Dataset Information

Honey bee heat-shock proteomics

ABSTRACT: Honey bee colonies were maintained in an apiary at the University of British Columbia. During the summer of 2018, 40 queens were reared from a single colony and half were allowed to open mate, while the other half were kept as virgins in plastic queen cages. Two weeks after emergence, the virgin queens were given two, eight-minute carbon dioxide treatments on 2 sequential days, then re-introduced to their nucleus colonies. This process stimulates virgin queens to begin laying71, and we conducted these treatments in order to minimize the physiological differences between virgin and mated queens. Virgin and mated queens were retrieved from their nucleus colonies and half of each (10) were subjected to heat-shock (42 ͦC, 2 h), and then maintained at 30 ͦC for 2 d. The other half were held only at 30 ͦC for 2 d. Four to six weeks after mating, the queens were anesthetized with carbon dioxide, beheaded, then their spermathecae (including the tracheal net) were removed with fine forceps. Both ovaries were also removed and weighed. During the same summer, 200 drones from a different colony in the same apiary were collected and maintained in the laboratory overnight at ambient temperature with excess syrup (50% sucrose). The next day, semen was harvested with glass capillaries according to the methods described above. Because many drones were not sexually mature, 60 semen samples (out of the 200 drones) were collected. Capillaries were placed in petri dishes and half (30) were heat-shocked as described above, then kept at 25 ͦC for 2 d. The other half were only kept at 25 ͦC for 2 d. Ten samples from each experimental group were used for sperm viability assays as described above.

INSTRUMENT(S): 6520 Quadrupole Time-of-Flight LC/MS

ORGANISM(S): Apis Mellifera (honeybee)

SUBMITTER: Alison McAfee

LAB HEAD: Leonard Foster

PROVIDER: PXD013728 | Pride | 2019-07-19

REPOSITORIES: Pride

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Project description:In many animals living in groups the reproductivestatus of individuals is determined by their social status. In specieswith social hierarchies, the death of dominant individuals typicallyupheaves the social hierarchy and provides an opportunity for subordinateindividuals to improve their social status. Such a phenomenon occursin the monogyne form of the fire ant\emph{, Solenopsis invicta, }wherecolonies typically contain a single wingless reproductive queen, thousandsof workers and hundreds of winged non-reproductive virgin queens.Upon the death of the mother queen, many virgin queens shed theirwings and initiate reproductive development instead of departing ona mating flight. Workers progressively execute almost all of themover the following weeks. The workers base their collective decisionon pheromonal cues associated with the onset of reproductive developmentof the virgin queens which occurs after orphaning. To examine the factors that determine which virgin queens are executed and which survive, we set up artificial competitions between queens from different colonies. Using microarrays, we found that queens from winning colonies showed higher mitochondrial as well as organ development activities 24 hours after orphaning than did queens from colonies that lost the competitions. Furthermore, queens from colonies where queens shed their wings faster after orphaning were more likely to survive competitions. Finally, higher wing shedding speed is linked to higher mitochondrial activity. Eight competitions were initially conducted between queens form pairs of colonies. Six competitions clearly identified one winning colony and one losing colony. We thus have microarray data for six competitions (ie biological replicates), with one winning and one losing colony within each competition. Thus 12 colonies total. For each colony, RNA extracted from five queens was pooled, and hybridized against an unrelated common reference RNA that had been made from a pool of many S. invicta individuals of all castes and developmental stages. Lab work was conducted in blocks (by competition) with randomized order within competition to avoid introducing bias. No technical replication was performed.

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Honey bee heat-shock proteomics

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