PARP-1 regulates DNA repair factor availability.
Publication/Presentation Date
12-1-2018
Abstract
PARP-1 holds major functions on chromatin, DNA damage repair and transcriptional regulation, both of which are relevant in the context of cancer. Here, unbiased transcriptional profiling revealed the downstream transcriptional profile of PARP-1 enzymatic activity. Further investigation of the PARP-1-regulated transcriptome and secondary strategies for assessing PARP-1 activity in patient tissues revealed that PARP-1 activity was unexpectedly enriched as a function of disease progression and was associated with poor outcome independent of DNA double-strand breaks, suggesting that enhanced PARP-1 activity may promote aggressive phenotypes. Mechanistic investigation revealed that active PARP-1 served to enhance E2F1 transcription factor activity, and specifically promoted E2F1-mediated induction of DNA repair factors involved in homologous recombination (HR). Conversely, PARP-1 inhibition reduced HR factor availability and thus acted to induce or enhance "BRCA-ness". These observations bring new understanding of PARP-1 function in cancer and have significant ramifications on predicting PARP-1 inhibitor function in the clinical setting.
Volume
10
Issue
12
ISSN
1757-4684
Published In/Presented At
Schiewer, M. J., Mandigo, A. C., Gordon, N., Huang, F., Gaur, S., de Leeuw, R., Zhao, S. G., Evans, J., Han, S., Parsons, T., Birbe, R., McCue, P., McNair, C., Chand, S. N., Cendon-Florez, Y., Gallagher, P., McCann, J. J., Poudel Neupane, N., Shafi, A. A., Dylgjeri, E., … Knudsen, K. E. (2018). PARP-1 regulates DNA repair factor availability. EMBO molecular medicine, 10(12), e8816. https://doi.org/10.15252/emmm.201708816
Disciplines
Business Administration, Management, and Operations | Health and Medical Administration | Management Sciences and Quantitative Methods
PubMedID
30467127
Department(s)
Administration and Leadership
Document Type
Article