Ancient bacterial endosymbionts of insects: Genomes as sources of insight and springboards for inquiry.


Journal Article (Review)

Ancient associations between insects and bacteria provide models to study intimate host-microbe interactions. Currently, a wealth of genome sequence data for long-term, obligately intracellular (primary) endosymbionts of insects reveals profound genomic consequences of this specialized bacterial lifestyle. Those consequences include severe genome reduction and extreme base compositions. This minireview highlights the utility of genome sequence data to understand how, and why, endosymbionts have been pushed to such extremes, and to illuminate the functional consequences of such extensive genome change. While the static snapshots provided by individual endosymbiont genomes are valuable, comparative analyses of multiple genomes have shed light on evolutionary mechanisms. Namely, genome comparisons have told us that selection is important in fine-tuning gene content, but at the same time, mutational pressure and genetic drift contribute to genome degradation. Examples from Blochmannia, the primary endosymbiont of the ant tribe Camponotini, illustrate the value and constraints of genome sequence data, and exemplify how genomes can serve as a springboard for further comparative and experimental inquiry.

Full Text

Duke Authors

Cited Authors

  • Wernegreen, JJ

Published Date

  • September 2017

Published In

Volume / Issue

  • 358 / 2

Start / End Page

  • 427 - 432

PubMed ID

  • 28454877

Pubmed Central ID

  • 28454877

Electronic International Standard Serial Number (EISSN)

  • 1090-2422

International Standard Serial Number (ISSN)

  • 0014-4827

Digital Object Identifier (DOI)

  • 10.1016/j.yexcr.2017.04.028


  • eng