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Analysis of recombinant DNA clones specific for the murine p53 cellular tumor antigen
Abstract:
Three cDNA clones, corresponding to two non-overlapping regions of the mRNA coding for the mouse p53 cellular tumor antigen, were isolated and characterized. In hybridization-selection assays, these clones were capable of selectively binding p53 mRNA, as demonstrated by in vitro translation and immunoprecipitation with anti-p53 monoclonal antibodies. The p53 mRNA appeared to be the only messenger species specifically selected by these clones. The size of the p53 mRNA was found to be approximately 2 kb, and its levels to vary substantially among different types of transformed cells. Evidence was found for the existence of two distinct p53-specific genes in mouse genomic DNA. Two partially overlapping recombinant phage clones were obtained, both derived from the same p53-specific genomic DNA region. The orientation of the various cDNA clones relative to that of the p53 mRNA was established by S1 analysis and the relationship between the cDNA clones and the genomic ones was determined by comparative restriction enzyme mapping and nucleic acid hybridization.
Insights
Researchers isolated mouse p53 cellular tumor antigen cDNA clones, identifying p53 mRNA and its distinct genomic genes. This study characterizes the p53 gene and its mRNA expression in transformed cells.
Area of Science:
- Molecular Biology
- Cancer Research
- Genetics
Background:
- The p53 cellular tumor antigen is a critical protein involved in cell cycle regulation and tumor suppression.
- Understanding the genetic basis and mRNA expression of p53 is crucial for cancer research.
Purpose of the Study:
- To isolate and characterize cDNA clones of the mouse p53 cellular tumor antigen.
- To investigate the p53 mRNA and its gene structure in mouse genomic DNA.
- To analyze the expression levels of p53 mRNA in different transformed cell types.
Main Methods:
- Isolation and characterization of three cDNA clones specific to mouse p53 mRNA.
- Hybridization-selection assays using in vitro translation and immunoprecipitation.
- Analysis of mouse genomic DNA for p53-specific genes using recombinant phage clones.
- S1 analysis, restriction enzyme mapping, and nucleic acid hybridization to determine clone orientation and relationships.
Main Results:
- Successfully isolated and characterized cDNA clones that selectively bind mouse p53 mRNA.
- Determined the approximate size of p53 mRNA to be 2 kb.
- Observed substantial variation in p53 mRNA levels across different transformed cell types.
- Identified evidence for two distinct p53-specific genes in mouse genomic DNA.
Conclusions:
- The isolated cDNA clones are effective tools for studying mouse p53 mRNA.
- Mouse p53 mRNA exhibits variable expression in transformed cells, suggesting regulatory mechanisms.
- The presence of distinct p53 genes indicates a complex genetic organization for this important tumor suppressor.