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Assessment of Selective mRNA Translation in Mammalian Cells by Polysome Profiling
Published on: October 28, 2014
p53 and translational control
1Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115, USA.
Abstract:
The tumor suppressor p53 plays a role in mediating a G1 arrest (for example, in response to DNA damage), in the cellular commitment to apoptosis and in suppression of transformation. The mechanism of action of p53 in each of these biological outcomes is likely to be overlapping. Current data indicate that p53 functions as a sequence specific transcriptional activator. p53 can also repress transcription from certain promoters. One way in which p53 mediates a G1 arrest after DNA damage appears to be clear. Cells exposed to ionizing radiation show elevated levels of p53 protein. The increase in p53 levels is thought to be responsible for the increase in the cyclin-dependent kinase (cdk) inhibitor p21 mediated through the p53 binding sites in the p21 promoter. With regard to the ability of p53 to suppress transformation, there is data suggesting that p53 functions other than, or in addition to, its transcriptional activation function may be necessary. Similar data exist for p53-dependent apoptosis. Recently a role for p53 at another level of gene regulation, namely, translational regulation has been proposed. p53 associates with various components of the translation machinery and has been implicated in the translational regulation of both the p53 and CDK4 mRNAs. Here we will summarize the evidence suggesting a role for p53 in translation and how this regulation might be achieved.
Insights
The tumor suppressor p53 protein regulates cell cycle arrest and apoptosis. Recent findings suggest p53 also controls gene expression at the translational level, impacting mRNA translation.
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Research
Background:
- The tumor suppressor p53 protein is crucial for cell cycle arrest, apoptosis, and suppressing cellular transformation.
- p53 primarily functions as a sequence-specific transcriptional activator but can also repress transcription.
- Elevated p53 levels after DNA damage induce the cyclin-dependent kinase inhibitor p21, mediating G1 arrest.
Purpose of the Study:
- To summarize evidence supporting a role for p53 in translational regulation.
- To explore the mechanisms by which p53 might regulate translation.
- To discuss the implications of p53's translational control in biological outcomes.
Main Methods:
- Review of existing literature on p53 function.
- Analysis of studies investigating p53 interactions with the translation machinery.
- Examination of data on p53's role in regulating specific mRNA translation.
Main Results:
- p53 has been shown to associate with components of the translation machinery.
- Evidence suggests p53 influences the translation of its own mRNA and CDK4 mRNA.
- These findings propose a novel layer of gene regulation by p53 beyond transcriptional control.
Conclusions:
- p53's function extends to translational regulation, adding another mechanism to its tumor suppressor activities.
- Understanding p53's role in translation may reveal new therapeutic targets for cancer.
- Further research is needed to fully elucidate the mechanisms and biological significance of p53-mediated translational control.
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