Related Experiment Videos
[Role of trace elements on metallothionein gene expression]
1Department of Occupational Health and Toxicology, School of Allied Health Science, Kitasato University.
Nihon Rinsho. Japanese Journal of Clinical Medicine
|January 1, 1996
Summary
Metallothionein (MT) proteins protect against metal toxicity and regulate essential elements like zinc and copper. Their gene expression is controlled transcriptionally, influenced by various factors and specific DNA elements.
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Context:
- Metallothioneins (MT) are cysteine-rich, low-molecular-weight proteins.
- MTs play crucial roles in detoxifying heavy metals and managing essential trace elements (e.g., zinc, copper).
- MT expression is inducible by a wide array of stimuli, including metals, hormones, and cytokines.
Purpose:
- To elucidate the regulatory mechanisms governing metallothionein (MT) gene expression.
- To identify key cis-acting elements and trans-acting factors involved in MT gene regulation.
- To understand the role of zinc in modulating MTF-1 activity.
Summary:
- Human MT genes (MT-I, MT-II, MT-III) are located on chromosome 16.
- Gene expression is primarily regulated at the transcriptional level.
- Interactions between cis-acting elements (MRE, GRE, IRE) and trans-acting factors (MTF-1, ZRF, MRE-BF-1/2, MREBP) control MT expression.
- Metal-induced regulation involves MTF-1 binding to MREs, with zinc releasing MTF-1 from its inhibitor.
Impact:
- Provides a detailed understanding of metallothionein gene regulation.
- Highlights the intricate interplay between DNA elements and transcription factors.
- Offers insights into the molecular basis of metal homeostasis and toxicity response.