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Characterization of the human gene (TBXAS1) encoding thromboxane synthase
A Miyata1, C Yokoyama, H Ihara
1Department of Pharmacology, National Cardiovascular Center Research Institute, Osaka, Japan.
European Journal of Biochemistry
|September 1, 1994
Summary
The human thromboxane synthase (TBXAS1) gene structure was elucidated, revealing its chromosomal location and widespread tissue expression. This research provides foundational insights into TBXAS1 gene regulation and function.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Thromboxane synthase (TBXAS1) plays a critical role in hemostasis and thrombosis.
- Understanding the genetic basis of TBXAS1 is essential for investigating related physiological and pathological processes.
Purpose of the Study:
- To isolate and characterize the human thromboxane synthase (TBXAS1) gene.
- To determine the gene's structure, chromosomal localization, and expression patterns.
Main Methods:
- Isolation of the TBXAS1 gene from a human genomic library using cDNA probes.
- Nucleotide sequencing, Southern-blot analysis, and fluorescence in situ hybridization (FISH).
- Primer-extension analysis for transcription start sites and tissue distribution studies of mRNA.
Main Results:
- The human TBXAS1 gene spans over 75 kb, comprising 13 exons and 12 introns.
- The gene is located on chromosome 7q33-q34 and exists as a single copy per haploid genome.
- Multiple transcription start sites were identified, with widespread mRNA expression in various human tissues, notably abundant in leukocytes, spleen, lung, and liver.
Conclusions:
- The detailed characterization of the TBXAS1 gene provides a foundation for understanding its regulation.
- The identified regulatory elements in the 5'-flanking region suggest complex transcriptional control.
- Widespread tissue expression indicates diverse roles for thromboxane synthase beyond platelet aggregation.