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Pheromone-mediated gene expression in the honey bee brain
Christina M Grozinger1, Noura M Sharabash, Charles W Whitfield
1Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. grozinge@staff.uiuc.edu
Summary
Queen mandibular pheromone (QMP) alters gene expression in worker honey bees, influencing their transition from nursing to foraging. This pheromone robustly regulates genes, impacting social behaviors.
Area of Science:
- Insect behavior
- Neurogenomics
- Chemical ecology
Background:
- Queen mandibular pheromone (QMP) is a key social pheromone in honey bees.
- Understanding pheromone-mediated gene regulation is crucial for deciphering social insect behavior.
Purpose of the Study:
- To investigate if QMP induces changes in adult worker honey bee brain gene expression.
- To correlate QMP-induced gene expression changes with behavioral responses, specifically the delay in foraging.
Main Methods:
- Cage experiments and field studies with honey bee colonies.
- Analysis of gene expression changes in response to QMP exposure.
- Comparison of QMP-regulated genes with previously identified nurse and forager gene sets.
Main Results:
- QMP transiently regulated hundreds of genes and chronically regulated 19 genes in the worker bee brain.
- QMP-regulated genes were validated in both laboratory and field settings.
- QMP activated "nursing genes" and repressed "foraging genes," suggesting a role in delaying behavioral maturation.
- A kruppel homolog 1 gene was significantly regulated by QMP, particularly in mushroom bodies.
Conclusions:
- QMP chronically regulates gene expression in the honey bee brain, impacting social behavior.
- Genomic approaches can link pheromone perception to behavioral outcomes.
- QMP plays a role in modulating the transition to foraging behavior by regulating specific gene networks.