The effect of DNA methylation on bumblebee colony development

Area of Science:

• Epigenetics
• Behavioral Ecology
• Developmental Biology

Background:

• DNA methylation is crucial in eukaryotes, but its role in bee behavior and colony development is not fully understood.
• Previous studies show altered DNA methylation affects worker dominance and reproduction, yet global impacts on caste determination remain unclear.
• Investigating decitabine's effect on bumblebee colonies addresses challenges in controlling genetic variation.

Purpose of the Study:

• To investigate the effect of the methylation-altering agent decitabine on the developmental rate of full bumblebee colonies.
• To assess differences in DNA methylation status using whole genome bisulfite sequencing.

Main Methods:

• Treatment of bumblebee colonies with decitabine, a DNA methylation inhibitor.
• Whole genome bisulfite sequencing to analyze genome-wide DNA methylation patterns.
• Comparison of methylation status and colony developmental traits between treated and control groups.

Main Results:

• Decitabine treatment resulted in fewer methylated loci compared to controls.
• 22 CpG loci showed significant differential methylation (>10%) between treated and control workers, involved in neuron function, oocyte regulation, and metabolic processes.
• Treated colonies exhibited faster development and increased worker numbers, but reduced male production compared to control colonies.

Conclusions:

• Altered DNA methylation patterns in bumblebees can enhance worker cooperation.
• No evidence of abnormal worker dominance or caste determination was observed.
• Decitabine treatment impacts colony development and sex allocation, suggesting epigenetic regulation of social insect traits.