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Clinical, splicing, and functional analysis to classify BRCA2 exon 3 variants: Application of a points-based ACMG/AMP approach

M. Thomassen, RLS. Mesman, TVO. Hansen, M. Menendez, M. Rossing, A. Esteban-Sánchez, E. Tudini, T. Törngren, MT. Parsons, IS. Pedersen, SH. Teo, TA. Kruse, P. Møller, Å. Borg, UB. Jensen, LL. Christensen, CF. Singer, D. Muhr, M. Santamarina, R....

. 2022 ; 43 (12) : 1921-1944. [pub] 20221023

Jazyk angličtina Země Spojené státy americké

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/bmc22032466

Skipping of BRCA2 exon 3 (∆E3) is a naturally occurring splicing event, complicating clinical classification of variants that may alter ∆E3 expression. This study used multiple evidence types to assess pathogenicity of 85 variants in/near BRCA2 exon 3. Bioinformatically predicted spliceogenic variants underwent mRNA splicing analysis using minigenes and/or patient samples. ∆E3 was measured using quantitative analysis. A mouse embryonic stem cell (mESC) based assay was used to determine the impact of 18 variants on mRNA splicing and protein function. For each variant, population frequency, bioinformatic predictions, clinical data, and existing mRNA splicing and functional results were collated. Variant class was assigned using a gene-specific adaptation of ACMG/AMP guidelines, following a recently proposed points-based system. mRNA and mESC analysis combined identified six variants with transcript and/or functional profiles interpreted as loss of function. Cryptic splice site use for acceptor site variants generated a transcript encoding a shorter protein that retains activity. Overall, 69/85 (81%) variants were classified using the points-based approach. Our analysis shows the value of applying gene-specific ACMG/AMP guidelines using a points-based approach and highlights the consideration of cryptic splice site usage to appropriately assign PVS1 code strength.

Ambry Genetics Aliso Viejo California USA

Breast Cancer Research Programme Cancer Research Malaysia Subang Jaya Selangor Malaysia

Center for Familial Breast and Ovarian Cancer Faculty of Medicine and University Hospital Cologne University of Cologne Cologne Germany

Center for Genomic Medicine Rigshospitalet Copenhagen University Hospital Copenhagen Denmark

Center for Integrated Oncology Faculty of Medicine and University Hospital Cologne University of Cologne Cologne Germany

Centre for Medical Genetics Ghent University Gent Belgium

Centro de Investigación en Red de Enfermedades Raras Madrid Spain

Clinical Cancer Research Center Aalborg University Hospital Aalborg Denmark

Department of Biochemistry and Molecular Biology and the Villum Center for Bioanalytical Sciences University of Southern Denmark Odense Denmark

Department of Cancer Epidemiology and Genetics Masaryk Memorial Cancer Institute Brno Czech Republic

Department of Clinical Genetics Aarhus University Hospital Aarhus N Denmark

Department of Clinical Genetics Maastricht University Medical Center Maastricht the Netherlands

Department of Clinical Genetics Odense University Hospital Odence C Denmark

Department of Clinical Genetics Rigshospitalet Copenhagen University Hospital Copenhagen Denmark

Department of Clinical Medicine Aalborg University Aalborg Denmark

Department of Dermatology Huntsman Cancer Institute University of Utah School of Medicine Salt Lake City Utah USA

Department of Genetics and Computational Biology QIMR Berghofer Medical Research Institute Brisbane Queensland Australia

Department of Human Genetics Leiden University Medical Center Leiden the Netherlands

Department of Molecular Medicine Aarhus University Hospital Aarhus Denmark

Department of OB GYN and Comprehensive Cancer Center Medical University of Vienna Vienna Austria

Department of Pathology and Biomedical Science University of Otago Christchurch New Zealand

Department of Surgery Faculty of Medicine University of Malaya Kuala Lumpur Malaysia

Department of Tumour Biology The Norwegian Radium Hospital Oslo University Hospital Oslo Norway

Division of Functional Onco genomics and Genetics Centro di Riferimento Oncologico di Aviano IRCCS Aviano Italy

Division of Oncology Department of Clinical Sciences Lund Lund University Lund Sweden

Fundación Pública Galega de Medicina Xenómica Santiago de Compostela Spain

Hereditary Cancer Clinic Nelune Comprehensive Cancer Care Centre Sydney New South Wales Australia

Hereditary Cancer Program Catalan Institute of Oncology ONCOBELL IDIBELL IDTP CIBERONC Hospitalet de Llobregat Spain

Human Development and Health Faculty of Medicine University of Southampton Southampton UK

Institute for Medical Informatics Statistics and Epidemiology University of Leipzig Leipzig Germany

Instituto de Investigación Sanitaria de Santiago de Compostela Complejo Hospitalario Universitario de Santiago SERGAS Santiago de Compostela Spain

Middlesex Health Shoreline Cancer Center Westbrook Connecticut USA

Molecular Diagnostics Aalborg University Hospital Aalborg Denmark

Molecular Oncology Laboratory CIBERONC Hospital Clinico San Carlos IdISSC Madrid Spain

Parkville Familial Cancer Centre Peter MacCallum Cancer Center Melbourne Victoria Australia

Sir Peter MacCallum Department of Oncology The University of Melbourne Melbourne Victoria Australia

Unit of Molecular Bases of Genetic Risk and Genetic Testing Department of Research Fondazione IRCCS Istituto Nazionale dei Tumori Milan Italy

Citace poskytuje Crossref.org

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