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Atrial Fibrillation Genes

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https://www.readbyqxmd.com/read/28933293/micrornas-in-atrial-fibrillation
#1
Alexandros Briasoulis, Shikha Sharma, Tesfaye Telila, Sagar Mallikethi-Reddy, Nikolaos Papageorgiou, Evangelos Oikonomou, Dimitris Tousoulis
microRNAs (miRNAs) are small non-coding RNAs, involved in regulation of post-transcriptional gene expression. They exert key role not only in physiology and normal development of the cardiovascular system but also in cardiovascular disease development and progression. Recent animal and human studies of tissue specific miRNAs have suggested a role in structural and electrical remodeling in atrial fibrillation (AF). Their emerging role as biomarkers and potential therapeutic targets in patients with AF is discussed in this review...
September 20, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28928995/acute-unilateral-renal-infarction-in-the-setting-of-an-inherited-thrombophilia-and-atrial-septal-defect
#2
Siavash Piran, Sam Schulman
We present a case of renal infarction in a 43-year-old female with history of stroke at age 14. She was found to be heterozygous for the prothrombin G20210A gene mutation. Loop monitoring revealed no atrial fibrillation. Transthoracic and transesophageal echocardiograms showed no thrombus. However, there was a small shunt due to an atrial septal defect (ASD). She was treated with warfarin and had device closure of her ASD. This was a suspected case of paradoxical embolism through an ASD leading to renal infarction...
2017: Case Reports in Hematology
https://www.readbyqxmd.com/read/28925907/atrial-fibrillation-ablation-increases-inflammation-chemokine-modulation-suppresses-activation-of-leukocytes-isolated-after-ablation
#3
Alexandra Lucas, Mohammad Al-Ani, Sriram Ambadapadi, Jordan R Yaron, Donghang Zheng, Adisson Fortunel, Maia Doroton-Guevara, Liying Liu, Sufi Morshed, Jay Fricker, William Miles, Matthew McKillop
AIMS: Atrial fibrillation (AF) ablation is associated with increased circulating markers of inflammation. Innate immune, or inflammation, pathways up-regulate mononuclear cell responses and may increase risk for recurrent arrhythmia. Chemokines and serine protease coagulation pathways both activate innate immune responses. Here, we measured inflammatory markers in peripheral blood samples from patients after cryoballoon and/or radiofrequency pulmonary vein isolation and assessed the capacity for inhibition of chemokine and serine protease pathways to block cell activation...
September 18, 2017: Cardiovascular & Hematological Disorders Drug Targets
https://www.readbyqxmd.com/read/28915649/digoxin-induced-anemia-among-patients-with-atrial-fibrillation-and-heart-failure-clinical-data-analysis-and-drug-gene-interaction-network
#4
Yubi Lin, Siqi He, Ruiling Feng, Zhe Xu, Wanqun Chen, Zifeng Huang, Yang Liu, Qianhuan Zhang, Bin Zhang, Kejian Wang, Shulin Wu
Digoxin is widely used to treat various heart conditions. In order to clarify the association between digoxin and anemia adverse reaction, we inspected case reports submitted to the FDA Adverse Event Reporting System (FAERS) between January 2004 and December 2015. These reports involved 75618 atrial fibrillation patients and 15699 heart failure patients. Compared to other therapies, digoxin treatment was significantly more likely to be concurrent with anemia adverse reaction among both atrial fibrillation patients (pooled OR = 1...
August 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28912181/hypertrophic-cardiomyopathy-genetics-pathogenesis-clinical-manifestations-diagnosis-and-therapy
#5
REVIEW
Ali J Marian, Eugene Braunwald
Hypertrophic cardiomyopathy (HCM) is a genetic disorder that is characterized by left ventricular hypertrophy unexplained by secondary causes and a nondilated left ventricle with preserved or increased ejection fraction. It is commonly asymmetrical with the most severe hypertrophy involving the basal interventricular septum. Left ventricular outflow tract obstruction is present at rest in about one third of the patients and can be provoked in another third. The histological features of HCM include myocyte hypertrophy and disarray, as well as interstitial fibrosis...
September 15, 2017: Circulation Research
https://www.readbyqxmd.com/read/28902899/selective-autonomic-stimulation-of-the-av-node-fat-pad-to-control-rapid-post-operative-atrial-arrhythmias
#6
Marco A Mercader, Dingchao He, Aditya C Sharma, Mark C Marchitto, Gregory Trachiotis, Gene A Bornzin, Richard Jonas, Jeffrey P Moak
Junctional ectopic tachycardia (JET) and atrial fibrillation (AF) occur in patients recovering from open-heart surgery (OHS). Pharmacologic treatment is used for the control of post-operative atrial arrhythmias (POAA), but is associated with side effects. There is a need for a reversible, modulated solution to rate control. We propose a non-pharmacologic technique that can modulate AV nodal conduction in a selective fashion. Ten mongrel dogs underwent OHS. Stimulation of the anterior right (AR) and inferior right (IR) fat pad (FP) was done using a 7-pole electrode...
2017: PloS One
https://www.readbyqxmd.com/read/28901395/role-of-matrix-metalloproteinase%C3%A2-7-and-apoptosis%C3%A2-associated-gene-expression-levels-in-the-pathogenesis-of-atrial-fibrosis-in-a-beagle-dog-model
#7
Min Jia, Zai-Bo Li, Lin Li, Hong-Tao Chu, Zhuang-Zhuang Li
The aim of the present study was to investigate the potential role of matrix metalloproteinase‑7 (MMP‑7) and apoptosis‑associated genes [TIMP metallopeptidase inhibitor 2(TIMP‑2), BCL2 associated X, apoptosis regulator (BAX) and BCL2, apoptosis regulator (BCL‑2)] in the pathogenesis of atrial fibrillation (AF) in a Beagle dog model. A total of 20 adult male Beagle dogs were randomly assigned into the AF group (n=10; Beagle dogs were treated by Burst stimulation to induce AF) and the control group (n=10; healthy Beagle dogs)...
August 31, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28899000/rhoa-rock-signalling-is-necessary-for-lateralization-and-differentiation-of-the-developing-sinoatrial-node
#8
Rebecca Vicente-Steijn, Tim P Kelder, Leon G Tertoolen, Lambertus J Wisse, Daniël A Pijnappels, Robert E Poelmann, Martin J Schalij, Marco C deRuiter, Adriana C Gittenberger-de Groot, Monique R M Jongbloed
Aims: RHOA-ROCK signalling regulates cell migration, proliferation, differentiation, and transcription. RHOA is expressed in the developing cardiac conduction system in chicken and mice. In early development, the entire sinus venosus myocardium, including both the transient left-sided and the definitive sinoatrial node (SAN), has pacemaker potential. Later, pacemaker potential is restricted to the right-sided SAN. Disruption of RHOA expression in adult mice causes arrhythmias including bradycardia and atrial fibrillation, the mechanism of which is unknown but presumed to affect the SAN...
August 1, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28881845/gender-differences-in-fibrosis-remodeling-in-patients-with-long-standing-persistent-atrial-fibrillation
#9
Zhi Li, Zengwei Wang, Zongtao Yin, Yuji Zhang, Xiaodong Xue, Jinsong Han, Yan Zhu, Jian Zhang, Maximilian Y Emmert, Huishan Wang
The success rate of catheter ablation in atrial fibrillation (AF) is known to be lower in females than in males. However, while the exact mechanism for this phenomenon remains to be elucidated, tissue fibrosis may play an important role in this regard. It has been shown that fibrosis promotes AF and its recurrence, thereby substantially reducing the efficacy of catheter ablation in AF patients. Thus, we hypothesized that fibrosis may contribute to gender differences in the outcomes of AF catheter ablation. Here we systematically assessed pulmonary vein sleeves obtained from 166 patients with and without long-standing persistent-AF (LSP-AF) in order to identify gender-specific mechanistic differences in fibrosis remodeling of AF patients...
August 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/28846808/dna-methylation-dysregulations-in-valvular-atrial-fibrillation
#10
Kangjun Shen, Tao Tu, Zhaoshun Yuan, Jiangfeng Yi, Yangzhao Zhou, Xiaobo Liao, Qiming Liu, Xinmin Zhou
BACKGROUND: The epigenetic changes underlying the development of atrial fibrillation (AF) remain incompletely understood. Limited evidence suggests that abnormal DNA methylation might be involved in the pathogenesis of AF. In the present study, we evaluated the methylation status of genomic DNA from myocardial tissue in AF patients and sinus rhythm (SR) patients systematically. HYPOTHESIS: DNA methylation dysregulations will be associated with valvular AF. METHODS: Right atrial myocardial tissue was obtained from rheumatic valvular patients who had undergone valve replacement surgery (SR group, n = 10; AF group, n = 10)...
August 28, 2017: Clinical Cardiology
https://www.readbyqxmd.com/read/28839241/leukocyte-trp-channel-gene-expressions-in%C3%A2-patients-with-non-valvular-atrial-fibrillation
#11
Irfan V Düzen, Fethi Yavuz, Ertan Vuruskan, Erhan Saracoglu, Fatih Poyraz, Hüseyin Göksülük, Basar Candemir, Seniz Demiryürek
Atrial fibrillation (AF) is the most common arrhythmia in clinical practice and is a major cause of morbidity and mortality. The upregulation of TRP channels is believed to mediate the progression of electrical remodelling and the arrhythmogenesis of the diseased heart. However, there is limited data about the contribution of the TRP channels to development of AF. The aim of this study was to investigate leukocyte TRP channels gene expressions in non-valvular atrial fibrillation (NVAF) patients. The study included 47 NVAF patients and 47 sex and age matched controls...
August 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28837624/rare-variants-in-genes-encoding-the-cardiac-sodium-channel-and-associated-compounds-and-their-impact-on-outcome-of-catheter-ablation-of-atrial-fibrillation
#12
Daniela Husser, Laura Ueberham, Gerhard Hindricks, Petra Büttner, Christie Ingram, Peter Weeke, M Benjamin Shoemaker, Volker Adams, Arash Arya, Philipp Sommer, Dawood Darbar, Dan M Roden, Andreas Bollmann
AIM: Rare variants of genes encoding the cardiac sodium channel and associated compounds have been linked with atrial fibrillation (AF). Nevertheless, current expert consensus does not support genetic testing in AF, which is in part based on the fact that "there is no therapeutic impact derived from AF genetic test results". However, there are no studies available supporting this recommendation. Consequently, this study analyzed the impact of rare variants affecting the cardiac sodium channel on rhythm outcome of AF catheter ablation...
2017: PloS One
https://www.readbyqxmd.com/read/28811460/prevention-of-atrial-fibrillation-by-using-sarcoplasmic-reticulum-calcium-atpase-pump-overexpression-in-a-rabbit-model-of-rapid-atrial-pacing
#13
Hong Li Wang, Xian Hui Zhou, Zhi Qiang Li, Ping Fan, Qi Na Zhou, Yao Dong Li, Yue Mei Hou, Bao Peng Tang
BACKGROUND Recent research suggests that abnormal Ca2+ handling plays a role in the occurrence and maintenance of atrial fibrillation (AF). Therefore, Ca2+ release and ingestion depend on properties of the ryanodine receptor (RyR) and sarcoplasmic reticulum Ca2+ATPase2a (SERCA2a). This study aimed to detect whether SERCA2a gene overexpression has a preventive effect on atrial fibrillation caused by rapid pacing right atrium. MATERIAL AND METHODS Forty-eight New Zealand white rabbits were randomly divided into a control group, AF group, AAV9/GFP group, and AAV9/SERCA2a group...
August 16, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28807550/decreased-gene-expression-of-fatty-acid-binding-protein-3-in-the-atrium-of-patients-with-new-onset-of-atrial-fibrillation-in-cardiac-perioperative-phase
#14
Yasushige Shingu, Takashi Yokota, Shingo Takada, Haruki Niwano, Tomonori Ooka, Hiroki Katoh, Tsuyoshi Tachibana, Suguru Kubota, Yoshiro Matsui
BACKGROUND: Post-operative atrial fibrillation (POAF) frequently occurs after cardiac surgery. However, the mechanisms of POAF have not been fully elucidated. We aimed to examine whether pre-operative atrial gene expression related to cardiac metabolism is changed in patients with POAF. METHODS: Right atrial tissue was obtained during surgery from 38 patients who underwent cardiac surgery from 2013 to 2015. Atrial expression levels were determined by reverse transcription polymerase chain reaction for the following genes: glucose transporter type 4, peroxisome proliferator-activated receptor-α, fatty acid translocase, carnitine palmitoyltransferase 1B, and fatty acid binding protein 3 (FABP3)...
August 11, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28794112/fifteen-genetic-loci-associated-with-the-electrocardiographic-p-wave
#15
Ingrid E Christophersen, Jared W Magnani, Xiaoyan Yin, John Barnard, Lu-Chen Weng, Dan E Arking, Maartje N Niemeijer, Steven A Lubitz, Christy L Avery, Qing Duan, Stephan B Felix, Joshua C Bis, Kathleen F Kerr, Aaron Isaacs, Martina Müller-Nurasyid, Christian Müller, Kari E North, Alex P Reiner, Lesley F Tinker, Jan A Kors, Alexander Teumer, Astrid Petersmann, Moritz F Sinner, Petra Buzkova, Jonathan D Smith, David R Van Wagoner, Uwe Völker, Melanie Waldenberger, Annette Peters, Thomas Meitinger, Marian C Limacher, Kirk C Wilhelmsen, Bruce M Psaty, Albert Hofman, Andre Uitterlinden, Bouwe P Krijthe, Zhu-Ming Zhang, Renate B Schnabel, Stefan Kääb, Cornelia van Duijn, Jerome I Rotter, Nona Sotoodehnia, Marcus Dörr, Yun Li, Mina K Chung, Elsayed Z Soliman, Alvaro Alonso, Eric A Whitsel, Bruno H Stricker, Emelia J Benjamin, Susan R Heckbert, Patrick T Ellinor
BACKGROUND: The P wave on an ECG is a measure of atrial electric function, and its characteristics may serve as predictors for atrial arrhythmias. Increased mean P-wave duration and P-wave terminal force traditionally have been used as markers for left atrial enlargement, and both have been associated with increased risk of atrial fibrillation. Here, we explore the genetic basis of P-wave morphology through meta-analysis of genome-wide association study results for P-wave duration and P-wave terminal force from 12 cohort studies...
August 2017: Circulation. Cardiovascular Genetics
https://www.readbyqxmd.com/read/28765088/the-evolving-role-of-ankyrin-b-in-cardiovascular-disease
#16
Sara N Koenig, Peter J Mohler
Over the past decade, ankyrin-B has been identified as a prominent player in cardiac physiology. Ankyrin-B has a multitude of functions, with roles in expression, localization, and regulation of proteins critical for cardiac excitability, cytoskeletal integrity, and signaling. Furthermore, human ANK2 variants that result in ankyrin-B loss of function are associated with "ankyrin-B syndrome," a complex cardiac phenotype that may include bradycardia and heart rate variability, conduction block, atrial fibrillation, QT interval prolongation, and potentially fatal catecholaminergic polymorphic ventricular tachycardia...
July 29, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28760472/mitochondrial-dysfunction-in-atrial-tissue-of-patients-developing-postoperative-atrial-fibrillation
#17
Jelliffe Jeganathan, Rabya Saraf, Feroze Mahmood, Anam Pal, Manoj K Bhasin, Thomas Huang, Aaron Mittel, Ziyad Knio, Russell Simons, Kamal Khabbaz, Venkatachalam Senthilnathan, David Liu, Frank Sellke, Robina Matyal
BACKGROUND: Mitochondria are the major site of cellular oxidation. Metabolism and oxidative stress have been implicated as possible mechanisms for postoperative atrial fibrillation (POAF) after cardiac operations. Establishing the precise nature of mitochondrial dysfunction as an etiologic factor for oxidative stress-related cell death and apoptosis could further the understanding of POAF. To establish this relationship, mitochondrial function was studied in patients undergoing cardiac operations that developed POAF and compared it with patients without POAF...
July 28, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28752208/micrornas-in-atrial-fibrillation-from-expression-signatures-to-functional-implications
#18
REVIEW
Nicoline W E van den Berg, Makiri Kawasaki, Wouter R Berger, Jolien Neefs, Eva Meulendijks, Anke J Tijsen, Joris R de Groot
Atrial fibrillation (AF) is the most common sustained arrhythmia and is associated with pronounced morbidity and mortality. Its prevalence, expected to further increase for the forthcoming years, and associated frequent hospitalizations turn AF into a major health problem. Structural and electrical atrial remodelling underlie the substrate for AF, but the exact mechanisms driving this remodelling remain incompletely understood. Recent studies have shown that microRNAs (miRNA), short non-coding RNAs that regulate gene expression, may be involved in the pathophysiology of AF...
July 28, 2017: Cardiovascular Drugs and Therapy
https://www.readbyqxmd.com/read/28729840/cardiac-subtype-specific-modeling-of-kv1-5-ion-channel-deficiency-using-human-pluripotent-stem-cells
#19
Maike Marczenke, Ilaria Piccini, Isabella Mengarelli, Jakob Fell, Albrecht Röpke, Guiscard Seebohm, Arie O Verkerk, Boris Greber
The ultrarapid delayed rectifier K(+) current (IKur), mediated by Kv1.5 channels, constitutes a key component of the atrial action potential. Functional mutations in the underlying KCNA5 gene have been shown to cause hereditary forms of atrial fibrillation (AF). Here, we combine targeted genetic engineering with cardiac subtype-specific differentiation of human induced pluripotent stem cells (hiPSCs) to explore the role of Kv1.5 in atrial hiPSC-cardiomyocytes. CRISPR/Cas9-mediated mutagenesis of integration-free hiPSCs was employed to generate a functional KCNA5 knockout...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28725275/ash-meeting-2016-developments-in-hemostaseology
#20
REVIEW
Clemens Feistritzer, Birgit Mosheimer
During the annual meeting of the American Society of Hematology (ASH) in San Diego/California, novel developments in the field of hemostaseology were presented. Alternative treatment strategies besides factor replacement were discussed for patients with hemophilia. One of the highlights of the meeting in this year's plenary session was the presentation of successful adeno-associated virus mediated gene transfer in patients with hemophilia B leading to sustained elevation of factor IX:C (FIX:c). Other alternative treatment approaches in patients with hemophilia A may include bispecific antibodies mimicking factor VIIIa (FVIIIa) activity or disrupting anticoagulant proteins...
2017: Memo
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