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5′‐flanking sequences of the human HPRT gene direct neuronal expression in the brain of transgenic mice

5′‐flanking sequences of the human HPRT gene direct neuronal expression in the brain of... Total deficiency of hypoxanthine phosphoribosyl‐transferase (HPRT) in humans causes the neurological disorder Lesch‐Nyhan syndrome. The HPRT gene is expressed at basal levels in all tissues but at higher levels in the brain, the relevance and mechanism of which is unknown. To determine if cis‐acting DNA elements play a role in the tissue‐differential pattern of expression, we generated transgenic mice carrying different sequences of the human HPRT (hHPRT) promoter fused to the bacterial lacZ gene. We show that a 1.6 kb fragment of the hHPRT promoter contains essential information to direct β‐galactosidase expression preferentially to the basal ganglia, cerebral cortex, hippocampus, and several other areas of the forebrain. At least two elements within the 1.6 kb fragment appear to be required for neuronal expression. A 182 bp element (hHPRT‐NE) represents one of those sequences and is involved not only in confering neuronal specificity but also in repressing transgene expression in non‐neuronal tissues. These studies provide molecular insight into the mechanism of increased HPRT expression in the brain. © 1994 Wiley‐Liss, Inc. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neuroscience Research Wiley

5′‐flanking sequences of the human HPRT gene direct neuronal expression in the brain of transgenic mice

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References (46)

Publisher
Wiley
Copyright
Copyright © 1994 Wiley‐Liss, Inc.
ISSN
0360-4012
eISSN
1097-4547
DOI
10.1002/jnr.490380304
pmid
7523686
Publisher site
See Article on Publisher Site

Abstract

Total deficiency of hypoxanthine phosphoribosyl‐transferase (HPRT) in humans causes the neurological disorder Lesch‐Nyhan syndrome. The HPRT gene is expressed at basal levels in all tissues but at higher levels in the brain, the relevance and mechanism of which is unknown. To determine if cis‐acting DNA elements play a role in the tissue‐differential pattern of expression, we generated transgenic mice carrying different sequences of the human HPRT (hHPRT) promoter fused to the bacterial lacZ gene. We show that a 1.6 kb fragment of the hHPRT promoter contains essential information to direct β‐galactosidase expression preferentially to the basal ganglia, cerebral cortex, hippocampus, and several other areas of the forebrain. At least two elements within the 1.6 kb fragment appear to be required for neuronal expression. A 182 bp element (hHPRT‐NE) represents one of those sequences and is involved not only in confering neuronal specificity but also in repressing transgene expression in non‐neuronal tissues. These studies provide molecular insight into the mechanism of increased HPRT expression in the brain. © 1994 Wiley‐Liss, Inc.

Journal

Journal of Neuroscience ResearchWiley

Published: Jun 15, 1994

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