The tempo and mode of evolution of transposable elements as revealed by molecular phylogenies reconstructed from mosquito genomes

Evolution. 2009 Dec;63(12):3136-46. doi: 10.1111/j.1558-5646.2009.00788.x. Epub 2009 Jul 28.

Abstract

Although many mathematical models exist predicting the dynamics of transposable elements (TEs), there is a lack of available empirical data to validate these models and inherent assumptions. Genomes can provide a snapshot of several TE families in a single organism, and these could have their demographics inferred by coalescent analysis, allowing for the testing of theories on TE amplification dynamics. Using the available genomes of the mosquitoes Aedes aegypti and Anopheles gambiae, we indicate that such an approach is feasible. Our analysis follows four steps: (1) mining the two mosquito genomes currently available in search of TE families; (2) fitting, to selected families found in (1), a phylogeny tree under the general time-reversible (GTR) nucleotide substitution model with an uncorrelated lognormal (UCLN) relaxed clock and a nonparametric demographic model; (3) fitting a nonparametric coalescent model to the tree generated in (2); and (4) fitting parametric models motivated by ecological theories to the curve generated in (3).

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, N.I.H., Intramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Bayes Theorem
  • Culicidae / classification
  • Culicidae / genetics*
  • DNA Transposable Elements*
  • Genome*
  • Phylogeny*
  • Species Specificity

Substances

  • DNA Transposable Elements