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Cloning and molecular characterization of cationic amino acid transporter y+LAT1 in grass carp (Ctenopharyngodon idellus)

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Abstract

The solute carrier family 7A, member 7 gene encodes the light chain- y+L amino acid transporter-1 (y+LAT1) of the heterodimeric carrier responsible for cationic amino acid (CAA) transport across the basolateral membranes of epithelial cells in intestine and kidney. Rising attention has been given to y+LAT1 involved in CAA metabolic pathways and growth control. The molecular characterization and function analysis of y+LAT1 in grass carp (Ctenopharyngodon idellus) is currently unknown. In the present study, full-length cDNA (2,688 bp), which encodes y+LAT1 and contains a 5′-untranslated region (319 bp), an open reading frame (1,506 bp) and a 3′-untranslated region (863 bp), has been cloned from grass carp. Amino acid sequence of grass carp y+LAT1 contains 11 transmembrane domains and shows 95 %, 80 % and 75 % sequence similarity to zebra fish, amphibian and mammalian y+LAT1, respectively. The tissue distribution and expression regulation by fasting of y+LAT1 mRNA were analyzed using real-time PCR. Our results showed that y+LAT1 mRNA was highly expressed in midgut, foregut and spleen while weakly expressed in hindgut, kidney, gill, brain, heart, liver and muscle. Nutritional status significantly influenced y+LAT1 mRNA expression in fish tissues, such as down-regulation of y+LAT1 mRNA expression after fasting (14 days).

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Acknowledgments

We were grateful to Dr. Shan He (Huazhong Agricultural University, China) for her helpful review of the manuscript. This research was supported by Huazhong Agricultural University Scientific & Technological Self-innovation Foundation (Project No. 2009QC022).

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Correspondence to Qingsong Tan or Lei Pan.

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Yang, J., Tan, Q., Zhu, W. et al. Cloning and molecular characterization of cationic amino acid transporter y+LAT1 in grass carp (Ctenopharyngodon idellus). Fish Physiol Biochem 40, 93–104 (2014). https://doi.org/10.1007/s10695-013-9827-1

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