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Multiple transcripts for rat nucleoside diphosphate kinase alpha isoform are structurally categorized into two groups
N Ishikawa1, H Taniguchi-Seto, Y Munakata
1Department of Molecular Pathology, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakaecho, Itabashi-ku, Tokyo 173, Japan. naoshi@center.tmig.or.jp
The Journal of Biological Chemistry
|February 7, 1997
Summary
Rat nucleoside diphosphate (NDP) kinase gene expression is regulated by transcription initiation site selection. This impacts mRNA levels and translation efficiency, influencing cellular processes like growth and metastasis.
Area of Science:
- Molecular Biology
- Gene Regulation
- Biochemistry
Background:
- Rat nucleoside diphosphate (NDP) kinase exists as alpha and beta isoforms, with ubiquitous but tissue-specific mRNA expression.
- Expression levels are modulated by growth stimulation, differentiation, and tumor metastasis, indicating complex regulatory mechanisms.
Purpose of the Study:
- To investigate the regulatory mechanisms governing rat NDP kinase alpha gene expression.
- To identify transcription initiation sites and the core promoter region of the rat NDP kinase alpha gene.
Main Methods:
- RNase protection assays to identify transcription initiation sites.
- 5'-rapid amplification of DNA ends (5'-RACE) for transcript analysis.
- Chloramphenicol acetyltransferase (CAT) assays to locate the core promoter region.
- In situ hybridization for cell-specific mRNA localization.
Main Results:
- Identified a wide range of transcription initiation sites, categorized into two groups based on upstream (group 1) or downstream (group 2) initiation.
- Group 1 mRNA was dominant in most tissues, except heart and skeletal muscle.
- Cell-specific expression patterns were observed for both mRNA species.
- Differential translational efficiencies were found: group 2 alpha > beta > group 1 alpha.
Conclusions:
- The selection of transcription initiation sites plays a fundamental role in regulating NDP kinase expression.
- Both transcriptional and posttranscriptional regulatory steps are influenced by initiation site choice.
- This regulation impacts NDP kinase function in various cellular contexts, including development and disease.