Single-cell 3D genome imaging shows super-enhancer hubs are rare, nonspecific, and neither necessary nor sufficient for transcriptional bursting.

Single-cell 3D genome imaging reveals that super-enhancer hubs are rare, nonspecific, and not essential for transcriptional bursting in mouse embryonic stem cells.

• Why it matters: Understanding the role of super-enhancer hubs in gene regulation is crucial because they have been proposed as key organizers of transcriptional activity, yet their actual prevalence and function remain unclear.
• What they did: Using multiplexed imaging of hundreds of SEs in thousands of cells, combined with transcription measurements, the study mapped spatial SE organization and assessed its relationship to transcriptional bursting, including perturbations of key genome organizers.
• The result: Findings show most SEs are isolated, with rare, promiscuous hubs that are not necessary or sufficient for bursting, although larger hubs slightly increase burst probability, challenging models of SE hubs as primary enhancer mechanisms.