Cited by 121DNA Repair MechanismsBRCA gene mutations in cancerPARP inhibition in cancer therapy

The CIP2A–TOPBP1 axis safeguards chromosome stability and is a synthetic lethal target for BRCA-mutated cancer

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Adam, Salomé, Rossi, Silvia Emma, Moatti, Nathalie, De Marco Zompit, Mara, Xue, Yibo, Ng, Timothy F., Álvarez-Quilón, Alejandro, Desjardins, Jessica +17 more·2021·Nature Cancer

Abstract

BRCA1/2-mutated cancer cells adapt to the genome instability caused by their deficiency in homologous recombination (HR). Identification of these adaptive mechanisms may provide therapeutic strategies to target tumors caused by the loss of these genes. In the present study, we report genome-scale CRISPR-Cas9 synthetic lethality screens in isogenic pairs of BRCA1- and BRCA2-deficient cells and identify CIP2A as an essential gene in BRCA1- and BRCA2-mutated cells. CIP2A is cytoplasmic in interphase but, in mitosis, accumulates at DNA lesions as part of a complex with TOPBP1, a multifunctional genome stability factor. Unlike PARP inhibition, CIP2A deficiency does not cause accumulation of replication-associated DNA lesions that require HR for their repair. In BRCA-deficient cells, the CIP2A-TOPBP1 complex prevents lethal mis-segregation of acentric chromosomes that arises from impaired DNA synthesis. Finally, physical disruption of the CIP2A-TOPBP1 complex is highly deleterious in BRCA-deficient tumors, indicating that CIP2A represents an attractive synthetic lethal therapeutic target for BRCA1- and BRCA2-mutated cancers.

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Crossref · 10.1038/s43018-021-00266-w

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  • CIP2A is a central DNA damage response protein essential for BRCA-mutated triple-negative breast cancer cells.

    “However, recent identification of CIP2A as a central DNA damage response (DDR) protein essential for BRCA-mutated triple-negative breast cancer (TNBC) cells24,26, indicates that CIP2A has broader role in cancer beyond MYC regulation.”
  • USP37-CDC45 scores high by SPOC but is absent from STRING, consistent with the finding that CDC45 recruits USP37 to the replisome.

    “Another example is USP37-CDC45, which is consistent with our finding that CDC45 recruits USP37 to the replisome56.”
  • In proteome wide screens, SPOC readily identified STK19, USP37, and DONSON partners whose function we validated.

    “The power of SPOC is illustrated by the fact that in proteome wide screens, it readily identified STK19, USP37, and DONSON partners whose function we validated23,54,56.”

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Authors
Adam, S., Rossi, S. E., Moatti, N., De Marco Zompit, M., Xue, Y., Ng, T. F., Álvarez-Quilón, A., Desjardins, J., Bhaskaran, V., Martino, G., Setiaputra, D., Noordermeer, S. M., Ohsumi, T. K., Hustedt, N., Szilard, R. K., Chaudhary, N., Munro, M., Veloso, A., Melo, H., Yin, S. Y., Papp, R., Young, J. T. F., Zinda, M., Stucki, M., & Durocher, D.
Affiliations
  • Mount Sinai Hospital (CA)
  • University of Zurich (CH)
Corresponding author
Durocher, Daniel
Venue
Nature Cancer
Published
2021-11-11
Volume
2
Issue
12
Pages
1357-1371
ISSN
2662-1347 (ISSN-L)
OpenAlex
W3211464220
Cited by
121
References
60
Citations by year
2026: 30 · 2025: 27 · 2024: 23 · 2023: 23 · 2022: 13 · 2021: 5
FWCI
5.02
Type
journal article
Language
en
Open access
Locations
  • Nature Cancer (publishedVersion)
  • PubMed (publishedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, other-oa)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
  • Leiden Repository (Leiden University) (submittedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion, other-oa)
  • Zurich Open Repository and Archive (University of Zurich)
Funders
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (310030_189141)
  • Groeber Foundation
  • Gouvernement du Canada | Instituts de Recherche en Santé du Canada | CIHR Skin Research Training Centre (FDN143343)
  • Krembil Foundation
  • Canadian Cancer Society Research Institute (705644)
  • Repare Therapeutics
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › BRCA gene mutations in cancer
  • Health Sciences › Medicine › Oncology › PARP inhibition in cancer therapy
Keywords
CIP2A, TopBP1, BRCA1 deficiency, BRCA2 deficiency, synthetic lethality, genome stability, chromosome stability, homologous recombination, DNA damage response, PARP inhibition, therapeutic target
MeSH terms
Synthetic Lethal Mutations, Carrier Proteins, DNA, DNA-Binding Proteins, Humans, Neoplasms, Nuclear Proteins, Genomic Instability, Chromosomal Instability, Homologous Recombination

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