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Cell type-specific negative regulatory element in low-affinity nerve growth factor receptor gene
T Neuman1, M Metsis, H Persson
1Department of Molecular Cell Biology, Max-Planck-Institute for Biophysical Chemistry, Göttingen FRG.
Brain Research. Molecular Brain Research
|November 1, 1993
Summary
Researchers identified a negative regulatory element (NRE) in the low-affinity nerve growth factor receptor (LNGFR) gene. This element, active in neurons, involves helix-loop-helix transcription factors in gene down-regulation.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Developmental expression patterns of the low-affinity nerve growth factor receptor (LNGFR) gene indicate intricate gene regulation mechanisms.
- Understanding the regulatory elements controlling LNGFR expression is crucial for comprehending neuronal development and function.
Purpose of the Study:
- To identify and characterize regulatory elements involved in the developmental control of the LNGFR gene.
- To elucidate the molecular mechanisms underlying LNGFR gene down-regulation in the nervous system.
Main Methods:
- Localization and characterization of a negative regulatory element (NRE) within the LNGFR gene promoter region.
- Electrophoretic mobility shift assays (EMSA) to analyze protein-DNA interactions at the NRE.
- Functional assays in neuronal and glial cell lines to determine cell-type specific activity of the NRE.
Main Results:
- A 40 bp NRE, located upstream of the LNGFR translation start site, was identified.
- The NRE contains sequences similar to immunoglobulin gene enhancer E-boxes and is active in neurons but not astrocytes.
- EMSA revealed developmental changes in protein binding to the NRE in the nervous system.
- Oligonucleotides with E-box sequences competed for specific protein binding to the NRE.
Conclusions:
- The identified NRE plays a significant role in the negative regulation of LNGFR gene expression.
- The down-regulation of the LNGFR gene in developing neurons likely involves helix-loop-helix transcription factors binding to E-box-like sequences within the NRE.