Self-organization of Drosophila chromatin architecture in a cell-free system.

In cell-free extracts from syncytial Drosophila melanogaster embryos, long-range chromatin contacts, including cis/trans loops and TADs, emerge spontaneously from soluble components.

• Why it matters: Understanding how cohesin loop extrusion and architectural DNA-binding proteins integrate to form higher-order genome structure is still incomplete, and early embryogenesis lacks transcriptional confounds.
• What they did: The authors reconstituted complex chromatin using syncytial embryo extracts and used nucleosome mapping and Micro-C to detect emerging 3D features, then analyzed the eve locus.
• The result: At the eve locus, TAD formation is incompatible with a simple loop extrusion model and instead requires direct pairing of boundary elements mediated by the insulator protein Su(Hw), enabling mechanistic dissection in vitro.

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