Isolation of human aquaporin 3 gene.

The Journal of Biological Chemistry
N InaseF Marumo

Abstract

Human aquaporin 3 (AQP3) gene was isolated, and its structural organization was characterized. The gene appeared to exist as a single copy in the human genome and to comprise six exons distributing over 7 kilobases. The sizes of the exons are 171, 127, 138, 119, 218, and 1035 base pairs, and those of introns are approximately 3530, 300, 350, 330, and 90 base pairs, respectively. The initiation site of transcription was identified to locate 64 base pairs upstream of the first ATG codon by primer extension analysis and ribonuclease protection assay. The 5'-flanking region has a TATA box, two Sp1 sequences, and some consensus sequences including AP2 sites. With luciferase assay, the 5'-flanking region was demonstrated to have a promoter activity, which is up-regulated 4-fold by phorbol ester. These findings about the genomic clone of human AQP3 will contribute to elucidate the molecular mechanism of transcriptional regulation of AQP3.

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