Pluripotency factors functionally premark cell-type-restricted enhancers in ES cells

Area of Science:

• Developmental Biology
• Epigenetics
• Gene Regulation

Background:

• Enhancers for embryonic stem (ES) cell genes have typical activation marks.
• It's unclear if enhancers for cell-type-specific genes have distinct signatures in ES cells.

Purpose of the Study:

• Investigate distinct signatures of cell-type-restricted enhancers in ES cells.
• Determine the role of these signatures in future enhancer activity.

Main Methods:

• Experimental validation in ES cell-derived macrophages and neural precursor cells (NPCs).
• Utilized edited cells with specific ES cell transcription factor motif deletions.
• Assessed DNA hydroxyl-methylation as a molecular memory marker.

Main Results:

• Cell-type-restricted enhancers are premarked by ES cell transcription factors, lacking traditional marks.
• This premarking is essential for subsequent cell-type-restricted enhancer activity.
• The strength of the ES cell signature influences the robustness of enhancer activation.

Conclusions:

• Cell-type-restricted enhancers are hierarchically premarked by ES cell transcription factors.
• This premarking dictates the robustness of enhancer activation in mature differentiated cells.
• DNA hydroxyl-methylation may act as molecular memory for enhancer activation.