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The human microsomal epoxide hydrolase gene (EPHX1): complete nucleotide sequence and structural characterization
C Hassett1, K B Robinson, N B Beck
1Department of Environmental Health, School of Public Health and Community Medicine, University of Washington, Seattle 98195.
Genomics
|September 15, 1994
Summary
Researchers sequenced the human microsomal epoxide hydrolase (mEH) gene (EPHX1), revealing its structure and promoter activity. Findings indicate a weak core promoter with negative regulation from upstream sequences.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Human microsomal epoxide hydrolase (mEH) is crucial for detoxifying epoxides.
- Understanding the EPHX1 gene structure and regulation is vital for xenobiotic metabolism research.
Purpose of the Study:
- To isolate and sequence the complete human mEH gene (EPHX1).
- To characterize the gene's structure, including exons, introns, and flanking regions.
- To investigate the regulatory elements of the human mEH promoter.
Main Methods:
- Gene isolation and sequencing of the entire human mEH (EPHX1).
- Analysis of gene structure: 9 exons, 8 introns, and flanking sequences.
- Construction and transfection of chimeric plasmids with a CAT reporter gene to assess promoter activity.
Main Results:
- The primary nuclear transcript is 20,271 nucleotides long.
- The gene structure includes 9 exons and 8 introns, with repetitive elements like Alu sequences.
- Promoter analysis suggests a weak core promoter, with negative regulation by upstream sequences.
Conclusions:
- The human mEH gene (EPHX1) has been fully sequenced and characterized.
- The promoter region exhibits weak activity and is subject to negative regulation.
- These findings provide insights into the transcriptional control of xenobiotic metabolism.