Spatial genome organization in nematodes with programmed DNA elimination.

Ascaris CBRs engage in 3D interactions before and during PDE, suggesting physical contacts may contribute to chromosome fragmentation in nematodes.

• Why it matters: Understanding the mechanisms of programmed DNA breakage in nematodes is crucial because PDE disrupts genome integrity and involves chromosome fragmentation, yet its recognition process remains unclear.
• What they did: Using Hi-C, the study examined 3D genome organization in A. lumbricoides, A. suum, and Parascaris univalens, revealing interactions at CBRs and changes in genome compartmentalization during PDE.
• The result: Findings show that CBRs are linked to 3D genome domain boundaries, with conserved compartment changes after PDE, enabling insights into spatial genome organization and evolution in nematodes.