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Shrimp Glucose-6-phosphatase 2 (G6Pase 2): a second isoform of G6Pase in the Pacific white shrimp and regulation of G6Pase 1 and 2 isoforms via HIF-1 during hypoxia and reoxygenation in juveniles

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Abstract

Animals suffer hypoxia when their oxygen consumption is larger than the oxygen available. Hypoxia affects the white shrimp Penaeus (Litopenaeus) vannamei, both in their natural habitat and in cultivation farms. Shrimp regulates some enzymes that participate in energy production pathways as a strategy to survive during hypoxia. Glucose-6-phosphatase (G6Pase) is key to maintain blood glucose homeostasis through gluconeogenesis and glycogenolysis. We previously reported a shrimp G6Pase gene (G6Pase1) and in this work, we report a second isoform that we named G6Pase2. The expression of the two isoforms was evaluated in oxygen limited conditions and during silencing of the transcription factor HIF-1. High G6Pase activity was detected in hepatopancreas followed by muscle and gills under good oxygen and feeding conditions. Gene expression of both isoforms was analyzed in normoxia, hypoxia and reoxygenation in hepatopancreas and gills, and in HIF-1-silenced shrimp. In fed shrimp with normal dissolved oxygen (DO) (5.0 mg L− 1 DO) the expression of G6Pase1 was detected in gills, but not in hepatopancreas or muscle, while G6Pase2 expression was undetectable in all three tissues. In hepatopancreas, G6Pase1 is induced at 3 and 48 h of hypoxia, while G6Pase2 is down-regulated in the same time points but in reoxygenation, both due to the knock-down of HIF-1. In gills, only G6Pase1 was detected, and was induced by the silencing of HIF-1 only after 3 h of reoxygenation. Therefore, the expression of the two isoforms appears to be regulated by HIF-1 at transcriptional level in response to oxygen deprivation and subsequent recovery of oxygen levels.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We are grateful for funding to CONACyT, Ciencia Básica grant A1-S-24557 to GYP, and for Ph.D. studies to LEHA. We thank Dr. S. Gómez-Jiménez, Biologists A. Gamez-Alejo, M.C.J. Zamorano-Apodaca of the Marine Invertebrates Physiology Laboratory of CIAD for technical help provided in the hypoxia bioassays.

Funding

This study was funded by the National Science and Technology Council, Mexico (CONACyT), grant Ciencia Básica A1-S-24557 to GYP and a scholarship for Ph.D studies to LEHA.

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Contributions

LEHA performed the experiments, data analysis and writing of original draft. JDG performed the HIF-1 silencing bioassay. ABPU supervised gene expression experiments and methodology, gave helpful suggestions, critically revised and approved the final manuscript. LLC and EVS helped with the enzyme activity assays, MEB supervised the statistical analysis. GYP conceived, designed and supervised the experiments, critically revised, edited and approved the final manuscript.

Corresponding author

Correspondence to Gloria Yepiz-Plascencia.

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The shrimp bioassay was done following international recommendations for animals handling and experimentation https://arriveguidelines.org. The bioassay facility laboratory is certified by EMA (Entidad Mexicana de Acreditación) SA-0758-030/16 to perform marine animal tests.

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The authors declare no competing or financial interest.

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Hernández-Aguirre, L.E., Peregrino-Uriarte, A.B., Duarte-Gutiérrez, J.L. et al. Shrimp Glucose-6-phosphatase 2 (G6Pase 2): a second isoform of G6Pase in the Pacific white shrimp and regulation of G6Pase 1 and 2 isoforms via HIF-1 during hypoxia and reoxygenation in juveniles. J Bioenerg Biomembr 55, 137–150 (2023). https://doi.org/10.1007/s10863-023-09960-z

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  • DOI: https://doi.org/10.1007/s10863-023-09960-z

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