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Christine seidman

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https://www.readbyqxmd.com/read/29316444/force-generation-via-%C3%AE-cardiac-myosin-titin-and-%C3%AE-actinin-drives-cardiac-sarcomere-assembly-from-cell-matrix-adhesions
#1
Anant Chopra, Matthew L Kutys, Kehan Zhang, William J Polacheck, Calvin C Sheng, Rebeccah J Luu, Jeroen Eyckmans, J Travis Hinson, Jonathan G Seidman, Christine E Seidman, Christopher S Chen
Truncating mutations in the sarcomere protein titin cause dilated cardiomyopathy due to sarcomere insufficiency. However, it remains mechanistically unclear how these mutations decrease sarcomere content in cardiomyocytes. Utilizing human induced pluripotent stem cell-derived cardiomyocytes, CRISPR/Cas9, and live microscopy, we characterize the fundamental mechanisms of human cardiac sarcomere formation. We observe that sarcomerogenesis initiates at protocostameres, sites of cell-extracellular matrix adhesion, where nucleation and centripetal assembly of α-actinin-2-containing fibers provide a template for the fusion of Z-disk precursors, Z bodies, and subsequent striation...
January 8, 2018: Developmental Cell
https://www.readbyqxmd.com/read/29183906/cardiac-enriched-baf-chromatin-remodeling-complex-subunit-baf60c-regulates-gene-expression-programs-essential-for-heart-development-and-function
#2
Xin Sun, Swetansu K Hota, Yu-Qing Zhou, Stefanie Novak, Dario Miguel-Perez, Danos Christodoulou, Christine E Seidman, J G Seidman, Carol C Gregorio, R Mark Henkelman, Janet Rossant, Benoit G Bruneau
How chromatin-remodeling complexes modulate gene networks to control organ-specific properties is not well understood. For example, Baf60c (Smarcd3) encodes a cardiac-enriched subunit of the SWI/SNF-like BAF chromatin complex, but its role in heart development is not fully understood. We found that constitutive loss of Baf60c leads to embryonic cardiac hypoplasia and pronounced cardiac dysfunction. Conditional deletion of Baf60c in cardiomyocytes resulted in postnatal dilated cardiomyopathy with impaired contractile function...
November 28, 2017: Biology Open
https://www.readbyqxmd.com/read/29160304/il11-is-a-crucial-determinant-of-cardiovascular-fibrosis
#3
Sebastian Schafer, Sivakumar Viswanathan, Anissa A Widjaja, Wei-Wen Lim, Aida Moreno-Moral, Daniel M DeLaughter, Benjamin Ng, Giannino Patone, Kingsley Chow, Ester Khin, Jessie Tan, Sonia P Chothani, Lei Ye, Owen J L Rackham, Nicole S J Ko, Norliza E Sahib, Chee Jian Pua, Nicole T G Zhen, Chen Xie, Mao Wang, Henrike Maatz, Shiqi Lim, Kathrin Saar, Susanne Blachut, Enrico Petretto, Sabine Schmidt, Tracy Putoczki, Nuno Guimarães-Camboa, Hiroko Wakimoto, Sebastiaan van Heesch, Kristmundur Sigmundsson, See L Lim, Jia L Soon, Victor T T Chao, Yeow L Chua, Teing E Tan, Sylvia M Evans, Yee J Loh, Muhammad H Jamal, Kim K Ong, Kim C Chua, Boon-Hean Ong, Mathew J Chakaramakkil, Jonathan G Seidman, Christine E Seidman, Norbert Hubner, Kenny Y K Sin, Stuart A Cook
Fibrosis is a final common pathology in cardiovascular disease(1). In the heart, fibrosis causes mechanical and electrical dysfunction(1,2) and in the kidney, it predicts the onset of renal failure(3). Transforming growth factor β1 (TGFB1) is the principal pro-fibrotic factor(4,5) but its inhibition is associated with side effects due to its pleiotropic roles(6,7). We hypothesised that downstream effectors of TGFB1 in fibroblasts could be attractive therapeutic targets and lack upstream toxicities. Using integrated imaging-genomics analyses of primary human fibroblasts, we found that Interleukin 11 (IL11) upregulation is the dominant transcriptional response to TGFB1 exposure and required for its profibrotic effect...
November 13, 2017: Nature
https://www.readbyqxmd.com/read/29073106/cardiovascular-homeostasis-dependence-on-micu2-a-regulatory-subunit-of-the-mitochondrial-calcium-uniporter
#4
Alexander G Bick, Hiroko Wakimoto, Kimberli J Kamer, Yasemin Sancak, Olga Goldberger, Anna Axelsson, Daniel M DeLaughter, Joshua M Gorham, Vamsi K Mootha, J G Seidman, Christine E Seidman
Comparative analyses of transcriptional profiles from humans and mice with cardiovascular pathologies revealed consistently elevated expression of MICU2, a regulatory subunit of the mitochondrial calcium uniporter complex. To determine if MICU2 expression was cardioprotective, we produced and characterized Micu2-/- mice. Mutant mice had left atrial enlargement and Micu2-/- cardiomyocytes had delayed sarcomere relaxation and cytosolic calcium reuptake kinetics, indicating diastolic dysfunction. RNA sequencing (RNA-seq) of Micu2-/- ventricular tissues revealed markedly reduced transcripts encoding the apelin receptor (Micu2-/- vs...
October 24, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29038206/closing-the-genotype-phenotype-loop-for-precision-medicine
#5
EDITORIAL
Calum A MacRae, Christine E Seidman
No abstract text is available yet for this article.
October 17, 2017: Circulation
https://www.readbyqxmd.com/read/29030401/a-comparison-of-whole-genome-sequencing-to-multigene-panel-testing-in-hypertrophic-cardiomyopathy-patients
#6
Allison L Cirino, Neal K Lakdawala, Barbara McDonough, Lauren Conner, Dale Adler, Mark Weinfeld, Patrick O'Gara, Heidi L Rehm, Kalotina Machini, Matthew Lebo, Carrie Blout, Robert C Green, Calum A MacRae, Christine E Seidman, Carolyn Y Ho
BACKGROUND: As DNA sequencing costs decline, genetic testing options have expanded. Whole exome sequencing and whole genome sequencing (WGS) are entering clinical use, posing questions about their incremental value compared with disease-specific multigene panels that have been the cornerstone of genetic testing. METHODS AND RESULTS: Forty-one patients with hypertrophic cardiomyopathy who had undergone targeted hypertrophic cardiomyopathy genetic testing (either multigene panel or familial variant test) were recruited into the MedSeq Project, a clinical trial of WGS...
October 2017: Circulation. Cardiovascular Genetics
https://www.readbyqxmd.com/read/28991257/contribution-of-rare-inherited-and-de-novo-variants-in-2-871-congenital-heart-disease-probands
#7
Sheng Chih Jin, Jason Homsy, Samir Zaidi, Qiongshi Lu, Sarah Morton, Steven R DePalma, Xue Zeng, Hongjian Qi, Weni Chang, Michael C Sierant, Wei-Chien Hung, Shozeb Haider, Junhui Zhang, James Knight, Robert D Bjornson, Christopher Castaldi, Irina R Tikhonoa, Kaya Bilguvar, Shrikant M Mane, Stephan J Sanders, Seema Mital, Mark W Russell, J William Gaynor, John Deanfield, Alessandro Giardini, George A Porter, Deepak Srivastava, Cecelia W Lo, Yufeng Shen, W Scott Watkins, Mark Yandell, H Joseph Yost, Martin Tristani-Firouzi, Jane W Newburger, Amy E Roberts, Richard Kim, Hongyu Zhao, Jonathan R Kaltman, Elizabeth Goldmuntz, Wendy K Chung, Jonathan G Seidman, Bruce D Gelb, Christine E Seidman, Richard P Lifton, Martina Brueckner
Congenital heart disease (CHD) is the leading cause of mortality from birth defects. Here, exome sequencing of a single cohort of 2,871 CHD probands, including 2,645 parent-offspring trios, implicated rare inherited mutations in 1.8%, including a recessive founder mutation in GDF1 accounting for ∼5% of severe CHD in Ashkenazim, recessive genotypes in MYH6 accounting for ∼11% of Shone complex, and dominant FLT4 mutations accounting for 2.3% of Tetralogy of Fallot. De novo mutations (DNMs) accounted for 8% of cases, including ∼3% of isolated CHD patients and ∼28% with both neurodevelopmental and extra-cardiac congenital anomalies...
November 2017: Nature Genetics
https://www.readbyqxmd.com/read/28798024/fabry-disease-in-families-with-hypertrophic-cardiomyopathy-clinical-manifestations-in-the-classic-and-later-onset-phenotypes
#8
Berglind Adalsteinsdottir, Runolfur Palsson, Robert J Desnick, Marianna Gardarsdottir, Polakit Teekakirikul, Martin Maron, Evan Appelbaum, Ulf Neisius, Barry J Maron, Michael A Burke, Brenden Chen, Silvere Pagant, Christoffer V Madsen, Ragnar Danielsen, Reynir Arngrimsson, Ulla Feldt-Rasmussen, Jonathan G Seidman, Christine E Seidman, Gunnar Th Gunnarsson
BACKGROUND: The screening of Icelandic patients clinically diagnosed with hypertrophic cardiomyopathy resulted in identification of 8 individuals from 2 families with X-linked Fabry disease (FD) caused by GLA(α-galactosidase A gene) mutations encoding p.D322E (family A) or p.I232T (family B). METHODS AND RESULTS: Familial screening of at-risk relatives identified mutations in 16 family A members (8 men and 8 heterozygotes) and 25 family B members (10 men and 15 heterozygotes)...
August 2017: Circulation. Cardiovascular Genetics
https://www.readbyqxmd.com/read/28687077/joint-analysis-of-left-ventricular-expression-and-circulating-plasma-levels-of-omentin-after-myocardial-ischemia
#9
Louis A Saddic, Sarah M Nicoloro, Olga T Gupta, Michael P Czech, Joshua Gorham, Stanton K Shernan, Christine E Seidman, Jon G Seidman, Sary F Aranki, Simon C Body, Timothy P Fitzgibbons, Jochen D Muehlschlegel
BACKGROUND: Omentin-1, also known as Intelectin-1 (ITLN1), is an adipokine with plasma levels associated with diabetes, obesity, and coronary artery disease. Recent studies suggest that ITLN1 can mitigate myocardial ischemic injury but the expression of ITLN1 in the heart itself has not been well characterized. The purpose of this study is to discern the relationship between the expression pattern of ITLN1 RNA in the human heart and the level of circulating ITLN1 protein in plasma from the same patients following myocardial ischemia...
July 7, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/28679633/identification-of-pathogenic-gene-mutations-in-lmna-and-mybpc3-that-alter-rna-splicing
#10
Kaoru Ito, Parth N Patel, Joshua M Gorham, Barbara McDonough, Steven R DePalma, Emily E Adler, Lien Lam, Calum A MacRae, Syed M Mohiuddin, Diane Fatkin, Christine E Seidman, J G Seidman
Genetic variants that cause haploinsufficiency account for many autosomal dominant (AD) disorders. Gene-based diagnosis classifies variants that alter canonical splice signals as pathogenic, but due to imperfect understanding of RNA splice signals other variants that may create or eliminate splice sites are often clinically classified as variants of unknown significance (VUS). To improve recognition of pathogenic splice-altering variants in AD disorders, we used computational tools to prioritize VUS and developed a cell-based minigene splicing assay to confirm aberrant splicing...
July 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28652256/fundamental-cardiovascular-research-returns-on-societal-investment-a-scientific-statement-from-the-american-heart-association
#11
REVIEW
Joseph A Hill, Reza Ardehali, Kimberli Taylor Clarke, Gregory J Del Zoppo, Lee L Eckhardt, Kathy K Griendling, Peter Libby, Dan M Roden, Hesham A Sadek, Christine E Seidman, Douglas E Vaughan
Recent decades have witnessed robust successes in conquering the acutely lethal manifestations of heart and vascular diseases. Many patients who previously would have died now survive. Lifesaving successes like these provide a tremendous and easily recognized benefit to individuals and society. Although cardiovascular mortality has declined, the devastating impact of chronic heart disease and comorbidities on quality of life and healthcare resources continues unabated. Future strides, extending those made in recent decades, will require continued research into mechanisms underlying disease prevention, pathogenesis, progression, and therapeutic intervention...
July 21, 2017: Circulation Research
https://www.readbyqxmd.com/read/28614725/integrative-analysis-of-prkag2-cardiomyopathy-ips-and-microtissue-models-identifies-ampk-as-a-regulator-of-metabolism-survival-and-fibrosis
#12
J Travis Hinson, Anant Chopra, Andre Lowe, Calvin C Sheng, Rajat M Gupta, Rajarajan Kuppusamy, John O'Sullivan, Glenn Rowe, Hiroko Wakimoto, Joshua Gorham, Michael A Burke, Kehan Zhang, Kiran Musunuru, Robert E Gerszten, Sean M Wu, Christopher S Chen, Jonathan G Seidman, Christine E Seidman
No abstract text is available yet for this article.
June 13, 2017: Cell Reports
https://www.readbyqxmd.com/read/28606303/effects-of-myosin-variants-on-interacting-heads-motif-explain-distinct-hypertrophic-and-dilated-cardiomyopathy-phenotypes
#13
Lorenzo Alamo, James S Ware, Antonio Pinto, Richard E Gillilan, Jonathan G Seidman, Christine E Seidman, Raúl Padrón
Cardiac β-myosin variants cause hypertrophic (HCM) or dilated (DCM) cardiomyopathy by disrupting sarcomere contraction and relaxation. The locations of variants on isolated myosin head structures predict contractility effects but not the prominent relaxation and energetic deficits that characterize HCM. During relaxation, pairs of myosins form interacting-heads motif (IHM) structures that with other sarcomere proteins establish an energy-saving, super-relaxed (SRX) state. Using a human β-cardiac myosin IHM quasi-atomic model, we defined interactions sites between adjacent myosin heads and associated protein partners, and then analyzed rare variants from 6112 HCM and 1315 DCM patients and 33,370 ExAC controls...
June 13, 2017: ELife
https://www.readbyqxmd.com/read/28596995/cardiac-myosin-binding-protein-c-autoantibodies-are-potential-early-indicators-of-cardiac-dysfunction-and-patient-outcome-in-acute-coronary-syndrome
#14
Thomas L Lynch, Diederik W D Kuster, Beverly Gonzalez, Neelam Balasubramanian, Nandini Nair, Sharlene Day, Jenna E Calvino, Yanli Tan, Christoph Liebetrau, Christian Troidl, Christian W Hamm, Ahmet Güçlü, Barbara McDonough, Ali J Marian, Jolanda van der Velden, Christine E Seidman, Gordon S Huggins, Sakthivel Sadayappan
The degradation and release of cardiac myosin binding protein-C (cMyBP-C) upon cardiac damage may stimulate an inflammatory response and autoantibody (AAb) production. We determined whether the presence of cMyBP-C-AAbs associated with adverse cardiac function in CVD patients. Importantly, cMyBP-C-AAbs were significantly detected in ACS patient sera upon arrival to the emergency department, particularly in STEMI patients. Patients positive for cMyBP-C-AAbs had a reduced LVEF and elevated levels of clinical biomarkers of MI...
April 2017: JACC. Basic to Translational Science
https://www.readbyqxmd.com/read/28431249/macrophages-facilitate-electrical-conduction-in-the-heart
#15
Maarten Hulsmans, Sebastian Clauss, Ling Xiao, Aaron D Aguirre, Kevin R King, Alan Hanley, William J Hucker, Eike M Wülfers, Gunnar Seemann, Gabriel Courties, Yoshiko Iwamoto, Yuan Sun, Andrej J Savol, Hendrik B Sager, Kory J Lavine, Gregory A Fishbein, Diane E Capen, Nicolas Da Silva, Lucile Miquerol, Hiroko Wakimoto, Christine E Seidman, Jonathan G Seidman, Ruslan I Sadreyev, Kamila Naxerova, Richard N Mitchell, Dennis Brown, Peter Libby, Ralph Weissleder, Filip K Swirski, Peter Kohl, Claudio Vinegoni, David J Milan, Patrick T Ellinor, Matthias Nahrendorf
Organ-specific functions of tissue-resident macrophages in the steady-state heart are unknown. Here, we show that cardiac macrophages facilitate electrical conduction through the distal atrioventricular node, where conducting cells densely intersperse with elongated macrophages expressing connexin 43. When coupled to spontaneously beating cardiomyocytes via connexin-43-containing gap junctions, cardiac macrophages have a negative resting membrane potential and depolarize in synchrony with cardiomyocytes. Conversely, macrophages render the resting membrane potential of cardiomyocytes more positive and, according to computational modeling, accelerate their repolarization...
April 20, 2017: Cell
https://www.readbyqxmd.com/read/28340351/bedside-back-to-bench-building-bridges-between-basic-and-clinical-genomic-research
#16
Teri A Manolio, Douglas M Fowler, Lea M Starita, Melissa A Haendel, Daniel G MacArthur, Leslie G Biesecker, Elizabeth Worthey, Rex L Chisholm, Eric D Green, Howard J Jacob, Howard L McLeod, Dan Roden, Laura Lyman Rodriguez, Marc S Williams, Gregory M Cooper, Nancy J Cox, Gail E Herman, Stephen Kingsmore, Cecilia Lo, Cathleen Lutz, Calum A MacRae, Robert L Nussbaum, Jose M Ordovas, Erin M Ramos, Peter N Robinson, Wendy S Rubinstein, Christine Seidman, Barbara E Stranger, Haoyi Wang, Monte Westerfield, Carol Bult
Genome sequencing has revolutionized the diagnosis of genetic diseases. Close collaborations between basic scientists and clinical genomicists are now needed to link genetic variants with disease causation. To facilitate such collaborations, we recommend prioritizing clinically relevant genes for functional studies, developing reference variant-phenotype databases, adopting phenotype description standards, and promoting data sharing.
March 23, 2017: Cell
https://www.readbyqxmd.com/read/28296976/exome-wide-association-study-reveals-novel-susceptibility-genes-to-sporadic-dilated-cardiomyopathy
#17
Ulrike Esslinger, Sophie Garnier, Agathe Korniat, Carole Proust, Georgios Kararigas, Martina Müller-Nurasyid, Jean-Philippe Empana, Michael P Morley, Claire Perret, Klaus Stark, Alexander G Bick, Sanjay K Prasad, Jennifer Kriebel, Jin Li, Laurence Tiret, Konstantin Strauch, Declan P O'Regan, Kenneth B Marguiles, Jonathan G Seidman, Pierre Boutouyrie, Patrick Lacolley, Xavier Jouven, Christian Hengstenberg, Michel Komajda, Hakon Hakonarson, Richard Isnard, Eloisa Arbustini, Harald Grallert, Stuart A Cook, Christine E Seidman, Vera Regitz-Zagrosek, Thomas P Cappola, Philippe Charron, François Cambien, Eric Villard
AIMS: Dilated cardiomyopathy (DCM) is an important cause of heart failure with a strong familial component. We performed an exome-wide array-based association study (EWAS) to assess the contribution of missense variants to sporadic DCM. METHODS AND RESULTS: 116,855 single nucleotide variants (SNVs) were analyzed in 2796 DCM patients and 6877 control subjects from 6 populations of European ancestry. We confirmed two previously identified associations with SNVs in BAG3 and ZBTB17 and discovered six novel DCM-associated loci (Q-value<0...
2017: PloS One
https://www.readbyqxmd.com/read/28241245/the-burden-of-early-phenotypes-and-the-influence-of-wall-thickness-in-hypertrophic-cardiomyopathy-mutation-carriers-findings-from-the-hcmnet-study
#18
Carolyn Y Ho, Sharlene M Day, Steven D Colan, Mark W Russell, Jeffrey A Towbin, Mark V Sherrid, Charles E Canter, John L Jefferies, Anne M Murphy, Allison L Cirino, Theodore P Abraham, Matthew Taylor, Luisa Mestroni, David A Bluemke, Petr Jarolim, Ling Shi, Lynn A Sleeper, Christine E Seidman, E John Orav
Importance: Sarcomere mutations and left ventricular (LV) hypertrophy (LVH) are cardinal features of hypertrophic cardiomyopathy (HCM). However, little is known about the full spectrum of phenotypic manifestations or how LVH influences disease expression. Objectives: (1) To characterize and assess phenotypic burden in sarcomere mutation carriers (genotype positive [G+]) and (2) to investigate the correlation between LV wall thickness (LVWT) and other disease features in mutation carriers...
April 1, 2017: JAMA Cardiology
https://www.readbyqxmd.com/read/28115490/the-long-noncoding-rna-landscape-of-the-ischemic-human-left-ventricle
#19
Louis A Saddic, Martin I Sigurdsson, Tzuu-Wang Chang, Erica Mazaika, Mahyar Heydarpour, Stanton K Shernan, Christine E Seidman, Jon G Seidman, Sary F Aranki, Simon C Body, Jochen D Muehlschlegel
BACKGROUND: The discovery of functional classes of long noncoding RNAs (lncRNAs) has expanded our understanding of the variety of RNA species that exist in cells. In the heart, lncRNAs have been implicated in the regulation of development, ischemic and dilated cardiomyopathy, and myocardial infarction. Nevertheless, there is a limited description of expression profiles for these transcripts in human subjects. METHODS AND RESULTS: We obtained left ventricular tissue from human patients undergoing cardiac surgery and used RNA sequencing to describe an lncRNA profile...
January 2017: Circulation. Cardiovascular Genetics
https://www.readbyqxmd.com/read/28089740/early-remodeling-of-repolarizing-k-currents-in-the-%C3%AE-mhc-403-mouse-model-of-familial-hypertrophic-cardiomyopathy
#20
Rocco Hueneke, Adam Adenwala, Rebecca L Mellor, Jonathan G Seidman, Christine E Seidman, Jeanne M Nerbonne
Familial hypertrophic cardiomyopathy (HCM), linked to mutations in myosin, myosin-binding proteins and other sarcolemmal proteins, is associated with increased risk of life threatening ventricular arrhythmias, and a number of animal models have been developed to facilitate analysis of disease progression and mechanisms. In the experiments here, we use the αMHC(403/+) mouse line in which one αMHC allele harbors a common HCM mutation (in βMHC, Arg403 Gln). Here, we demonstrate marked prolongation of QT intervals in young adult (10-12week) male αMHC(403/+) mice, well in advance of the onset of measurable left ventricular hypertrophy...
February 2017: Journal of Molecular and Cellular Cardiology
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