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Genomic structure and polymorphism of the human thromboxane synthase-encoding gene
1Department of Obstetrics and Gynecology, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
Gene
|September 16, 1996
Summary
This study characterizes the human thromboxane synthase (hTS) gene, revealing its 13-exon structure and TATA-independent promoter. A polymorphic CA repeat in intron 9 shows allelic variation, important for understanding hTS gene regulation.
Area of Science:
- Biochemistry
- Genetics
- Molecular Biology
Background:
- Thromboxane synthase (TS) is a cytochrome P-450 enzyme crucial for hemostasis and cardiovascular health.
- TS catalyzes the conversion of prostaglandin endoperoxide (PGH2) to thromboxane A2 (TxA2).
Purpose of the Study:
- To isolate and characterize the genomic structure of the human TS (hTS) gene.
- To investigate the transcriptional regulation and identify genetic polymorphisms within the hTS gene.
Main Methods:
- Isolation and characterization of twelve genomic clones encoding the human TS gene.
- Southern analysis to determine gene copy number.
- Reporter gene expression assays in transfected cells to analyze promoter activity.
- PCR amplification and sequencing to detect polymorphisms in intronic regions.
Main Results:
- The hTS gene comprises 13 exons spanning over 150 kb, with initial exons separated by large introns.
- Southern analysis confirmed a single hTS gene copy per haploid genome.
- Reporter gene assays indicated TATA-independent transcription initiation.
- A polymorphic dinucleotide (CA) repeat in the ninth intron was identified, with at least four alleles detected.
Conclusions:
- The genomic organization of the hTS gene has been elucidated.
- The TATA-independent promoter suggests complex transcriptional regulation mechanisms.
- The identified intronic polymorphism offers a potential marker for population genetics studies and disease association.