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Updated: Aug 11, 2026
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Heterokaryon Technique for Analysis of Cell Type-specific Localization
Published on: March 11, 2011
Structure and chromosomal localization of the functional intronless human JUN protooncogene
K Hattori1, P Angel, M M Le Beau
1Department of Pharmacology, School of Medicine, University of California, San Diego, La Jolla 92093.
Summary
The human JUN gene, encoding the transcription factor AP-1 (activator protein 1), was found to be intronless. This gene
Area of Science:
- Molecular Biology
- Genetics
- Oncology
Background:
- The JUN protooncogene encodes the transcription factor AP-1 (activator protein 1), crucial for cellular regulation.
- Understanding the structure and regulation of JUN is vital for comprehending its role in cellular processes and disease.
Purpose of the Study:
- To elucidate the genomic structure and transcription pattern of the human JUN gene.
- To investigate the functional activity of the cloned JUN gene.
- To map the chromosomal location of JUN and assess its potential role in neuroblastoma pathogenesis.
Main Methods:
- Isolation and sequencing of a human JUN genomic clone.
- RNase protection assays to determine transcript heterogeneity.
- Transfection experiments to assess gene function.
- In situ hybridization to map JUN to a specific chromosomal region.
Main Results:
- The human JUN gene lacks introns, with its genomic sequence contiguous to its cDNA.
- JUN produces multiple transcripts due to 5' and 3' heterogeneity.
- The cloned JUN gene is functional, encoding a trans-acting factor that activates AP-1-dependent transcription.
- JUN was mapped to chromosomal region 1p31-32, a region frequently deleted in neuroblastomas.
Conclusions:
- The human JUN gene is an intronless gene with complex transcriptional regulation.
- The identification of JUN at 1p31-32 suggests its potential role in neuroblastoma development due to frequent deletions in this region.
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