Testing the kinship theory of intragenomic conflict in honey bees (Apis mellifera)

Sexual reproduction brings genes from two parents (matrigenes and patrigenes) together into one individual. These genes, despite being unrelated, should show nearly perfect cooperation because each gains equally through the production of offspring. However, an individual’s matrigenes and patrigenes...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2016-01, Vol.113 (4), p.1020-1025
Main Authors: Galbraith, David A., Kocher, Sarah D., Glenn, Tom, Albert, Istvan, Hunt, Greg J., Strassmann, Joan E., Queller, David C., Grozinger, Christina M.
Format: Article
Language:English
Subjects:
Animal behavior
Animals
Apis mellifera
Bees
Bees - genetics
Bees - physiology
Biological Sciences
Crosses, Genetic
DNA Methylation
Family
Female
Gene expression
Genomics
Insects
Male
Polymorphism, Single Nucleotide
Reproduction
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Summary:Sexual reproduction brings genes from two parents (matrigenes and patrigenes) together into one individual. These genes, despite being unrelated, should show nearly perfect cooperation because each gains equally through the production of offspring. However, an individual’s matrigenes and patrigenes can have different probabilities of being present in other relatives, so kin selection could act on them differently. Such intragenomic conflict could be implemented by partial or complete silencing (imprinting) of an allele by one of the parents. Evidence supporting this theory is seen in offspring–mother interactions, with patrigenes favoring acquisition of more of the mother’s resources if some of the costs fall on half-siblings who do not share the patrigene. The kinship theory of intragenomic conflict is little tested in other contexts, but it predicts that matrigene–patrigene conflict may be rife in social insects. We tested the hypothesis that honey bee worker reproduction is promoted more by patrigenes than matrigenes by comparing across nine reciprocal crosses of two distinct genetic stocks. As predicted, hybrid workers show reproductive trait characteristics of their paternal stock, (indicating enhanced activity of the patrigenes on these traits), greater patrigenic than matrigenic expression, and significantly increased patrigenic-biased expression in reproductive workers. These results support both the general prediction that matrigene–patrigene conflict occurs in social insects and the specific prediction that honey bee worker reproduction is driven more by patrigenes. The success of these predictions suggests that intragenomic conflict may occur in many contexts where matrigenes and patrigenes have different relatednesses to affected kin.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1516636113