1
|
Gracia B, Montes P, Gutierrez AM, Arun B, Karras GI. Protein-folding chaperones predict structure-function relationships and cancer risk in BRCA1 mutation carriers. Cell Rep 2024; 43:113803. [PMID: 38368609 PMCID: PMC10941025 DOI: 10.1016/j.celrep.2024.113803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 12/28/2023] [Accepted: 02/01/2024] [Indexed: 02/20/2024] Open
Abstract
Predicting the risk of cancer mutations is critical for early detection and prevention, but differences in allelic severity of human carriers confound risk predictions. Here, we elucidate protein folding as a cellular mechanism driving differences in mutation severity of tumor suppressor BRCA1. Using a high-throughput protein-protein interaction assay, we show that protein-folding chaperone binding patterns predict the pathogenicity of variants in the BRCA1 C-terminal (BRCT) domain. HSP70 selectively binds 94% of pathogenic BRCA1-BRCT variants, most of which engage HSP70 more than HSP90. Remarkably, the magnitude of HSP70 binding linearly correlates with loss of folding and function. We identify a prevalent class of human hypomorphic BRCA1 variants that bind moderately to chaperones and retain partial folding and function. Furthermore, chaperone binding signifies greater mutation penetrance and earlier cancer onset in the clinic. Our findings demonstrate the utility of chaperones as quantitative cellular biosensors of variant folding, phenotypic severity, and cancer risk.
Collapse
Affiliation(s)
- Brant Gracia
- Department of Genetics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Patricia Montes
- Department of Genetics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Angelica Maria Gutierrez
- Department of Breast Medical Oncology and Clinical Cancer Genetics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Banu Arun
- Department of Breast Medical Oncology and Clinical Cancer Genetics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Georgios Ioannis Karras
- Department of Genetics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; Genetics and Epigenetics Graduate Program, The University of Texas MD Anderson Cancer Center UTHealth Houston Graduate School of Biomedical Sciences, Houston, TX, USA.
| |
Collapse
|
2
|
Block I, Mateu-Regué À, Do TTN, Miceikaite I, Sdogati D, Larsen MJ, Hao Q, Nielsen HR, Boonen SE, Skytte AB, Jensen UB, Høffding LK, De Nicolo A, Viel A, Tudini E, Parsons MT, Hansen TVO, Rossing M, Kruse TA, Spurdle AB, Thomassen M. Male with an apparently normal phenotype carrying a BRCA1 exon 20 duplication in trans to a BRCA1 frameshift variant. Breast Cancer Res 2024; 26:6. [PMID: 38195559 PMCID: PMC10775606 DOI: 10.1186/s13058-023-01755-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 12/16/2023] [Indexed: 01/11/2024] Open
Abstract
BACKGROUND Reports of dual carriers of pathogenic BRCA1 variants in trans are extremely rare, and so far, most individuals have been associated with a Fanconi Anemia-like phenotype. METHODS We identified two families with a BRCA1 in-frame exon 20 duplication (Ex20dup). In one male individual, the variant was in trans with the BRCA1 frameshift variant c.2475delC p.(Asp825Glufs*21). We performed splicing analysis and used a transcription activation domain (TAD) assay to assess the functional impact of Ex20dup. We collected pedigrees and mapped the breakpoints of the duplication by long- and short-read genome sequencing. In addition, we performed a mitomycin C (MMC) assay from the dual carrier using cultured lymphoblastoid cells. RESULTS Genome sequencing and RNA analysis revealed the BRCA1 exon 20 duplication to be in tandem. The duplication was expressed without skipping any one of the two exon 20 copies, resulting in a lack of wild-type transcripts from this allele. TAD assay indicated that the Ex20dup variant has a functional level similar to the well-known moderate penetrant pathogenic BRCA1 variant c.5096G > A p.(Arg1699Gln). MMC assay of the dual carrier indicated a slightly impaired chromosomal repair ability. CONCLUSIONS This is the first reported case where two BRCA1 variants with demonstrated functional impact are identified in trans in a male patient with an apparently normal clinical phenotype and no BRCA1-associated cancer. The results pinpoint a minimum necessary BRCA1 protein activity to avoid a Fanconi Anemia-like phenotype in compound heterozygous status and yet still predispose carriers to hormone-related cancers. These findings urge caution when counseling families regarding potential Fanconi Anemia risk. Furthermore, prudence should be taken when classifying individual variants as benign based on co-occurrence in trans with well-established pathogenic variants.
Collapse
Affiliation(s)
- Ines Block
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
- Institute of Pharmacology and Clinical Pharmacy, University of Marburg, Marburg, Germany
| | - Àngels Mateu-Regué
- Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Thi Tuyet Nhu Do
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
| | - Ieva Miceikaite
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
- Clinical Genome Center, Human Genetics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Daniel Sdogati
- Lundbeckfonden Center of Excellence NanoCAN, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
- Molecular Oncology, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - Martin J Larsen
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
- Clinical Genome Center, Human Genetics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Qin Hao
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
- Clinical Genome Center, Human Genetics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | | | - Susanne E Boonen
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
| | - Anne-Bine Skytte
- Department of Clinical Genetics, Aarhus University Hospital, Aarhus, Denmark
| | - Uffe Birk Jensen
- Department of Clinical Genetics, Aarhus University Hospital, Aarhus, Denmark
| | - Louise K Høffding
- Center for Clinical Genetics and Genomic Diagnostics, Zealand University Hospital, Roskilde, Denmark
| | - Arcangela De Nicolo
- Center for Omics Sciences, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Alessandra Viel
- Unit of Functional Oncogenetics and Genomics, Centro Di Riferimento Oncologico Di Aviano (CRO) IRCCS, Aviano, (PN), Italy
| | - Emma Tudini
- Population Health Program, QIMR Berghofer Medical Research Institute, Herston, Brisbane, Australia
| | - Michael T Parsons
- Population Health Program, QIMR Berghofer Medical Research Institute, Herston, Brisbane, Australia
| | - Thomas V O Hansen
- Department of Clinical Genetics, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Maria Rossing
- Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Torben A Kruse
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
- Clinical Genome Center, Human Genetics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Amanda B Spurdle
- Population Health Program, QIMR Berghofer Medical Research Institute, Herston, Brisbane, Australia
| | - Mads Thomassen
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark.
- Clinical Genome Center, Human Genetics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark.
| |
Collapse
|
3
|
Hughes T, Rose AM. The emergence of Fanconi anaemia type S: a phenotypic spectrum of biallelic BRCA1 mutations. Front Oncol 2023; 13:1278004. [PMID: 38146508 PMCID: PMC10749362 DOI: 10.3389/fonc.2023.1278004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 10/23/2023] [Indexed: 12/27/2023] Open
Abstract
BRCA1 is involved in the Fanconi anaemia (FA) pathway, which coordinates repair of DNA interstrand cross-links. FA is a rare genetic disorder characterised by bone marrow failure, cancer predisposition and congenital abnormalities, caused by biallelic mutations affecting proteins in the FA pathway. Germline monoallelic pathogenic BRCA1 mutations are known to be associated with hereditary breast/ovarian cancer, however biallelic mutations of BRCA1 were long predicted to be incompatible with embryonic viability, hence BRCA1 was not considered to be a canonical FA gene. Despite this, several patients with biallelic pathogenic BRCA1 mutations and FA-like phenotypes have been identified - defining a new FA type (FA-S) and designating BRCA1 as an FA gene. This report presents a scoping review of the cases of biallelic BRCA1 mutations identified to date, discusses the functional effects of the mutations identified, and proposes a phenotypic spectrum of BRCA1 mutations based upon available clinical and genetic data. We report that this FA-S cohort phenotype includes short stature, microcephaly, facial dysmorphisms, hypo/hyperpigmented lesions, intellectual disability, chromosomal sensitivity to crosslinking agents and predisposition to breast/ovarian cancer and/or childhood cancers, with some patients exhibiting sensitivity to chemotherapy. Unlike most other types of FA, FA-S patients lack bone marrow failure.
Collapse
Affiliation(s)
- Tirion Hughes
- University of Oxford Medical School, Oxford, United Kingdom
| | - Anna M. Rose
- Department of Paediatrics, University of Oxford, Oxford, United Kingdom
| |
Collapse
|
4
|
Gracia B, Montes P, Gutierrez AM, Arun B, Karras GI. Protein-Folding Chaperones Predict Structure-Function Relationships and Cancer Risk in BRCA1 Mutation Carriers. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.14.557795. [PMID: 37745493 PMCID: PMC10515940 DOI: 10.1101/2023.09.14.557795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
Identifying pathogenic mutations and predicting their impact on protein structure, function and phenotype remain major challenges in genome sciences. Protein-folding chaperones participate in structure-function relationships by facilitating the folding of protein variants encoded by mutant genes. Here, we utilize a high-throughput protein-protein interaction assay to test HSP70 and HSP90 chaperone interactions as predictors of pathogenicity for variants in the tumor suppressor BRCA1. Chaperones bind 77% of pathogenic BRCA1-BRCT variants, most of which engaged HSP70 more than HSP90. Remarkably, the magnitude of chaperone binding to variants is proportional to the degree of structural and phenotypic defect induced by BRCA1 mutation. Quantitative chaperone interactions identified BRCA1-BRCT separation-of-function variants and hypomorphic alleles missed by pathogenicity prediction algorithms. Furthermore, increased chaperone binding signified greater cancer risk in human BRCA1 carriers. Altogether, our study showcases the utility of chaperones as quantitative cellular biosensors of variant folding and phenotypic severity. HIGHLIGHTS Chaperones detect an abundance of pathogenic folding variants of BRCA1-BRCT.Degree of chaperone binding reflects severity of structural and phenotypic defect.Chaperones identify separation-of-function and hypomorphic variants. Chaperone interactions indicate penetrance and expressivity of BRCA1 alleles.
Collapse
|
5
|
Öfverholm A, Törngren T, Rosén A, Arver B, Einbeigi Z, Haraldsson K, Ståhlbom AK, Kuchinskaya E, Lindblom A, Melin B, Paulsson-Karlsson Y, Stenmark-Askmalm M, Tham E, von Wachenfeldt A, Kvist A, Borg Å, Ehrencrona H. Extended genetic analysis and tumor characteristics in over 4600 women with suspected hereditary breast and ovarian cancer. BMC Cancer 2023; 23:738. [PMID: 37563628 PMCID: PMC10413543 DOI: 10.1186/s12885-023-11229-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Accepted: 07/24/2023] [Indexed: 08/12/2023] Open
Abstract
BACKGROUND Genetic screening for pathogenic variants (PVs) in cancer predisposition genes can affect treatment strategies, risk prediction and preventive measures for patients and families. For decades, hereditary breast and ovarian cancer (HBOC) has been attributed to PVs in the genes BRCA1 and BRCA2, and more recently other rare alleles have been firmly established as associated with a high or moderate increased risk of developing breast and/or ovarian cancer. Here, we assess the genetic variation and tumor characteristics in a large cohort of women with suspected HBOC in a clinical oncogenetic setting. METHODS Women with suspected HBOC referred from all oncogenetic clinics in Sweden over a six-year inclusion period were screened for PVs in 13 clinically relevant genes. The genetic outcome was compared with tumor characteristics and other clinical data collected from national cancer registries and hospital records. RESULTS In 4622 women with breast and/or ovarian cancer the overall diagnostic yield (the proportion of women carrying at least one PV) was 16.6%. BRCA1/2 PVs were found in 8.9% of women (BRCA1 5.95% and BRCA2 2.94%) and PVs in the other breast and ovarian cancer predisposition genes in 8.2%: ATM (1.58%), BARD1 (0.45%), BRIP1 (0.43%), CDH1 (0.11%), CHEK2 (3.46%), PALB2 (0.84%), PTEN (0.02%), RAD51C (0.54%), RAD51D (0.15%), STK11 (0) and TP53 (0.56%). Thus, inclusion of the 11 genes in addition to BRCA1/2 increased diagnostic yield by 7.7%. The yield was, as expected, significantly higher in certain subgroups such as younger patients, medullary breast cancer, higher Nottingham Histologic Grade, ER-negative breast cancer, triple-negative breast cancer and high grade serous ovarian cancer. Age and tumor subtype distributions differed substantially depending on genetic finding. CONCLUSIONS This study contributes to understanding the clinical and genetic landscape of breast and ovarian cancer susceptibility. Extending clinical genetic screening from BRCA1 and BRCA2 to 13 established cancer predisposition genes almost doubles the diagnostic yield, which has implications for genetic counseling and clinical guidelines. The very low yield in the syndrome genes CDH1, PTEN and STK11 questions the usefulness of including these genes on routine gene panels.
Collapse
Affiliation(s)
- Anna Öfverholm
- Department of Oncology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - Therese Törngren
- Division of Oncology, Department of Clinical Sciences Lund, Lund University, Lund, Sweden
| | - Anna Rosén
- Department of Radiation Sciences, Oncology, Umeå University, Umeå, Sweden
| | - Brita Arver
- Department of Oncology-Pathology, Karolinska Institutet, Stockholm, Sweden
| | - Zakaria Einbeigi
- Department of Oncology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
- Department of Medicine and Oncology, Southern Älvsborg Hospital, Borås, Sweden
| | - Karin Haraldsson
- Division of Oncology, Department of Clinical Sciences Lund, Lund University, Lund, Sweden
| | | | - Ekaterina Kuchinskaya
- Department of Clinical Pathology and Clinical Genetics, Department of Clinical Experimental Medicine, Linköping University, Linköping, Sweden
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
| | - Annika Lindblom
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
- Department of Clinical Genetics, Karolinska University Hospital, Stockholm, Sweden
| | - Beatrice Melin
- Department of Radiation Sciences, Oncology, Umeå University, Umeå, Sweden
| | - Ylva Paulsson-Karlsson
- Department of Immunology, Genetics and Pathology, Uppsala University Hospital, Uppsala, Sweden
| | - Marie Stenmark-Askmalm
- Department of Clinical Pathology and Clinical Genetics, Department of Clinical Experimental Medicine, Linköping University, Linköping, Sweden
- Department of Genetics, Pathology and Molecular Diagnostics, Office for Medical Services, Region Skåne, Lund, Sweden
| | - Emma Tham
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
- Department of Clinical Genetics, Karolinska University Hospital, Stockholm, Sweden
| | - Anna von Wachenfeldt
- Department of Clinical Science and Education at Södersjukhuset, Karolinska Institutet, Stockholm, Sweden
- Department of Oncology, Södersjukhuset, Stockholm, Sweden
| | - Anders Kvist
- Division of Oncology, Department of Clinical Sciences Lund, Lund University, Lund, Sweden
| | - Åke Borg
- Division of Oncology, Department of Clinical Sciences Lund, Lund University, Lund, Sweden
| | - Hans Ehrencrona
- Department of Genetics, Pathology and Molecular Diagnostics, Office for Medical Services, Region Skåne, Lund, Sweden.
- Division of Clinical Genetics, Department of Laboratory Medicine, Lund University, Lund, Sweden.
| |
Collapse
|
6
|
Borlin PR, Brazzola P, Frontzek K, Zanoni P, Morscher RJ, Hench J, Frank S, Kottke R, Rushing EJ, Goeggel Simonetti B, Steindl K, Guerreiro Stucklin AS. Cancer in children with biallelic BRCA1 variants and Fanconi anemia-like features: Report of a malignant brain tumor in a young child. Pediatr Blood Cancer 2022; 69:e29680. [PMID: 35373906 DOI: 10.1002/pbc.29680] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 02/08/2022] [Accepted: 03/02/2022] [Indexed: 11/08/2022]
Affiliation(s)
- Petra R Borlin
- Department of Oncology and Children's Research Center, University Children's Hospital of Zurich, Zurich, Switzerland
| | - Pierluigi Brazzola
- Clinic of Pediatrics, Pediatric Institute of Southern Switzerland, EOC, Bellinzona, Switzerland
| | - Karl Frontzek
- Institute of Neuropathology, University Hospital Zurich, Zurich, Switzerland
| | - Paolo Zanoni
- Institute of Medical Genetics, University of Zurich, Zurich, Switzerland
| | - Raphael J Morscher
- Department of Oncology and Children's Research Center, University Children's Hospital of Zurich, Zurich, Switzerland
| | - Jurgen Hench
- Department of Neuropathology, Institute of Pathology, Basel University Hospital, Basel, Switzerland
| | - Stephan Frank
- Department of Neuropathology, Institute of Pathology, Basel University Hospital, Basel, Switzerland
| | - Raimund Kottke
- Department of Diagnostic Imaging, University Children's Hospital Zurich, Zurich, Switzerland
| | - Elisabeth J Rushing
- Institute of Neuropathology, University Hospital Zurich, Zurich, Switzerland
| | - Barbara Goeggel Simonetti
- Clinic of Pediatrics, Pediatric Institute of Southern Switzerland, EOC, Bellinzona, Switzerland.,Department of Neurology, Inselspital, Bern University Hospital, and University of Bern, Bern, Switzerland.,Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, Switzerland
| | - Katharina Steindl
- Institute of Medical Genetics, University of Zurich, Zurich, Switzerland
| | - Ana S Guerreiro Stucklin
- Department of Oncology and Children's Research Center, University Children's Hospital of Zurich, Zurich, Switzerland
| |
Collapse
|
7
|
Fierheller CT, Guitton-Sert L, Alenezi WM, Revil T, Oros KK, Gao Y, Bedard K, Arcand SL, Serruya C, Behl S, Meunier L, Fleury H, Fewings E, Subramanian DN, Nadaf J, Bruce JP, Bell R, Provencher D, Foulkes WD, El Haffaf Z, Mes-Masson AM, Majewski J, Pugh TJ, Tischkowitz M, James PA, Campbell IG, Greenwood CMT, Ragoussis J, Masson JY, Tonin PN. A functionally impaired missense variant identified in French Canadian families implicates FANCI as a candidate ovarian cancer-predisposing gene. Genome Med 2021; 13:186. [PMID: 34861889 PMCID: PMC8642877 DOI: 10.1186/s13073-021-00998-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 10/27/2021] [Indexed: 12/14/2022] Open
Abstract
Background Familial ovarian cancer (OC) cases not harbouring pathogenic variants in either of the BRCA1 and BRCA2 OC-predisposing genes, which function in homologous recombination (HR) of DNA, could involve pathogenic variants in other DNA repair pathway genes. Methods Whole exome sequencing was used to identify rare variants in HR genes in a BRCA1 and BRCA2 pathogenic variant negative OC family of French Canadian (FC) ancestry, a population exhibiting genetic drift. OC cases and cancer-free individuals from FC and non-FC populations were investigated for carrier frequency of FANCI c.1813C>T; p.L605F, the top-ranking candidate. Gene and protein expression were investigated in cancer cell lines and tissue microarrays, respectively. Results In FC subjects, c.1813C>T was more common in familial (7.1%, 3/42) than sporadic (1.6%, 7/439) OC cases (P = 0.048). Carriers were detected in 2.5% (74/2950) of cancer-free females though female/male carriers were more likely to have a first-degree relative with OC (121/5249, 2.3%; Spearman correlation = 0.037; P = 0.011), suggesting a role in risk. Many of the cancer-free females had host factors known to reduce risk to OC which could influence cancer risk in this population. There was an increased carrier frequency of FANCI c.1813C>T in BRCA1 and BRCA2 pathogenic variant negative OC families, when including the discovery family, compared to cancer-free females (3/23, 13%; OR = 5.8; 95%CI = 1.7–19; P = 0.005). In non-FC subjects, 10 candidate FANCI variants were identified in 4.1% (21/516) of Australian OC cases negative for pathogenic variants in BRCA1 and BRCA2, including 10 carriers of FANCI c.1813C>T. Candidate variants were significantly more common in familial OC than in sporadic OC (P = 0.04). Localization of FANCD2, part of the FANCI-FANCD2 (ID2) binding complex in the Fanconi anaemia (FA) pathway, to sites of induced DNA damage was severely impeded in cells expressing the p.L605F isoform. This isoform was expressed at a reduced level, destabilized by DNA damaging agent treatment in both HeLa and OC cell lines, and exhibited sensitivity to cisplatin but not to a poly (ADP-ribose) polymerase inhibitor. By tissue microarray analyses, FANCI protein was consistently expressed in fallopian tube epithelial cells and only expressed at low-to-moderate levels in 88% (83/94) of OC samples. Conclusions This is the first study to describe candidate OC variants in FANCI, a member of the ID2 complex of the FA DNA repair pathway. Our data suggest that pathogenic FANCI variants may modify OC risk in cancer families. Supplementary Information The online version contains supplementary material available at 10.1186/s13073-021-00998-5.
Collapse
Affiliation(s)
- Caitlin T Fierheller
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Cancer Research Program, Centre for Translational Biology, The Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, Montreal, Quebec, H4A 3 J1, Canada
| | - Laure Guitton-Sert
- Genome Stability Laboratory, CHU de Québec-Université Laval Research Center, Oncology Division, Quebec City, Quebec, Canada.,Department of Molecular Biology, Medical Biochemistry and Pathology, Laval University Cancer Research Center, Quebec City, Quebec, Canada
| | - Wejdan M Alenezi
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Cancer Research Program, Centre for Translational Biology, The Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, Montreal, Quebec, H4A 3 J1, Canada.,Department of Medical Laboratory Technology, Taibah University, Medina, Saudi Arabia
| | - Timothée Revil
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,McGill Genome Centre, McGill University, Montreal, Quebec, Canada
| | - Kathleen K Oros
- Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, Quebec, Canada
| | - Yuandi Gao
- Genome Stability Laboratory, CHU de Québec-Université Laval Research Center, Oncology Division, Quebec City, Quebec, Canada.,Department of Molecular Biology, Medical Biochemistry and Pathology, Laval University Cancer Research Center, Quebec City, Quebec, Canada
| | - Karine Bedard
- Laboratoire de Diagnostic Moléculaire, Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, Quebec, Canada.,Département de pathologie et biologie cellulaire, Université de Montréal, Montreal, Quebec, Canada
| | - Suzanna L Arcand
- Cancer Research Program, Centre for Translational Biology, The Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, Montreal, Quebec, H4A 3 J1, Canada
| | - Corinne Serruya
- Cancer Research Program, Centre for Translational Biology, The Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, Montreal, Quebec, H4A 3 J1, Canada
| | - Supriya Behl
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada
| | - Liliane Meunier
- Centre de recherche du Centre hospitalier de l'Université de Montréal and Institut du cancer de Montréal, Montreal, Quebec, Canada
| | - Hubert Fleury
- Centre de recherche du Centre hospitalier de l'Université de Montréal and Institut du cancer de Montréal, Montreal, Quebec, Canada
| | - Eleanor Fewings
- Department of Medical Genetics, National Institute for Health Research Cambridge Biomedical Research Centre, University of Cambridge, Cambridge, UK
| | - Deepak N Subramanian
- Cancer Genetics Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - Javad Nadaf
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,McGill Genome Centre, McGill University, Montreal, Quebec, Canada
| | - Jeffrey P Bruce
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Rachel Bell
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Diane Provencher
- Centre de recherche du Centre hospitalier de l'Université de Montréal and Institut du cancer de Montréal, Montreal, Quebec, Canada.,Division of Gynecologic Oncology, Université de Montréal, Montreal, Quebec, Canada
| | - William D Foulkes
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Cancer Research Program, Centre for Translational Biology, The Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, Montreal, Quebec, H4A 3 J1, Canada.,Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, Quebec, Canada.,Department of Medicine, McGill University, Montreal, Quebec, Canada
| | - Zaki El Haffaf
- Centre de recherche du Centre Hospitalier de l'Université de Montréal, Montreal, Quebec, Canada
| | - Anne-Marie Mes-Masson
- Centre de recherche du Centre hospitalier de l'Université de Montréal and Institut du cancer de Montréal, Montreal, Quebec, Canada.,Department of Medicine, Université de Montréal, Montreal, Quebec, Canada
| | - Jacek Majewski
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada
| | - Trevor J Pugh
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.,Ontario Institute for Cancer Research, Toronto, Ontario, Canada
| | - Marc Tischkowitz
- Department of Medical Genetics, National Institute for Health Research Cambridge Biomedical Research Centre, University of Cambridge, Cambridge, UK
| | - Paul A James
- Cancer Genetics Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia.,Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Victoria, Australia.,The Parkville Familial Cancer Centre, Peter MacCallum Cancer Centre and The Royal Melbourne Hospital, Melbourne, Victoria, Australia
| | - Ian G Campbell
- Cancer Genetics Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia.,Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Victoria, Australia
| | - Celia M T Greenwood
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, Quebec, Canada.,Gerald Bronfman Department of Oncology, McGill University, Montreal, Quebec, Canada.,Department of Epidemiology, Biostatistics & Occupational Health, McGill University, Montreal, Quebec, Canada
| | - Jiannis Ragoussis
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,McGill Genome Centre, McGill University, Montreal, Quebec, Canada
| | - Jean-Yves Masson
- Genome Stability Laboratory, CHU de Québec-Université Laval Research Center, Oncology Division, Quebec City, Quebec, Canada.,Department of Molecular Biology, Medical Biochemistry and Pathology, Laval University Cancer Research Center, Quebec City, Quebec, Canada
| | - Patricia N Tonin
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada. .,Cancer Research Program, Centre for Translational Biology, The Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, Montreal, Quebec, H4A 3 J1, Canada. .,Department of Medicine, McGill University, Montreal, Quebec, Canada.
| |
Collapse
|
8
|
A Review of Breast Cancer Risk Factors in Adolescents and Young Adults. Cancers (Basel) 2021; 13:cancers13215552. [PMID: 34771713 PMCID: PMC8583289 DOI: 10.3390/cancers13215552] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 10/29/2021] [Accepted: 11/03/2021] [Indexed: 12/26/2022] Open
Abstract
Simple Summary Cancer diagnosed in patients between the ages of 15 and 39 deserves special consideration. Diagnoses within this cohort of adolescents and young adults include childhood cancers which present at an older age than expected, or an early presentation of cancers that are typically observed in older adults, such as breast cancer. Cancers within this age group are associated with worse disease-free and overall survival rates, and the incidence of these cases are rising. Knowing an individual’s susceptibility to disease can change their clinical management and allow for the risk-testing of relatives. This review discusses the risk factors that contribute to breast cancer in this unique cohort of patients, including inherited genetic risk factors, as well as environmental and lifestyle factors. We also describe risk models that allow clinicians to quantify a patient’s lifetime risk of developing disease. Abstract Cancer in adolescents and young adults (AYAs) deserves special consideration for several reasons. AYA cancers encompass paediatric malignancies that present at an older age than expected, or early-onset of cancers that are typically observed in adults. However, disease diagnosed in the AYA population is distinct to those same cancers which are diagnosed in a paediatric or older adult setting. Worse disease-free and overall survival outcomes are observed in the AYA setting, and the incidence of AYA cancers is increasing. Knowledge of an individual’s underlying cancer predisposition can influence their clinical care and may facilitate early tumour surveillance strategies and cascade testing of at-risk relatives. This information can further influence reproductive decision making. In this review we discuss the risk factors contributing to AYA breast cancer, such as heritable predisposition, environmental, and lifestyle factors. We also describe a number of risk models which incorporate genetic factors that aid clinicians in quantifying an individual’s lifetime risk of disease.
Collapse
|
9
|
McReynolds LJ, Biswas K, Giri N, Sharan SK, Alter BP. Genotype-cancer association in patients with Fanconi anemia due to pathogenic variants in FANCD1 (BRCA2) or FANCN (PALB2). Cancer Genet 2021; 258-259:101-109. [PMID: 34687993 DOI: 10.1016/j.cancergen.2021.10.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 08/28/2021] [Accepted: 10/02/2021] [Indexed: 02/07/2023]
Abstract
Fanconi anemia (FA) is the most common inherited bone marrow failure syndrome and a cancer predisposition disorder. Cancers in FA include acute leukemia and solid tumors; the most frequent solid tumor is head and neck squamous cell carcinoma. FA is a primarily autosomal recessive disorder. Several of the genes in which biallelic pathogenic variants cause FA are also autosomal monoallelic cancer predisposition genes e.g. FANCD1 (BRCA2) and FANCN (PALB2). We observed that patients with FA due to biallelic or homozygous pathogenic variants in FANCD1 and FANCN have a unique cancer association. We curated published cases plus our NCI cohort cases, including 71 patients in the FANCD1 group (94 cancers and 69 variants) and 16 patients in the FANCN group (23 cancers and 20 variants). Only patients in FANCD1 and FANCN groups had one or more of these tumors: brain tumors (primarily medulloblastoma), Wilms tumor and neuroblastoma; this is a genotype-specific cancer combination of tumors of embryonal origin. Acute leukemias, seen in all FA genotypes, also occurred in FANCD1 and FANCN group patients at young ages. In silico predictions of pathogenicity for FANCD1 variants were compared with results from a mouse embryonic stem cell-based functional assay. Patients with two null FANCD1 variants did not have an increased frequency of cancer nor earlier onset of cancer compared with those with hypomorphic variants. Patients with FA and these specific cancers should consider genetic testing focused on FANCD1 and FANCN, and patients with these genotypes may consider ongoing surveillance for these specific cancers.
Collapse
Affiliation(s)
- Lisa J McReynolds
- Clinical Genetics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD, USA.
| | - Kajal Biswas
- Mouse Cancer Genetics Program, Center for Cancer Research, National Cancer Institute, Frederick, MD, USA
| | - Neelam Giri
- Clinical Genetics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD, USA
| | - Shyam K Sharan
- Mouse Cancer Genetics Program, Center for Cancer Research, National Cancer Institute, Frederick, MD, USA
| | - Blanche P Alter
- Clinical Genetics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD, USA
| |
Collapse
|
10
|
Fanconi Anaemia, Childhood Cancer and the BRCA Genes. Genes (Basel) 2021; 12:genes12101520. [PMID: 34680915 PMCID: PMC8535386 DOI: 10.3390/genes12101520] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 09/24/2021] [Accepted: 09/25/2021] [Indexed: 12/18/2022] Open
Abstract
Fanconi anaemia (FA) is an inherited chromosomal instability disorder characterised by congenital and developmental abnormalities and a strong cancer predisposition. In less than 5% of cases FA can be caused by bi-allelic pathogenic variants (PGVs) in BRCA2/FANCD1 and in very rare cases by bi-allelic PGVs in BRCA1/FANCS. The rarity of FA-like presentation due to PGVs in BRCA2 and even more due to PGVs in BRCA1 supports a fundamental role of the encoded proteins for normal development and prevention of malignant transformation. While FA caused by BRCA1/2 PGVs is strongly associated with distinct spectra of embryonal childhood cancers and AML with BRCA2-PGVs, and also early epithelial cancers with BRCA1 PGVs, germline variants in the BRCA1/2 genes have also been identified in non-FA childhood malignancies, and thereby implying the possibility of a role of BRCA PGVs also for non-syndromic cancer predisposition in children. We provide a concise review of aspects of the clinical and genetic features of BRCA1/2-associated FA with a focus on associated malignancies, and review novel aspects of the role of germline BRCA2 and BRCA1 PGVs occurring in non-FA childhood cancer and discuss aspects of clinical and biological implications.
Collapse
|
11
|
A Case Report of Germline Compound Heterozygous Mutations in the BRCA1 Gene of an Ovarian and Breast Cancer Patient. Int J Mol Sci 2021; 22:ijms22020889. [PMID: 33477375 PMCID: PMC7830606 DOI: 10.3390/ijms22020889] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 12/29/2020] [Accepted: 01/14/2021] [Indexed: 12/24/2022] Open
Abstract
The germline carrier of the BRCA1 pathogenic mutation has been well proven to confer an increased risk of breast and ovarian cancer. Despite BRCA1 biallelic pathogenic mutations being extremely rare, they have been reported to be embryonically lethal or to cause Fanconi anemia (FA). Here we describe a patient who was a 48-year-old female identified with biallelic pathogenic mutations of the BRCA1 gene, with no or very subtle FA-features. She was diagnosed with ovarian cancer and breast cancer at the ages of 43 and 44 and had a strong family history of breast and gynecological cancers.
Collapse
|
12
|
Daly MB, Pal T, Berry MP, Buys SS, Dickson P, Domchek SM, Elkhanany A, Friedman S, Goggins M, Hutton ML, Karlan BY, Khan S, Klein C, Kohlmann W, Kurian AW, Laronga C, Litton JK, Mak JS, Menendez CS, Merajver SD, Norquist BS, Offit K, Pederson HJ, Reiser G, Senter-Jamieson L, Shannon KM, Shatsky R, Visvanathan K, Weitzel JN, Wick MJ, Wisinski KB, Yurgelun MB, Darlow SD, Dwyer MA. Genetic/Familial High-Risk Assessment: Breast, Ovarian, and Pancreatic, Version 2.2021, NCCN Clinical Practice Guidelines in Oncology. J Natl Compr Canc Netw 2021; 19:77-102. [DOI: 10.6004/jnccn.2021.0001] [Citation(s) in RCA: 211] [Impact Index Per Article: 70.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The NCCN Guidelines for Genetic/Familial High-Risk Assessment: Breast, Ovarian, and Pancreatic focus primarily on assessment of pathogenic or likely pathogenic variants associated with increased risk of breast, ovarian, and pancreatic cancer and recommended approaches to genetic testing/counseling and management strategies in individuals with these pathogenic or likely pathogenic variants. This manuscript focuses on cancer risk and risk management for BRCA-related breast/ovarian cancer syndrome and Li-Fraumeni syndrome. Carriers of a BRCA1/2 pathogenic or likely pathogenic variant have an excessive risk for both breast and ovarian cancer that warrants consideration of more intensive screening and preventive strategies. There is also evidence that risks of prostate cancer and pancreatic cancer are elevated in these carriers. Li-Fraumeni syndrome is a highly penetrant cancer syndrome associated with a high lifetime risk for cancer, including soft tissue sarcomas, osteosarcomas, premenopausal breast cancer, colon cancer, gastric cancer, adrenocortical carcinoma, and brain tumors.
Collapse
Affiliation(s)
| | - Tuya Pal
- 2Vanderbilt-Ingram Cancer Center
| | - Michael P. Berry
- 3St. Jude Children’s Research Hospital/The University of Tennessee Health Science Center
| | | | - Patricia Dickson
- 5Siteman Cancer Center at Barnes-Jewish Hospital and Washington University School of Medicine
| | | | | | | | - Michael Goggins
- 9The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
| | | | | | - Seema Khan
- 12Robert H. Lurie Comprehensive Cancer Center of Northwestern University
| | | | | | | | | | | | | | | | | | | | | | - Holly J. Pederson
- 22Case Comprehensive Cancer Center/University Hospitals Seidman Cancer Center and Cleveland Clinic Taussig Cancer Institute
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Krais JJ, Johnson N. Brca1 mutations in the coiled-coil domain impede Rad51 loading on DNA and mouse development. Mol Cell Oncol 2020; 7:1786345. [PMID: 32944641 PMCID: PMC7469674 DOI: 10.1080/23723556.2020.1786345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We recently developed a Brca1 coiled-coil mutant mouse model (Brca1CC). Brca1CC/CC results in embryonic lethality, with a fraction of mice reaching birth but with defects that parallel Fanconi anemia. Brca1CC/CC cells lacked Rad51 foci and were PARP inhibitor sensitive. Strikingly, inter-crossing with Brca1Δ11 generated Brca1CC/Δ11 mice that were developmentally normal.
Collapse
Affiliation(s)
- J J Krais
- Molecular Therapeutics Program, Fox Chase Cancer Center, Philadelphia, PA, USA
| | - N Johnson
- Molecular Therapeutics Program, Fox Chase Cancer Center, Philadelphia, PA, USA
| |
Collapse
|
14
|
Chirita-Emandi A, Andreescu N, Popa C, Mihailescu A, Riza AL, Plesea R, Ioana M, Arghirescu S, Puiu M. Biallelic variants in BRCA1 gene cause a recognisable phenotype within chromosomal instability syndromes reframed as BRCA1 deficiency. J Med Genet 2020; 58:648-652. [PMID: 32843487 PMCID: PMC8394758 DOI: 10.1136/jmedgenet-2020-107198] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 07/13/2020] [Accepted: 07/14/2020] [Indexed: 11/05/2022]
Abstract
Pathogenic variants in BRCA1 gene in heterozygous state are known to be associated with breast-ovarian cancer susceptibility; however, biallelic variants cause a phenotype recognised as Fanconi anaemia complementation group S. Due to its rarity, medical management and preventive screening measures are insufficiently understood. Here, we present nine individuals (one new and eight previously presented) with biallelic variants in BRCA1 gene, to delineate clinical features in comparison with other chromosome instability syndromes and understand the patients’ health risk. Features seen in these 9 individuals (7 females/2 males) include prenatal and postnatal growth failure (9/9), microcephaly (9/9), hypo/hyperpigmented lesions (9/9), facial dysmorphism (9/9), mild developmental delay (8/9) and early-onset solid tumours (5/9). None presented bone marrow failure or immunodeficiency. Individuals with biallelic variants in BRCA1 also showed chromosomal instability by mitomycin and diepoxybutane test. The phenotype caused by biallelic BRCA1 variants is best framed between Fanconi anaemia and Nijmegen syndrome, yet distinct due to lack of bone marrow failure and immunodeficiency. We hypothesise that disease class should be reframed and medical management in people with biallelic variants in BRCA1 should emphasise on detection of solid tumour development and avoiding exposure to ionising radiation.
Collapse
Affiliation(s)
- Adela Chirita-Emandi
- Department of Microscopic Morphology - Genetics, Center of Genomic Medicine, Victor Babes University of Medicine and Pharmacy Timisoara, Timisoara, Romania .,Regional Center of Medical Genetics Timis, Genetics, Emergency Hospital for Children Louis Turcanu Timisoara, Timisoara, Romania
| | - Nicoleta Andreescu
- Department of Microscopic Morphology - Genetics, Center of Genomic Medicine, Victor Babes University of Medicine and Pharmacy Timisoara, Timisoara, Romania.,Regional Center of Medical Genetics Timis, Genetics, Emergency Hospital for Children Louis Turcanu Timisoara, Timisoara, Romania
| | - Cristina Popa
- Department of Microscopic Morphology - Genetics, Center of Genomic Medicine, Victor Babes University of Medicine and Pharmacy Timisoara, Timisoara, Romania
| | - Alexandra Mihailescu
- Department of Microscopic Morphology - Genetics, Center of Genomic Medicine, Victor Babes University of Medicine and Pharmacy Timisoara, Timisoara, Romania
| | - Anca-Lelia Riza
- Human Genomics Laboratory, Genetics, University of Medicine and Pharmacy of Craiova, Craiova, Romania.,Regional Center of Medical Genetics Dolj, Emergency Clinical County Hospital Craiova, Craiova, Romania
| | - Razvan Plesea
- Human Genomics Laboratory, Genetics, University of Medicine and Pharmacy of Craiova, Craiova, Romania.,Regional Center of Medical Genetics Dolj, Emergency Clinical County Hospital Craiova, Craiova, Romania
| | - Mihai Ioana
- Human Genomics Laboratory, Genetics, University of Medicine and Pharmacy of Craiova, Craiova, Romania.,Regional Center of Medical Genetics Dolj, Emergency Clinical County Hospital Craiova, Craiova, Romania
| | - Smaranda Arghirescu
- Pediatric Department - Pediatric Discipline III, Victor Babes University of Medicine and Pharmacy Timisoara, Timisoara, Timis, Romania.,Onco-Hematology Department, Emergency Hospital for Children Louis Turcanu Timisoara, Timisoara, Timis, Romania
| | - Maria Puiu
- Department of Microscopic Morphology - Genetics, Center of Genomic Medicine, Victor Babes University of Medicine and Pharmacy Timisoara, Timisoara, Romania.,Regional Center of Medical Genetics Timis, Genetics, Emergency Hospital for Children Louis Turcanu Timisoara, Timisoara, Romania
| |
Collapse
|
15
|
BRCA1 Mutational Complementation Induces Synthetic Viability. Mol Cell 2020; 78:951-959.e6. [PMID: 32359443 PMCID: PMC7418109 DOI: 10.1016/j.molcel.2020.04.006] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 02/25/2020] [Accepted: 04/06/2020] [Indexed: 11/17/2022]
Abstract
BRCA1 promotes the DNA end resection and RAD51 loading steps of homologous recombination (HR). Whether these functions can be uncoupled, and whether mutant proteins retaining partial activity can complement one another, is unclear and could affect the severity of BRCA1-associated Fanconi anemia (FA). Here we generated a Brca1CC mouse with a coiled-coil (CC) domain deletion. Brca1CC/CC mice are born at low frequencies, and post-natal mice have FA-like abnormalities, including bone marrow failure. Intercrossing with Brca1Δ11, which is homozygous lethal, generated Brca1CC/Δ11 mice at Mendelian frequencies that were indistinguishable from Brca1+/+ mice. Brca1CC and Brca1Δ11 proteins were individually responsible for counteracting 53BP1-RIF1-Shieldin activity and promoting RAD51 loading, respectively. Thus, Brca1CC and Brca1Δ11 alleles represent separation-of-function mutations that combine to provide a level of HR sufficient for normal development and hematopoiesis. Because BRCA1 activities can be genetically separated, compound heterozygosity for functional complementary mutations may protect individuals from FA.
Collapse
|
16
|
Angeli D, Salvi S, Tedaldi G. Genetic Predisposition to Breast and Ovarian Cancers: How Many and Which Genes to Test? Int J Mol Sci 2020; 21:E1128. [PMID: 32046255 PMCID: PMC7038038 DOI: 10.3390/ijms21031128] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 02/03/2020] [Accepted: 02/05/2020] [Indexed: 12/19/2022] Open
Abstract
Breast and ovarian cancers are some of the most common tumors in females, and the genetic predisposition is emerging as one of the key risk factors in the development of these two malignancies. BRCA1 and BRCA2 are the best-known genes associated with hereditary breast and ovarian cancer. However, recent advances in molecular techniques, Next-Generation Sequencing in particular, have led to the identification of many new genes involved in the predisposition to breast and/or ovarian cancer, with different penetrance estimates. TP53, PTEN, STK11, and CDH1 have been identified as high penetrance genes for the risk of breast/ovarian cancers. Besides them, PALB2, BRIP1, ATM, CHEK2, BARD1, NBN, NF1, RAD51C, RAD51D and mismatch repair genes have been recognized as moderate and low penetrance genes, along with other genes encoding proteins involved in the same pathways, possibly associated with breast/ovarian cancer risk. In this review, we summarize the past and more recent findings in the field of cancer predisposition genes, with insights into the role of the encoded proteins and the associated genetic disorders. Furthermore, we discuss the possible clinical utility of genetic testing in terms of prevention protocols and therapeutic approaches.
Collapse
Affiliation(s)
- Davide Angeli
- Biostatistics and Clinical Trials Unit, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) IRCCS, 47014 Meldola, Italy;
| | - Samanta Salvi
- Biosciences Laboratory, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) IRCCS, 47014 Meldola, Italy;
| | - Gianluca Tedaldi
- Biosciences Laboratory, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) IRCCS, 47014 Meldola, Italy;
| |
Collapse
|
17
|
Keupp K, Hampp S, Hübbel A, Maringa M, Kostezka S, Rhiem K, Waha A, Wappenschmidt B, Pujol R, Surrallés J, Schmutzler RK, Wiesmüller L, Hahnen E. Biallelic germline BRCA1 mutations in a patient with early onset breast cancer, mild Fanconi anemia-like phenotype, and no chromosome fragility. Mol Genet Genomic Med 2019; 7:e863. [PMID: 31347298 PMCID: PMC6732317 DOI: 10.1002/mgg3.863] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 07/05/2019] [Indexed: 12/22/2022] Open
Abstract
Background Biallelic BRCA1 mutations are regarded either embryonically lethal or to cause Fanconi anemia (FA), a genomic instability syndrome characterized by bone marrow failure, developmental abnormalities, and cancer predisposition. We report biallelic BRCA1 mutations c.181T > G (p.Cys61Gly) and c.5096G > A (p.Arg1699Gln) in a woman with breast cancer diagnosed at the age of 30 years. The common European founder mutation p.Cys61Gly confers high cancer risk, whereas the deleterious p.Arg1699Gln is hypomorphic and was suggested to confer intermediate cancer risk. Methods and Results Aside from significant toxicity from chemotherapy, the patient showed mild FA‐like features (e.g., short stature, microcephaly, skin hyperpigmentation). Chromosome fragility, a hallmark of FA patient cells, was not present in patient‐derived peripheral blood lymphocytes. We demonstrated that the p.Arg1699Gln mutation impairs DNA double‐strand break repair, elevates RAD51 foci levels at baseline, and compromises BRCA1 protein function in protecting from replication stress. Although the p.Arg1699Gln mutation compromises BRCA1 function, the residual activity of the p.Arg1699Gln allele likely prevents from chromosome fragility and a more severe FA phenotype. Conclusion Our data expand the clinical spectrum associated with biallelic BRCA1 mutations, ranging from embryonic lethality to a mild FA‐like phenotype and no chromosome fragility.
Collapse
Affiliation(s)
- Katharina Keupp
- Center for Familial Breast and Ovarian Cancer, Center for Integrated Oncology (CIO), University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany, University Hospital of Cologne, Cologne, Germany
| | - Stephanie Hampp
- Department of Obstetrics and Gynecology, Ulm University, Ulm, Germany
| | - Annette Hübbel
- Center for Familial Breast and Ovarian Cancer, Center for Integrated Oncology (CIO), University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany, University Hospital of Cologne, Cologne, Germany
| | - Monika Maringa
- Center for Familial Breast and Ovarian Cancer, Center for Integrated Oncology (CIO), University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany, University Hospital of Cologne, Cologne, Germany
| | - Sarah Kostezka
- Department of Obstetrics and Gynecology, Ulm University, Ulm, Germany
| | - Kerstin Rhiem
- Center for Familial Breast and Ovarian Cancer, Center for Integrated Oncology (CIO), University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany, University Hospital of Cologne, Cologne, Germany
| | - Anke Waha
- Center for Familial Breast and Ovarian Cancer, Center for Integrated Oncology (CIO), University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany, University Hospital of Cologne, Cologne, Germany
| | - Barbara Wappenschmidt
- Center for Familial Breast and Ovarian Cancer, Center for Integrated Oncology (CIO), University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany, University Hospital of Cologne, Cologne, Germany
| | - Roser Pujol
- Department of Genetics and Biomedical Research Institute, Hospital de Sant Pau, Barcelona, Spain.,Department of Genetics and Microbiology, Universitat Autònoma de Barcelona, Barcelona, Spain.,Center for Biomedical Network Research on Rare Diseases, Barcelona, Spain
| | - Jordi Surrallés
- Department of Genetics and Biomedical Research Institute, Hospital de Sant Pau, Barcelona, Spain.,Department of Genetics and Microbiology, Universitat Autònoma de Barcelona, Barcelona, Spain.,Center for Biomedical Network Research on Rare Diseases, Barcelona, Spain
| | - Rita K Schmutzler
- Center for Familial Breast and Ovarian Cancer, Center for Integrated Oncology (CIO), University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany, University Hospital of Cologne, Cologne, Germany
| | - Lisa Wiesmüller
- Department of Obstetrics and Gynecology, Ulm University, Ulm, Germany
| | - Eric Hahnen
- Center for Familial Breast and Ovarian Cancer, Center for Integrated Oncology (CIO), University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany, University Hospital of Cologne, Cologne, Germany
| |
Collapse
|