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Emery-Dreifuss Muscular Dystrophy: the Most Recognizable Laminopathy
Review paper Emery-Dreifuss muscular dystrophy: the most recognizable laminopathy Agnieszka Madej-Pilarczyk, Andrzej Kochański Neuromuscular Unit, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland The authors dedicate this review to Prof. Irena Hausmanowa-Petrusewicz. Folia Neuropathol 2016; 54 (1): 1-8 DOI: 10.5114/fn.2016.58910 Abstract Emery-Dreifuss muscular dystrophy (EDMD), a rare inherited disease, is characterized clinically by humero-peroneal muscle atrophy and weakness, multijoint contractures, spine rigidity and cardiac insufficiency with conduction defects. There are at least six types of EDMD known so far, of which five have been associated with mutations in genes encoding nuclear proteins. The majority of the EDMD cases described so far are of the emerinopathy (EDMD1) kind, with a recessive X-linked mode of inheritance, or else laminopathy (EDMD2), with an autosomal dominant mode of inheritance. In the work described here, the authors have sought to describe the history by which EDMD came to be distinguished as a separate entity, as well as the clinical and genetic characteristics of the disease, the pathophysiolo- gy of lamin-related muscular diseases and, finally, therapeutic issues, prevention and ethical aspects. Key words: Emery-Dreifuss muscular dystrophy, emerin, lamin A/C, laminopathy, LMNA gene. embryo nic development [14,35]. Lamin A/C plays the Introduction role of a structural integrator in a cell nucleus, ensur- Laminopathies fall within a group of rare diseas- ing the maintenance of the latter’s shape, as well as es connected with structural/functional defects of its mechanical endurance (mechanotransduction). the proteins making up the nuclear envelope (which It takes part in regulation of the cell-division cycle, is composed of inner and outer nuclear membranes). -
Three New Cases of Dilated Cardiomyopathy Caused by Mutations in LMNA Gene
Acta Myologica • 2017; XXXVI: p. 207-212 Three new cases of dilated cardiomyopathy caused by mutations in LMNA gene Larysa N. Sivitskaya1, Nina G. Danilenko1, Tatiyana G. Vaikhanskaya2, Tatsiyana V. Kurushka2 and Oleg G. Davydenko1 1 Institute of Genetics and Cytology, National Academy of Sciences of Belarus, Minsk, Belarus; 2 Republican Scientific and Practical Center of Cardiology, Minsk, Belarus Three cases of delated cardiomyopathy (DCM) with conduc- Mutations in LMNA affect lamins’ dimerization and as- tion defects (OMIM 115200), limb girdle muscular dystrophy sembly (1, 2). It apparently leads to nuclear stability loss 1B (OMIM 159001) and autosomal dominant Emery-Dreifuss and inability to perform functions in its entirety. The muscular dystrophy 2 (OMIM 181350), all associated with dif- ferent LMNA mutations are presented. Three heterozygous mutations in LMNA lead to at least 10 clinically distinct missense mutations were identified in unrelated patients – p. phenotypes, termed laminopathies, affecting different W520R (c.1558T > C), p.T528R (с.1583С > G) and p.R190P tissues including cardiac and skeletal muscle, cutane- (c.569G > C). We consider these variants as pathogenic, lead- ous, nervous and adipose tissue. There is no explicit ing to isolated DCM with conduction defects or syndromic relation between syndrome development and mutation DCM forms with limb-girdle muscular dystrophy and Emery- domain localization. A number of hot spots were de- Dreifuss muscular dystrophy. The mutations were not detected in the ethnically matched control group and publicly available scribed in LMNA, but the mutations common for lami- population databases. Their de novo occurrence led to the de- nopathies were not found. -
Genetic Mutations and Mechanisms in Dilated Cardiomyopathy
Genetic mutations and mechanisms in dilated cardiomyopathy Elizabeth M. McNally, … , Jessica R. Golbus, Megan J. Puckelwartz J Clin Invest. 2013;123(1):19-26. https://doi.org/10.1172/JCI62862. Review Series Genetic mutations account for a significant percentage of cardiomyopathies, which are a leading cause of congestive heart failure. In hypertrophic cardiomyopathy (HCM), cardiac output is limited by the thickened myocardium through impaired filling and outflow. Mutations in the genes encoding the thick filament components myosin heavy chain and myosin binding protein C (MYH7 and MYBPC3) together explain 75% of inherited HCMs, leading to the observation that HCM is a disease of the sarcomere. Many mutations are “private” or rare variants, often unique to families. In contrast, dilated cardiomyopathy (DCM) is far more genetically heterogeneous, with mutations in genes encoding cytoskeletal, nucleoskeletal, mitochondrial, and calcium-handling proteins. DCM is characterized by enlarged ventricular dimensions and impaired systolic and diastolic function. Private mutations account for most DCMs, with few hotspots or recurring mutations. More than 50 single genes are linked to inherited DCM, including many genes that also link to HCM. Relatively few clinical clues guide the diagnosis of inherited DCM, but emerging evidence supports the use of genetic testing to identify those patients at risk for faster disease progression, congestive heart failure, and arrhythmia. Find the latest version: https://jci.me/62862/pdf Review series Genetic mutations and mechanisms in dilated cardiomyopathy Elizabeth M. McNally, Jessica R. Golbus, and Megan J. Puckelwartz Department of Human Genetics, University of Chicago, Chicago, Illinois, USA. Genetic mutations account for a significant percentage of cardiomyopathies, which are a leading cause of conges- tive heart failure. -
Deciphering Nuclear Mechanobiology in Laminopathy
cells Review Deciphering Nuclear Mechanobiology in Laminopathy Jungwon Hah and Dong-Hwee Kim * KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Korea; [email protected] * Correspondence: [email protected]; Tel.: +82-2-3290-4615 Received: 29 January 2019; Accepted: 5 March 2019; Published: 11 March 2019 Abstract: Extracellular mechanical stimuli are translated into biochemical signals inside the cell via mechanotransduction. The nucleus plays a critical role in mechanoregulation, which encompasses mechanosensing and mechanotransduction. The nuclear lamina underlying the inner nuclear membrane not only maintains the structural integrity, but also connects the cytoskeleton to the nuclear envelope. Lamin mutations, therefore, dysregulate the nuclear response, resulting in abnormal mechanoregulations, and ultimately, disease progression. Impaired mechanoregulations even induce malfunction in nuclear positioning, cell migration, mechanosensation, as well as differentiation. To know how to overcome laminopathies, we need to understand the mechanisms of laminopathies in a mechanobiological way. Recently, emerging studies have demonstrated the varying defects from lamin mutation in cellular homeostasis within mechanical surroundings. Therefore, this review summarizes recent findings highlighting the role of lamins, the architecture of nuclear lamina, and their disease relevance in the context of nuclear mechanobiology. We will also provide an overview of the differentiation of cellular mechanics in laminopathy. Keywords: lamin; laminopathy; cytoskeleton; nucleus 1. Introduction Mechanical stimuli are the key to controlling numerous biological processes, including proliferation, differentiation, and migration [1–3]. Integrin mediates the transduction of forces from the external microenvironment to the intracellular cytoskeleton, and the nucleo-cytoskeletal molecular connections transmit the forces to the intranuclear chromosomal organizations [4,5]. -
Childhood Epilepsy: an Update on Diagnosis and Management
American Journal of Neuroscience Review Childhood Epilepsy: An Update on Diagnosis and Management Khaled Saad Department of Pediatrics, Faculty of Medicine, University of Assiut, Assiut 71516, Egypt Article history Abstract: Within the past few years there is a rapid expansion in our Received: 23-10-2014 understanding of epilepsy. The development of new anti-epileptic drugs and Revised: 25-11-2014 refinements to epilepsy surgery are widening the therapeutic options for Accepted: 12-01-2015 epilepsy. In addition, the classification of the epilepsies continues to evolve based on an increased understanding of the molecular genetics of the condition and this includes the recognition of possible novel epilepsy syndromes. This review considers some of these exciting developments, as well as addressing the essential features of the diagnosis, investigations, management and impact of epilepsy in childhood. Keywords: Children, Epilepsy, Seizure, Anti-Epileptic Drugs Introduction guidelines for optimal practices, rational therapy and counseling (Aylwad, 2008; Tamber and Mountz, 2012; Epilepsy is a common heterogeneous neurological Sharma, 2013). problem in children. It exerts a significant physical, psychological, economic and social toll on children and Definitions their caregivers. Fifty million people have epilepsies A seizure is defined as an excessive burst of abnormal globally; more than half of them are children. In the synchronized neuronal activity affecting small or large USA; between 25,000 and 40,000 children will have a neuronal networks that results in clinical manifestations first non-febrile seizure each year. The problem is that are sudden, transient and usually brief. Epilepsy is further compounded in developing countries as they add defined as a disorder of the brain characterized by any of about 75-80% of new cases of epilepsy (Guerrini, 2006; the following conditions: (1) At least two unprovoked (or Tamber and Mountz, 2012; Sharma, 2013). -
Genetic Determinants Underlying Rare Diseases Identified Using Next-Generation Sequencing Technologies
Western University Scholarship@Western Electronic Thesis and Dissertation Repository 8-2-2018 1:30 PM Genetic determinants underlying rare diseases identified using next-generation sequencing technologies Rosettia Ho The University of Western Ontario Supervisor Hegele, Robert A. The University of Western Ontario Graduate Program in Biochemistry A thesis submitted in partial fulfillment of the equirr ements for the degree in Master of Science © Rosettia Ho 2018 Follow this and additional works at: https://ir.lib.uwo.ca/etd Part of the Medical Genetics Commons Recommended Citation Ho, Rosettia, "Genetic determinants underlying rare diseases identified using next-generation sequencing technologies" (2018). Electronic Thesis and Dissertation Repository. 5497. https://ir.lib.uwo.ca/etd/5497 This Dissertation/Thesis is brought to you for free and open access by Scholarship@Western. It has been accepted for inclusion in Electronic Thesis and Dissertation Repository by an authorized administrator of Scholarship@Western. For more information, please contact [email protected]. Abstract Rare disorders affect less than one in 2000 individuals, placing a huge burden on individuals, families and the health care system. Gene discovery is the starting point in understanding the molecular mechanisms underlying these diseases. The advent of next- generation sequencing has accelerated discovery of disease-causing genetic variants and is showing numerous benefits for research and medicine. I describe the application of next-generation sequencing, namely LipidSeq™ ‒ a targeted resequencing panel for the identification of dyslipidemia-associated variants ‒ and whole-exome sequencing, to identify genetic determinants of several rare diseases. Utilization of next-generation sequencing plus associated bioinformatics led to the discovery of disease-associated variants for 71 patients with lipodystrophy, two with early-onset obesity, and families with brachydactyly, cerebral atrophy, microcephaly-ichthyosis, and widow’s peak syndrome. -
Causes of Mortality in Early Infantile Epileptic Encephalopathy: a Systematic Review
Epilepsy & Behavior 85 (2018) 32–36 Contents lists available at ScienceDirect Epilepsy & Behavior journal homepage: www.elsevier.com/locate/yebeh Review Causes of mortality in early infantile epileptic encephalopathy: A systematic review Graciane Radaelli a,b, Francisco de Souza Santos b, Wyllians Vendramini Borelli b,LeonardoPisanib, Magda Lahorgue Nunes b,d, Fulvio Alexandre Scorza c,d, Jaderson Costa da Costa b,d,⁎ a Federal University of São Paulo (UNIFESP)/Paulista School of Medicine, São Paulo, Brazil b Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil c Laboratory of Neuroscience, Department of Neurology and Neurosurgery, Federal University of São Paulo, São Paulo, SP, Brazil d CNPq, Brazil article info abstract Article history: Introduction: Early infantile epileptic encephalopathy syndrome (EIEE), also known as Ohtahara syndrome, is an Received 6 March 2018 age-dependent epileptic encephalopathy syndrome defined by clinical features and electroencephalographic Revised 25 April 2018 findings. Epileptic disorders with refractory seizures beginning in the neonatal period and/or early infancy Accepted 5 May 2018 have a potential risk of premature mortality, including sudden death. We aimed to identify the causes of death Available online xxxx in EIEE and conducted a literature survey of fatal outcomes. Methods: We performed a literature search in MEDLINE, EMBASE, and Web of Science for data from inception Keywords: “ ”“ ”“ ”“ ” “ ” Ohtahara syndrome until September 2017. The terms death sudden, unexplained death, SUDEP, lethal, and fatal and the “ ”“ ”“ ”“ Early infantile epileptic syndrome medical subject heading terms epileptic encephalopathy, mortality, death, sudden infant death syn- Suppression burst drome,” and “human” were used in the search strategy. -
Global Journal of Medical Research: F Diseases Cancer, Ophthalmology & Pediatric
OnlineISSN:2249-4618 PrintISSN:0975-5888 DOI:10.17406/GJMRA CoronaryArteryBypassGrafting RelationshipofClinicalManifestations SynapticPruninginAlzheimerʼsDisease TreatmentofUpperandLowerRespiratory VOLUME20ISSUE6VERSION1.0 Global Journal of Medical Research: F Diseases Cancer, Ophthalmology & Pediatric Global Journal of Medical Research: F Diseases Cancer, Ophthalmology & Pediatric Volume 2 0 Issue 6 (Ver. 1.0) Open Association of Research Society Global Journals Inc. © Global Journal of Medical (A Delaware USA Incorporation with “Good Standing”; Reg. Number: 0423089) Sponsors:Open Association of Research Society Research. 2020. Open Scientific Standards All rights reserved. Publisher’s Headquarters office This is a special issue published in version 1.0 of “Global Journal of Medical Research.” By ® Global Journals Inc. Global Journals Headquarters 945th Concord Streets, All articles are open access articles distributed under “Global Journal of Medical Research” Framingham Massachusetts Pin: 01701, United States of America Reading License, which permits restricted use. Entire contents are copyright by of “Global USA Toll Free: +001-888-839-7392 Journal of Medical Research” unless USA Toll Free Fax: +001-888-839-7392 otherwise noted on specific articles. Offset Typesetting No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including Global Journals Incorporated photocopy, recording, or any information 2nd, Lansdowne, Lansdowne Rd., Croydon-Surrey, storage and retrieval system, without written permission. Pin: CR9 2ER, United Kingdom The opinions and statements made in this Packaging & Continental Dispatching book are those of the authors concerned. Ultraculture has not verified and neither confirms nor denies any of the foregoing and Global Journals Pvt Ltd no warranty or fitness is implied. E-3130 Sudama Nagar, Near Gopur Square, Engage with the contents herein at your own Indore, M.P., Pin:452009, India risk. -
Neonatal Seizures Revisited
children Review Neonatal Seizures Revisited Konrad Kaminiów 1 , Sylwia Kozak 1 and Justyna Paprocka 2,* 1 Students’ Scientific Society, Department of Pediatric Neurology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, 40-752 Katowice, Poland; [email protected] (K.K.); [email protected] (S.K.) 2 Department of Pediatric Neurology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, 40-752 Katowice, Poland * Correspondence: [email protected] Abstract: Seizures are the most common neurological disorder in newborns and are most prevalent in the neonatal period. They are mostly caused by severe disorders of the central nervous system (CNS). However, they can also be a sign of the immaturity of the infant’s brain, which is characterized by the presence of specific factors that increase excitation and reduce inhibition. The most common disorders which result in acute brain damage and can manifest as seizures in neonates include hypoxic-ischemic encephalopathy (HIE), ischemic stroke, intracranial hemorrhage, infections of the CNS as well as electrolyte and biochemical disturbances. The therapeutic management of neonates and the prognosis are different depending on the etiology of the disorders that cause seizures which can lead to death or disability. Therefore, establishing a prompt diagnosis and implementing appropriate treatment are significant, as they can limit adverse long-term effects and improve outcomes. In this review paper, we present the latest reports on the etiology, pathomechanism, clinical symptoms and guidelines for the management of neonates with acute symptomatic seizures. Keywords: neonatal seizures; pathophysiology; genetics; inborn errors of metabolism Citation: Kaminiów, K.; Kozak, S.; Paprocka, J. -
Two Novel Pathogenic FBN1 Variations and Their Phenotypic Relationship of Marfan Syndrome
Published online: 2020-08-20 THIEME 68 Case Report Two Novel Pathogenic FBN1 Variations and Their Phenotypic Relationship of Marfan Syndrome Sinem Yalcintepe1 Selma Demir1 Emine Ikbal Atli1 Murat Deveci2 Engin Atli1 Hakan Gurkan1 1 Department of Medical Genetics, Faculty of Medicine, Trakya Address for correspondence Sinem Yalcıntepe, MD, Department of University, Edirne, Turkey Medical Genetics, Trakya University, Faculty of Medicine, Edirne 2 Department of Pediatric Cardiology, Faculty of Medicine, Trakya 22030, Turkey (e-mail: [email protected]). University, Edirne, Turkey Global Med Genet 2020;7:68–71. Abstract Marfan syndrome is an autosomal dominant disease affecting connective tissue involving the ocular, skeletal systems with a prevalence of 1/5,000 to 1/10,000 cases. Especially cardiovascular system disorders (aortic root dilatation and enlargement of the pulmonary artery) may be life-threatening. We report here the genetic analysis results of three unrelated cases clinically diagnosed as Marfan syndrome. Deoxyribonucleic acid (DNA) was isolated from EDTA (ethylenediaminetetraacetic acid)-blood samples of the patients. A next-generation sequencing panel containing 15 genes including FBN1 was used to determine the underlying pathogenic variants of Marfan syndrome. Three different variations, NM_000138.4(FBN1):c.229G > A(p.Gly77Arg), NM_000138.4(FBN1):c.165– Keywords 2A > G (novel), NM_000138.4(FBN1):c.399delC (p.Cys134ValfsTer8) (novel) were deter- ► Marfan syndrome mined in our three cases referred with a prediagnosis of Marfan syndrome. Our study has ► novel variation confirmed the utility of molecular testing in Marfan syndrome to support clinical diagnosis. ► next-generation With an accurate diagnosis and genetic counseling for prognosis of patients and family sequencing testing, the prenatal diagnosis will be possible. -
Abstracts from the 51St European Society of Human Genetics Conference: Electronic Posters
European Journal of Human Genetics (2019) 27:870–1041 https://doi.org/10.1038/s41431-019-0408-3 MEETING ABSTRACTS Abstracts from the 51st European Society of Human Genetics Conference: Electronic Posters © European Society of Human Genetics 2019 June 16–19, 2018, Fiera Milano Congressi, Milan Italy Sponsorship: Publication of this supplement was sponsored by the European Society of Human Genetics. All content was reviewed and approved by the ESHG Scientific Programme Committee, which held full responsibility for the abstract selections. Disclosure Information: In order to help readers form their own judgments of potential bias in published abstracts, authors are asked to declare any competing financial interests. Contributions of up to EUR 10 000.- (Ten thousand Euros, or equivalent value in kind) per year per company are considered "Modest". Contributions above EUR 10 000.- per year are considered "Significant". 1234567890();,: 1234567890();,: E-P01 Reproductive Genetics/Prenatal Genetics then compared this data to de novo cases where research based PO studies were completed (N=57) in NY. E-P01.01 Results: MFSIQ (66.4) for familial deletions was Parent of origin in familial 22q11.2 deletions impacts full statistically lower (p = .01) than for de novo deletions scale intelligence quotient scores (N=399, MFSIQ=76.2). MFSIQ for children with mater- nally inherited deletions (63.7) was statistically lower D. E. McGinn1,2, M. Unolt3,4, T. B. Crowley1, B. S. Emanuel1,5, (p = .03) than for paternally inherited deletions (72.0). As E. H. Zackai1,5, E. Moss1, B. Morrow6, B. Nowakowska7,J. compared with the NY cohort where the MFSIQ for Vermeesch8, A. -
A Mutation in FBN1 Disrupts Profibrillin Processing and Results in Isolated Skeletal Features of the Marfan Syndrome Dianna M
Rapid Publication A Mutation in FBN1 Disrupts Profibrillin Processing and Results in Isolated Skeletal Features of the Marfan Syndrome Dianna M. Milewicz,* Jami Grossfield,* Shi-Nian Cao,* Cay Kielty,* Wesley Covitz, and Tamison Jewett* *Department of Internal Medicine, University of Texas-Houston Medical School, Houston, Texas 77030; tSchool of Biological Sciences, University of Manchester, UK, M 13 9PT; and §Department of Pediatrics, Bowman-Gray School of Medicine, Winston-Salem, North Carolina, 27157 Abstract if left untreated (3). The major ocular manifestations are ectopia lentis and myopia. The skeletal features are readily apparent Dermal fibroblasts from a 13-yr-old boy with isolated skele- when examining affected individuals and include tall stature tal features of the Marfan syndrome were used to study secondary to dolichostenomelia, arachnodactyly, scoliosis, and fibrillin synthesis and processing. Only one half of the se- pectus deformities. Although any of the manifestations of the creted profibrillin was proteolytically processed to fibrillin Marfan syndrome can occur as an isolated finding in an individ- outside the cell and deposited into the extracellular matrix. ual, it is the constellation of findings involving these systems Electron microscopic examination of rotary shadowed mi- and the autosomal dominant inheritance of these findings that crofibrils made by the proband's fibroblasts were indistin- characterize the Marfan syndrome (4). guishable from control cells. Sequencing of the FBN1 gene Extensive research has established that mutations in the revealed a heterozygous C to T transition at nucleotide 8176 FBNJ gene result in the Marfan syndrome (5-8). FBNI en- resulting in the substitution of a tryptophan for an arginine codes a large glycoprotein, fibrillin, that is a component of (R2726W), at a site immediately adjacent to a consensus microfibrils found in the extracellular matrix (9).