- Is a 57 gene panel that includes assessment of non-coding variants
Is ideal for patients with a clinical diagnosis or suspicion of a hereditary arrhythmia disorder.
Note: Variants in the KCNE1 gene should not be used for risk assessment at the moment. Specifically, KCNE1 c.253G>A, p.(Asp85Asn) variant has been considered to be a mild risk factor for acquired long QT syndrome. However, in the newest version of the reference genome GRCh38, a gene KCNE1B, nearly identical to KCNE1 has appeared. By using standard NGS technologies, as well as Sanger sequencing, it is not possible to get reliable region-specific sequences for these genes. It is likely that reads that have been earlier mapped to KCNE1 actually belong to KCNE1B. Moreover, it is currently unclear whether KCNE1B produces a protein product, and if a protein is produced, whether the gene is expressed in heart. More independent data characterizing KCNE1B and its function are needed. Currently, all KCNE1 sequence data and the literature related to KCNE1 variants should be interpreted with caution.
Number of genes57
CPT codesSEQ 81413
The Blueprint Genetics Arrhythmia Panel (test code CA1601):
- Is a 57 gene panel that includes assessment of selected non-coding disease-causing variants
- Is available as PLUS analysis (sequencing analysis and deletion/duplication analysis), sequencing analysis only or deletion/duplication analysis only
Commonly used ICD-10 code(s) when ordering the Arrhythmia Panel
|I49.9||Catecholaminergic polymorphic ventricular tachycardia (CPVT)|
|I46.2||Cardiac arrest underlying cardiac condition|
|I46.9||Cardiac arrest cause unspecified|
|I45.81||Long QT syndrome|
|I42.8||Arrhythmogenic right ventricular cardiomyopathy (ARVC)|
|I49.9||Short QT syndrome|
- EDTA blood, min. 1 ml
- Purified DNA, min. 3μg
- Saliva (Oragene DNA OG-500 kit)
Label the sample tube with your patient’s name, date of birth and the date of sample collection.
Note that we do not accept DNA samples isolated from formalin-fixed paraffin-embedded (FFPE) tissue.
This comprehensive panel includes genes from the following panels: Long QT Syndrome (LQTS) Panel, Brugada Syndrome Panel, Catecholaminergic Polymorphic Ventricular Tachycardia (CPVT) Panel, Short QT Syndrome (SQTS) Panel and Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC) Panel.
All the diseases included in the Arrhythmia Panel manifest with similar symptoms such as palpitations, pre-syncope/syncope or sudden cardiac death. Although clinical evaluation, ECG and echocardiography are considered helpful, they rarely offer a definitive diagnosis of a specific arrhythmia disease. Effective and safe arrhythmia treatments have been challenging to develop as severe arrhythmias represent a heterogeneous group of diseases with diverse cellular mechanisms. The role of a molecular diagnosis is becoming increasingly important as it can inform the diagnosis, prognosis, and treatment of hereditary arrhythmia diseases for both the patient and their family members.
Genes in the Arrhythmia Panel and their clinical significance
|ABCC9||Atrial fibrillation, Cantu syndrome, Dilated cardiomyopathy (DCM)||AD||25||40|
|AKAP9||Long QT syndrome||AD||4||33|
|ANK2||Cardiac arrhythmia, Long QT syndrome||AD||7||70|
|BAG3||Dilated cardiomyopathy (DCM), Myopathy, myofibrillar||AD||36||60|
|CACNA1C*||Brugada syndrome, Timothy syndrome||AD||20||62|
|CALM1*||Ventricular tachycardia, catecholaminergic polymorphic, Recurrent cardiac arrest, infantile, Long QT syndrome||AD||9||10|
|CALM2||Long QT syndrome||AD||7||10|
|CALM3||Catecholaminergic polymorphic ventricular tachycardia||AD/AR||4||4|
|CASQ2||Ventricular tachycardia, catecholaminergic, polymorphic||AR||24||33|
|CAV3||Creatine phosphokinase, elevated serum, Hypertrophic cardiomyopathy (HCM), Long QT syndrome, Muscular dystrophy, limb-girdle, type IC, Myopathy, distal, Tateyama type, Rippling muscle disease 2||AD/Digenic||21||49|
|CDH2||Arrhythmogenic right ventricular cardiomyopathy (ARVC)||AD||5|
|CTNNA3||Arrhythmogenic right ventricular dysplasia||AD||6||41|
|DBH||Dopamine beta-hydroxylase deficiency||AR||10||13|
|DES||Dilated cardiomyopathy (DCM), Myopathy, myofibrillar, Scapuloperoneal syndrome, neurogenic, Kaeser type||AD/AR||61||117|
|DSC2||Arrhythmogenic right ventricular dysplasia with palmoplantar keratoderma and woolly hair, Arrhythmogenic right ventricular dysplasia||AD/AR||25||85|
|DSG2||Arrhythmogenic right ventricular dysplasia, Dilated cardiomyopathy (DCM)||AD||40||125|
|DSP||Cardiomyopathy, dilated, with wooly hair, keratoderma, and tooth agenesis, Arrhythmogenic right ventricular dysplasia, familial, Cardiomyopathy, dilated, with wooly hair and keratoderma, Keratosis palmoplantaris striata II, Epidermolysis bullosa, lethal acantholytic||AD/AR||155||281|
|GATA6||Heart defects, congenital, and other congenital anomalies, Atrial septal defect 9, atrioventricular septal defect 5, Persistent truncus arteriosus, Tetralogy of Fallot||AD||16||79|
|HADHA||Trifunctional protein deficiency, Long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency||AR||50||70|
|HCN4||Sick sinus syndrome, Brugada syndrome||AD||9||28|
|JUP||Arrhythmogenic right ventricular dysplasia, Naxos disease||AD/AR||8||43|
|KCNE1||Long QT syndrome, Jervell and Lange-Nielsen syndrome||AD/AR/Digenic||7||45|
|KCNE2||Long QT syndrome, Atrial fibrillation, familial||AD||6||23|
|KCNH2||Short QT syndrome, Long QT syndrome||AD||346||925|
|KCNJ2||Short QT syndrome, Andersen syndrome, Long QT syndrome, Atrial fibrillation||AD||41||87|
|KCNJ5||Long QT syndrome, Hyperaldosteronism, familial||AD||7||15|
|KCNQ1||Short QT syndrome, Long QT syndrome, Atrial fibrillation, Jervell and Lange-Nielsen syndrome||AD/AR/Digenic||285||604|
|LDB3||Dilated cardiomyopathy (DCM), Myopathy, myofibrillar||AD||9||14|
|LMNA||Heart-hand syndrome, Slovenian, Limb-girdle muscular dystrophy, Muscular dystrophy, congenital, LMNA-related, Lipodystrophy (Dunnigan), Emery-Dreiffus muscular dystrophy, Malouf syndrome, Dilated cardiomyopathy (DCM), Mandibuloacral dysplasia type A, Progeria Hutchinson-Gilford type||AD/AR||231||553|
|MYH6||Hypertrophic cardiomyopathy (HCM), Dilated cardiomyopathy (DCM), Atrial septal defect 3||AD||13||114|
|MYH7||Hypertrophic cardiomyopathy (HCM), Myopathy, myosin storage, Myopathy, distal, Dilated cardiomyopathy (DCM)||AD||285||950|
|MYL4||Atrial fibrillation, familial, 18||AD||2||2|
|NKX2-5||Conotruncal heart malformations, Hypothyroidism, congenital nongoitrous,, Atrial septal defect, Ventricular septal defect 3, Conotruncal heart malformations, variable, Tetralogy of Fallot||AD||43||102|
|NUP155||Atrial fibrillation 15||AR||2||1|
|PKP2*||Arrhythmogenic right ventricular dysplasia||AD||141||275|
|PLN||Hypertrophic cardiomyopathy (HCM), Dilated cardiomyopathy (DCM)||AD/AR||8||29|
|PPA2||Sudden cardiac failure, infantile||AR||8||8|
|RYR2||Ventricular tachycardia, catecholaminergic polymorphic, Arrhythmogenic right ventricular dysplasia||AD||113||353|
|SALL4||Acro-renal-ocular syndrome, Duane-radial ray/Okohiro syndrome||AD||19||55|
|SCN1B||Atrial fibrillation, Brugada syndrome, Generalized epilepsy with febrile seizures plus, Epilepsy, generalized, with febrile seizures plus, type 1, Epileptic encephalopathy, early infantile, 52||AD||15||29|
|SCN3B||Atrial fibrillation, familial, Brugada syndrome||AD||3||7|
|SCN5A||Heart block, nonprogressive, Heart block, progressive, Long QT syndrome, Ventricular fibrillation, Atrial fibrillation, Sick sinus syndrome, Brugada syndrome, Dilated cardiomyopathy (DCM)||AD/AR/Digenic||225||829|
|SCN10A||Paroxysmal extreme pain disorder, Channelopathy-associated congenital insensitivity to pain, Primary erythermalgia, Sodium channelopathy-related small fiber neuropathy, Brugada syndrome||AD/AR||1||70|
|TECRL||Ventricular tachycardia, catecholaminergic polymorphic, 3||AR||2||2|
|TGFB3||Loeys-Dietz syndrome (Reinhoff syndrome), Arrhythmogenic right ventricular dysplasia||AD||17||22|
|TMEM43||Arrhythmogenic right ventricular dysplasia, Emery-Dreifuss muscular dystrophy||AD||5||24|
|TNNI3||Hypertrophic cardiomyopathy (HCM), Cardiomyopathy, restrictive, Dilated cardiomyopathy (DCM)||AD/AR||54||127|
|TNNI3K||Cardiac conduction disease with or without dilated cardiomyopathy||AD||1||2|
|TNNT2||Left ventricular noncompaction, Hypertrophic cardiomyopathy (HCM), Cardiomyopathy, restrictive, Dilated cardiomyopathy (DCM)||AD||57||140|
|TRDN||Ventricular tachycardia, catecholaminergic polymorphic||AR||10||6|
|TRPM4||Progressive familial heart block||AD||5||29|
|TTN*||Dilated cardiomyopathy (DCM), Tibial muscular dystrophy, Limb-girdle muscular dystrophy, Hereditary myopathy with early respiratory failure, Myopathy, early-onset, with fatal cardiomyopathy (Salih myopathy), Muscular dystrophy, limb-girdle, type 2J||AD||725||304|
* Some, or all, of the gene is duplicated in the genome. Read more.
# The gene has suboptimal coverage (means <90% of the gene’s target nucleotides are covered at >20x with mapping quality score (MQ>20) reads).
The sensitivity to detect variants may be limited in genes marked with an asterisk (*) or number sign (#)
Gene refers to the HGNC approved gene symbol; Inheritance refers to inheritance patterns such as autosomal dominant (AD), autosomal recessive (AR), X-linked (XL), X-linked dominant (XLD) and X-linked recessive (XLR); ClinVar refers to the number of variants in the gene classified as pathogenic or likely pathogenic in this database (ClinVar); HGMD refers to the number of variants with possible disease association in the gene listed in Human Gene Mutation Database (HGMD). The list of associated, gene specific phenotypes are generated from CGD or Orphanet databases.
Non-coding variants covered by the panel
|Gene||Genomic location HG19||HGVS||RefSeq||RS-number|
Test strengthThe strengths of this test include:
- CAP and ISO-15189 accreditations covering all operations at Blueprint Genetics including all Whole Exome Sequencing, NGS panels and confirmatory testing
- CLIA-certified personnel performing clinical testing in a CLIA-certified laboratory
- Powerful sequencing technologies, advanced target enrichment methods and precision bioinformatics pipelines ensure superior analytical performance
- Careful construction of clinically effective and scientifically justified gene panels
- Our Nucleus online portal providing transparent and easy access to quality and performance data at the patient level
- Our publically available analytic validation demonstrating complete details of test performance
- ~1,500 non-coding disease causing variants in Blueprint WES assay (please see below ‘Non-coding disease causing variants covered by this panel’)
- Our rigorous variant classification based on modified ACMG variant classification scheme
- Our systematic clinical interpretation workflow using proprietary software enabling accurate and traceable processing of NGS data
- Our comprehensive clinical statements
Test limitationsThis test does not detect the following:
- Complex inversions
- Gene conversions
- Balanced translocations
- Mitochondrial DNA variants
- Repeat expansion disorders unless specifically mentioned
- Non-coding variants deeper than ±20 base pairs from exon-intron boundary unless otherwise indicated (please see above Panel Content / non-coding variants covered by the panel).
This test may not reliably detect the following:
- Low level mosaicism (variant with a minor allele fraction of 14.6% is detected with 90% probability)
- Stretches of mononucleotide repeats
- Indels larger than 50bp
- Single exon deletions or duplications
- Variants within pseudogene regions/duplicated segments
The sensitivity of this test may be reduced if DNA is extracted by a laboratory other than Blueprint Genetics.
For additional information, please refer to the Test performance section and see our Analytic Validation.
The Blueprint Genetics arrhythmia panel covers classical genes associated with Brugada syndrome, catecholaminergic polymorphic ventricular tachycardia (CPVT), cardiac arrest underlying cardiac condition, cardiac arrest cause unspecified, syncope and collapse, abnormal ECG, Long QT syndrome, arrhythmogenic right ventricular cardiomyopathy (ARVC) and Short QT syndrome. The genes on the panel have been carefully selected based on scientific literature, mutation databases and our experience.
Our panels are sliced from our high-quality whole exome sequencing data. Please see our sequencing and detection performance table for different types of alterations at the whole exome level (Table).
Assays have been validated for different starting materials including EDTA-blood, isolated DNA (no FFPE), saliva and dry blood spots (filter card) and all provide high-quality results. The diagnostic yield varies substantially depending on the assay used, referring healthcare professional, hospital and country. Blueprint Genetics’ Plus Analysis (Seq+Del/Dup) maximizes the chance to find a molecular genetic diagnosis for your patient although Sequence Analysis or Del/Dup Analysis may be a cost-effective first line test if your patient’s phenotype is suggestive of a specific mutation type.
Performance of Blueprint Genetics Whole Exome Sequencing (WES) assay. All individual panels are sliced from WES data.
|Sensitivity % (TP/(TP+FN)||Specificity %|
|Single nucleotide variants||99.65% (412,456/413,893)||>99.99%|
|Insertions, deletions and indels by sequence analysis|
|1-10 bps||96.94% (17,070/17,608)||>99.99%|
|11-50 bps||99.07% (957/966)||>99.99%|
|Copy number variants (exon level dels/dups)|
|Clinical samples (small CNVs, n=52)|
|1 exon level deletion||92.3% (24/26)||NA|
|2 exons level deletion/duplication||100.0% (11/11)||NA|
|3-7 exons level deletion/duplication||93.3% (14/15)||NA|
|Microdeletion/-duplication sdrs (large CNVs, n=37))|
|Size range (0.1-47 Mb)||100% (37/37)|
|Simulated CNV detection|
|2 exons level deletion/duplication||90.98% (7,357/8,086)||99.96%|
|5 exons level deletion/duplication||98.63% (7,975/8,086)||99.98%|
|The performance presented above reached by WES with the following coverage metrics|
|Mean sequencing depth at exome level||174x|
|Nucleotides with >20x sequencing coverage (%)||99.4%|
The target region for each gene includes coding exons and ±20 base pairs from the exon-intron boundary. In addition, the panel includes non-coding variants if listed above (Non-coding variants covered by the panel). Some regions of the gene(s) may be removed from the panel if specifically mentioned in the ‘Test limitations” section above. The sequencing data generated in our laboratory is analyzed with our proprietary data analysis and annotation pipeline, integrating state-of-the art algorithms and industry-standard software solutions. Incorporation of rigorous quality control steps throughout the workflow of the pipeline ensures the consistency, validity and accuracy of results. Our pipeline is streamlined to maximize sensitivity without sacrificing specificity. We have incorporated a number of reference population databases and mutation databases such as, but not limited, to 1000 Genomes Project, gnomAD, ClinVar and HGMD into our clinical interpretation software to make the process effective and efficient. For missense variants, in silico variant prediction tools such as SIFT, PolyPhen, MutationTaster are used to assist with variant classification. Through our online ordering and statement reporting system, Nucleus, the customer has an access to details of the analysis, including patient specific sequencing metrics, a gene level coverage plot and a list of regions with inadequate coverage if present. This reflects our mission to build fully transparent diagnostics where customers have easy access to crucial details of the analysis process.
We provide customers with the most comprehensive clinical report available on the market. Clinical interpretation requires a fundamental understanding of clinical genetics and genetic principles. At Blueprint Genetics, our PhD molecular geneticists, medical geneticists and clinical consultants prepare the clinical statement together by evaluating the identified variants in the context of the phenotypic information provided in the requisition form. Our goal is to provide clinically meaningful statements that are understandable for all medical professionals regardless of whether they have formal training in genetics.
Variant classification is the corner stone of clinical interpretation and resulting patient management decisions. Our classifications follow the Blueprint Genetics Variant Classification Schemes based on the ACMG guideline 2015. Minor modifications were made to increase reproducibility of the variant classification and improve the clinical validity of the report. Our experience with tens of thousands of clinical cases analyzed at our laboratory allowed us to further develop the industry standard.
The final step in the analysis of sequence variants is confirmation of variants classified as pathogenic or likely pathogenic using bi-directional Sanger sequencing. Variant(s) fulfilling the following criteria are not Sanger confirmed: the variant quality score is above the internal threshold for a true positive call, and visual check-up of the variant at IGV is in-line with the variant call. Reported variants of uncertain significance are confirmed with bi-directional Sanger sequencing only if the quality score is below our internally defined quality score for true positive call. Reported copy number variations with a size <10 exons are confirmed by orthogonal methods such as qPCR if the specific CNV has been seen less than three times at Blueprint Genetics.
Our clinical statement includes tables for sequencing and copy number variants that include basic variant information (genomic coordinates, HGVS nomenclature, zygosity, allele frequencies, in silico predictions, OMIM phenotypes and classification of the variant). In addition, the statement includes detailed descriptions of the variant, gene and phenotype(s) including the role of the specific gene in human disease, the mutation profile, information about the gene’s variation in population cohorts and detailed information about related phenotypes. We also provide links to the references used, congress abstracts and mutation databases to help our customers further evaluate the reported findings if desired. The conclusion summarizes all of the existing information and provides our rationale for the classification of the variant.
Identification of pathogenic or likely pathogenic variants in dominant disorders or their combinations in different alleles in recessive disorders are considered molecular confirmation of the clinical diagnosis. In these cases, family member testing can be used for risk stratification within the family. In the case of variants of uncertain significance (VUS), we do not recommend family member risk stratification based on the VUS result. Furthermore, in the case of VUS, we do not recommend the use of genetic information in patient management or genetic counseling.
Our interpretation team analyzes millions of variants from thousands of individuals with rare diseases. Thus, our database, and our understanding of variants and related phenotypes, is growing by leaps and bounds. Our laboratory is therefore well positioned to re-classify previously reported variants as new information becomes available. If a variant previously reported by Blueprint Genetics is re-classified, our laboratory will issue a follow-up statement to the original ordering health care provider at no additional cost.