Molecular coupling of Tsix regulation and pluripotency
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Summary
This summary is machine-generated.Pluripotency factors Nanog, Oct4, and Sox2 repress Xist, while Klf4, c-Myc, and Rex1 activate Tsix, coordinating X-chromosome inactivation reprogramming and pluripotency in embryonic stem cells.
Area Of Science
- Epigenetics
- Genetics
- Developmental Biology
Background
- X-chromosome inactivation (XCI) reprogramming is crucial for pluripotency acquisition.
- Xist repression and Tsix upregulation accompany XCI reprogramming.
- Pluripotency factors Nanog, Oct4, and Sox2 repress Xist transcription.
Purpose Of The Study
- To elucidate the relationship between pluripotency transcription factors and Tsix regulation.
- To identify factors involved in Tsix upregulation during embryonic stem cell differentiation.
Main Methods
- Deletion of the DXPas34 minisatellite region.
- Knockdown experiments to assess factor importance.
- Analysis of transcription factor recruitment and transcriptional machinery.
Main Results
- Tsix upregulation in embryonic stem cells requires recruitment of Rex1, Klf4, and c-Myc by the DXPas34 minisatellite.
- DXPas34 deletion abrogates factor binding and impairs Tsix promoter recruitment.
- Rex1 is critical for efficient Tsix transcription elongation.
Conclusions
- Distinct embryonic stem cell-specific complexes link XCI reprogramming and pluripotency.
- Nanog, Oct4, and Sox2 repress Xist, facilitating inactive X reactivation.
- Klf4, c-Myc, and Rex1 activate Tsix, ensuring random X-inactivation upon differentiation.