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Gill proteome networks explain energy homeostasis during salinity stress in Oreochromis mossambicus
  • Larken Root,
  • Dietmar Kültz
Larken Root
University of Washington
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Dietmar Kültz
University of California Davis

Corresponding Author:dkueltz@ucdavis.edu

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Acclimations of Oreochromis mossambicus to hypersalinity were conducted with multiple rates of salinity increase and durations of exposure to determine the rate-independent maximum salinity limit and the incipient lethal salinity. Quantitative proteomics of over 3000 gill proteins simultaneously was performed to analyze molecular phenotypes associated with hypersalinity. For this purpose, a species- and tissue-specific data-independent acquisition (DIA) assay library of MSMS spectra was created. From these DIA data, protein networks representing complex molecular phenotypes associated with salinity acclimation were generated. O. mossambicus was determined to have a wide “zone of resistance” from approximately 75g/kg salinity to 120g/kg, which is tolerated for a limited period with eventual loss of organismal function. Crossing the critical threshold salinity into the zone of resistance corresponds with blood osmolality increasing beyond 400 mOsm/kg, significantly reduced body condition factor, and cessation of feeding. Gill protein networks impacted by hypersalinity include increased energy metabolism, especially upregulation of electron transport chain proteins, and regulation of specific osmoregulatory proteins. Cytoskeletal, cell adhesion, and extracellular matrix proteins are enriched in networks that are sensitive to the critical salinity threshold. Network analysis of these patterns provides deep insight into specific mechanisms of energy homeostasis during salinity stress.
01 Mar 2023Submitted to PROTEOMICS
01 Mar 2023Assigned to Editor
01 Mar 2023Submission Checks Completed
01 Mar 2023Review(s) Completed, Editorial Evaluation Pending
02 Mar 2023Reviewer(s) Assigned