Transposable element islands facilitate adaptation to novel environments in an invasive species

Nat Commun. 2014 Dec 16;5:5495. doi: 10.1038/ncomms6495.


Adaptation requires genetic variation, but founder populations are generally genetically depleted. Here we sequence two populations of an inbred ant that diverge in phenotype to determine how variability is generated. Cardiocondyla obscurior has the smallest of the sequenced ant genomes and its structure suggests a fundamental role of transposable elements (TEs) in adaptive evolution. Accumulations of TEs (TE islands) comprising 7.18% of the genome evolve faster than other regions with regard to single-nucleotide variants, gene/exon duplications and deletions and gene homology. A non-random distribution of gene families, larvae/adult specific gene expression and signs of differential methylation in TE islands indicate intragenomic differences in regulation, evolutionary rates and coalescent effective population size. Our study reveals a tripartite interplay between TEs, life history and adaptation in an invasive species.

Publication types

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

MeSH terms

  • Adaptation, Physiological
  • Animals
  • Ants / genetics*
  • Biological Evolution
  • Brazil
  • DNA Methylation
  • DNA Transposable Elements*
  • Exons
  • Gene Deletion
  • Gene Duplication
  • Genes, Insect*
  • Genome, Insect*
  • Genomic Islands*
  • Introduced Species*
  • Japan
  • Phylogeography
  • Polymorphism, Single Nucleotide


  • DNA Transposable Elements

Associated data

  • BioProject/PRJNA237579