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Related Experiment Videos

Horizontal transfer and selection in the evolution of P elements.

J C Silva1, M G Kidwell

  • 1Interdisciplinary Program in Genetics, University of Arizona, Tucson, AR 85721, USA. joana@u.arizona.edu

Molecular Biology and Evolution
|October 6, 2000
PubMed
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Recent horizontal transfer events shaped the evolution of canonical P-elements in Drosophila, with weak selection acting on these mobile genetic elements. This suggests horizontal transfer is a significant driver of P-element diversification in eukaryotes.

Area of Science:

  • Evolutionary biology
  • Genetics
  • Molecular evolution

Background:

  • P-elements are mobile genetic elements with a complex evolutionary history.
  • Understanding the roles of selection and horizontal transfer is crucial for P-element evolution.

Purpose of the Study:

  • To investigate the evolutionary dynamics of the canonical P-element subfamily in Drosophila saltans and willistoni species groups.
  • To determine the relative contributions of selection and horizontal transfer to P-element evolution.

Main Methods:

  • Phylogenetic analysis of P-element sequences.
  • Estimation of divergence times and selection pressures (dN/dS ratios).
  • Reconstruction of horizontal transfer events.

Main Results:

Related Experiment Videos

  • The common ancestor of the canonical P-element subfamily is estimated to be recent (≤3 Myr).
  • Weak purifying selection was detected at nonsynonymous sites, with no selective constraints at synonymous sites.
  • High similarity among P-elements in different species suggests recent horizontal transfer events (≥11 events in 3 Myr).

Conclusions:

  • Recent horizontal transfer is the primary driver for the evolution and diversification of the canonical P-element subfamily.
  • Selective constraints on P-elements appear to be imposed during or shortly after horizontal transfer.
  • Horizontal transfer may be a more frequent mechanism in eukaryotic genome evolution than previously thought.