A developmental condensin I complex assists the Paramecium PiggyMac domesticated transposase during programmed DNA elimination.
Prokaryotes and eukaryotes use diverse strategies to cope with invading mobile genetic elements, including programmed DNA elimination (PDE). In the ciliate Paramecium, elimination of transposable elements and their relics requires the PiggyMac (Pgm) endonuclease and its five PgmL partners, yet how this machinery is targeted to cleavage sites remains unclear. Here, we identified condensin I subunits in the proximity proteomes of Pgm and PgmL4. We show that they belong to a condensin complex that is essential for PDE and localizes to developing somatic nuclei. Depleting the development-specific subunits of this complex blocks DNA elimination, phenocopying a Pgm depletion. Developmental condensin is required for the correct nuclear localization of Pgm and some of the PgmLs. Moreover, Pgm and these PgmLs coimmunoprecipitate with condensin I. Our findings uncover functional and physical interactions between a eukaryotic DNA cleavage machinery and a specialized condensin complex that is critical for PDE in a nondividing nucleus.
Authors
- Vinciane Régnier (ORCID: https://orcid.org/0000-0002-2601-553X)
- Coralie Zangarelli (ORCID: https://orcid.org/0000-0002-1645-3210)
- Guillaume Chevreux (ORCID: https://orcid.org/0000-0003-3452-2125)
- Valerio Vitali (ORCID: https://orcid.org/0000-0003-3593-1510)
- Mélanie Bazin-Gelis (ORCID: https://orcid.org/0000-0001-5670-1453)
- Anne‐Marie Tassin (ORCID: https://orcid.org/0000-0002-6083-9460)
- Marc Guérineau (ORCID: https://orcid.org/0000-0002-0546-3106)
- Olivier Arnaiz (ORCID: https://orcid.org/0000-0002-9626-1015)
- Julien Bischerour (ORCID: https://orcid.org/0000-0002-5254-3395)
- Mireille Bétermier (ORCID: https://orcid.org/0000-0002-5407-6292)
- Thomas Balan (ORCID: https://orcid.org/0009-0008-6487-3050)
- Marina Giovannetti
- Aurelie Camprodon
- Camille Poitrenaud
- Louise Abbou
- Abdulwahab Altair
- Amenaide Boutte du Jonchay
- Emma Schumacher
- Sandra Duharcourt
Institutions
- Centre National de la Recherche Scientifique (FR)
- Smith College (US)
- Université Paris Cité (FR)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- Université Paris-Saclay (FR)
- Institut de Biologie Intégrative de la Cellule (FR)
- Institut Jacques Monod (FR)
- Laboratoire d'études sur les monothéismes (FR)
- CEA Paris-Saclay (FR)
- Institut Supérieur des Biotechnologies de Paris (FR)
Publication Details
- Journal
- PubMed
- Published
- 2026-04-13
- DOI
- https://doi.org/10.1093/nar/gkag351
- Primary Topic
- Protist diversity and phylogeny
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Biogen
- Agence Nationale de la Recherche
- Institut National de la Santé et de la Recherche Médicale
- Centre National de la Recherche Scientifique
- Institut National Du Cancer