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Antimicrobial peptides and cell processes tracking endosymbiont dynamics.

Florent Masson1, Anna Zaidman-Rémy1, Abdelaziz Heddi2

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|May 11, 2016
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Insects manage symbiotic bacteria using specialized cells called bacteriocytes. These cells control bacterial populations through antimicrobial peptides and cellular processes like apoptosis and autophagy.

Keywords:
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Area of Science:

  • Microbiology
  • Insect Biology
  • Evolutionary Ecology

Background:

  • Insects host intracellular symbiotic bacteria providing essential nutrients.
  • Endosymbiont genomes shrink during coevolution, losing virulence genes.
  • Host immune system evolution towards symbiont tolerance is poorly understood.

Purpose of the Study:

  • Review recent advances in bacteriocyte regulators for endosymbiont maintenance.
  • Focus on immune and cellular mechanisms in cereal weevils (Sitophilus spp.).
  • Elucidate how insects control intracellular bacterial partners.

Main Methods:

  • Compilation of recent research on bacteriocyte function.
  • Focus on immune and cellular regulators in Sitophilus spp. bacteriocytes.
  • Analysis of bacteriome organ evolution and function.

Main Results:

  • Bacteriocytes sequester endosymbionts, preventing systemic immune exposure.
  • Sitophilus spp. bacteriomes adapt structure and number to host needs.
  • Endosymbiont dynamics are regulated by local antimicrobial peptide synthesis and cellular processes (apoptosis, autophagy).

Conclusions:

  • Compartmentalization in bacteriocytes is a key insect strategy for managing endosymbionts.
  • Antimicrobial peptides regulate endosymbiont cytokinesis for homeostasis.
  • Apoptosis and autophagy fine-tune symbiont load with host development, balancing costs and benefits.