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Abstract

Transcriptomic Analysis of Differentially Expressed Genes in Kidney and Intestine of Dicentrarchus labrax Fed Different Nutritional Amounts of Inorganic Phosphate †

1
Centro de Ciências do Mar (CCMAR), Universidade do Algarve, 8005-139 Faro, Portugal
2
Department of Biotechnology and Aquaculture, Institute of Marine research (IMM-CSIC), 36208 Vigo, Spain
3
Escuela de Medicina, Universidad de Magallanes, Punta Arenas 01855, Chile
*
Author to whom correspondence should be addressed.
Presented at the IX Iberian Congress of Ichthyology, Porto, Portugal, 20–23 June 2022.
Presenting author (Poster presentation).
Biol. Life Sci. Forum 2022, 13(1), 17; https://doi.org/10.3390/blsf2022013017
Published: 6 June 2022
(This article belongs to the Proceedings of The IX Iberian Congress of Ichthyology)

Abstract

:
Phosphorus (P), in the form of inorganic phosphate (Pi), is one of the most important macronutrients for all organisms, including fish. It is indispensable for the formation of hard tissues such as bones, but also for cell signalling and cell membrane formation, and energy transduction, among many other functions and is kept under well-controlled conditions, since its deficiency or overload may lead to skeletal malformation or ectopic calcification, disturbances of intermediary metabolism, growth and function impairment, endocrine dysfunction, and eventually death. Fish feeds used in aquaculture are therefore P-rich but excess/unused/excreted P in the effluents can lead to eutrophication and a consequent deleterious change in the aquatic ecosystem. The objective of this study was to evaluate the expression profiles and transcripts modified by dietary P, to identify pathways and mechanisms involved in P transport and regulation in the kidney and intestine. Juvenile Dicentrarchus labrax were fed using a commercial feed (1.1% P) or tailored-made feeds containing 0.05%, 1.1%, or 3% Pi. Fish (duplicate tanks, n = 10) were fed for 70 days and weighed periodically to evaluate growth changes. Kidney and intestine were used for RNA extraction. Next-Generation Sequencing and RNAseq library preparation were performed in an Illumina system following the manufacturer’s recommendations. Annotation was performed using the available sea bass genome assembly. Bioinformatic analysis showed significant differences in expression patterns among the three conditions tested in both tissues. In the kidney, increased P led to a total of 135 differentially expressed genes (DEGs; 82 up and 53 down), while only 54 (11 up and 43 down) genes responded to P restriction. In the intestine, high P affected the expression of 50 genes (16 up and 34 down) whereas only 26 (6 up and 20 down) were modified by low P. However, DEGs between high and low P were 156 in kidney and 154 in intestine. Preliminary analysis suggests the most affected pathways were those involved in cellular metabolism and phosphorylation but also on the structure of cell membranes, either for maintaining membrane integrity or in genes related to transmembrane ion transport. We expect this research to reveal the molecular implications of dietary P imbalance looking at specific targets such as membrane transporters and regulatory factors, but also to the larger metabolic pathways affected in these two key organs for P uptake and excretion.

Author Contributions

Conceptualization, P.M.G.; methodology, S.S., B.L., L.G., P.M.G.; formal analysis, C.V-L., S.S., B.L., L.G., P.M.G., M.M.d.O.; investigation, S.S., A.A., L.G., C.V.-L.; resources, P.M.G., J.R.; data curation, C.V.-L., S.S., B.L., L.G.; writing—original draft preparation, P.M.G., C.V.-L.; writing—review and editing, P.M.G., C.V.-L.; supervision, P.M.G., J.R.; project administration, P.M.G.; funding acquisition, P.M.G. All authors have read and agreed to the published version of the manuscript.

Funding

Funded by Fundação para a Ciência e Tecnologia (FCT), grant number PTDC/BIA-ANM/4225/2012 and FCT-UIDB/04326/2021.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Conflicts of Interest

The authors declare no conflict of interest.
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MDPI and ACS Style

Vargas-Lagos, C.; Silva, S.; Guerrero, L.; Montes de Oca, M.; Louro, B.; Alves, A.; Rotllant, J.; Guerreiro, P.M. Transcriptomic Analysis of Differentially Expressed Genes in Kidney and Intestine of Dicentrarchus labrax Fed Different Nutritional Amounts of Inorganic Phosphate. Biol. Life Sci. Forum 2022, 13, 17. https://doi.org/10.3390/blsf2022013017

AMA Style

Vargas-Lagos C, Silva S, Guerrero L, Montes de Oca M, Louro B, Alves A, Rotllant J, Guerreiro PM. Transcriptomic Analysis of Differentially Expressed Genes in Kidney and Intestine of Dicentrarchus labrax Fed Different Nutritional Amounts of Inorganic Phosphate. Biology and Life Sciences Forum. 2022; 13(1):17. https://doi.org/10.3390/blsf2022013017

Chicago/Turabian Style

Vargas-Lagos, Carolina, Sandra Silva, Laura Guerrero, Marco Montes de Oca, Bruno Louro, Alexandra Alves, Josep Rotllant, and Pedro M. Guerreiro. 2022. "Transcriptomic Analysis of Differentially Expressed Genes in Kidney and Intestine of Dicentrarchus labrax Fed Different Nutritional Amounts of Inorganic Phosphate" Biology and Life Sciences Forum 13, no. 1: 17. https://doi.org/10.3390/blsf2022013017

APA Style

Vargas-Lagos, C., Silva, S., Guerrero, L., Montes de Oca, M., Louro, B., Alves, A., Rotllant, J., & Guerreiro, P. M. (2022). Transcriptomic Analysis of Differentially Expressed Genes in Kidney and Intestine of Dicentrarchus labrax Fed Different Nutritional Amounts of Inorganic Phosphate. Biology and Life Sciences Forum, 13(1), 17. https://doi.org/10.3390/blsf2022013017

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