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The CAG repeat in SCA12 functions as a cis element to up-regulate PPP2R2B expression.
Chih-Hsin Lin1, Chiung-Mei Chen, Yi-Ting Hou
1Department of Life Science, National Taiwan Normal University, 88 Ting-Chou Road, Section 4, Taipei, 11677, Taiwan.
Human Genetics
|June 10, 2010
Summary
Researchers identified key proteins (CREB1, SP1, TFAP4) that regulate PPP2R2B gene expression. This finding offers insights into controlling protein phosphatase 2A (PP2A) activity for treating neurodegenerative diseases.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- PPP2R2B protein regulates protein phosphatase 2A (PP2A) activity, crucial for neuronal function.
- CAG repeat expansion in the PPP2R2B gene is linked to spinocerebellar ataxia type 12.
Purpose of the Study:
- To investigate the regulatory mechanisms controlling PPP2R2B gene expression.
- To identify cis elements and protein factors influencing PPP2R2B expression.
Main Methods:
- Deletion and site-directed mutagenesis.
- In silico analysis and cDNA overexpression.
- DNA pull-down and ChIP-PCR assays.
Main Results:
- CREB1 and SP1 bind upstream of CAG repeats, up-regulating PPP2R2B expression.
- TFAP4 binds downstream of CAG repeats, down-regulating PPP2R2B expression.
- CAG repeats themselves act as a cis element to enhance PPP2R2B expression.
Conclusions:
- CREB1, SP1, and TFAP4 modulate PPP2R2B expression through distinct promoter interactions.
- Understanding these regulatory roles provides a potential mechanism for treating neurodegenerative diseases linked to abnormal PP2A activity.
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