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Brugada syndrome cacna1c

Liyong Zhang, David J Tester, Di Lang, Yili Chen, Jinxiang Zheng, Rui Gao, Robert F Corliss, Shuangbo Tang, John W Kyle, Chao Liu, Michael J Ackerman, Jonathan C Makielski, Jianding Cheng
OBJECTIVE: To look for previously unrecognized cardiac structural abnormalities and address the genetic cause for sudden unexplained nocturnal death syndrome (SUNDS). METHODS: Data for 148 SUNDS victims and 444 controls (matched 1:3 on sex, race, and age of death within 1 year) were collected from Sun Yat-sen University from January 1, 1998, to December 31, 2014, to search morphological changes. An additional 17 patients with Brugada syndrome (BrS) collected from January 1, 2006, to December 31, 2014, served as a comparative disease cohort...
October 1, 2016: Mayo Clinic Proceedings
Brittan S Sutphin, Nicole J Boczek, Héctor Barajas-Martínez, Dan Hu, Dan Ye, David J Tester, Charles Antzelevitch, Michael J Ackerman
INTRODUCTION: Perturbations in the CACNA1C-encoded L-type calcium channel α-subunit have been linked recently to heritable arrhythmia syndromes, including Timothy syndrome, Brugada syndrome, early repolarization syndrome, and long QT syndrome. These heritable arrhythmia syndromes may serve as a pathogenic basis for autopsy-negative sudden unexplained death in the young (SUDY). However, the contribution of CACNA1C mutations to SUDY is unknown. OBJECTIVE: We set out to determine the spectrum, prevalence, and pathophysiology of rare CACNA1C variants in SUDY...
May 24, 2016: Congenital Heart Disease
Catarina Allegue, Mònica Coll, Jesus Mates, Oscar Campuzano, Anna Iglesias, Beatriz Sobrino, Maria Brion, Jorge Amigo, Angel Carracedo, Pedro Brugada, Josep Brugada, Ramon Brugada
BACKGROUND: The use of next-generation sequencing enables a rapid analysis of many genes associated with sudden cardiac death in diseases like Brugada Syndrome. Genetic variation is identified and associated with 30-35% of cases of Brugada Syndrome, with nearly 20-25% attributable to variants in SCN5A, meaning many cases remain undiagnosed genetically. To evaluate the role of genetic variants in arrhythmogenic diseases and the utility of next-generation sequencing, we applied this technology to resequence 28 main genes associated with arrhythmogenic disorders...
2015: PloS One
Megumi Fukuyama, Seiko Ohno, Takeru Makiyama, Minoru Horie
AIMS: The expression of sodium channel Nav1.8 in cardiac nervous systems has been identified, and variants of SCN10A that encodes Nav1.8 contribute to the development of Brugada syndrome (BrS) by modifying the function of Nav1.5 or directly reducing the sodium current. The aim of this study was to identify the frequency of SCN10A mutations in Japanese patients with BrS and to compare the phenotypical differences between patients with BrS and those who have other BrS-causative genes. METHODS AND RESULTS: This study involved 240 Japanese probands who were clinically suspected with BrS and were negative for mutations in major BrS-related genes...
June 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
Rebecca R Crawford, Ashlee N Higdon, David B Casey, David E Good, Imran N Mungrue
This case demonstrates two important points about Brugada syndrome unmasking: electrocardiograph abnormality severity may correspond to lithium levels and unmasking may occur in the therapeutic range of lithium. Also, the correlation of CACNA1C with Brugada and Bipolar suggests allelic disequilibrium, leading to a subpopulation of bipolar patients sensitive to arrhythmia.
January 2015: Clinical Case Reports
Solena Le Scouarnec, Matilde Karakachoff, Jean-Baptiste Gourraud, Pierre Lindenbaum, Stéphanie Bonnaud, Vincent Portero, Laëtitia Duboscq-Bidot, Xavier Daumy, Floriane Simonet, Raluca Teusan, Estelle Baron, Jade Violleau, Elodie Persyn, Lise Bellanger, Julien Barc, Stéphanie Chatel, Raphaël Martins, Philippe Mabo, Frédéric Sacher, Michel Haïssaguerre, Florence Kyndt, Sébastien Schmitt, Stéphane Bézieau, Hervé Le Marec, Christian Dina, Jean-Jacques Schott, Vincent Probst, Richard Redon
The Brugada syndrome (BrS) is a rare heritable cardiac arrhythmia disorder associated with ventricular fibrillation and sudden cardiac death. Mutations in the SCN5A gene have been causally related to BrS in 20-30% of cases. Twenty other genes have been described as involved in BrS, but their overall contribution to disease prevalence is still unclear. This study aims to estimate the burden of rare coding variation in arrhythmia-susceptibility genes among a large group of patients with BrS. We have developed a custom kit to capture and sequence the coding regions of 45 previously reported arrhythmia-susceptibility genes and applied this kit to 167 index cases presenting with a Brugada pattern on the electrocardiogram as well as 167 individuals aged over 65-year old and showing no history of cardiac arrhythmia...
May 15, 2015: Human Molecular Genetics
Delphine M Béziau, Julien Barc, Thomas O'Hara, Laurianne Le Gloan, Mohamed Yassine Amarouch, Aude Solnon, Dominique Pavin, Simon Lecointe, Patricia Bouillet, Jean-Baptiste Gourraud, Pascale Guicheney, Isabelle Denjoy, Richard Redon, Philippe Mabo, Hervé le Marec, Gildas Loussouarn, Florence Kyndt, Jean-Jacques Schott, Vincent Probst, Isabelle Baró
Brugada syndrome (BrS) is characterized by ST-segment elevation in the right precordial leads and is associated with increased risk of sudden cardiac death. We have recently reported families with BrS and SCN5A mutations where some affected members do not carry the familial mutation. We evaluated the involvement of additional genetic determinants for BrS in an affected family. We identified three distinct gene variants within a family presenting BrS (5 individuals), cardiac conduction defects (CCD, 3 individuals) and shortened QT interval (4 individuals)...
2014: Basic Research in Cardiology
Amane Araki, Masahisa Katsuno, Keisuke Suzuki, Haruhiko Banno, Noriaki Suga, Atsushi Hashizume, Tomoo Mano, Yasuhiro Hijikata, Hideaki Nakatsuji, Hirohisa Watanabe, Masahiko Yamamoto, Takeru Makiyama, Seiko Ohno, Megumi Fukuyama, Shin-Ichiro Morimoto, Minoru Horie, Gen Sobue
OBJECTIVE: The aim of this study was to clarify myocardial involvement and its clinical implications in subjects with spinal and bulbar muscular atrophy (SBMA), a neuromuscular disease affecting both neuronal and nonneuronal tissues. METHODS: Two independent cardiologists evaluated ECGs from a total of 144 consecutive subjects with SBMA. We performed immunohistochemical, immunoblot, and quantitative real-time PCR analyses of autopsied myocardium. RESULTS: Abnormal ECGs were detected in 70 (48...
May 20, 2014: Neurology
Matthew E Hartman, Yonggang Liu, Wei-Zhong Zhu, Wei-Ming Chien, Chad S Weldy, Glenn I Fishman, Michael A Laflamme, Michael T Chin
CHF1/Hey2 is a Notch-responsive basic helix-loop-helix transcription factor involved in cardiac development. Common variants in Hey2 are associated with Brugada syndrome. We hypothesized that absence of CHF1/Hey2 would result in abnormal cellular electrical activity, altered cardiac conduction system (CCS) development, and increased arrhythmogenesis. We isolated neonatal CHF/Hey2-knockout (KO) cardiac myocytes and measured action potentials and ion channel subunit gene expression. We also crossed myocardial-specific CHF1/Hey2-KO mice with cardiac conduction system LacZ reporter mice and stained for conduction system tissue...
July 2014: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
Qi Wang, Seiko Ohno, Wei-Guang Ding, Megumi Fukuyama, Akashi Miyamoto, Hideki Itoh, Takeru Makiyama, Jie Wu, Jiayu Bai, Kanae Hasegawa, Tetsuji Shinohara, Naohiko Takahashi, Akihiko Shimizu, Hiroshi Matsuura, Minoru Horie
BACKGROUND: Brugada syndrome (BrS) is an inherited disease characterized by right precordial ST segment elevation on electrocardiograms (ECGs) that predisposes patients to sudden cardiac death as a result of polymorphic ventricular tachyarrhythmia or ventricular fibrillation (VF). In BrS patients, except for SCN5A, mutations in other responsible genes are poorly elucidated. METHODS AND RESULTS: We identified 4 KCNH2 mutations, T152I, R164C, W927G, and R1135H, in 236 consecutive probands with BrS or Brugada-like ECG...
May 2014: Journal of Cardiovascular Electrophysiology
Marina Cerrone, Xianming Lin, Mingliang Zhang, Esperanza Agullo-Pascual, Anna Pfenniger, Halina Chkourko Gusky, Valeria Novelli, Changsung Kim, Tiara Tirasawadichai, Daniel P Judge, Eli Rothenberg, Huei-Sheng Vincent Chen, Carlo Napolitano, Silvia G Priori, Mario Delmar
BACKGROUND: Brugada syndrome (BrS) primarily associates with the loss of sodium channel function. Previous studies showed features consistent with sodium current (INa) deficit in patients carrying desmosomal mutations, diagnosed with arrhythmogenic cardiomyopathy (or arrhythmogenic right ventricular cardiomyopathy). Experimental models showed correlation between the loss of expression of desmosomal protein plakophilin-2 (PKP2) and reduced INa. We hypothesized that PKP2 variants that reduce INa could yield a BrS phenotype, even without overt structural features characteristic of arrhythmogenic right ventricular cardiomyopathy...
March 11, 2014: Circulation
Megumi Fukuyama, Seiko Ohno, Qi Wang, Takeshi Shirayama, Hideki Itoh, Minoru Horie
BACKGROUND: Brugada syndrome (BrS) is an inherited cardiac arrhythmia associated with sudden death due to ventricular fibrillation. Mutations in genes related to the cardiac L-type calcium channel have been reported to be causative of BrS. Generally, the messenger RNA (mRNA) that contains a nonsense mutation is rapidly degraded via its decay pathway, which is known as nonsense-mediated mRNA decay (NMD). Previously, we reported a male patient with BrS who carried c.1896G>A (the first nucleotide of CACNA1C exon 14), which caused a synonymous mutation, p...
April 2014: Heart Rhythm: the Official Journal of the Heart Rhythm Society
Jessica A Hennessey, Cherisse A Marcou, Chuan Wang, Eric Q Wei, Chaojian Wang, David J Tester, Margherita Torchio, Federica Dagradi, Lia Crotti, Peter J Schwartz, Michael J Ackerman, Geoffrey S Pitt
BACKGROUND: Less than 30% of the cases of Brugada syndrome (BrS) have an identified genetic cause. Of the known BrS-susceptibility genes, loss-of-function mutations in SCN5A or CACNA1C and their auxiliary subunits are most common. On the basis of the recent demonstration that fibroblast growth factor (FGF) homologous factors (FHFs; FGF11-FGF14) regulate cardiac Na(+) and Ca(2+) channel currents, we hypothesized that FHFs are candidate BrS loci. OBJECTIVE: The goal of this study was to test whether FGF12 is a candidate BrS locus...
December 2013: Heart Rhythm: the Official Journal of the Heart Rhythm Society
Megumi Fukuyama, Seiko Ohno, Qi Wang, Hiromi Kimura, Takeru Makiyama, Hideki Itoh, Makoto Ito, Minoru Horie
BACKGROUND: Mutations in genes encoding the L-type cardiac calcium channel (LTCC) are associated with various types of inherited arrhythmias, including Brugada syndrome (BrS). However, the frequency in Asian populations remains unknown. This study aimed to elucidate disease-causing mutations in LTCC-related genes in Japanese patients diagnosed as BrS or idiopathic ventricular fibrillation (IVF), early repolarization syndrome, short QT syndrome, and compare them with those carrying SCN5A mutations...
2013: Circulation Journal: Official Journal of the Japanese Circulation Society
Tadashi Nakajima, Jie Wu, Yoshiaki Kaneko, Takashi Ashihara, Seiko Ohno, Tadanobu Irie, Wei-Guang Ding, Hiroshi Matsuura, Masahiko Kurabayashi, Minoru Horie
BACKGROUND: Brugada syndrome (BrS) is genetically heterogeneous. In Japanese BrS patients, except for SCN5A and KCNE5, mutations in the responsible genes have not yet been identified, and therefore the genetic heterogeneity remains poorly elucidated. METHODS AND RESULTS: Forty consecutive patients with Brugada-pattern electrocardiogram (ECG) underwent comprehensive genetic analysis of BrS-causing genes including SCN5A, SCN1B, SCN3B, CACNA1C, CACNB2, KCNE3 and KCNE5...
2012: Circulation Journal: Official Journal of the Japanese Circulation Society
Andrés Ricardo Pérez-Riera, Luiz Carlos de Abreu, Frank Yanowitz, Raimundo Barbosa Barros, Francisco Femenía, William F McIntyre, Adrian Baranchuk
In the great majority of cases the ECG pattern of early repolarization (ERP) is a benign phenomenon observed predominantly in teenagers, young adults, male athletes and the black race. The universally accepted criterion for its diagnosis is the presence, in at least two adjoining leads, of ≥ 1 mm or 0.1 mV ST segment elevation. In benign ERP reciprocal ST segment changes are possible only in lead aVR. In contrast, reciprocal ST segment changes can be observed in several leads in idiopathic ventricular fibrillation (IVF) and acute coronary syndrome...
2012: Cardiology Journal
Giuseppe Lippi, Martina Montagnana, Tiziana Meschi, Ivan Comelli, Gianfranco Cervellin
The Brugada Syndrome (BS) is a "channellopathy," characterized by ion (e.g., sodium, calcium, and potassium) channel dysfunction and typical ECG alterations, originally described by Osher and Wolff in 1953 and further elucidated by Josep and Pedro Brugada in 1991. BS is typically associated with a high risk for sudden cardiac death (SCD) in young and otherwise healthy adults. Although in several patients the heart is structurally normal, subtle structural abnormalities in the right ventricular outflow tract are increasingly been reported...
2012: Advances in Clinical Chemistry
Elena Burashnikov, Ryan Pfeiffer, Héctor Barajas-Martinez, Eva Delpón, Dan Hu, Mayurika Desai, Martin Borggrefe, Michel Häissaguerre, Ronald Kanter, Guido D Pollevick, Alejandra Guerchicoff, Ruben Laiño, Mark Marieb, Koonlawee Nademanee, Gi-Byoung Nam, Roberto Robles, Rainer Schimpf, Dwight D Stapleton, Sami Viskin, Stephen Winters, Christian Wolpert, Samuel Zimmern, Christian Veltmann, Charles Antzelevitch
BACKGROUND: L-type calcium channel (LTCC) mutations have been associated with Brugada syndrome (BrS), short QT (SQT) syndrome, and Timothy syndrome (LQT8). Little is known about the extent to which LTCC mutations contribute to the J-wave syndromes associated with sudden cardiac death. OBJECTIVE: The purpose of this study was to identify mutations in the α1, β2, and α2δ subunits of LTCC (Ca(v)1.2) among 205 probands diagnosed with BrS, idiopathic ventricular fibrillation (IVF), and early repolarization syndrome (ERS)...
December 2010: Heart Rhythm: the Official Journal of the Heart Rhythm Society
Paula L Hedley, Poul Jørgensen, Sarah Schlamowitz, Johanna Moolman-Smook, Jørgen K Kanters, Valerie A Corfield, Michael Christiansen
Brugada syndrome (BrS) is a condition characterized by a distinct ST-segment elevation in the right precordial leads of the electrocardiogram and, clinically, by an increased risk of cardiac arrhythmia and sudden death. The condition predominantly exhibits an autosomal dominant pattern of inheritance with an average prevalence of 5:10,000 worldwide. Currently, more than 100 mutations in seven genes have been associated with BrS. Loss-of-function mutations in SCN5A, which encodes the alpha-subunit of the Na(v)1...
September 2009: Human Mutation
Jonathan M Cordeiro, Mark Marieb, Ryan Pfeiffer, Kirstine Calloe, Elena Burashnikov, Charles Antzelevitch
Recent studies have demonstrated an association between mutations in CACNA1c or CACNB2b and Brugada syndrome (BrS). Previously described mutations all caused a loss of function secondary to a reduction of peak calcium current (I(Ca)). We describe a novel CACNB2b mutation associated with BrS in which loss of function is caused by accelerated inactivation of I(Ca). The proband, a 32 year old male, displayed a Type I ST segment elevation in two right precordial ECG leads following a procainamide challenge. EP study was positive with induction of polymorphic VT/VF...
May 2009: Journal of Molecular and Cellular Cardiology
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