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Tissue-specific regulatory elements in the human alcohol dehydrogenase 6 gene
X Zhi1, E M Chan, H J Edenberg
1Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis 46202-5122, USA.
DNA and Cell Biology
|September 7, 2000
Summary
Regulatory elements control human alcohol dehydrogenase gene ADH6 expression. Specific DNA regions, including the TATA box and upstream elements, influence ADH6 transcription in a tissue-specific manner, particularly in liver cells.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- The human alcohol dehydrogenase gene ADH6 shows highest expression in fetal and adult liver.
- Understanding the regulatory mechanisms of ADH6 is crucial for comprehending its role in liver function.
Purpose of the Study:
- To map cis-acting elements that regulate the expression of the human alcohol dehydrogenase gene ADH6.
- To investigate the role of specific DNA sequences and protein interactions in ADH6 tissue-specific expression.
Main Methods:
- Deletion analysis of the ADH6 gene promoter region.
- Nuclear protein binding assays (e.g., using liver, hepatoma cells, and fibroblasts).
- Reporter gene assays to assess transcriptional activity.
Main Results:
- A proximal region containing the TATA box (site C) is essential for ADH6 transcription and binds nuclear proteins.
- While C/EBP transcription factors bind to site C, they do not stimulate ADH6 transcription.
- An upstream region (-1.6 to -2.3 kb) contains distinct regulatory elements: Site 1 acts as a negative regulator in fibroblasts, and Site 2 acts as a positive regulator in hepatoma cells.
Conclusions:
- The TATA box region and upstream elements are critical for ADH6 gene regulation.
- A combination of positive and negative regulatory elements contributes to the tissue-specific expression of ADH6, particularly in liver and hepatoma cells versus fibroblasts.