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A novel intron element operates posttranscriptionally To regulate human N-myc expression
L E Sivak1, G Pont-Kingdon, K Le
1Department of Experimental Pathology, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, Utah 84112, USA.
Molecular and Cellular Biology
|December 22, 1998
Summary
The human N-myc gene
Area of Science:
- Molecular Biology
- Cancer Genetics
- Gene Regulation
Background:
- Precise gene expression is crucial for development; dysregulation contributes to cancer.
- The human N-myc gene's expression is tightly controlled, with overexpression linked to neuroblastoma.
- Previous studies showed N-myc reporter constructs behaved differently based on intron inclusion.
Purpose of the Study:
- To investigate the mechanisms underlying tissue-specific regulation of human N-myc gene expression.
- To identify regulatory elements responsible for controlling N-myc expression patterns.
Main Methods:
- Nuclear run-on assays to assess N-myc gene transcription rates.
- Construction and testing of N-myc intron 1 deletion mutants.
- Reporter gene assays using promoter-reporter constructs and heterologous minigenes.
Main Results:
- N-myc is actively transcribed in all cell types, indicating posttranscriptional regulation.
- A 116-bp element within intron 1 (TSE) was identified as crucial for tissue-specific N-myc expression.
- The TSE can independently confer cell-specific expression patterns to reporter genes and functions in both orientations.
Conclusions:
- Human N-myc expression is regulated posttranscriptionally.
- The identified tissue-specific element (TSE) in intron 1 plays a key role in controlling N-myc expression.
- The TSE's dual-orientation function suggests a complex regulatory mechanism.