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Das R, Sjöström M, Shrestha R, Yogodzinski C, Egusa EA, Chesner LN, Chen WS, Chou J, Dang DK, Swinderman JT, Ge A, Hua JT, Kabir S, Quigley DA, Small EJ, Ashworth A, Feng FY, Gilbert LA. An integrated functional and clinical genomics approach reveals genes driving aggressive metastatic prostate cancer. Nat Commun 2021; 12:4601. [PMID: 34326322 PMCID: PMC8322386 DOI: 10.1038/s41467-021-24919-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 07/15/2021] [Indexed: 02/07/2023] Open
Abstract
Genomic sequencing of thousands of tumors has revealed many genes associated with specific types of cancer. Similarly, large scale CRISPR functional genomics efforts have mapped genes required for cancer cell proliferation or survival in hundreds of cell lines. Despite this, for specific disease subtypes, such as metastatic prostate cancer, there are likely a number of undiscovered tumor specific driver genes that may represent potential drug targets. To identify such genetic dependencies, we performed genome-scale CRISPRi screens in metastatic prostate cancer models. We then created a pipeline in which we integrated pan-cancer functional genomics data with our metastatic prostate cancer functional and clinical genomics data to identify genes that can drive aggressive prostate cancer phenotypes. Our integrative analysis of these data reveals known prostate cancer specific driver genes, such as AR and HOXB13, as well as a number of top hits that are poorly characterized. In this study we highlight the strength of an integrated clinical and functional genomics pipeline and focus on two top hit genes, KIF4A and WDR62. We demonstrate that both KIF4A and WDR62 drive aggressive prostate cancer phenotypes in vitro and in vivo in multiple models, irrespective of AR-status, and are also associated with poor patient outcome.
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Affiliation(s)
- Rajdeep Das
- Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA, USA
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Martin Sjöström
- Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA, USA
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Raunak Shrestha
- Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA, USA
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Christopher Yogodzinski
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
- Department of Urology, University of California, San Francisco, San Francisco, CA, USA
| | - Emily A Egusa
- Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA, USA
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Lisa N Chesner
- Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA, USA
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - William S Chen
- Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA, USA
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Jonathan Chou
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
- Division of Hematology and Oncology, Department of Medicine, University of California, San Francisco, San Francisco, CA, USA
| | - Donna K Dang
- Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA, USA
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Jason T Swinderman
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
- Department of Urology, University of California, San Francisco, San Francisco, CA, USA
| | - Alex Ge
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
- Department of Urology, University of California, San Francisco, San Francisco, CA, USA
| | - Junjie T Hua
- Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA, USA
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Shaheen Kabir
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
- Department of Urology, University of California, San Francisco, San Francisco, CA, USA
| | - David A Quigley
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
- Department of Urology, University of California, San Francisco, San Francisco, CA, USA
- Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, CA, USA
| | - Eric J Small
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
- Division of Hematology and Oncology, Department of Medicine, University of California, San Francisco, San Francisco, CA, USA
| | - Alan Ashworth
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
- Division of Hematology and Oncology, Department of Medicine, University of California, San Francisco, San Francisco, CA, USA
| | - Felix Y Feng
- Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA, USA.
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA.
- Department of Urology, University of California, San Francisco, San Francisco, CA, USA.
- Division of Hematology and Oncology, Department of Medicine, University of California, San Francisco, San Francisco, CA, USA.
| | - Luke A Gilbert
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA.
- Department of Urology, University of California, San Francisco, San Francisco, CA, USA.
- Department of Cellular & Molecular Pharmacology, University of California, San Francisco, San Francisco, CA, USA.
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Chesner LN, Essawy M, Warner C, Campbell C. DNA-protein crosslinks are repaired via homologous recombination in mammalian mitochondria. DNA Repair (Amst) 2020; 97:103026. [PMID: 33316746 PMCID: PMC7855827 DOI: 10.1016/j.dnarep.2020.103026] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 09/24/2020] [Accepted: 11/12/2020] [Indexed: 11/19/2022]
Abstract
While mammalian mitochondria are known to possess a robust base excision repair system, direct evidence for the existence of additional mitochondrial DNA repair pathways is elusive. Herein a PCR-based assay was employed to demonstrate that plasmids containing DNA-protein crosslinks are rapidly repaired following electroporation into isolated mammalian mitochondria. Several lines of evidence argue that this repair occurs via homologous recombination. First, DNA-protein crosslinks present on plasmid DNA homologous to the mitochondrial genome were efficiently repaired (21 % repair in three hours), whereas a DNA-protein crosslink present on DNA that lacked homology to the mitochondrial genome remained unrepaired. Second, DNA-protein crosslinks present on plasmid DNA lacking homology to the mitochondrial genome were repaired when they were co-electroporated into mitochondria with an undamaged, homologous plasmid DNA molecule. Third, no repair was observed when DNA-protein crosslink-containing plasmids were electroporated into mitochondria isolated from cells pre-treated with the Rad51 inhibitor B02. These findings suggest that mitochondria utilize homologous recombination to repair endogenous and xenobiotic-induced DNA-protein crosslinks. Consistent with this interpretation, cisplatin-induced mitochondrial DNA-protein crosslinks accumulated to higher levels in cells pre-treated with B02 than in control cisplatin-treated cells. These results represent the first evidence of how spontaneous and xenobiotic-induced DNA-protein crosslinks are removed from mitochondrial DNA.
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Affiliation(s)
- Lisa N Chesner
- Department of Pharmacology, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Maram Essawy
- Department of Pharmacology, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Cecilia Warner
- Department of Pharmacology, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Colin Campbell
- Department of Pharmacology, University of Minnesota, Minneapolis, MN, 55455, USA.
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Chesner LN, Campbell C. A quantitative PCR-based assay reveals that nucleotide excision repair plays a predominant role in the removal of DNA-protein crosslinks from plasmids transfected into mammalian cells. DNA Repair (Amst) 2018; 62:18-27. [PMID: 29413806 DOI: 10.1016/j.dnarep.2018.01.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 01/07/2018] [Accepted: 01/08/2018] [Indexed: 12/26/2022]
Abstract
DNA-protein crosslinks (DPCs) are complex DNA lesions that induce mutagenesis and cell death. DPCs are created by common antitumor drugs, reactive oxygen species, and endogenous aldehydes. Since these agents create other types of DNA damage in addition to DPCs, identification of the mechanisms of DPC repair is challenging. In this study, we created plasmid substrates containing site-specific DPC lesions, as well as plasmids harboring lesions that are selectively repaired by the base excision or nucleotide excision repair (NER) pathways. These substrates were transfected into mammalian cells and a quantitative real-time PCR assay employed to study their repair. This assay revealed that DPC lesions were rapidly repaired in wild-type human and Chinese hamster derived cells, as were plasmids harboring an oxoguanine residue (base excision repair substrate) or cholesterol lesion (NER substrate). Interestingly, the DPC substrate was repaired in human cells nearly three times as efficiently as in Chinese hamster cells (>75% vs ∼25% repair at 8 h post-transfection), while there was no significant species-specific difference in the efficiency with which the cholesterol lesion was repaired (∼60% repair). Experiments revealed that both human and hamster cells deficient in NER due to mutations in the xeroderma pigmentosum A or D genes were five to ten-fold less able to repair the cholesterol and DPC lesions than were wild-type control clones, and that both the global genome and transcription-coupled sub-pathways of NER were capable of repairing DPCs. In addition, analyses using this PCR-based assay revealed that a 4 kDa peptide DNA crosslink was repaired nearly twice as efficiently as was a ∼38 kDa DPC, suggesting that proteolytic degradation of crosslinked proteins occurs during DPC repair. These results highlight the utility of this PCR-based assay to study DNA repair and indicate that the NER machinery rapidly and efficiently repairs plasmid DPC lesions in mammalian cells.
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Affiliation(s)
- Lisa N Chesner
- Department of Pharmacology, University of Minnesota-Twin Cities, Minneapolis, MN, 55455, USA
| | - Colin Campbell
- Department of Pharmacology, University of Minnesota-Twin Cities, Minneapolis, MN, 55455, USA.
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Chesner LN, Degner A, Sangaraju D, Yomtoubian S, Wickramaratne S, Malayappan B, Tretyakova N, Campbell C. Cellular Repair of DNA-DNA Cross-Links Induced by 1,2,3,4-Diepoxybutane. Int J Mol Sci 2017; 18:ijms18051086. [PMID: 28524082 PMCID: PMC5454995 DOI: 10.3390/ijms18051086] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 05/04/2017] [Accepted: 05/11/2017] [Indexed: 11/25/2022] Open
Abstract
Xenobiotic-induced interstrand DNA–DNA cross-links (ICL) interfere with transcription and replication and can be converted to toxic DNA double strand breaks. In this work, we investigated cellular responses to 1,4-bis-(guan-7-yl)-2,3-butanediol (bis-N7G-BD) cross-links induced by 1,2,3,4-diepoxybutane (DEB). High pressure liquid chromatography electrospray ionization tandem mass spectrometry (HPLC-ESI+-MS/MS) assays were used to quantify the formation and repair of bis-N7G-BD cross-links in wild-type Chinese hamster lung fibroblasts (V79) and the corresponding isogenic clones V-H1 and V-H4, deficient in the XPD and FANCA genes, respectively. Both V-H1 and V-H4 cells exhibited enhanced sensitivity to DEB-induced cell death and elevated bis-N7G-BD cross-links. However, relatively modest increases of bis-N7G-BD adduct levels in V-H4 clones did not correlate with their hypersensitivity to DEB. Further, bis-N7G-BD levels were not elevated in DEB-treated human clones with defects in the XPA or FANCD2 genes. Comet assays and γ-H2AX focus analyses conducted with hamster cells revealed that ICL removal was associated with chromosomal double strand break formation, and that these breaks persisted in V-H4 cells as compared to control cells. Our findings suggest that ICL repair in cells with defects in the Fanconi anemia repair pathway is associated with aberrant re-joining of repair-induced double strand breaks, potentially resulting in lethal chromosome rearrangements.
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Affiliation(s)
- Lisa N Chesner
- Department of Pharmacology, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Amanda Degner
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Dewakar Sangaraju
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Shira Yomtoubian
- Department of Pharmacology, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Susith Wickramaratne
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Bhaskar Malayappan
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Natalia Tretyakova
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Colin Campbell
- Department of Pharmacology, University of Minnesota, Minneapolis, MN 55455, USA.
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