title: Multiplex targeted high-throughput sequencing for Mendelian cardiac disorders.
abstract: Mendelian cardiomyopathies and arrhythmias are characterized by an important genetic heterogeneity, rendering Sanger sequencing very laborious and expensive. As a proof of concept, we explored multiplex targeted high-throughput sequencing (HTS) as a fast and cost-efficient diagnostic method for individuals suffering from Mendelian cardiac disorders. We designed a DNA capture assay including all exons from 130 genes involved in cardiovascular Mendelian disorders and analysed simultaneously four samples by multiplexing. Two patients had familial hypertrophic cardiomyopathy (HCM) and two patients suffered from long QT syndrome (LQTS). In patient 1 with HCM, we identified two known pathogenic missense variants in the two most frequently mutated sarcomeric genes MYH7 and MYBPC. In patient 2 with HCM, a known acceptor splice site variant in MYBPC3 was found. In patient 3 with LQTS, two missense variants in the genes SCN5A and KCNQ were identified. Finally, in patient 4 with LQTS a known missense variant was found in MYBPC3, which is usually mutated in patients with cardiomyopathy. Our results showed that multiplex targeted HTS works as an efficient and cost-effective tool for molecular diagnosis of heterogeneous disorders in clinical practice and offers new insights in the pathogenesis of these complex diseases.
authors.affiliation: Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Fokstuen
authors.forename: P
authors.initials: P
authors.lastname: Makrythanasis
authors.forename: S
authors.initials: S
authors.lastname: Nikolaev
authors.forename: F
authors.initials: F
authors.lastname: Santoni
authors.forename: D
authors.initials: D
authors.lastname: Robyr
authors.forename: A
authors.initials: A
authors.lastname: Munoz
authors.forename: J
authors.initials: J
authors.lastname: Bevillard
authors.forename: L
authors.initials: L
authors.lastname: Farinelli
authors.forename: C
authors.initials: C
authors.lastname: Iseli
authors.forename: S E
authors.initials: SE
authors.lastname: Antonarakis
authors.forename: J-L
authors.initials: JL
authors.lastname: Blouin
mesh_terms: D000368:Aged; D002312:Cardiomyopathy, Hypertrophic / Q000235:genetics*; D002648:Child; D059014:High-Throughput Nucleotide Sequencing / Q000191:economics; D006801:Humans; D008133:Long QT Syndrome / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009154:Mutation
keywords: DNA capture; Mendelian cardiac disorders; gene targeting; high-throughput sequencing; multiplexing