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Mutation, selection and the future of human evolution.

Floyd A Reed1, Charles F Aquadro

  • 1Department of Biology, University of Maryland, College Park, MD 20742, USA. freed@umd.edu

Trends in Genetics : TIG
|July 22, 2006
PubMed
Summary
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Human ancestors experienced positive selection, while modern humans face negative selection against harmful mutations. Additional factors like inbreeding may explain these evolutionary pressures, suggesting ongoing and intensifying selection in the future.

Area of Science:

  • Evolutionary genetics
  • Human population genetics
  • Molecular evolution

Background:

  • Recent analyses indicate significant positive selection acting on human ancestors.
  • Neutral variation across the human genome is best explained by incorporating negative selection against deleterious mutations.

Purpose of the Study:

  • To explore factors contributing to high deleterious mutation rates in humans.
  • To investigate the role of inbreeding and prezygotic selection alongside existing models.
  • To predict the future trajectory of human evolution over the next millennia.

Main Methods:

  • Analysis of genomic variation data.
  • Modeling of selection pressures, including positive and negative selection.
  • Inclusion of factors like inbreeding and prezygotic selection in evolutionary models.

Related Experiment Videos

Main Results:

  • Evidence supports positive selection in human ancestors and negative selection in modern humans.
  • High deleterious mutation rates may necessitate considering additional factors like inbreeding and prezygotic selection.
  • Certain forms of selection are likely still active and may intensify in modern humans.

Conclusions:

  • Human evolution is shaped by both positive and negative selection pressures.
  • Inbreeding and prezygotic selection are crucial factors in understanding human genetic variation.
  • Human evolution is an ongoing process with potential for intensified selection in the future.