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Transcriptional changes by PARP7 inhibitor in cancer cell lines

ABSTRACT: Transcriptional changes by PARP7 inhibitor in cancer cell lines

PROVIDER: PRJNA737116 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR14794001.fastq.gz	Fastqsanger.gz
	SRR14794002.fastq.gz	Fastqsanger.gz
	SRR14794003.fastq.gz	Fastqsanger.gz
	SRR14794004.fastq.gz	Fastqsanger.gz
	SRR14794005.fastq.gz	Fastqsanger.gz

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Transcriptional changes by PARP7 inhibitor in cancer cell lines

Project description:PARP7 is a monoPARP that catalyzes the transfer of single units of ADP-ribose onto substrates to change their function. PARP7 expression is increased by aromatic hydrocarbons and cellular stress, and the PARP7 gene is amplified in cancers, especially in those of the upper aerodigestive tract. PARP7 is a negative regulator of nucleic acid sensing in tumor cells. Inhibition of PARP7 restores Type I IFN signaling responses to nucleic acids in tumor models. Restored signaling can directly inhibit cell proliferation and activate the immune system, both of which contribute to tumor regression. RBN-2397 is a potent and selective inhibitor of PARP7. To further investigate the mechanism of action of RBN-2397 and identify potential biomarkers we investigated transcriptional changes after RBN-2397 treatment in two PARP7 inhibitor sensitive cell lines, NCI-H1373 and NCI-H647, by RNA sequencing.

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Project description:PARP7 inhibitors reduce tumor growth in a cell-autonomous manner and by enhancing immune recognition through restoring nucleic acid (NA)-sensing-dependent innate immune signaling. However, the molecular targets of PARP7-mediated ADP-ribosylation, regulating cell survival and innate immune signaling, remained elusive. Here, we identified PARP7 as a nuclear and cysteine-specific mono-ART that ADP-ribosylates proteins critical for regulating gene expression, such as the AP-1 transcription factor FRA1. Upon PARP7 inhibition the loss of FRA1 ADP-ribosylation increased FRA1 degradation in a PSMC3 and proteasomal-dependent manner. To further investigate how FRA1 promotes cell survival, we investigated transcriptional changes after RBN-2397 treatment and FRA1 knockdown in the PARP7 inhibitor sensitive cell line NCI-H1975 by RNA sequencing.

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Project description:PARP7 is a monoPARP that catalyzes the transfer of single units of ADP-ribose onto substrates to change their function. PARP7 expression is increased by aromatic hydrocarbons and cellular stress, and the PARP7 gene is amplified in cancers, especially in those of the upper aerodigestive tract. PARP7 is a negative regulator of nucleic acid sensing in tumor cells. Inhibition of PARP7 restores Type I IFN signaling responses to nucleic acids in tumor models. Restored signaling can directly inhibit cell proliferation and activate the immune system, both of which contribute to tumor regression. RBN-2397 is a potent and selective inhibitor of PARP7. To further explore how RBN-2397 inhibits NCI-H1373 cell proliferation, we performed unbiased genetic screens using whole-genome CRISPRi and CRISPRa libraries (le Sage et al., 2017; Jost and Weissman, 2018). Comparison of CRISPRi and CRISPRa phenotype scores highlights genes with opposing functionality upon RBN-2397 treatment.

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