Files
Document type
ArticleVersion
Published versionPublication date
Publication license
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/219278
Nuclear IMPDH2 controls the DNA damage response by modulating PARP1 activity
Journal Title
Director/Tutor
Journal ISSN
Volume Title
Related resource
Abstract
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
Subject
Subject (English)
Citation
Collections
Citation
ESPINAR, Lorena, et al. Nuclear IMPDH2 controls the DNA damage response by modulating PARP1 activity. Nature Communications. 2024. Vol. 15, num. 1. ISSN 2041-1723. [consulted: 6 of June of 2026]. Available at: https://hdl.handle.net/2445/219278