The transcriptomic changes associated with the development of social parasitism in the honeybee Apis mellifera capensis
Abstract
Social insects are characterized by the division of labor. Queens usually dominate reproduction, whereas workers fulfill non-reproductive age-dependent tasks to maintain the colony. Although workers are typically sterile, they can activate their ovaries to produce their own offspring. In the extreme, worker reproduction can turn into social parasitism as in Apis mellifera capensis. These intraspecific parasites occupy a host colony, kill the resident queen, and take over the reproductive monopoly. Because they exhibit a queenlike behavior and are also treated like queens by the fellow workers, they are so-called pseudoqueens. Here, we compare the development of parasitic pseudoqueens and social workers at different time points using fat body transcriptome data. Two complementary analysis methods—a principal component analysis and a time course analysis—led to the identification of a core set of genes involved in the transition from a social worker into a highly fecund parasitic pseudoqueen. Comparing our results on pseudoqueens with gene expression data of honeybee queens revealed many similarities. In addition, there was a set of specific transcriptomic changes in the parasitic pseudoqueens that differed from both, queens and social workers, which may be typical for the development of the social parasitism in A. m. capensis.
Keywords
Worker reproduction Reproductive dominance Social parasitism Apis mellifera capensis Thelytoky PseudoqueenNotes
Acknowledgements
We are grateful to the members of the Research Unit FOR2281 “Sociality and the reversal of the fecundity-longevity trade-off,” especially to Daniel Elsner and Mark Harrison, for their valuable input regarding the data analysis. We also thank Nikita Venter, Cathy Bester, and Alex Nepomuceno for their assistance in handling the experimental bees.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
Supplementary material
References
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