Is. Wood et al., Isolation and characterization of a genomic region upstream from the ovineNa+/D-glucose cotransporter (SGLT1) cDNA, BIOC BIOP R, 257(2), 1999, pp. 533-537
Citations number
24
Categorie Soggetti
Biochemistry & Biophysics
Journal title
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
D-Glucose and non-metabolisable analogues of D-glucose regulate the express
ion of intestinal SGLT1 at both transcriptional and post-transcriptional le
vels. In order to investigate the molecular mechanisms involved in the tran
scriptional regulation of the ovine intestinal SGLT1 gene, we have isolated
an upstream element of about 1 gb in size. This DNA fragment contains a TA
TA box motif, 48 bp upstream of the transcriptional start site and includes
transcription factor binding sites for HNF-1 and AP-2. We have shown that
the ovine SGLT1 promoter fragment can drive the transcription of a reporter
gene when transfected into the epithelial cell lines STC-1 and LLC-PK1, wh
ich endogenously express SGLT1. Deletion analyses of the promoter indicate
that -66/+21 bp proximal sequence directs the highest level of reporter gen
e activity. There are one and possibly two sites of transcriptional suppres
sion. (C) 1999 Academic Press.