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Research Article
Identification of the septate junction protein gliotactin in the mosquito, Aedes aegypti: evidence for a role in increased paracellular permeability in larvae
Sima Jonusaite, Scott P. Kelly, Andrew Donini
Journal of Experimental Biology 2017 : jeb.156125 doi: 10.1242/jeb.156125 Published 21 April 2017
Sima Jonusaite
Department of Biology, York University, Toronto, Ontario, Canada
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  • For correspondence: artks@yorku.ca
Scott P. Kelly
Department of Biology, York University, Toronto, Ontario, Canada
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Andrew Donini
Department of Biology, York University, Toronto, Ontario, Canada
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Abstract

Septate junctions (SJs) regulate paracellular permeability across invertebrate epithelia. However, little is known about the function of SJ proteins in aquatic invertebrates. In this study, a role for the transmembrane SJ protein gliotactin (Gli) in the osmoregulatory strategies of larval mosquito (Aedes aegypti) was examined. Differences in gli transcript abundance were observed between the midgut, Malpighian tubules (MT), hindgut and anal papillae (AP) of A. aegypti, which are epithelia that participate in larval mosquito osmoregulation. Western blotting of Gli revealed its presence in monomer, putative dimer and alternatively processed protein forms in different larval mosquito organs. Gli localized to the entire SJ domain between midgut epithelial cells and showed a discontinuous localization along the plasma membranes of epithelial cells of the rectum as well as the syncytial AP epithelium. In the MT, Gli immunolocalization was confined to SJs between the stellate and principal cells. Rearing larvae in 30% seawater caused an increase in Gli protein abundance in the anterior midgut, MT and hindgut. Transcriptional knockdown of gli using dsRNA reduced Gli protein abundance in the midgut and increased the flux rate of the paracellular permeability marker, polyethylene glycol (MW 400 Da; PEG-400). Data suggest that in larval A. aegypti, Gli participates in the maintenance of salt and water balance and that one role for Gli is to participate in the regulation of paracellular permeability across the midgut of A. aegypti in response to changes in environmental salinity.

  • Received January 9, 2017.
  • Accepted April 11, 2017.
  • © 2017. Published by The Company of Biologists Ltd
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Keywords

  • Larval mosquito
  • Osmoregulation
  • Midgut permeability
  • Septate junctions
  • Gliotactin

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Identification of the septate junction protein gliotactin in the mosquito, Aedes aegypti: evidence for a role in increased paracellular permeability in larvae
Sima Jonusaite, Scott P. Kelly, Andrew Donini
Journal of Experimental Biology 2017 : jeb.156125 doi: 10.1242/jeb.156125 Published 21 April 2017
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Identification of the septate junction protein gliotactin in the mosquito, Aedes aegypti: evidence for a role in increased paracellular permeability in larvae
Sima Jonusaite, Scott P. Kelly, Andrew Donini
Journal of Experimental Biology 2017 : jeb.156125 doi: 10.1242/jeb.156125 Published 21 April 2017

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