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genetic causes of congenital heart disease

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https://www.readbyqxmd.com/read/28803248/a-functional-assay-for-sick-sinus-syndrome-genetic-variants
#1
Chuanchau J Jou, Cammon B Arrington, Spencer Barnett, Jiaxiang Shen, Scott Cho, Xiaoming Sheng, Patrick C McCullagh, Neil E Bowles, Chase M Pribble, Elizabeth V Saarel, Thomas A Pilcher, Susan P Etheridge, Martin Tristani-Firouzi
BACKGROUND/AIMS: Congenital Sick Sinus Syndrome (SSS) is a disorder associated with sudden cardiac death due to severe bradycardia and prolonged pauses. Mutations in HCN4, the gene encoding inward Na+/K+ current (If), have been described as a cause of congenital SSS. The objective of this study is to develop an SSS model in embryonic zebrafish, and use zebrafish as a moderate-throughput assay to functionally characterize HCN4 variants. METHODS: To determine the function of hcn4 in zebrafish, embryos were either bathed in the If -specific blocker (ZD-7288), or endogenous hcn4 expression was knocked down using splice-blocking morpholinos...
August 11, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28782493/big-data-and-genome-editing-technology-a-new-paradigm-of-cardiovascular-genomics
#2
Chayakrit Krittanawong, Tao Sun, Eyal Herzog
Cardiovascular diseases (CVDs) encompasse a range of conditions extending from congenital heart disease to acute coronary syndrome most of which are heterogenous in nature and some of them are multiple genetic loci. However, the pathogenesis of most CVDs remains incompletely understood. The advance in genome-editing technologies, an engineering process of DNA sequences at precise genomic locations, has enabled a new paradigm that human genome can be precisely modified to achieve a therapeutic effect. Genome-editing includes the correction of genetic variants that cause disease, the addition of therapeutic genes to specific sites in the genomic locations, and the removal of deleterious genes or genome sequences...
August 4, 2017: Current Cardiology Reviews
https://www.readbyqxmd.com/read/28753627/nuclear-cytoplasmic-transport-defects-in-bbs6-underlie-congenital-heart-disease-through-perturbation-of-a-chromatin-remodeling-protein
#3
Charles Anthony Scott, Autumn N Marsden, Michael R Rebagliati, Qihong Zhang, Xitiz Chamling, Charles C Searby, Lisa M Baye, Val C Sheffield, Diane C Slusarski
Mutations in BBS6 cause two clinically distinct syndromes, Bardet-Biedl syndrome (BBS), a syndrome caused by defects in cilia transport and function, as well as McKusick-Kaufman syndrome, a genetic disorder characterized by congenital heart defects. Congenital heart defects are rare in BBS, and McKusick-Kaufman syndrome patients do not develop retinitis pigmentosa. Therefore, the McKusick-Kaufman syndrome allele may highlight cellular functions of BBS6 distinct from the presently understood functions in the cilia...
July 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28719389/genetic-contribution-to-neurodevelopmental-outcomes-in-congenital-heart-disease-are-some-patients-predetermined-to-have-developmental-delay
#4
Caitlin K Rollins, Jane W Newburger, Amy E Roberts
PURPOSE OF REVIEW: Neurodevelopmental impairment is common in children with moderate to severe congenital heart disease (CHD). As children live longer and healthier lives, research has focused on identifying causes of neurodevelopmental morbidity that significantly impact long-term quality of life. This review will address the role of genetic factors in predicting neurodevelopmental outcome in CHD. RECENT FINDINGS: A robust literature suggests that among children with various forms of CHD, those with known genetic/extracardiac anomalies are at highest risk of neurodevelopmental impairment...
July 14, 2017: Current Opinion in Pediatrics
https://www.readbyqxmd.com/read/28706735/the-importance-of-copy-number-variation-in-congenital-heart-disease
#5
Gregory Costain, Candice K Silversides, Anne S Bassett
Congenital heart disease (CHD) is the most common class of major malformations in humans. The historical association with large chromosomal abnormalities foreshadowed the role of submicroscopic rare copy number variations (CNVs) as important genetic causes of CHD. Recent studies have provided robust evidence for these structural variants as genome-wide contributors to all forms of CHD, including CHD that appears isolated without extra-cardiac features. Overall, a CNV-related molecular diagnosis can be made in up to one in eight patients with CHD...
September 14, 2016: NPJ Genomic Medicine
https://www.readbyqxmd.com/read/28687876/chromosome-21-encoded-micrornas-mrnas-impact-on-down-s-syndrome-and-trisomy-21-linked-disease
#6
P N Alexandrov, M E Percy, Walter J Lukiw
Down's syndrome (DS; also known as trisomy 21; T21) is caused by a triplication of all or part of human chromosome 21 (chr21). DS is the most common genetic cause of intellectual disability attributable to a naturally-occurring imbalance in gene dosage. DS incurs huge medical, healthcare, and socioeconomic costs, and there are as yet no effective treatments for this incapacitating human neurogenetic disorder. There is a remarkably wide variability in the 'phenotypic spectrum' associated with DS; the progression of symptoms and the age of DS onset fluctuate, and there is further variability in the biophysical nature of the chr21 duplication...
July 7, 2017: Cellular and Molecular Neurobiology
https://www.readbyqxmd.com/read/28677747/mesp1-loss%C3%A2-of%C3%A2-function-mutation-contributes-to-double-outlet-right-ventricle
#7
Min Zhang, Fu-Xing Li, Xing-Yuan Liu, Ri-Tai Huang, Song Xue, Xiao-Xiao Yang, Yan-Jie Li, Hua Liu, Hong-Yu Shi, Xin Pan, Xing-Biao Qiu, Yi-Qing Yang
Congenital heart disease (CHD) is the most common form of birth defect in humans, and remains a leading non‑infectious cause of infant mortality worldwide. An increasing number of studies have demonstrated that genetic defects serve a pivotal role in the pathogenesis of CHD, and mutations in >60 genes have been causally associated with CHD. CHD is a heterogeneous disease and the genetic basis of CHD in the majority of patients remains poorly understood. In the present study, the coding exons and flanking introns of the mesoderm posterior 1 (MESP1) gene, which encodes a basic helix‑loop‑helix transcription factor required for normal cardiovascular development, were sequenced in 178 unrelated patients with CHD...
September 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28592524/loss-of-function-in-robo1-is-associated-with-tetralogy-of-fallot-and-septal-defects
#8
Paul Kruszka, Pranoot Tanpaiboon, Katherine Neas, Kathleen Crosby, Seth I Berger, Ariel F Martinez, Yonit A Addissie, Yupada Pongprot, Rekwan Sittiwangkul, Suchaya Silvilairat, Krit Makonkawkeyoon, Lan Yu, Julia Wynn, James T Bennett, Heather C Mefford, William T Reynolds, Xiaoqin Liu, Mathilda T M Mommersteeg, Wendy K Chung, Cecilia W Lo, Maximilian Muenke
BACKGROUND: Congenital heart disease (CHD) is a common birth defect affecting approximately 1% of newborns. Great progress has been made in elucidating the genetic aetiology of CHD with advances in genomic technology, which we leveraged in recovering a new pathway affecting heart development in humans previously known to affect heart development in an animal model. METHODS: Four hundred and sixteen individuals from Thailand and the USA diagnosed with CHD and/or congenital diaphragmatic hernia were evaluated with chromosomal microarray and whole exome sequencing...
June 7, 2017: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28556366/a-role-for-primary-cilia-in-aortic-valve-development-and-disease
#9
Katelynn A Toomer, Diana Fulmer, Lilong Guo, Alex Drohan, Neal Peterson, Paige Swanson, Brittany Brooks, Rupak Mukherjee, Simon Body, Joshua H Lipschutz, Andy Wessels, Russell A Norris
BACKGROUND: Bicuspid aortic valve (BAV) disease is the most common congenital heart defect, affecting 0.5-1.2% of the population and causing significant morbidity and mortality. Only a few genes have been identified in pedigrees, and no single gene model explains BAV inheritance, thus supporting a complex genetic network of interacting genes. However, patients with rare syndromic diseases that stem from alterations in the structure and function of primary cilia ("ciliopathies") exhibit BAV as a frequent cardiovascular finding, suggesting primary cilia may factor broadly in disease etiology...
August 2017: Developmental Dynamics: An Official Publication of the American Association of Anatomists
https://www.readbyqxmd.com/read/28553164/tbx20-loss-of-function-mutation-responsible-for-familial-tetralogy-of-fallot-or-sporadic-persistent-truncus-arteriosus
#10
Ri-Tai Huang, Juan Wang, Song Xue, Xing-Biao Qiu, Hong-Yu Shi, Ruo-Gu Li, Xin-Kai Qu, Xiao-Xiao Yang, Hua Liu, Ning Li, Yan-Jie Li, Ying-Jia Xu, Yi-Qing Yang
Congenital heart disease (CHD), the most common form of developmental abnormality in humans, remains a leading cause of morbidity and mortality in neonates. Genetic defects have been recognized as the predominant causes of CHD. Nevertheless, CHD is of substantial genetic heterogeneity and the genetic defects underlying CHD in most cases remain unclear. In the current study, the coding regions and splicing junction sites of the TBX20 gene, which encodes a T-box transcription factor key to cardiovascular morphogenesis, were sequenced in 175 unrelated patients with CHD, and a novel heterozygous TBX20 mutation, p...
2017: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/28530678/the-complex-genetics-of-hypoplastic-left-heart-syndrome
#11
Xiaoqin Liu, Hisato Yagi, Shazina Saeed, Abha S Bais, George C Gabriel, Zhaohan Chen, Kevin A Peterson, You Li, Molly C Schwartz, William T Reynolds, Manush Saydmohammed, Brian Gibbs, Yijen Wu, William Devine, Bishwanath Chatterjee, Nikolai T Klena, Dennis Kostka, Karen L de Mesy Bentley, Madhavi K Ganapathiraju, Phillip Dexheimer, Linda Leatherbury, Omar Khalifa, Anchit Bhagat, Maliha Zahid, William Pu, Simon Watkins, Paul Grossfeld, Stephen A Murray, George A Porter, Michael Tsang, Lisa J Martin, D Woodrow Benson, Bruce J Aronow, Cecilia W Lo
Congenital heart disease (CHD) affects up to 1% of live births. Although a genetic etiology is indicated by an increased recurrence risk, sporadic occurrence suggests that CHD genetics is complex. Here, we show that hypoplastic left heart syndrome (HLHS), a severe CHD, is multigenic and genetically heterogeneous. Using mouse forward genetics, we report what is, to our knowledge, the first isolation of HLHS mutant mice and identification of genes causing HLHS. Mutations from seven HLHS mouse lines showed multigenic enrichment in ten human chromosome regions linked to HLHS...
July 2017: Nature Genetics
https://www.readbyqxmd.com/read/28525297/association-analysis-of-nonsyndromic-congenital-heart-disease-and-tag-single-nucleotide-polymorphisms-of-tbx20-and-genes-in-the-ras-mapk-pathway
#12
Zhiling Luo, Yan Shen, Wei Chen, Xuejuan Ma, Liping Liu, Xiaoqin Huang, Zhaoqing Yang, Hao Sun
AIMS: The present study was performed to determine whether there are variants in TBX20 and genes of the Ras-MAPK pathway associated with nonsyndromic congenital heart disease (ns-CHD). MATERIALS AND METHODS: A total of 223 ns-CHD patients and 273 healthy controls from China were selected as study subjects to perform an association analysis using 22 tag single-nucleotide polymorphisms (tag SNPs) located either in one of three genes in the Ras-MAPK pathway (MAP2K2, BRAF, and RAF1) or the TBX20 gene that have previously been associated with syndromic congenital heart disease...
July 2017: Genetic Testing and Molecular Biomarkers
https://www.readbyqxmd.com/read/28515796/genetic-heterogeneity-of-patients-with-suspected-silver-russell-syndrome-genome-wide-copy-number-analysis-in-82-patients-without-imprinting-defects
#13
Takanobu Inoue, Akie Nakamura, Tomoko Fuke, Kazuki Yamazawa, Shinichiro Sano, Keiko Matsubara, Seiji Mizuno, Yoshika Matsukura, Chie Harashima, Tatsuji Hasegawa, Hisakazu Nakajima, Kumi Tsumura, Zenro Kizaki, Akira Oka, Tsutomu Ogata, Maki Fukami, Masayo Kagami
BACKGROUND: Silver-Russell syndrome (SRS) is a rare congenital disorder characterized by pre- and postnatal growth failure and dysmorphic features. Recently, pathogenic copy number variations (PCNVs) and imprinting defects other than hypomethylation of the H19-differentially methylated region (DMR) and maternal uniparental disomy chromosome 7 have been reported in patients with the SRS phenotype. This study aimed to clarify the frequency and clinical features of patients with SRS phenotype caused by PCNVs...
2017: Clinical Epigenetics
https://www.readbyqxmd.com/read/28511407/gerbode-ventricular-septal-defect-a-rare-cardiac-anomaly-associated-with-genetic-variants-in-indian-population-a-case-series
#14
Yashvanthi Borkar, Krishnananda Nayak, Ranjan K Shetty, Gopalakrishna Bhat, Rajasekhar Moka
Gerbode defects are rare Ventricular Septal Defects (VSD) constituting approximately one percent cases of congenital heart diseases. The genetic predispositions towards the Gerbode Defect (GD) have remained an unexplored area of study till date. We investigated the genotype-phenotype correlation in patients with Gerbode VSD. Molecular genetic study on Sanger sequencing and subsequent data analysis showed that the contributing sequence variations in the NKX2-5, GATA4 and TBX5 gene lies in one of the highly conserved regions and this region is responsible for encoding a functional protein...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28469493/beyond-the-electrocardiogram-mutations-in-cardiac-ion-channel-genes-underlie-nonarrhythmic-phenotypes
#15
REVIEW
Thomas M Roston, Taylor Cunningham, Anna Lehman, Zachary W Laksman, Andrew D Krahn, Shubhayan Sanatani
Cardiac ion channelopathies are an important cause of sudden death in the young and include long QT syndrome, Brugada syndrome, catecholaminergic polymorphic ventricular tachycardia, idiopathic ventricular fibrillation, and short QT syndrome. Genes that encode ion channels have been implicated in all of these conditions, leading to the widespread implementation of genetic testing for suspected channelopathies. Over the past half-century, researchers have also identified systemic pathologies that extend beyond the arrhythmic phenotype in patients with ion channel gene mutations, including deafness, epilepsy, cardiomyopathy, periodic paralysis, and congenital heart disease...
2017: Clinical Medicine Insights. Cardiology
https://www.readbyqxmd.com/read/28436940/disruption-of-spatiotemporal-hypoxic-signaling-causes-congenital-heart-disease-in-mice
#16
Xuejun Yuan, Hui Qi, Xiang Li, Fan Wu, Jian Fang, Eva Bober, Gergana Dobreva, Yonggang Zhou, Thomas Braun
Congenital heart disease (CHD) represents the most prevalent inborn anomaly. Only a minority of CHD cases are attributed to genetic causes, suggesting a major role of environmental factors. Nonphysiological hypoxia during early pregnancy induces CHD, but the underlying reasons are unknown. Here, we have demonstrated that cells in the mouse heart tube are hypoxic, while cardiac progenitor cells (CPCs) expressing islet 1 (ISL1) in the secondary heart field (SHF) are normoxic. In ISL1+ CPCs, induction of hypoxic responses caused CHD by repressing Isl1 and activating NK2 homeobox 5 (Nkx2...
June 1, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28434921/identification-of-a-novel-and-functional-mutation-in-the-tbx5-gene-in-a-patient-by-screening-from-354-patients-with-isolated-ventricular-septal-defect
#17
Huan-Xin Chen, Xi Zhang, Hai-Tao Hou, Jun Wang, Qin Yang, Xiu-Li Wang, Guo-Wei He
Ventricular septal defect (VSD) is the most frequently occurring congenital heart disease in newborns. A number of genetic studies have linked TBX5 mutations to cardiac abnormalities. We aimed to identify potential pathogenic mutations in TBX5 and to provide insights into the etiology of sporadic and isolated VSD. Case-control mutational and functional analyses were performed in 354 sporadic patients with isolated VSD and 341 controls. All the coding exons and intron-exon boundaries of TBX5 were first sequenced in a group of VSD patients and controls...
April 18, 2017: European Journal of Medical Genetics
https://www.readbyqxmd.com/read/28395882/should-studies-on-glanzmann-thrombasthenia-not-be-telling-us-more-about-cardiovascular-disease-and-other-major-illnesses
#18
REVIEW
Alan T Nurden
Glanzmann thrombasthenia (GT) is a rare inherited bleeding disorder caused by loss of αIIbβ3 integrin function in platelets. Most genetic variants of β3 also affect the widely expressed αvβ3 integrin. With brief mention of mouse models, I now look at the consequences of disease-causing ITGA2B and ITGB3 mutations on the non-hemostatic functions of platelets and other cells. Reports of arterial thrombosis in GT patients are rare, but other aspects of cardiovascular disease do occur including deep vein thrombosis and congenital heart defects...
April 4, 2017: Blood Reviews
https://www.readbyqxmd.com/read/28390064/pgap3-related-hyperphosphatasia-with-mental-retardation-syndrome-report-of-10-new-patients-and-a-homozygous-founder-mutation
#19
M S Abdel-Hamid, M Y Issa, G A Otaify, S F Abdel-Ghafar, H M Elbendary, M S Zaki
Hyperphosphatasia with mental retardation syndrome (HPMRS) is caused by recessive mutations in genes involved in the glycosylphosphatidylinsitol pathway, including PGAP3. Herein, we describe 10 patients from 8 Egyptian families presenting with developmental delay, severe intellectual disability, distinct facial dysmorphism and increased alkaline phosphatase. Eight patients had cleft palate, four had postnatal microcephaly and five had seizures. Neuroimaging findings showed thin corpus callosum in 9 patients, mild ventriculomegaly in 3 patients and variable degrees of cerebellar vermis hypoplasia in 4 patients, a finding not previously reported in patients with HPMRS...
April 8, 2017: Clinical Genetics
https://www.readbyqxmd.com/read/28377914/a-case-of-22q11-deletion-syndrome-22q11ds-with-a-panayiotopoulos-epileptic-pattern-are-additional-copy-number-variations-a-possible-second-hit-in-modulating-the-22q11ds-phenotype
#20
Veronica Bertini, Angelo Valetto, Alessia Azzarà, Annalisa Legitimo, Giuseppe Saggese, Rita Consolini, Alessandro Orsini, Alice Bonuccelli
"22q11 deletion syndrome" (22q11DS) is a rare genetic syndrome, in which most patients share the same deletion, but their clinical features may vary a great deal. The genetic mechanisms underlying the variable expressivity and reduced penetrance of 22q11DS still have to be fully elucidated. Epilepsy has been reported in about 15.2% of the patients; however, few studies have focused on this topic, and in most cases, a detailed epileptic profile is missing. Since only a minority of patients experience epileptic seizures, 22q11deletion can be considered a predisposing factor, which is not sufficient "per se" to cause epilepsy; to date, no candidate gene for epilepsy has been identified in the deleted region...
2017: Frontiers in Pediatrics
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