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Keske A, Weisman P, Ospina-Romero M, Raut P, Smith-Simmer K, Zakas AL, Flynn C, Xu J. Breast cancers in monoallelic MUTYH germline mutation carriers have clinicopathological features overlapping with those in BRCA1 germline mutation carriers. Breast Cancer Res Treat 2024; 204:151-158. [PMID: 38062336 DOI: 10.1007/s10549-023-07173-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 11/02/2023] [Indexed: 01/24/2024]
Abstract
PURPOSE Breast cancer patients referred to genetic counseling often undergo genetic testing with broad panels that include both breast cancer susceptibility genes as well as genes more specific for extramammary sites. As a result, patients are often incidentally found to have germline mutations in genes that are not necessarily related to breast cancer risk. One such gene is MUTYH. To understand the role MUTYH may play in breast cancer, the clinicopathological features of patients with monoallelic MUTYH germline mutation and breast cancer were examined. METHODS The clinicopathological characteristics of the breast cancers from patients with monoallelic MUTYH mutation were compared to breast cancer patients with other germline mutations in known breast cancer susceptibility genes, including ATM, BRCA1/2, CHEK2, and PALB2. The breast cancer patients who received genetic counseling but tested negative for the aforementioned gene mutations were used as a control group. RESULTS Histologic characteristics of the breast cancers arising in monoallelic MUTYH mutation carriers had significantly larger tumor size, higher tumor grade, and more high-risk biomarker profiles (i.e., Her2-positive and triple-negative) than breast cancer patients with susceptibility genes, except for BRCA1. MUTYH mutation carriers also showed a trend of more frequent intratumoral divergency in terms of tumor grade and biomarker profiles. CONCLUSION Although germline monoallelic MUTYH mutation is not thought to confer a meaningfully increased risk of breast cancer development, it may contribute to pathological aggressiveness and diversity of breast cancers when they sporadically arise in MUTYH carriers.
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Affiliation(s)
- Aysenur Keske
- Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.
| | - Paul Weisman
- Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Monica Ospina-Romero
- Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Prachi Raut
- Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Kelcy Smith-Simmer
- Master of Genetic Counselor Studies, Academic Affairs, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- Oncology Genetics, University of Wisconsin Carbone Cancer Center, UW Health, Madison, WI, USA
| | - Anna L Zakas
- Master of Genetic Counselor Studies, Academic Affairs, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- Oncology Genetics, University of Wisconsin Carbone Cancer Center, UW Health, Madison, WI, USA
| | - Christopher Flynn
- Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Jin Xu
- Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
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Liu Y, Zheng J, Xu Y, Lv J, Wu Z, Feng K, Liu J, Yan W, Wei L, Zhao J, Jiang L, Han M. Multigene testing panels reveal pathogenic variants in sporadic breast cancer patients in northern China. Front Genet 2023; 14:1271710. [PMID: 38028594 PMCID: PMC10666181 DOI: 10.3389/fgene.2023.1271710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 10/16/2023] [Indexed: 12/01/2023] Open
Abstract
Background: Breast cancer, the most prevalent malignancy in women worldwide, presents diverse onset patterns and genetic backgrounds. This study aims to examine the genetic landscape and clinical implications of rare mutations in Chinese breast cancer patients. Methods: Clinical data from 253 patients, including sporadic and familial cases, were analyzed. Comprehensive genomic profiling was performed, categorizing identified rare variants according to the American College of Medical Genetics (ACMG) guidelines. In silico protein modeling was used to analyze potentially pathogenic variants' impact on protein structure and function. Results: We detected 421 rare variants across patients. The most frequently mutated genes were ALK (22.2%), BARD1 (15.6%), and BRCA2 (15.0%). ACMG classification identified 7% of patients harboring Pathogenic/Likely Pathogenic (P/LP) variants, with one case displaying a pathogenic BRCA1 mutation linked to triple-negative breast cancer (TNBC). Also identified were two pathogenic MUTYH variants, previously associated with colon cancer but increasingly implicated in breast cancer. Variants of uncertain significance (VUS) were identified in 112 patients, with PTEN c.C804A showing the highest frequency. The role of these variants in sporadic breast cancer oncogenesis was suggested. In-depth exploration of previously unreported variants led to the identification of three potential pathogenic variants: ATM c.C8573T, MSH3 c.A2723T, and CDKN1C c.C221T. Their predicted impact on protein structure and stability suggests a functional role in cancer development. Conclusion: This study reveals a comprehensive overview of the genetic variants landscape in Chinese breast cancer patients, highlighting the prevalence and potential implications of rare variants. We emphasize the value of comprehensive genomic profiling in breast cancer management and the necessity of continuous research into understanding the functional impacts of these variants.
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Affiliation(s)
- Yinfeng Liu
- Breast Disease Diagnosis and Treatment Center, The First Hospital of Qinhuangdao, Qinhuangdao, Hebei, China
| | - Jie Zheng
- Breast Disease Diagnosis and Treatment Center, The First Hospital of Qinhuangdao, Qinhuangdao, Hebei, China
| | - Yue Xu
- Shanghai Biotecan Pharmaceuticals Co., Ltd., Shanghai, China
| | - Ji Lv
- Breast Disease Diagnosis and Treatment Center, The First Hospital of Qinhuangdao, Qinhuangdao, Hebei, China
| | - Zizheng Wu
- Breast Disease Diagnosis and Treatment Center, The First Hospital of Qinhuangdao, Qinhuangdao, Hebei, China
| | - Kai Feng
- Breast Disease Diagnosis and Treatment Center, The First Hospital of Qinhuangdao, Qinhuangdao, Hebei, China
| | - Jiani Liu
- Breast Disease Diagnosis and Treatment Center, The First Hospital of Qinhuangdao, Qinhuangdao, Hebei, China
| | - Weitao Yan
- Breast Disease Diagnosis and Treatment Center, The First Hospital of Qinhuangdao, Qinhuangdao, Hebei, China
| | - Liguang Wei
- Breast Disease Diagnosis and Treatment Center, The First Hospital of Qinhuangdao, Qinhuangdao, Hebei, China
| | - Jiangman Zhao
- Shanghai Biotecan Pharmaceuticals Co., Ltd., Shanghai, China
| | - Lisha Jiang
- Shanghai Biotecan Pharmaceuticals Co., Ltd., Shanghai, China
| | - Meng Han
- Breast Disease Diagnosis and Treatment Center, The First Hospital of Qinhuangdao, Qinhuangdao, Hebei, China
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Al Saati A, Vande Perre P, Plenecassagnes J, Gilhodes J, Monselet N, Cabarrou B, Lignon N, Filleron T, Telly D, Perello-Lestrade E, Feillel V, Staub A, Martinez M, Chipoulet E, Collet G, Thomas F, Gladieff L, Toulas C. Multigene Panel Sequencing Identifies a Novel Germline Mutation Profile in Male Breast Cancer Patients. Int J Mol Sci 2023; 24:14348. [PMID: 37762649 PMCID: PMC10531866 DOI: 10.3390/ijms241814348] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/07/2023] [Accepted: 09/11/2023] [Indexed: 09/29/2023] Open
Abstract
Even though male breast cancer (MBC) risk encompasses both genetic and environmental aetiologies, the primary risk factor is a germline pathogenic variant (PV) or likely pathogenic variant (LPV) in BRCA2, BRCA1 and/or PALB2 genes. To identify new potential MBC-specific predisposition genes, we sequenced a panel of 585 carcinogenesis genes in an MBC cohort without BRCA1/BRCA2/PALB2 PV/LPV. We identified 14 genes carrying rare PVs/LPVs in the MBC population versus noncancer non-Finnish European men, predominantly coding for DNA repair and maintenance of genomic stability proteins. We identified for the first time PVs/LPVs in PRCC (pre-mRNA processing), HOXA9 (transcription regulation), RECQL4 and WRN (maintenance of genomic stability) as well as in genes involved in other cellular processes. To study the specificity of this MBC PV/LPV profile, we examined whether variants in the same genes could be detected in a female breast cancer (FBC) cohort without BRCA1/BRCA2/PALB2 PV/LPV. Only 5/109 women (4.6%) carried a PV/LPV versus 18/85 men (21.2%) on these genes. FBC did not carry any PV/LPV on 11 of these genes. Although 5.9% of the MBC cohort carried PVs/LPVs in PALLD and ERCC2, neither of these genes were altered in our FBC cohort. Our data suggest that in addition to BRCA1/BRCA2/PALB2, other genes involved in DNA repair/maintenance or genomic stability as well as cell adhesion may form a specific MBC PV/LPV signature.
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Affiliation(s)
- Ayman Al Saati
- Oncogenetics Laboratory, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (A.A.S.); (D.T.); (E.P.-L.)
- DIAD, Inserm, Centre de Recherches en Cancérologie de Toulouse, Toulouse, France;
- Université de Toulouse, Université Toulouse III-Paul Sabatier, Toulouse, France
| | - Pierre Vande Perre
- Oncogenetics Laboratory, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (A.A.S.); (D.T.); (E.P.-L.)
- DIAD, Inserm, Centre de Recherches en Cancérologie de Toulouse, Toulouse, France;
| | - Julien Plenecassagnes
- Bioinformatics Department, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France;
| | - Julia Gilhodes
- Biostatistics Department, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (J.G.); (N.M.); (B.C.); (T.F.)
| | - Nils Monselet
- Biostatistics Department, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (J.G.); (N.M.); (B.C.); (T.F.)
| | - Bastien Cabarrou
- Biostatistics Department, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (J.G.); (N.M.); (B.C.); (T.F.)
| | - Norbert Lignon
- Oncogenetics Department, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (N.L.); (V.F.); (A.S.); (E.C.); (G.C.); (L.G.)
| | - Thomas Filleron
- Biostatistics Department, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (J.G.); (N.M.); (B.C.); (T.F.)
| | - Dominique Telly
- Oncogenetics Laboratory, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (A.A.S.); (D.T.); (E.P.-L.)
| | - Emilie Perello-Lestrade
- Oncogenetics Laboratory, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (A.A.S.); (D.T.); (E.P.-L.)
| | - Viviane Feillel
- Oncogenetics Department, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (N.L.); (V.F.); (A.S.); (E.C.); (G.C.); (L.G.)
| | - Anne Staub
- Oncogenetics Department, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (N.L.); (V.F.); (A.S.); (E.C.); (G.C.); (L.G.)
| | | | - Edith Chipoulet
- Oncogenetics Department, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (N.L.); (V.F.); (A.S.); (E.C.); (G.C.); (L.G.)
| | - Gaëlle Collet
- Oncogenetics Department, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (N.L.); (V.F.); (A.S.); (E.C.); (G.C.); (L.G.)
| | - Fabienne Thomas
- DIAD, Inserm, Centre de Recherches en Cancérologie de Toulouse, Toulouse, France;
- Université de Toulouse, Université Toulouse III-Paul Sabatier, Toulouse, France
- Pharmacology Department, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France
| | - Laurence Gladieff
- Oncogenetics Department, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (N.L.); (V.F.); (A.S.); (E.C.); (G.C.); (L.G.)
| | - Christine Toulas
- Oncogenetics Laboratory, Oncopole Claudius Regaud, IUCT-Oncopole, Toulouse, France; (A.A.S.); (D.T.); (E.P.-L.)
- DIAD, Inserm, Centre de Recherches en Cancérologie de Toulouse, Toulouse, France;
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Vázquez-Romo R, Millan-Catalan O, Ruíz-García E, Martínez-Gutiérrez AD, Alvarado-Miranda A, Campos-Parra AD, López-Camarillo C, Jacobo-Herrera N, López-Urrutia E, Guardado-Estrada M, Cantú de León D, Pérez-Plasencia C. Pathogenic variant profile in DNA damage response genes correlates with metastatic breast cancer progression-free survival in a Mexican-mestizo population. Front Oncol 2023; 13:1146008. [PMID: 37182128 PMCID: PMC10174330 DOI: 10.3389/fonc.2023.1146008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 04/14/2023] [Indexed: 05/16/2023] Open
Abstract
Introduction Metastatic breast cancer causes the most breast cancer-related deaths around the world, especially in countries where breast cancer is detected late into its development. Genetic testing for cancer susceptibility started with the BRCA 1 and 2 genes. Still, recent research has shown that variations in other members of the DNA damage response (DDR) are also associated with elevated cancer risk, opening new opportunities for enhanced genetic testing strategies. Methods We sequenced BRCA1/2 and twelve other DDR genes from a Mexican-mestizo population of 40 metastatic breast cancer patients through semiconductor sequencing. Results Overall, we found 22 variants -9 of them reported for the first time- and a strikingly high proportion of variations in ARID1A. The presence of at least one variant in the ARID1A, BRCA1, BRCA2, or FANCA genes was associated with worse progression-free survival and overall survival in our patient cohort. Discussion Our results reflected the unique characteristics of the Mexican-mestizo population as the proportion of variants we found differed from that of other global populations. Based on these findings, we suggest routine screening for variants in ARID1A along with BRCA1/2 in breast cancer patients from the Mexican-mestizo population.
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Affiliation(s)
- Rafael Vázquez-Romo
- Departamento de Cirugía de Tumores Mamarios, Instituto Nacional de Cancerología (INCan), Ciudad de México, Mexico
| | - Oliver Millan-Catalan
- Laboratorio de Genómica, Instituto Nacional de Cancerología (INCan), Ciudad de México, Mexico
| | - Erika Ruíz-García
- Laboratorio de Medicina Traslacional y Departamento de Tumores Gastrointestinales, Instituto Nacional de Cancerología, CDMX, Mexico
| | | | - Alberto Alvarado-Miranda
- Departamento de Cirugía de Tumores Mamarios, Instituto Nacional de Cancerología (INCan), Ciudad de México, Mexico
| | - Alma D. Campos-Parra
- Dirección de Investigación, Instituto Nacional de Cancerología (INCan), Ciudad de México, Mexico
| | - César López-Camarillo
- Posgrado en Ciencias Genómicas, Universidad Autónoma de la Ciudad de México, Ciudad de México, Mexico
| | - Nadia Jacobo-Herrera
- Unidad de Bioquímica, Instituto Nacional de Ciencias Médicas y Nutrición, Salvador Zubirán (INCMNSZ), Ciudad de México, Mexico
| | - Eduardo López-Urrutia
- Laboratorio de Genómica, Unidad de Biomedicina, FES-IZTACALA, UNAM, Tlalnepantla, Mexico
| | - Mariano Guardado-Estrada
- Laboratorio de Genética, Ciencia Forense, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - David Cantú de León
- Dirección de Investigación, Instituto Nacional de Cancerología (INCan), Ciudad de México, Mexico
- *Correspondence: David Cantú de León, ; Carlos Pérez-Plasencia,
| | - Carlos Pérez-Plasencia
- Laboratorio de Genómica, Instituto Nacional de Cancerología (INCan), Ciudad de México, Mexico
- Laboratorio de Genómica, Unidad de Biomedicina, FES-IZTACALA, UNAM, Tlalnepantla, Mexico
- *Correspondence: David Cantú de León, ; Carlos Pérez-Plasencia,
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Nassar A, Zekri ARN, Kamel MM, Elberry MH, Lotfy MM, Seadawy MG, Hassan ZK, Soliman HK, Lymona AM, Youssef ASED. Frequency of Pathogenic Germline Mutations in Early and Late Onset Familial Breast Cancer Patients Using Multi-Gene Panel Sequencing: An Egyptian Study. Genes (Basel) 2022; 14:106. [PMID: 36672847 PMCID: PMC9858960 DOI: 10.3390/genes14010106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 11/23/2022] [Accepted: 12/08/2022] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Precision oncology has been increasingly used in clinical practice and rapidly evolving in the oncology field. Thus, this study was performed to assess the frequency of germline mutations in early and late onset familial breast cancer (BC) Egyptian patients using multi-gene panel sequencing to better understand the contribution of the inherited germline mutations in BC predisposition. Moreover, to determine the actionable deleterious mutations associated with familial BC that might be used as biomarker for early cancer detection. METHODS Whole blood samples were collected from 101 Egyptian patients selected for BC family history, in addition to 50 age-matched healthy controls. A QIAseq targeted DNA panel (human BC panel) was used to assess the frequency of germline mutations. RESULTS A total of 58 patients (57.4%) out of 101 were found to have 27 deleterious germline mutations in 11 cancer susceptibility genes. Of them, 32 (31.6%) patients carried more than one pathogenic mutation and each one carried at least one pathogenic mutation. The major genes harboring the pathogenic mutations were: ATM, BRCA2, BRCA1, VHL, MSH6, APC, CHEK2, MSH2, MEN1, PALB2, and MUTYH. Thirty-one patients (30.6%) had BRCA2 mutations and twenty (19.8%) had BRCA1 mutations. Our results showed that exon 10 and exon 11 harbored 3 and 5 mutations, respectively, in BRCA1 and BRCA2 genes. Our analysis also revealed that the VHL gene significantly co-occurred with each of the BRCA2 gene (p = 0.003, event ratio 11/21), the MSH2 gene (p = 0.01, 4/10), the CHEK2 gene (p = 0.02, 4/11), and the MSH6 gene (p = 0.04, 4/12). In addition, the APC gene significantly co-occurred with the MSH2 gene (p = 0.01, 3/7). Furthermore, there was a significant mutually exclusive event between the APC gene and the ATM gene (p = 0.04, 1/36). Interestingly, we identified population specific germline mutations in genes showing potentials for targeted therapy to meet the need for incorporating precision oncology into clinical practice. For example, the mutations identified in the ATM, APC, and MSH2 genes. CONCLUSIONS Multi-gene panel sequencing was used to detect the deleterious mutations associated with familial BC, which in turns mitigate the essential need for implementing next generation sequencing technologies in precision oncology to identify cancer predisposing genes. Moreover, identifying DNA repair gene mutations, with focus on non-BRCA genes, might serve as candidates for targeted therapy and will be increasingly used in precision oncology.
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Affiliation(s)
- Auhood Nassar
- Virology and Immunology Unit, Cancer Biology Department, National Cancer Institute, Cairo University, Cairo 11976, Egypt
| | - Abdel-Rahman N. Zekri
- Virology and Immunology Unit, Cancer Biology Department, National Cancer Institute, Cairo University, Cairo 11976, Egypt
| | - Mahmoud M. Kamel
- Clinical Pathology Department, National Cancer Institute, Cairo University, Cairo 11976, Egypt
- Baheya Centre for Early Detection and Treatment of Breast Cancer, Giza 3546211, Egypt
| | - Mostafa H. Elberry
- Virology and Immunology Unit, Cancer Biology Department, National Cancer Institute, Cairo University, Cairo 11976, Egypt
| | - Mai M. Lotfy
- Virology and Immunology Unit, Cancer Biology Department, National Cancer Institute, Cairo University, Cairo 11976, Egypt
| | - Mohamed G. Seadawy
- Biological Prevention Department, Chemical Warfare, 4.5 km Suez-Cairo Rd, Almaza, Cairo 11351, Egypt
| | - Zeinab K. Hassan
- Virology and Immunology Unit, Cancer Biology Department, National Cancer Institute, Cairo University, Cairo 11976, Egypt
| | - Hany K. Soliman
- Virology and Immunology Unit, Cancer Biology Department, National Cancer Institute, Cairo University, Cairo 11976, Egypt
| | - Ahmed M. Lymona
- Surgical Oncology Department, National Cancer Institute, Cairo University, Cairo 11976, Egypt
| | - Amira Salah El-Din Youssef
- Virology and Immunology Unit, Cancer Biology Department, National Cancer Institute, Cairo University, Cairo 11976, Egypt
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G R, Mitra A, Pk V. Predicting functional riboSNitches in the context of alternative splicing. Gene X 2022; 837:146694. [PMID: 35738445 DOI: 10.1016/j.gene.2022.146694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 05/11/2022] [Accepted: 06/17/2022] [Indexed: 11/19/2022] Open
Abstract
RNAs are the major regulators of gene expression, and their secondary structures play crucial roles at different levels. RiboSNitches are disease-associated SNPs that cause changes in the pre-mRNA secondary structural ensemble. Several riboSNitches have been detected in the 5' and 3' untranslated regions and lncRNA. Although cases of secondary structural elements playing a regulatory role in alternative splicing are known, regions specific to splicing events, such as splice junctions have not received much attention. We tested splice-site mutations for their efficiency in disrupting the secondary structure and hypothesized that these could play a crucial role in alternative splicing. Multiple riboSNitch prediction methods were applied to obtain overlapping results that are potentially more reliable. Putative riboSNitches were identified from aberrant 5' and 3' splice site mutations, cancer-causing somatic mutations, and genes that harbor the regulatory RNA secondary structural elements. Our workflow for predicting riboSNitches associated with alternative splicing is novel and paves the way for subsequent experimental validation.
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Affiliation(s)
- Ramya G
- Center for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Gachibowli, Hyderabad, Telangana 500032, India.
| | - Abhijit Mitra
- Center for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Gachibowli, Hyderabad, Telangana 500032, India.
| | - Vinod Pk
- Center for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Gachibowli, Hyderabad, Telangana 500032, India.
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Franchet C, Hoffmann JS, Dalenc F. Recent Advances in Enhancing the Therapeutic Index of PARP Inhibitors in Breast Cancer. Cancers (Basel) 2021; 13:cancers13164132. [PMID: 34439286 PMCID: PMC8392832 DOI: 10.3390/cancers13164132] [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: 07/02/2021] [Revised: 08/10/2021] [Accepted: 08/11/2021] [Indexed: 12/27/2022] Open
Abstract
Simple Summary Two to three percent of breast cancer patients harbor germline mutation of either BRCA1 or BRCA2 genes. Their tumor cells are deficient in homologous recombination, a BRCA-dependent DNA repair machinery. These deficient cells survive thanks to the PARP-mediated alternative pathway. Therefore, PARP inhibitors have already shown some level of efficiency in the treatment of metastatic breast cancer patients. Unfortunately, some tumor cells inevitably resist PARP inhibitors by different mechanisms. In this review, we (i) present the notion of homologous recombination deficiency and its evaluation methods, (ii) detail the PARP inhibitor clinical trials in breast cancer, (iii) briefly describe the mechanisms to PARP inhibitors resistance, and (iv) discuss some strategies currently under evaluation to enhance the therapeutic index of PARP inhibitors in breast cancer. Abstract As poly-(ADP)-ribose polymerase (PARP) inhibition is synthetic lethal with the deficiency of DNA double-strand (DSB) break repair by homologous recombination (HR), PARP inhibitors (PARPi) are currently used to treat breast cancers with mutated BRCA1/2 HR factors. Unfortunately, the increasingly high rate of PARPi resistance in clinical practice has dented initial hopes. Multiple resistance mechanisms and acquired vulnerabilities revealed in vitro might explain this setback. We describe the mechanisms and vulnerabilities involved, including newly identified modes of regulation of DSB repair that are now being tested in large cohorts of patients and discuss how they could lead to novel treatment strategies to improve the therapeutic index of PARPi.
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Affiliation(s)
- Camille Franchet
- Laboratoire de Pathologie and Institut Claudius Regaud, Institut Universitaire du Cancer de Toulouse-Oncopole, 1 Av. Irène Joliot-Curie, 31100 Toulouse, France;
| | - Jean-Sébastien Hoffmann
- Laboratoire d’Excellence Toulouse Cancer (TOUCAN), Laboratoire de Pathologie, Institut Universitaire du Cancer-Toulouse, 31037 Toulouse, France;
| | - Florence Dalenc
- Institut Claudius Regaud, Institut Universitaire du Cancer de Toulouse-Oncopole, 1 Av. Irène Joliot-Curie, 31100 Toulouse, France
- Correspondence:
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