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This study utilized multiplexed chromatin tracing to investigate the role of 3D genome architecture in transcriptional specificity within the adult Drosophila brain at single-cell resolution. The researchers discovered that while increased enhancer-promoter (E-P) proximity correlates with transcriptionally active neurons, this relationship does not extend to predicting transcriptional output across different active neuronal subtypes. The findings suggest that E-P proximity serves as a structural indicator of transcriptional competence, but additional regulatory mechanisms are necessary to fine-tune actual transcriptional levels.
Enhancer-promoter proximity signals transcriptional competence but fails to predict actual gene expression levels across neuronal subtypes.
How 3D genome architecture contributes to transcriptional specificity across neuronal cell types remains unclear. Here, we used multiplexed chromatin tracing to map chromatin architecture and cell identity at single-cell resolution in the adult Drosophila brain. We found that enhancer-promoter (E-P) proximity was increased in transcriptionally active compared with inactive neurons. Analysis of single traces revealed the existence of distinct proximal and distal E-P states, with active neurons enriched in the proximal state. However, this relationship broke down across active neuronal subtypes, where neither E-P proximity nor chromatin accessibility predicted transcriptional output. Thus, 3D genome organization distinguishes transcriptionally competent from inactive neuronal states without quantitatively specifying transcriptional output. Our findings support a model in which E-P proximity establishes a permissive structural state, while additional cell-type-specific regulatory mechanisms tune transcriptional output.