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The faster-X effect: integrating theory and data.

Richard P Meisel1, Tim Connallon

  • 1Cornell University, Ithaca, NY 14853, USA. rpm16@cornell.edu

Trends in Genetics : TIG
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PubMed
Summary
This summary is machine-generated.

The faster-X effect, where sex chromosomes evolve faster than autosomes, is common across diverse species. This phenomenon offers insights into genetic variation and natural selection, though discrepancies with current models remain.

Keywords:
X chromosomedominancegenetics of adaptationnatural selection

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Area of Science:

  • Evolutionary biology
  • Population genetics
  • Genomics

Background:

  • Population genetics theory suggests sex chromosomes (X or Z) may drive speciation and divergence.
  • Genome-wide studies reveal instances where sex-linked divergence surpasses autosomal divergence, termed the 'faster-X effect'.

Purpose of the Study:

  • To review the current theoretical and empirical landscape of faster-X evolution.
  • To identify areas of agreement and disagreement between empirical findings and population genetic models.

Main Methods:

  • Literature review and synthesis of existing theoretical predictions.
  • Analysis of empirical data from genome-wide studies across diverse taxa.

Main Results:

  • The faster-X effect is a widespread phenomenon observed in numerous evolutionary lineages.
  • Observed patterns provide insights into the role of mutation dominance and the nature of selected genetic variation.
  • Discrepancies exist between empirical observations and current population genetic models.

Conclusions:

  • The faster-X effect is a pervasive evolutionary pattern with implications for understanding adaptation.
  • Further theoretical modeling and genomic data collection are needed to resolve discrepancies and advance the field.