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Insect's intestinal organ for symbiont sorting.

Tsubasa Ohbayashi1, Kazutaka Takeshita2, Wataru Kitagawa2

  • 1Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan;

Proceedings of the National Academy of Sciences of the United States of America
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Summary

Researchers discovered a novel animal organ in the bean bug

Keywords:
Burkholderiaflagellar motilitygut symbiosispartner choicestinkbug

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Area of Science:

  • Microbiology and Zoology
  • Insect-microbe interactions
  • Symbiotic relationships

Background:

  • Host-symbiont associations are crucial for organismal adaptation and diversification.
  • Hosts require mechanisms for selective microbial partner incorporation and maintenance.
  • Beneficial symbiotic bacteria often colonize specific host organs.

Purpose of the Study:

  • To identify and characterize a previously unrecognized animal organ involved in symbiont sorting.
  • To investigate the mechanisms of selective symbiont incorporation in the bean bug Riptortus pedestris.
  • To understand the role of host and symbiont factors in symbiont discrimination.

Main Methods:

  • Oral administration of labeled symbionts (GFP- Burkholderia) and non-symbionts (E. coli) to nymphal stinkbugs.
  • Use of food coloring to trace fluid passage through the insect's midgut.
  • Transposon mutagenesis in symbionts to identify genes involved in passage through the sorting organ.

Main Results:

  • A constricted region in the posterior midgut acts as a symbiont sorting organ, separating symbiotic and non-symbiotic regions.
  • The organ selectively allows beneficial Burkholderia symbionts to pass while blocking food fluid and non-symbiotic E. coli.
  • Symbiont flagella-related genes are essential for passage through the host's sorting organ, indicating a role for symbiont motility.

Conclusions:

  • The Riptortus pedestris midgut possesses a specialized organ for selective symbiont sorting.
  • This organ ensures the accommodation of beneficial symbionts while excluding non-symbiotic microbes and food.
  • The conserved nature of this organ in stinkbugs suggests an ancient evolutionary origin for host-symbiont specificity mechanisms.