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A polymorphic microsatellite that mediates induction of PIG3 by p53
Ana Contente1, Alexandra Dittmer, Manuela C Koch
1Institut für Virologie, Abteilung Gastroenterologie und Stoffwechsel, Klinikum der Philipps-Universität Marburg, Germany.
Nature Genetics
|March 29, 2002
Summary
The tumor suppressor p53 directly activates the PIG3 gene promoter via a novel polymorphic microsatellite. This interaction, influenced by repeat number, may impact cancer susceptibility.
Area of Science:
- Molecular Biology
- Genetics
- Cancer Research
Background:
- The tumor suppressor p53 is a key regulator of cell death.
- PIG3 gene induction by p53 suggests a role in apoptosis.
- Previous p53-binding elements did not fully explain PIG3 regulation.
Purpose of the Study:
- To elucidate the mechanism of p53-mediated PIG3 gene induction.
- To identify the specific DNA element responsible for p53 binding to the PIG3 promoter.
- To investigate the functional and population-level significance of this interaction.
Main Methods:
- Analysis of p53-PIG3 promoter interaction using in vitro and in vivo methods.
- Identification and characterization of a novel microsatellite element in the PIG3 promoter.
- Genotyping of the microsatellite in a healthy German population.
Main Results:
- p53 directly binds and activates the PIG3 promoter through a (TGYCC)n microsatellite, not previously described elements.
- This microsatellite is necessary and sufficient for p53-dependent PIG3 transcriptional activation.
- The microsatellite is polymorphic in the population, with varying repeat numbers correlating with transcriptional activity.
Conclusions:
- This study reveals a novel mechanism where a polymorphic microsatellite mediates transcription factor binding and gene induction.
- The PIG3 microsatellite is the first identified polymorphic p53-responsive element.
- Variations in this microsatellite may influence individual susceptibility to cancer.