[No authors listed]
As one subgroup of aquaporin, aquaglyceroporin including AQP3, 7, 9, 10 facilitates glycerol transport as well as water transport. In this study, we cloned the full length coding sequences of porcine (Sus scrofa) AQP3, 7 and 9 and the genomic sequence of AQP3 including 6 exons and 5 introns. Additionally, as a first step toward understanding the regulatory mechanisms of AQP9 in pig, we cloned and analyzed the upstream genomic sequence of the ATG translation initiation codon and found two negative insulin response elements (TGTTTTC and TATTTTG.), glucocorticoid-responsive elements, several CCAAT enhancer binding protein (C/EBP) sites, hepatocyte nuclear factor (HNF) sites, and NF-kappaB sites in this region. Subsequently, semi-quantitative analysis showed that AQP3 selectively expressed in spleen, stomach, kidney and lung. AQP7 and AQP9 were ubiquitously detected in all tissues examined and highly expressed in adipose tissue and liver, respectively. Finally, both AQP3 and AQP7 were assigned to chromosome 10q while AQP9 was mapped to chromosome 1q. This is the first report of molecular characterization of aquaglyceroporin in pig, which provides basic observations useful for future assessing and characterizing the role of aquaglyceroporin.
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