| Literature DB >> 9745437 |
K Y Ryu1, Q Tong, S M Jhiang.
Abstract
The Na+/I- symporter (NIS) is the plasma membrane protein that mediates active iodide uptake into thyroid follicular cells. To understand the molecular mechanisms of human NIS (hNIS) gene regulation, the 2-kb immediate 5'-flanking region of hNIS was characterized. The tentative hNIS transcriptional start site was mapped to -375 nucleotide relative to the ATG site. Various 5'-genomic DNA fragments were tested for promoter activity in thyroid and nonthyroid cells. Our results indicate that the DNA regulatory elements in the 2-kb immediate 5'-flanking region were not sufficient to confer thyroid-selective transcription of the hNIS gene. In addition, hNIS minimal promoter was localized to a region of 144 bp that contains a 90-bp stretch of a highly conserved DNA fragment between hNIS and rat NIS.Entities:
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Year: 1998 PMID： 9745437 DOI： 10.1210/jcem.83.9.5118
Source DB: PubMed Journal: J Clin Endocrinol Metab ISSN： 0021-972X Impact factor: 5.958