Cited by 128BRCA gene mutations in cancerCancer Genomics and DiagnosticsDNA Repair Mechanisms

The landscape of somatic genetic alterations in breast cancers from ATM germline mutation carriers

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Weigelt, Britta, Bi, Rui, Kumar, Rahul, Blecua, Pedro, Mandelker, Diana L, Geyer, Felipe C, Pareja, Fresia, James, Paul A +18 more·2018·JNCI: Journal of the National Cancer Institute

Abstract

Pathogenic germline variants in ataxia-telangiectasia mutated (ATM), a gene that plays a role in DNA damage response and cell cycle checkpoints, confer an increased breast cancer (BC) risk. Here, we investigated the phenotypic characteristics and landscape of somatic genetic alterations in 24 BCs from ATM germline mutation carriers by whole-exome and targeted sequencing. ATM-associated BCs were consistently hormone receptor positive and largely displayed minimal immune infiltrate. Although 79.2% of these tumors exhibited loss of heterozygosity of the ATM wild-type allele, none displayed high activity of mutational signature 3 associated with defective homologous recombination DNA (HRD) repair. No TP53 mutations were found in the ATM-associated BCs. Analysis of an independent data set confirmed that germline ATM variants and TP53 somatic mutations are mutually exclusive. Our findings indicate that ATM-associated BCs often harbor bi-allelic inactivation of ATM, are phenotypically distinct from BRCA1/2-associated BCs, lack HRD-related mutational signatures, and that TP53 and ATM genetic alterations are likely epistatic.

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  • Tumours with TP53, ATM, or CHEK2 germline variants lack BRCA-deficient signatures but have highly complex clustered chromosomal rearrangements.

    “Despite the role of TP53, ATM and CHEK2 in DNA-damage signalling and double-strand breaks detection, these tumours do not show evidence of BRCA-deficient signatures, as previously described [9, 13, 19], but instead they harbour highly complex clustered chromosomal rearrangements.”

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Authors
Weigelt, B., Bi, R., Kumar, R., Blecua, P., Mandelker, D. L., Geyer, F. C., Pareja, F., James, P. A., kConFab Investigators, Couch, F. J., Eccles, D. M., Blows, F., Pharoah, P., Li, A., Selenica, P., Lim, R. S., Jayakumaran, G., Waddell, N., Shen, R., Norton, L., Wen, H. Y., Powell, S. N., Riaz, N., Robson, M. E., Reis-Filho, J. S., & Chenevix-Trench, G.
Affiliations
  • Memorial Sloan Kettering Cancer Center (US)
  • Peter MacCallum Cancer Centre (AU)
  • Mayo Clinic (US)
  • University of Cambridge (GB)
  • QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia (NW, GCT)
Corresponding author
Reis-Filho, Jorge S
Venue
JNCI: Journal of the National Cancer Institute
Published
2018-02-28
Volume
110
Issue
9
Pages
1030-1034
ISSN
  • 0027-8874 (ISSN-L)
  • 1460-2105
OpenAlex
W2792571019
Cited by
128
References
22
Citations by year
2026: 9 · 2025: 11 · 2024: 13 · 2023: 17 · 2022: 16 · 2021: 19 · 2020: 21 · 2019: 18 · 2018: 4
FWCI
9.49
Type
journal article
Language
en
Open access
Locations
  • JNCI Journal of the National Cancer Institute (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • ePrints Soton (University of Southampton) (acceptedVersion)
  • Apollo (University of Cambridge) (submittedVersion)
  • Apollo
Funders
  • Meredith Israel Thomas Fund
  • Breast Cancer Research Foundation
  • National Institutes of Health
  • National Cancer Institute (P30CA008748)
  • NIH (CA192393, CA176785)
  • National Health and Medical Research Council of Australia
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › BRCA gene mutations in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer Genomics and Diagnostics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
breast cancer, somatic alterations, loss of heterozygosity, TP53 mutation, epistasis, hormone receptor-positive breast cancer, tumor immune infiltrate, DNA damage response
MeSH terms
Exome Sequencing, Adult, Aged, Breast Neoplasms, Female, Heterozygote, Humans, Middle Aged, Mutation, Biomarkers, Tumor, Germ-Line Mutation, Genetic Predisposition to Disease, Genomics, Genetic Association Studies, Ataxia Telangiectasia Mutated Proteins

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