Spatial genome organization in nematodes with programmed DNA elimination.

Programmed DNA elimination in nematodes involves conserved 3D genome reorganization, with CBRs engaging in pre- and during-PDE interactions across species.

• Why it matters: Understanding PDE mechanisms is crucial because it challenges genome stability and impacts nematode development, with implications for parasitology and genome biology.
• What they did: Using Hi-C, the study examined 3D genome interactions in Ascaris and Parascaris univalens, revealing that CBRs form specific spatial contacts before and during PDE, affecting chromosome structure.
• The result: The findings show that PDE induces consistent compartmentalization changes, with CBRs defining domain boundaries, enabling the retention or elimination of DNA, and revealing conserved genome reorganization processes.