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Characterizing and evaluating the expression of the type IIb sodium-dependent phosphate cotransporter (slc34a2) gene and its potential influence on phosphorus utilization efficiency in yellow catfish (Pelteobagrus fulvidraco)

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Abstract

A sodium-dependent phosphate cotransporter gene, NaPi-IIb (slc34a2), was isolated from yellow catfish (Pelteobagrus fulvidraco) intestine through homology cloning and the rapid amplification of cDNA ends. The full-length cDNA of slc34a2 consisted of 2326 bp with an open reading frame encoding 621 amino acids, a 160-bp 5′ untranslated region, and a 300-bp 3′ untranslated region. The deduced amino acid sequence showed 79.0 and 70.9 % sequence identity to Astyanax mexicanus and Pundamilia nyererei, respectively. The membrane-spanning domains based on the hydrophilic and hydrophobic properties of the deduced amino acids were predicted, and results showed that the putative protein had eight transmembrane domains, with the intracellular NH2 and COOH termini. Two functional regions including first intracellular loop and third extracellular loop as well as the six N-glycosylation sites in second extracellular loop were found. The slc34a2 mRNA in the tested tissues was examined through semiquantitative reverse transcription polymerase chain reaction and quantitative real-time PCR, with the highest level found in the anterior intestine, followed by the posterior and middle intestines. The slc34a2 mRNA expression in the whole intestine under different dietary phosphorus (P) treatments was detected using qPCR. The results showed that the slc34a2 expression levels in the low-P groups (0.33 and 0.56 %) were significantly higher (p < 0.05) than levels in the sufficient-P (0.81 %) and high-P (1.15, 1.31, and 1.57 %) groups. High expression of slc34a2 mRNA in low-P groups stimulated P utilization efficiency, indicating the close relationship between genotype and phenotype in yellow catfish. In contrast with conventional strategies (formula and feeding strategies), this study provided another possible approach by using molecular techniques to increase the P utilization in yellow catfish.

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Acknowledgments

This research was funded by the National Natural Science Foundation of China (Project No. 31172421), Special Fund for Agro-scientific Research in the Public Interest (Project No. 201203083), and Fundamental Research Funds for the Central Universities (2013PY076). Thanks were given to Dr. Xiaolei Wang from University of Pittsburgh for his valuable comments on the manuscript.

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Authors and Affiliations

  1. The College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, People’s Republic of China

    Pei Chen, Qin Tang & Chunfang Wang

  2. Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan, 430070, People’s Republic of China

    Pei Chen & Chunfang Wang

  3. Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Wuhan, 430070, People’s Republic of China

    Chunfang Wang

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  1. Pei Chen
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Correspondence to Chunfang Wang.

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Chen, P., Tang, Q. & Wang, C. Characterizing and evaluating the expression of the type IIb sodium-dependent phosphate cotransporter (slc34a2) gene and its potential influence on phosphorus utilization efficiency in yellow catfish (Pelteobagrus fulvidraco). Fish Physiol Biochem 42, 51–64 (2016). https://doi.org/10.1007/s10695-015-0116-z

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