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Atrial Fibrillation Genes

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https://www.readbyqxmd.com/read/27914211/micrornas-in-cardiovascular-disease-clinical-application
#1
Christian Schulte, Mahir Karakas, Tanja Zeller
microRNAs (miRNAs) are well-known, powerful regulators of gene expression, and their potential to serve as circulating biomarkers is widely accepted. In cardiovascular disease (CVD), numerous studies have suggested miRNAs as strong circulating biomarkers with high diagnostic as well as prognostic power. In coronary artery disease (CAD) and heart failure (HF), miRNAs have been suggested as reliable biomarkers matching up to established protein-based such as cardiac troponins (cT) or natriuretic peptides. Also, in other CVD entities, miRNAs were identified as surprisingly specific biomarkers - with great potential for clinical applicability, especially in those entities that lack specific protein-based biomarkers such as atrial fibrillation (AF) and acute pulmonary embolism (APE)...
December 3, 2016: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/27884747/novel-function-of-%C3%AE-1d-l-type-calcium-channel-in-the-atria
#2
Ujala Srivastava, Ademuyiwa S Aromolaran, Frank Fabris, Deana Lazaro, John Kassotis, Yongxia Qu, Mohamed Boutjdir
Ca entry through atrial L-type Calcium channels (α1C and α1D) play an important role in muscular contraction, regulation of gene expression, and release of hormones including atrial natriuretic peptide (ANP), and brain natriuretic peptide (BNP). α1D Ca channel is exclusively expressed in atria, and has been shown to play a key role in the pathogenesis of atrial fibrillation. Recent data have shown that the small conductance calcium-activated potassium channel, SK4 is also atrial specific and also contributes prominently to the secretion of ANP and BNP...
November 22, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27870913/genomic-contributors-to-rhythm-outcome-of-atrial-fibrillation-catheter-ablation-pathway-enrichment-analysis-of-gwas-data
#3
Daniela Husser, Petra Büttner, Laura Ueberham, Borislav Dinov, Philipp Sommer, Arash Arya, Gerhard Hindricks, Andreas Bollmann
BACKGROUND: Left atrial enlargement and persistent atrial fibrillation (AF) are well-known predictors for arrhythmia recurrence after AF catheter ablation (LRAF). In this study, by using pathway enrichment analysis of GWAS data, we tested the hypothesis that genetic pathways associated with these phenotypes are also associated with LRAF. METHODS: Samples from 660 patients with paroxysmal (n = 370) or persistent AF (n = 290) undergoing de-novo AF catheter ablation were genotyped for ~1,000,000 SNPs...
2016: PloS One
https://www.readbyqxmd.com/read/27866707/a-functional-variant-associated-with-atrial-fibrillation-regulates-pitx2c-expression-through-tfap2a
#4
Jiangchuan Ye, Nathan R Tucker, Lu-Chen Weng, Sebastian Clauss, Steven A Lubitz, Patrick T Ellinor
The most significantly associated genetic locus for atrial fibrillation (AF) is in chromosomal region 4q25, where four independent association signals have been identified. Although model-system studies suggest that altered PITX2c expression might underlie the association, the link between specific variants and the direction of effect on gene expression remains unknown for all four signals. In the present study, we analyzed the AF-associated region most proximal to PITX2 at 4q25. First, we identified candidate regulatory variants that might confer AF risk through a combination of mammalian conservation, DNase hypersensitivity, and histone modification from ENCODE and the Roadmap Epigenomics Project, as well as through in vivo analysis of enhancer activity in embryonic zebrafish...
December 1, 2016: American Journal of Human Genetics
https://www.readbyqxmd.com/read/27861186/the-genetics-of-atrial-fibrillation
#5
Kenshi Hayashi, Hayato Tada, Masakazu Yamagishi
PURPOSE OF REVIEW: To describe recent findings regarding the role of rare and common genetic variants in atrial fibrillation. RECENT FINDINGS: Atrial fibrillation is associated with several clinical risk factors and its development is affected by genetic background. To date, rare variants from more than 30 genes have been identified from studies of familial cases or individuals with lone atrial fibrillation. In addition to using the candidate gene approach for the identification of rare variants, next-generation sequencing approaches such as genomic, whole exome and targeted sequencing have been employed...
January 2017: Current Opinion in Cardiology
https://www.readbyqxmd.com/read/27857207/genomic-contributors-to-atrial-electroanatomical-remodeling-and-atrial-fibrillation-progression-pathway-enrichment-analysis-of-gwas-data
#6
Daniela Husser, Laura Ueberham, Borislav Dinov, Jedrzej Kosiuk, Jelena Kornej, Gerhard Hindricks, M Benjamin Shoemaker, Dan M Roden, Andreas Bollmann, Petra Büttner
In atrial fibrillation (AF), left atrial diameter (LAD) and low voltage area (LVA) are intermediate phenotypes that are associated with AF type and progression. In this study, we tested the hypothesis, that these phenotypes share common, genetically-determined pathways using pathway enrichment analysis of GWAS data. Samples from 660 patients with paroxysmal (n = 370) or persistent AF (n = 290) were genotyped for ~1,000,000 SNPs. SNPs found significantly associated with LAD, LVA or AF type were used for gene-based association tests in a systematic biological Knowledge-based mining system for Genome-wide Genetic studies (KGG)...
November 18, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27824142/gene-gene-interaction-analyses-for-atrial-fibrillation
#7
Honghuang Lin, Martina Mueller-Nurasyid, Albert V Smith, Dan E Arking, John Barnard, Traci M Bartz, Kathryn L Lunetta, Kurt Lohman, Marcus E Kleber, Steven A Lubitz, Bastiaan Geelhoed, Stella Trompet, Maartje N Niemeijer, Tim Kacprowski, Daniel I Chasman, Derek Klarin, Moritz F Sinner, Melanie Waldenberger, Thomas Meitinger, Tamara B Harris, Lenore J Launer, Elsayed Z Soliman, Lin Y Chen, Jonathan D Smith, David R Van Wagoner, Jerome I Rotter, Bruce M Psaty, Zhijun Xie, Audrey E Hendricks, Jingzhong Ding, Graciela E Delgado, Niek Verweij, Pim van der Harst, Peter W Macfarlane, Ian Ford, Albert Hofman, André Uitterlinden, Jan Heeringa, Oscar H Franco, Jan A Kors, Stefan Weiss, Henry Völzke, Lynda M Rose, Pradeep Natarajan, Sekar Kathiresan, Stefan Kääb, Vilmundur Gudnason, Alvaro Alonso, Mina K Chung, Susan R Heckbert, Emelia J Benjamin, Yongmei Liu, Winfried März, Michiel Rienstra, J Wouter Jukema, Bruno H Stricker, Marcus Dörr, Christine M Albert, Patrick T Ellinor
Atrial fibrillation (AF) is a heritable disease that affects more than thirty million individuals worldwide. Extensive efforts have been devoted to the study of genetic determinants of AF. The objective of our study is to examine the effect of gene-gene interaction on AF susceptibility. We performed a large-scale association analysis of gene-gene interactions with AF in 8,173 AF cases, and 65,237 AF-free referents collected from 15 studies for discovery. We examined putative interactions between genome-wide SNPs and 17 known AF-related SNPs...
November 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27816405/atrial-flutter-fibrillation-in-patients-receiving-transcatheter-closure-of-atrial-septal-defect
#8
Shuenn-Nan Chiu, Mei-Hwan Wu, Chia-Ti Tsai, Ling-Ping Lai, Jiunn-Lee Lin, Ming-Tai Lin, Chun-Wei Lu, Jou-Kou Wang
BACKGROUND/PURPOSE: Atrial flutter/fibrillation (AFL/Af) is a common late complication in atrial septal defect (ASD) patients even after occluder implantation. We try to delineate the risk factors of persistent AFL/Af. METHODS: From 1998 to 2010, all patients older than 18 years of age who received ASD occluder implantation in our hospital were enrolled, and their records were retrospectively reviewed. In addition, renin-angiotensin system gene polymorphisms including angiotensinogen gene, A1166C polymorphism on the angiotensin II type I receptor gene, and insertion/deletion (I/D) patterns on the angiotensin-converting enzyme gene were checked using direct sequencing...
November 2, 2016: Journal of the Formosan Medical Association, Taiwan Yi Zhi
https://www.readbyqxmd.com/read/27813566/association-between-44g-a-and-71a-g-polymorphisms-in-the-connexin-40-gene-and-atrial-fibrillation-in-uyghur-and-han-populations-in-xinjiang-china
#9
J Hailati, Y C Yang, L Zhang, P Y He, M Baikeyi, W Muhuyati, Z Q Liu
We aimed to elucidate the association between connexin 40 (Cx40) genetic polymorphisms and atrial fibrillation (AF) in a Chinese population in Xinjiang comprising Uyghur and Han individuals. We enrolled 275 Uyghur and 305 age- and gender-matched Han subjects, and used polymerase chain reaction to detect single nucleotide polymorphisms (SNPs; -44G/A and +71A/G) in the gene encoding Cx40. A mutation screening was performed by direct sequencing and calculation of genotype and allele frequencies among AF patients and control subjects to determine the relationship between these variants and this condition in Uyghur and Han populations...
October 17, 2016: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/27804874/a-focused-review-of-gender-differences-in-antithrombotic-therapy
#10
Andrea Salzano, Pablo Demelo-Rodriguez, Alberto Maria Marra, Marco Proietti
BACKGROUND: The biological differences among male and female, based on distinctive expression of sex chromosomes, on varied gene-expression and on peculiar sexual hormones, lead to important differences in physiology and pathophysiology. OBJECTIVE: The aim of this work was to briefly review the relationships among gender-related differences and clinical implications in antithrombotic therapy, that could be related to sex-differences in platelet biology and coagulation reactions...
October 29, 2016: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/27799272/wide-variation-in-reported-rates-of-stroke-across-cohorts-of-patients-with-atrial-fibrillation
#11
Gene R Quinn, Olivia N Severdija, Yuchiao Chang, Daniel E Singer
BACKGROUND: -Oral anticoagulants (OAC) decrease ischemic stroke rates in patients with atrial fibrillation (AF) but increase the risk of bleeding. For the average AF patient, the threshold of annual ischemic stroke rate where the benefit of anticoagulation outweighs the bleeding risk (net clinical benefit) has been shown to be approximately 1-2%. Guideline recommendations for OAC in AF are based on the CHA2DS2-VASc stroke risk point scores, assuming that those scores translate to fixed stroke rates...
October 31, 2016: Circulation
https://www.readbyqxmd.com/read/27776716/assessment-of-apelin-serum-levels-in-persistent-atrial-fibrillation-and-coronary-artery-disease
#12
Mehrnaz Riazian, Elnaz Khorrami, Elham Alipoor, Sina Moradmand, Mehdi Yaseri, Mohammad Javad Hosseinzadeh-Attar
BACKGROUND: Apelin, the endogenous ligand of orphan receptor APJ (gene symbol APLNR), is an adipokine that was suggested to have a direct correlation with obesity. This peptide might play a role in obesity-related disorders, especially in the cardiovascular system. Currently, few data are available on levels and potential metabolic functions of apelin in different cardiac diseases including atrial fibrillation (AF) and coronary artery disease (CAD), which have common underlying pathophysiological mechanisms...
October 2016: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/27775682/association-between-rs3807989-polymorphism-in-caveolin-1-cav1-gene-and-atrial-fibrillation-a-meta-analysis
#13
Wenjun Jia, Xin Qi, Qi Li
BACKGROUND Atrial fibrillation (AF) is the most common sustained arrhythmia affected by multiple cardiovascular risk factors. It is reported that caveolin-1 gene (CAV1) rs3807989 polymorphism might be associated with AF risk. The goal of this meta-analysis was to confirm the association between CAV1 rs3807989 polymorphism and susceptibility to AF. MATERIAL AND METHODS We carried out a comprehensive literature search through the electronic databases PubMed, MEDLIN, and Web of Science. We performed a meta-analysis of all selected studies based on CAV1 rs3807989 polymorphism genotypes, including 3758 cases and 6126 controls...
October 24, 2016: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/27765191/pitx2-modulates-atrial-membrane-potential-and-the-antiarrhythmic-effects%C3%A2-of%C3%A2-sodium-channel-blockers
#14
Fahima Syeda, Andrew P Holmes, Ting Y Yu, Samantha Tull, Stefan Michael Kuhlmann, Davor Pavlovic, Daniel Betney, Genna Riley, Jan P Kucera, Florian Jousset, Joris R de Groot, Stephan Rohr, Nigel A Brown, Larissa Fabritz, Paulus Kirchhof
BACKGROUND: Antiarrhythmic drugs are widely used to treat patients with atrial fibrillation (AF), but the mechanisms conveying their variable effectiveness are not known. Recent data suggested that paired like homeodomain-2 transcription factor (PITX2) might play an important role in regulating gene expression and electrical function of the adult left atrium (LA). OBJECTIVES: After determining LA PITX2 expression in AF patients requiring rhythm control therapy, the authors assessed the effects of Pitx2c on LA electrophysiology and the effect of antiarrhythmic drugs...
October 25, 2016: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/27756709/gain-of-function-mutations-in-gata6-lead-to-atrial-fibrillation
#15
Nathan R Tucker, Saagar Mahida, Jiangchuan Ye, Elizabeth J Abraham, Julie A Mina, Victoria A Parsons, Michael A McLellan, Marisa A Shea, Alan Hanley, Emelia J Benjamin, David J Milan, Honghuang Lin, Patrick T Ellinor
BACKGROUND: The genetic basis of atrial fibrillation (AF) and congenital heart disease remains incompletely understood. OBJECTIVE: We sought to determine the causative mutation in a family with AF, atrial septal and ventricular septal defects. METHODS: We evaluated a pedigree with 16 family members, one with an atrial septal defect, one with a ventricular septal defect and three with AF; we performed whole exome sequencing in three affected family members...
October 15, 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/27753830/sy-03-3-overview-of-somatic-mutations-and-epigenetic-regulation-of-aldosterone-producing-adenoma-apa
#16
Satoshi Umemura
Primary aldosteronism (PA) is a heterogeneous group of disorders including both sporadic and familial forms (familial hyperaldosteronism type I, II and III). PA is the most frequent endocrine cause of secondary hypertension and associated with a higher rate of cardiovascular complications, compared with essential hypertension.Here I review the recent progress in understanding of the genetic and molecular mechanisms leading to autonomous aldosterone production in PA.Systematic screening detects primary aldosteronism in 5 to 10% of all patients with hypertension and in approximately 20% of patients with resistant hypertension...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27742809/a-frameshift-deletion-in-the-sarcomere-gene-myl4-causes-early-onset-familial-atrial-fibrillation
#17
Daniel F Gudbjartsson, Hilma Holm, Patrick Sulem, Gisli Masson, Asmundur Oddsson, Olafur Th Magnusson, Jona Saemundsdottir, Hafdis Th Helgadottir, Hannes Helgason, Hrefna Johannsdottir, Solveig Gretarsdottir, Sigurjon A Gudjonsson, Inger Njølstad, Maja-Lisa Løchen, Larry Baum, Ronald C W Ma, Gunnlaugur Sigfusson, Augustine Kong, Guðmundur Thorgeirsson, Jon Th Sverrisson, Unnur Thorsteinsdottir, Kari Stefansson, David O Arnar
AIMS: Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia in man, causing substantial morbidity and mortality with a major worldwide public health impact. It is increasingly recognized as a highly heritable condition. This study aimed to determine genetic risk factors for early-onset AF. METHODS AND RESULTS: We sequenced the whole genomes of 8453 Icelanders and imputed genotypes of the 25.5 million sequence variants we discovered into 1799 Icelanders with early-onset AF (diagnosed before 60 years of age) and 337 453 controls...
October 14, 2016: European Heart Journal
https://www.readbyqxmd.com/read/27741483/cardiovascular-disease-in-patients-with-osteogenesis-imperfecta-a-nationwide-register-based-cohort-study
#18
Lars Folkestad, Jannie Dahl Hald, Jeppe Gram, Bente L Langdahl, Anne Pernille Hermann, Axel Cp Diederichsen, Bo Abrahamsen, Kim Brixen
BACKGROUND: Osteogenesis imperfecta (OI) is a hereditary connective tissue disease often due to mutations in genes coding for type 1 collagen. Collagen type 1 is important in the development of the heart and vasculature. Little is known about the risk of cardiovascular disease (CVD) in OI. OBJECTIVE: To investigate the risk of symptomatic CVD in OI. DESIGN: A Danish nationwide, population-based and register-based longitudinal open cohort study...
September 30, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27713600/association-of-single-nucleotide-polymorphisms-with-atrial-fibrillation-and-the-outcome-after-catheter-ablation
#19
Yu-Feng Hu, Hsueh-Hsiao Wang, Hung-I Yeh, Kun-Tai Lee, Yenn-Jiang Lin, Shih-Lin Chang, Li-Wei Lo, Ta-Chuan Tuan, Cheng-Hung Li, Tze-Fan Chao, Fa-Po Chung, Jo-Nan Liao, Paul Wei Hua Tang, Wei-Chung Tsai, Chuen-Wang Chiou, Shih-Ann Chen
BACKGROUND: The association of gene variants with atrial fibrillation (AF) type and the recurrence of AF after catheter ablation in Taiwan is still unclear. In this study, we aimed to investigate the relationships between gene variants, AF type, and the recurrence of AF. METHODS: In our investigation, we examined 383 consecutive patients with AF (61.9 ± 14.0 years; 63% men); of these 383 patients, 189 underwent catheter ablation for drug-refractory AF. Thereafter, the single nucleotide polymorphisms rs2200733, and rs7193343 were genotyped using real-time polymerase chain reaction...
September 2016: Acta Cardiologica Sinica
https://www.readbyqxmd.com/read/27662649/the-impact-of-cyp4f2-abcb1-and-ggcx-polymorphisms-on-bleeding-episodes-associated-with-acenocoumarol-in-russian-patients-with-atrial-fibrillation
#20
Dmitriy Alexeyevich Sychev, Aleksandr Vladimirovich Rozhkov, Ruslan Evgenyevich Kazakov, Anna Viktorovna Ananichuk
BACKGROUND: Oral anticoagulants are commonly used to treat patients with thromboembolic pathology. Genetic variations could influence personal response to anticoagulant drugs. Acenocoumarol (AC) is a vitamin K antagonist used in anticoagulant therapy and as a prophylaxis measure in Europe. In this study, we assessed the effect of CYP4F2 rs2108622, ABCB1, and GGCX polymorphisms on the safety profile and regime dosing of AC in patients with nonvalvular atrial fibrillation. METHODS: Fifty patients aged 40-70 years were included...
September 1, 2016: Drug Metabolism and Personalized Therapy
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