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Varroa chemosensory proteins: Some conserved across Arthropoda but others are Arachnid specific.
Insect Molecular Biology 2018 November 17
The tight synchronization between the life cycle of the obligatory parasitic mite Varroa destructor (Varroa) and its host, the honeybee, is mediated by honeybee chemical stimuli. These stimuli are mainly perceived by a pit organ located at the distal part of the mite's foreleg. In the present study, we searched for Varroa chemosensory molecular components by comparing transcriptomic and proteomic profiles between forelegs from different physiological stages, and rear legs. In general, a comparative transcriptomic analysis showed a clear separation of the expression profiles between the rear legs and the three groups of forelegs (phoretic, reproductive and tray-collected mites). Most of the differentially expressed transcripts and proteins in the mite's foreleg were previously uncharacterized. Using a conserved domain approach, we identified 45 transcripts with known chemosensory domains belonging to seven chemosensory protein families, of which 16 were significantly up regulated in the mite's forelegs when compared to rear legs. These are soluble and membrane bound proteins, including the somewhat ignored receptors of degenerin/epithelial Na+ channels (ENaCs) and transient receptor potentials (TRPs). Phylogenetic clustering and expression profiles of the putative chemosensory proteins, suggest their role in chemosensation and shed light on the evolution of these proteins in Chelicerata. This article is protected by copyright. All rights reserved.
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