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p53 tagged sites from human genomic DNA
T Tokino1, S Thiagalingam, W S el-Deiry
1Oncology Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231.
Human Molecular Genetics
|September 1, 1994
Summary
Researchers identified human genomic sequences, called p53-tagged sites (PTS), that activate transcription in a p53-dependent manner. This study refines our understanding of how the tumor suppressor gene p53 functions in the human genome.
Area of Science:
- Molecular Biology
- Genomics
- Cancer Research
Background:
- The tumor suppressor gene p53 plays a crucial role in cellular processes by binding to DNA and regulating gene transcription.
- Its DNA-binding activity is hypothesized to mediate its tumor-suppressive functions, but the full extent of its genomic interactions remains unclear.
Purpose of the Study:
- To identify and characterize human genomic sequences that can be functionally regulated by p53.
- To estimate the total number of such p53-responsive elements in the human genome.
Main Methods:
- Utilized a Saccharomyces cerevisiae-based screening system to identify human genomic sequences.
- These sequences were selected for their ability to activate a reporter gene in a p53-dependent manner, defining them as p53-tagged sites (PTS).
Main Results:
- Identified 57 distinct p53-tagged sites (PTS) from the human genome.
- Predicted the total number of PTS in the human genome to be between 200 and 300.
- Found that most PTS contain two adjacent copies of a specific consensus binding motif (5'-PuPuPuC(A/T)(T/A)GPyPyPy-3') with critical spacing requirements for activation.
Conclusions:
- The study refines the understanding of p53's DNA-binding specificity and its functional genomic targets.
- These findings provide insights into the molecular mechanisms underlying p53-mediated tumor suppression.