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Master Transcription Regulators

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...

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Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal

Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal

Published on: May 30, 2012

GABPalpha regulates Oct-3/4 expression in mouse embryonic stem cells.

Keita Kinoshita¹, Hiroki Ura, Tadayuki Akagi

¹Department of Stem Cell Biology, Graduate School of Medical Science, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa 920-8640, Japan.

Biochemical and Biophysical Research Communications

|December 30, 2006

Summary

GA-repeat binding protein alpha (GABPalpha) maintains Oct-3/4 expression in embryonic stem cells by downregulating Oct-3/4 repressors. This finding is crucial for understanding stem cell self-renewal.

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Area of Science:

Stem cell biology
Molecular genetics
Transcription factor regulation

Background:

Embryonic stem (ES) cells are pluripotent and essential for development.
Self-renewal of ES cells is regulated by key transcription factors like Oct-3/4, Nanog, Sox2, and STAT3.
Understanding the regulatory network downstream of STAT3 is critical for controlling ES cell fate.

Purpose of the Study:

To identify molecules downstream of STAT3 in embryonic stem cells.
To investigate the role of GA-repeat binding protein alpha (GABPalpha) in ES cell self-renewal and Oct-3/4 expression.

Main Methods:

DNA chip analysis to identify STAT3 downstream molecules.
GABPalpha knockdown and overexpression experiments in ES cells.
Quantitative analysis of Oct-3/4, Cdx-2, Coup-tf1, and GCNF expression levels.

Main Results:

GA-repeat binding protein alpha (GABPalpha) was identified as a STAT3 downstream molecule.
GABPalpha expression is restricted to undifferentiated ES cells and regulated by STAT3.
GABPalpha knockdown reduced Oct-3/4 expression, while GABPalpha overexpression maintained it, even without LIF. GABPalpha knockdown also induced Oct-3/4 repressors (Cdx-2, Coup-tf1, GCNF).

Conclusions:

GABPalpha plays a critical role in maintaining Oct-3/4 expression in ES cells.
GABPalpha upregulates Oct-3/4 by downregulating its repressors, suggesting a novel regulatory mechanism for pluripotency maintenance.