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Published on: July 25, 2017
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Tumorigenesis promotes Mdm4-S overexpression.
Vinod Pant1, Connie A Larsson1, Neeraj Aryal1
1Department of Genetics, M.D. Anderson Cancer Center, Houston, Texas, 77030, USA.
Oncotarget
|May 3, 2017
Summary
The splice variant MDM4-S does not cause cancer or worsen tumor progression. MDM4-S overexpression is a result of splicing defects in tumor cells, not a driver of tumor evolution.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Disruption of the p53 tumor suppressor pathway drives tumorigenesis.
- Overexpression of MDM2 and MDM4, negative regulators of p53, contributes to tumor development.
- Splice variants of Mdm2 and Mdm4, including MDM4-S, are implicated in tumor progression.
Purpose of the Study:
- To investigate the role of the MDM4-S splice variant in tumor development.
- To determine if MDM4-S expression is oncogenic or a consequence of tumorigenesis.
- To assess the impact of MDM4-S on tumor latency and aggressiveness in a mouse model.
Main Methods:
- Utilized a transgenic mouse model to study Mdm4-S function.
- Examined the effect of Mdm4-S on tumor development and progression.
- Assessed cooperation with other oncogenic factors.
Main Results:
- Splicing of Mdm4 did not promote tumor development in the mouse model.
- MDM4-S did not alter tumor latency or aggressiveness when cooperating with other oncogenic insults.
- MDM4-S overexpression was observed as a consequence of splicing defects.
Conclusions:
- MDM4-S is not an oncogenic driver of tumor development.
- Overexpression of MDM4-S is a result of splicing defects, not a cause of tumor evolution.
- MDM4-S is a consequence, not a cause, of tumorigenesis.
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