The Genetics and Prevention of Sudden Cardiac Death
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1 The Genetics and Prevention of Sudden Cardiac Death
2 Sudden cardiac death (SCD), a serious public health problem Every day, between 1,600 and 2,000 people die worldwide from genetically caused SCD. 1 SCD is a complex disease. Its pathogenesis involves different genetic variants. 2 Some heart diseases, particularly cardiomyopathies and channelopathies, play a fundamental role in SCD. 3 SCD can be prevented The identification of at-risk patients helps to prevent a fatal outcome. 4
3 Genetics, key for a comprehensive diagnosis Comprehensive diagnosis Clinical diagnosis Molecular diagnosis Based on signs and symptoms. It can be determined before the disease is expressed. Medical record Electrocardiogram Echocardiography Magnetic resonance imaging Pharmacological tests Electrophysiological studies Genetics KCNE1, KCNE2, KCNH2, KCNJ2, KCNQ1,KCND3, KCNE3, KCNE1L (KCNE5), KCNJ5, KCNJ8, KCNA5, KCNE4 CACNA1C, CACNB2, CACNA2D1, CACNA1G, CACNA1H, CACNA1I subunit α 2 Extracellular matrix Protein complex associated with dystrophin Laminin a LAMA4 Desmosome DSP, DSG2, DSC2, JUP, PKP2 K ir 2.1 mink / Ks K v 7.1 subunit α / K1 / Kr K v 11.1 K + SR K + K + CASQ2 Ca 2+ PLN SERCA2a Ca 2+ Ca 2+ subunit β Ca y 1.2 / Cal / HCN4 f Na + RyR2 Na + Na y 1.5 Genes involved in channelopathies. Adapted from text ref. 5. K + / Na subunit γ subunit δ subunit α 2 Cell membrane subunit β Caveolin 3 Syntrophin α 1 Cytoskeleton Cytosol SCN4B, SCN5A, SCN1B, SCN2B, SCN3B Sarcomere ACTC1, MYBPC3, MYH6, MYH7, MYL2, MYL3, TNNC1, TNNI3, TNNT2, TPM1, TTN EMD Nucleus LMNA Z disk a b CRYAB Sarcoplasmic reticulum Cytoplasm Genes involved in cardiomyopathies. Adapted from text ref. 3. b CAV3 CASQ2, PLN, RYR2 BAG3, CSRP3, FHL2, LDB3, MYOZ2, NEBL, NEXN, TCAP, VCL Nuclear membrane TMPO DES
4 SudD incode development process Selection of the genes that make up our panels is based on the following criteria: Recommended in guidelines and consensuses Genes Less common genes, but with demonstrated causality Highly suspect in disease causation Causality of phenotype subtypes When a diagnosis is unclear, Ferrer incode recommends the analysis of a broad gene panel that contains all phenotypes. When there is a specific clinical suspicion, we recommend testing to specific panel related to the phenotype and its associated genes. 6-9 We add genes to our panels as and when they meet the inclusion and validation criteria.
5 Clinical utility of SudD incode Benefits Confirmation of diagnosis* Establishment of preventive measures Reproductive counselling Index case * when the causal mutation is found Presymptomatic diagnosis Establishment of preventive measures Reproductive counselling Adjustment of frequency of clinical monitoring Provides the basis for the pathogenicity study** Familial 10, 11 ** Familial segregation studies are essential to analyse pathogenicity. Graphs adapted from text ref. 10.
6 Clinical guidelines Current guidelines 12, 13 recommend genetic analysis of the genes associated with the clinical suspicion. There are more than 50 different genes associated with channelopathies and cardiomyopathies 14, so next-generation sequencing (NGS) is the solution of choice for identifying them. 15 Sequencing the complete gene is extremely important. 16
7 Our panels and their phenotype coverage Undetermined diagnosis Sudden infant death syndrome (SIDS) Idiopathic ventricular fibrillation Unexplained syncope Unexplained sudden death Suspected hereditary sudden death Structural disease Arrhythmogenic Right Ventricle Cardiopathy (ARVC) Hypertrophic Cardiomyopathy (HCM) Unexplained Cardiac Hypertrophy (UCH) Dilated Cardiomyopathy (DCM) Left Ventricular Noncompaction Cardiomyopathy [adult and neonatal] (LVNC) Restrictive cardiomyopathy HCM panel (29 genes) DCM panel (38 genes) Structural panel (50 genes) Familial cardiopathy panel (76 genes) Extended familial cardiopathy panel* (108 genes) Arrhythmogenic disease Long QT syndrome (LQTS) Brugada syndrome (BrS) Short QT syndrome (SQTS) Unexplained bradycardia Catecholaminergic polymorphic ventricular tachycardia (CPVT) Progressive cardiac conduction defect Arrhythmogenic panel I (33 genes) Atrial Fibrillation Sudden Death associated to epilepsy Early repolarisation syndrome Sick sinus syndrome Arrhythmogenic panel II (31 genes) Aortic vascular disease Non-syndromic: Familial thoracic aortic aneurysm and dissection (TAAD) Syndromic: Marfan Syndrome (MS) Type IV Ehlers Danlos syndrome Loeys Dietz syndrome Aneurysm/osteoarthritis syndrome (AOS) TAAD and Marfan syndrome panel (11 genes) *This panel includes new phenotypes and new genes with lower prevalence than the phenotypes included in the less extensive version (familial cardiopathy panel).
8 NGS, next-gener NGS, the present and the future of genetic analysis for clinical diagnosis Multiple studies have been published that have led to genetic 17, 18 diagnosis programmes based on the use of NGS. NGS sequencing is around 20 times cheaper than Sanger sequencing as well as being much faster, without losing precision. 13 NGS, technological evolution. 15 * More genes analysed Lower cost Less time With the same precision *Compared to the Sanger technique, used to date.
9 ation sequencing Our NGS service NGS panels are performed using the oligonucleotide-based target-capture technique (enrichment array designed and validated for exclusive use by Ferrer incode). Ultrasequencing on Illumina inc platform (HiSeq2000 or MiSeq). Obtaining genetic variants combines SAMTOOLS and our own program (GendiCall) to identify possible variations. Data are expressed based on the hg19 version of the genome. NGS is supplemented with Sanger technology (ABI 3710) to obtain > 99.9% coverage of encoding areas and exon-intron boundaries. More than 99.9% of substitution variants (SNPs) are detected, as well as small insertions and deletions of 1 to 6 nucleotides. All variants with possible pathogenic classification are confirmed by Sanger sequencing.
10 Technical specifications of the SudD incode service Genes analysed Exons analysed Bases analysed Call rate NGS at 30x SudD service call rate (NGS + Sanger) Extended familial cardiopathy 108 1, , % Familial cardiopathy 76 1, , % Arrhythmogenic I , % NGS panels Arrhythmogenic II , % > 99.99% Structural 50 1, ,908 HCM , % DCM ,895 TAAD and Marfan syndrome , % Sanger Variable according to selected genes N/A 100%
11 References: 1. De Asmundis C et al. Epidemiology of Sudden Cardiac Death. Rev Esp Cardiol Supl. 2013;13(A):2-6 - Vol. 13 Núm.Supl.A. 2. Teekakirikul P et al. Review: Inherited Cardiomyopathies. Molecular Genetics and Clinical Genetic Testing in the Postgenomic Era. J Mol Diagn Mar;15(2): Tang Y et al. Molecular diagnostics of cardiovascular diseases in sudden unexplained death. Cardiovasc Pathol Jan-Feb;23(1): Brugada J et al. Sudden Cardiac Death. The Need for a Comprhensive Disease Managment Strategy. Rev Esp Cardiol Supl. 2013;13(A):1. 5. Arthur A et al. Genetic testing for inherited cardiac disease. Nat Rev Cardiol Oct;10(10): Voelkerding KV et al. Next-generation sequencing: from basic research to diagnostics. Clin Chem Apr;55(4): Voelkerding KV et al. Next generation sequencing for clinical diagnostics-principles and application to targeted resequencing for hypertrophic cardiomyopathy: a paper from the 2009 William Beaumont Hospital Symposium on Molecular Pathology. J Mol Diagn Sep;12(5): Dames S et al. Comparison of the Illumina Genome Analyzer and Roche 454 GS FLX for resequencing of hypertrophic cardiomyopathy-associated genes. J Biomol Tech Jul;21(2): Gowrisankar S et al. Evaluation of second-generation sequencing of 19 dilated cardiomyopathy genes for clinical applications. J Mol Diagn Nov;12(6): Riuró H et al. Genetic analysis, in silico prediction, and family segregation in long QT syndrome. Eur J Hum Genet Jan;23(1): Pérez-Serra A et al. A novel mutation in lamin a/c causing familial dilated cardiomyopathy associated with sudden cardiac death. J Card Fail Mar;21(3): Ackerman MJ et al. HRS/ EHRA expert consensus statement on the state of genetic testing for the channelopathies and cardiomyopathies. This document was developed as a partnership between the Heart Rhythm Society (HRS) and the European Heart Rhythm Association (EHRA). Heart Rhythm Aug;8(8): Elliott PM et al ESC Guidelines on diagnosis and management of hypertrophic cardiomyopathy: the Task Force for the Diagnosis and Management of Hypertrophic Cardiomyopathy of the European Society of Cardiology (ESC). Eur Heart J Oct 14;35(39): Tester DJ et al. Genetic testing for potentially lethal, highly treatable inherited cardiomyopathies/channelopathies in clinical practice. Circulation Mar 8;123(9): Allegue C. New Genetic Diagnostic Tests for Sudden Cardiac Death. Rev Esp Cardiol Supl. 2013;13(A): Ashley EA et al. Genetics and cardiovascular disease: a policy statement from the American Heart Association. Circulation Jul 3;126(1): Brion M et al. New technologies in the genetic approach to sudden cardiac death in the young. Forensic Sci Int Dec 15;203 (1-3): Meder B et al. Targeted next-generation sequencing for the molecular genetic diagnostics of cardiomyopathies. Circ Cardiovasc Genet Apr;4(2):
12 Results in 10 weeks Ability to analyse related genetic variants in a single process. NGS, a cost-effective technological evolution in the genetic analysis of SCD. Analytical quality, analysis of more than 99.99% in gene sequencing. Genetic and clinical counselling from specialists with extensive international experience. Customer Service customerservice@ferrerincode.com Tel SIC ed. 04/15 FOR THE EXCLUSIVE USE OF HEALTHCARE PROFESSIONALS
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