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Evolution of primate gene expression.

Philipp Khaitovich1, Wolfgang Enard, Michael Lachmann

  • 1Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, D-04103 Leipzig, Germany.

Nature Reviews. Genetics
|August 22, 2006
PubMed
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Gene expression evolution between species is largely explained by a neutral model. However, testes show strong positive selection, and brain expression evolved uniquely in human ancestors.

Area of Science:

  • Evolutionary biology
  • Genomics
  • Molecular biology

Background:

  • Phenotypic differences between species, especially humans and apes, are thought to arise primarily from evolutionary changes in gene expression.
  • Understanding the general rules governing gene expression evolution is crucial for deciphering species divergence.

Purpose of the Study:

  • To investigate the governing principles of gene expression evolution.
  • To establish a null hypothesis for transcriptome and genome evolution.

Main Methods:

  • Analysis of gene expression data from different species.
  • Application of a neutral model incorporating negative selection and divergence time.
  • Comparative analysis of gene expression patterns in various tissues, including testes and brain.

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Main Results:

  • A neutral model, considering negative selection and divergence time, serves as a robust null hypothesis for both transcriptome and genome evolution.
  • Testes exhibit significant positive selection influencing gene expression in both humans and chimpanzees.
  • Brain gene expression shows less change compared to other organs, with potential acceleration in human ancestors.

Conclusions:

  • Neutral evolutionary processes are primary drivers of gene expression evolution across the genome.
  • Specific tissues like testes and brain display distinct evolutionary dynamics, highlighting the role of positive selection and lineage-specific adaptations.