolution.
  • Theoretical models need to account for these factors to match genomic observations.