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Selection Acting on Genomes.

Carolin Kosiol1,2, Maria Anisimova3,4

  • 1Centre of Biological Diversity, School of Biology, University of St Andrews, Fife, UK. ck202@st-andrews.ac.uk.

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|July 7, 2019
PubMed
Summary
This summary is machine-generated.

New mutations can drive rapid genome evolution, especially in immunity genes, through positive selection. This study explores methods for detecting positive selection across genomes using probabilistic models and new genome-wide data.

Keywords:
Codon modelsConserved and accelerated regionsPolymorphism-aware phylogenetic modelsPositive selection scansSelection-mutation models

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Population genetics

Background:

  • Organismal populations evolve through mutations that can become fixed via random drift or positive selection.
  • Positive selection favors beneficial mutations, leading to rapid genome evolution, particularly in genes related to immunity and defense.
  • Genome-wide scans for selection have significantly advanced our understanding of species' evolutionary trajectories.

Purpose of the Study:

  • To review and discuss methods for detecting selection acting on genomes.
  • To highlight the role of probabilistic models in identifying genomic regions under selection.
  • To examine how advancements in genome-wide data have impacted these detection methods.

Main Methods:

  • Focus on probabilistic models for detecting selection.
  • Discussion of how these models are adapted for new genome-wide data.
  • Exploration of genome-wide scans as a tool for evolutionary inference.

Main Results:

  • Regions of the genome experiencing positive selection evolve more rapidly.
  • Immunity and defense genes are frequently cited examples of rapid evolution driven by selection.
  • Modern genome-wide data enables more powerful detection of selection across the entire genome.

Conclusions:

  • Understanding the mechanisms of selection is crucial for comprehending genome evolution.
  • Probabilistic models, enhanced by genome-wide data, are key to identifying evolutionary processes like positive selection.
  • The study of selection provides insights into adaptation and the "arms race" between species and their pathogens.