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Author

Kwon, H. Moo
Inflammation and Kidney Disorder Lab
Research Interests
  • TonEBP, Obesity, Cancer, Chronic inflammatory diseases, Brain disorder, Kidney disorders, Genomic instability

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The canine sodium/myo-inositol cotransporter gene: Structural organization and characterization of the promoter

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Title
The canine sodium/myo-inositol cotransporter gene: Structural organization and characterization of the promoter
Author
Rim, JSTanawattanacharoen, STakenaka, MHandler, JSKwon, H. Moo
Keywords
sodium/myo-inositol cotransporter; promoter; osmolyte
Issue Date
199705
Publisher
ELSEVIER SCIENCE INC
Citation
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS, v.341, no.1, pp.193 - 199
Abstract
The sodium/myo-inositol cotransporter (SMIT) is a plasma membrane protein catalyzing transfer of myoinositol into cells against a considerable concentration gradient using the electrochemical potential of sodium across the cell membrane, Transcription of the SMIT gene is markedly stimulated when cells are exposed to a hypertonic environment resulting in increased abundance of SMIT mRNA and increased SMIT activity, The increased accumulation of myo-inositol protects cells from the deleterious effects of hypertonicity, In an effort toward understanding transcriptional regulation, we cloned canine genomic DNA fragments containing the SMIT gene. The gene is 37 kb in size consisting of 2 exons and a large intron of 25 kb, The entire open reading frame is in the second exon, The promoter of the gene is highly active due to a GC-rich sequence. Ribonuclease protection assay using a riboprobe complementary to the 5' end of the gene confirmed that the promoter of the gene is stimulated by hypertonicity, The promoters and regulatory sequences of the SMIT gene and the betaine transporter gene, another gene regulated by hypertonicity, appear to be different.
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DOI
http://dx.doi.org/10.1006/abbi.1997.9950
ISSN
0003-9861
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