Expression of chemosensory proteins in the tsetse fly Glossina morsitans morsitans is related to female host-seeking behaviour

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Liu, R. ; He, X. ; Lehane, Stella ; Lehane, Mike ; Hertz-Fowler, C. ; Berriman, M. ; Field, L. M. ; Zhou, J.-J. (2012)
  • Publisher: Wiley
  • Journal: INSECT MOLECULAR BIOLOGY, volume 21, issue 1, pages 41-48 (issn: 0962-1075, eissn: 1365-2583)
  • Related identifiers: doi: 10.1111/j.1365-2583.2011.01114.x, pmc: PMC3664020
  • Subject: trypanosomiasis | qx_45 | chemosensory protein | qu_500 | Original Articles | tsetse fly | qx_505 | nagana | gene expression | qu_58.5
    mesheuropmc: animal structures | fungi | parasitic diseases

Chemosensory proteins (CSPs) are a class of soluble proteins present in high concentrations in the sensilla of insect antennae. It has been proposed that they play an important role in insect olfaction by mediating interactions between odorants and odorant receptors. Here we report, for the first time, the presence of five CSP genes in the tsetse fly Glossina morsitans morsitans, a major vector transmitting nagana in livestock. Real-time quantitative reverse transcription PCR showed that three of the CSPs are expressed in antennae. One of them, GmmCSP2, is transcribed at a very high level and could be involved in olfaction. We also determined expression in the antennae of both males and females at different life stages and with different blood feeding regimes. The transcription of GmmCSP2 was lower in male antennae than in females, with a sharp increase in 10-week-old flies, 48 h after a bloodmeal. Thus there is a clear relationship between CSP gene transcription and host searching behaviour. Genome annotation and phylogenetic analyses comparing G. morsitans morsitans CSPs with those of other Diptera showed rapid evolution after speciation of mosquitoes.
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