Insect symbiosis and bacterial influences

Many insects carry bacteria not as pathogens but as permanent residents, living inside their cells and shaping nearly every aspect of their biology, from reproduction to immunity. Wolbachia, the most widespread of these endosymbionts, infects an estimated half of all insect species and can manipulate host reproduction, block viral replication, and even drive its own spread through entire populations — properties now being tested as tools to suppress mosquito-borne diseases like dengue and malaria. Understanding how these partnerships formed, how bacterial and insect genomes have co-evolved over millions of years, and how the broader microbiota collectively influences host fitness are all active lines of inquiry. A central open question is how to distinguish mutualism from manipulation — that is, when a symbiont's effects genuinely benefit the host versus when they persist simply because the bacterium has made itself impossible to evict.

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Keywords

WolbachiaSymbiontBacterialInsectMicrobiotaGenome Evolution