Societies to genes: can we get there from here?

Area of Science:

• Evolutionary biology
• Genetics
• Behavioral ecology

Background:

• Social complexity arises from mechanisms across multiple biological levels.
• Understanding honey bee social organization requires linking individual traits to genes.

Purpose of the Study:

• To investigate the genetic and phenotypic architecture of social traits in honey bees.
• To understand how colony-level selection shapes complex social behaviors.

Main Methods:

• A 30-year forward genetic approach using colony-level selection for pollen storage.
• Integration of individual behavior, physiology, and quantitative trait locus (QTL) mapping.
• Gene expression analysis and knockdown of candidate genes.

Main Results:

• Identified an integrated phenotypic architecture influencing foraging behavior.
• QTL mapping revealed pleiotropy and epistasis, suggesting genetic integration of the phenotype.
• A tyramine receptor was confirmed as a pleiotropic gene under selection.

Conclusions:

• Colony-level selection can reverse-engineer complex social phenotypes.
• Pleiotropic genes, like the tyramine receptor, play a key role in social evolution.
• This study provides a comprehensive understanding of honey bee social organization and evolution.