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p53 activates Fanconi anemia group C gene expression
W Liebetrau1, A Budde, A Savoia
1Department of Human Genetics, University of Wuerzburg, Germany.
Human Molecular Genetics
|February 1, 1997
Summary
The tumor suppressor protein p53 (wtp53) activates Fanconi anemia complementation group C (FAC) gene transcription. Overexpression of wtp53 significantly increases FAC gene expression, demonstrating a novel interaction.
Area of Science:
- Molecular Biology
- Cancer Research
- Genetics
Background:
- The tumor suppressor protein p53 (wtp53) is a transcription factor that regulates gene expression.
- Fanconi anemia complementation group C (FAC) is involved in DNA repair and genome stability.
Purpose of the Study:
- To investigate the interaction between p53 and the FAC gene.
- To determine if p53 binding sites in the FAC gene influence its transcription.
Main Methods:
- Gel shift assays to confirm p53 binding to the FAC promoter.
- Transfection experiments in human diploid fibroblasts and lymphoblasts to assess FAC gene expression.
- Luciferase assays to evaluate promoter activity.
Main Results:
- Wild-type p53 binds to the p53 target sequence in the FAC promoter.
- Overexpression of wtp53 increased FAC gene transcription up to threefold.
- p53 mutants deficient in DNA binding showed reduced stimulatory activity on FAC transcription.
- p53 interaction with the FAC promoter did not modulate promoter activity.
Conclusions:
- The FAC gene is a novel target gene regulated by p53.
- p53 binding sites contribute to, but are not essential for, p53-mediated transcriptional activation of FAC.
- p53 plays a role in regulating genes involved in DNA repair and maintaining genome integrity.