Article ; Online: PARP1, DIDO3, and DHX9 Proteins Mutually Interact in Mouse Fibroblasts, with Effects on DNA Replication Dynamics, Senescence, and Oncogenic Transformation.
2024 Volume 13, Issue 2
Abstract: The regulated formation and resolution of R-loops is a natural process in physiological gene expression. Defects in R-loop metabolism can lead to DNA replication stress, which is associated with a variety of diseases and, ultimately, with cancer. The ... ...
Abstract | The regulated formation and resolution of R-loops is a natural process in physiological gene expression. Defects in R-loop metabolism can lead to DNA replication stress, which is associated with a variety of diseases and, ultimately, with cancer. The proteins PARP1, DIDO3, and DHX9 are important players in R-loop regulation. We previously described the interaction between DIDO3 and DHX9. Here, we show that, in mouse embryonic fibroblasts, the three proteins are physically linked and dependent on PARP1 activity. The C-terminal truncation of DIDO3 leads to the impairment of this interaction; concomitantly, the cells show increased replication stress and senescence. DIDO3 truncation also renders the cells partially resistant to in vitro oncogenic transformation, an effect that can be reversed by immortalization. We propose that PARP1, DIDO3, and DHX9 proteins form a ternary complex that regulates R-loop metabolism, preventing DNA replication stress and subsequent senescence. |
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MeSH term(s) | Animals ; Mice ; DNA Replication ; Fibroblasts ; Poly (ADP-Ribose) Polymerase-1/metabolism ; Poly (ADP-Ribose) Polymerase-1/physiology ; DEAD-box RNA Helicases/metabolism ; DEAD-box RNA Helicases/physiology ; Cellular Senescence/genetics ; Carcinogenesis/genetics |
Chemical Substances | Parp1 protein, mouse (EC 2.4.2.30) ; Poly (ADP-Ribose) Polymerase-1 (EC 2.4.2.30) ; Dido protein, mouse ; Dhx9 protein, mouse ; DEAD-box RNA Helicases (EC 3.6.4.13) |
Language | English |
Publishing date | 2024-01-15 |
Publishing country | Switzerland |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ZDB-ID | 2661518-6 |
ISSN | 2073-4409 ; 2073-4409 |
ISSN (online) | 2073-4409 |
ISSN | 2073-4409 |
DOI | 10.3390/cells13020159 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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