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Extinction of alpha-fetoprotein gene expression in somatic cell hybrids involves cis-acting DNA elements
Molecular and Cellular Biology
|July 1, 1987
Summary
Mouse alpha-Fetoprotein (AFP) gene expression is silenced in hybrid cells. This silencing involves regulatory elements like enhancers and promoters in the AFP gene's 5' region.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Alpha-Fetoprotein (AFP) is a liver-specific protein.
- Somatic cell hybrids are formed by fusing different cell types.
Purpose of the Study:
- To investigate the mechanisms behind the extinction of mouse AFP expression in somatic cell hybrids.
- To identify regulatory regions involved in AFP gene silencing.
Main Methods:
- Fusion of mouse hepatoma cells (BWTG3) with rat fibroblast cells (JF1) to create somatic cell hybrids.
- Analysis of AFP gene expression in the resulting hybrid cells.
Main Results:
- Mouse AFP expression was extinguished in the somatic cell hybrids.
- Evidence suggests the involvement of at least two cis-acting regulatory domains in the 5'-flanking region of the AFP gene.
- These domains include enhancer elements and a tissue-specific promoter region.
Conclusions:
- The extinction of mouse AFP expression in somatic cell hybrids is regulated by specific cis-acting elements.
- Enhancers and tissue-specific promoters within the AFP gene's 5'-flanking region play a crucial role in gene silencing.