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2024-11-12

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cc-by (c) Lorena Espinar et al., 2024
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/219278

Nuclear IMPDH2 controls the DNA damage response by modulating PARP1 activity

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https://doi.org/https://doi.org/10.1038/s41467-024-53877-z

Resum

Nuclear metabolism and DNA damage response are intertwined processes, but the precise molecular links remain elusive. Here, we explore this crosstalk using triple-negative breast cancer (TNBC) as a model, a subtype often prone to DNA damage accumulation. We show that the de novo purine synthesis enzyme IMPDH2 is enriched on chromatin in TNBC compared to other subtypes. IMPDH2 chromatin localization is DNA damage dependent, and IMPDH2 repression leads to DNA damage accumulation. On chromatin, IMPDH2 interacts with and modulates PARP1 activity by controlling the nuclear availability of NAD+ to fine-tune the DNA damage response. However, when IMPDH2 is restricted to the nucleus, it depletes nuclear NAD+, leading to PARP1 cleavage and cell death. Our study identifies a non-canonical nuclear role for IMPDH2, acting as a convergence point of nuclear metabolism and DNA damage response

Matèries

Metabolisme, ADN, Càncer de mama

Matèries (anglès)

Metabolism, DNA, Breast cancer

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Articles publicats en revistes (Biomedicina)

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ESPINAR, Lorena, GARCÍA CAO, Marta, SCHMIDT, Alisa, KOURTIS, Savvas, GAÑEZ ZAPATER, Antoni, ARANDA VALLEJO, Carla, GHOSE, Ritobrata, GARCÍA LÓPEZ, Laura, SHERAJ, Ilir, PARDO LORENTE, Natalia, BANTULÀ, Marina, PASCUAL REGUANT, Laura, DARAI, Evangelia, GUIROLA TSIBULOVA, María, MONTERO BORONAT, Joan, SDELCI, Sara. Nuclear IMPDH2 controls the DNA damage response by modulating PARP1 activity. _Nature Communications_. 2024. Vol. 15, núm. 1. [consulta: 24 de gener de 2026]. ISSN: 2041-1723. [Disponible a: https://hdl.handle.net/2445/219278]

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