Highly interconnected enhancer communities control lineage-determining genes in human mesenchymal stem cells

Area of Science:

• Genomics
• Molecular Biology
• Cell Biology

Background:

• Adipocyte differentiation involves transcriptional regulators that alter enhancer and promoter interactions.
• Understanding the dynamic nature of these interactions is crucial for deciphering gene regulation during cell fate decisions.

Purpose of the Study:

• To investigate the role of enhancer-to-enhancer interactions during human mesenchymal stem cell differentiation.
• To characterize the network dynamics and functional significance of enhancers in 3D genome organization.

Main Methods:

• Utilized high-throughput chromosome conformation enhancer capture (3C-EC) technology.
• Analyzed dynamic changes in enhancer networks and transcription factor (TF) binding during differentiation.

Main Results:

• Identified dynamic enhancer networks that change in activity during adipocyte differentiation.
• Discovered 'cross-interaction stabilization of TFs,' where TFs at one enhancer amplify binding at another.
• Characterized highly interconnected enhancers (HICE) as integration hubs forming 3D enhancer communities that converge on gene promoters.

Conclusions:

• Enhancer interactions are critical for regulating enhancer function and orchestrating cell differentiation.
• HICE play a key role in integrating cellular signals and compartmentalizing the genome for efficient gene regulation.