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A gene encoding rat cholecystokinin. Isolation, nucleotide sequence, and promoter activity
The Journal of Biological Chemistry
|January 25, 1985
Summary
Researchers isolated the rat cholecystokinin (CCK) gene, revealing its 7-kilobase structure with introns and noncoding exon 1. Promoter analysis identified a key regulatory region essential for gene expression.
Area of Science:
- Molecular Biology
- Genetics
- Neuroendocrinology
Background:
- Cholecystokinin (CCK) is a crucial neuropeptide involved in various physiological processes.
- Understanding the genetic regulation of CCK is vital for comprehending its role in health and disease.
Purpose of the Study:
- To isolate and characterize the rat cholecystokinin (CCK) gene.
- To identify regulatory elements controlling CCK gene transcription and expression.
Main Methods:
- Genomic DNA library screening for CCK gene isolation.
- Northern blot analysis and primer extension for transcription initiation site mapping.
- Nuclease protection assays for polyadenylation site determination.
- Reporter gene assays (chloramphenicol acetyltransferase) to identify promoter activity.
Main Results:
- The rat CCK gene spans 7 kilobases, featuring two introns and a noncoding exon 1.
- Transcription initiation and polyadenylation sites were precisely mapped.
- A TATA-like sequence was identified upstream of the transcription start site.
- Repetitive DNA elements were found within intron 2 and downstream of the gene.
- A 144-base pair region upstream of the transcription initiation site was identified as crucial for promoter activity.
Conclusions:
- The study provides a comprehensive characterization of the rat CCK gene structure and regulatory regions.
- Identified promoter elements are essential for CCK gene expression, offering insights into neuropeptide regulation.