Cytidine deaminases APOBEC3C and APOBEC3D promote DNA replication stress resistance in pancreatic cancer cells

Ubhi, Tajinder, Zaslaver, Olga, Quaile, Andrew T, Plenker, Dennis, Cao, Pinjiang, Pham, Nhu-An, Békési, Angéla, Jang, Gun-Ho, O'Kane, Grainne M, Notta, Faiyaz, Moffat, Jason, Wilson, Julie M, Gallinger, Steven, Vértessy, Beáta G, Tuveson, David A, Röst, Hannes L, Brown, Grant W (March 2024) Cytidine deaminases APOBEC3C and APOBEC3D promote DNA replication stress resistance in pancreatic cancer cells. Nature Cancer. ISSN 2662-1347 (Public Dataset)

Abstract

Gemcitabine is a potent inhibitor of DNA replication and is a mainstay therapeutic for diverse cancers, particularly pancreatic ductal adenocarcinoma (PDAC). However, most tumors remain refractory to gemcitabine therapies. Here, to define the cancer cell response to gemcitabine, we performed genome-scale CRISPR-Cas9 chemical-genetic screens in PDAC cells and found selective loss of cell fitness upon disruption of the cytidine deaminases APOBEC3C and APOBEC3D. Following gemcitabine treatment, APOBEC3C and APOBEC3D promote DNA replication stress resistance and cell survival by deaminating cytidines in the nuclear genome to ensure DNA replication fork restart and repair in PDAC cells. We provide evidence that the chemical-genetic interaction between APOBEC3C or APOBEC3D and gemcitabine is absent in nontransformed cells but is recapitulated across different PDAC cell lines, in PDAC organoids and in PDAC xenografts. Thus, we uncover roles for APOBEC3C and APOBEC3D in DNA replication stress resistance and offer plausible targets for improving gemcitabine-based therapies for PDAC.

Item Type:	Paper
Subjects:	diseases & disorders > cancer diseases & disorders diseases & disorders > cancer > cancer types > pancreatic cancer diseases & disorders > cancer > cancer types
CSHL Authors:	Plenker, Dennis Tuveson, David A.
Communities:	CSHL labs > Tuveson lab CSHL Cancer Center Program CSHL Cancer Center Program > Cellular Communication in Cancer Program
SWORD Depositor:	CSHL Elements
Depositing User:	CSHL Elements
Date:	6 March 2024
Date Deposited:	14 Mar 2024 12:57
Last Modified:	14 Mar 2024 12:57
Related URLs:	Publisher
Dataset ID:	SRA: PRJNA844572 https://dcc.icgc.org/releases/release_28/Projects/PACA-CA https://ega-archive.org/datasets/EGAD00001006081 https://depmap.org/portal/download/ Public 23Q2 https://portal.gdc.cancer.gov/projects/TCGA-PAAD
URI:	https://repository.cshl.edu/id/eprint/41464

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