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Epilepsy genetics

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https://www.readbyqxmd.com/read/28212375/epilepsy-associated-gene-nedd4-2-mediates-neuronal-activity-and-seizure-susceptibility-through-ampa-receptors
#1
Jiuhe Zhu, Kwan Young Lee, Kathryn A Jewett, Heng-Ye Man, Hee Jung Chung, Nien-Pei Tsai
The neural precursor cell expressed developmentally down-regulated gene 4-2, Nedd4-2, is an epilepsy-associated gene with at least three missense mutations identified in epileptic patients. Nedd4-2 encodes a ubiquitin E3 ligase that has high affinity toward binding and ubiquitinating membrane proteins. It is currently unknown how Nedd4-2 mediates neuronal circuit activity and how its dysfunction leads to seizures or epilepsies. In this study, we provide evidence to show that Nedd4-2 mediates neuronal activity and seizure susceptibility through ubiquitination of GluA1 subunit of the α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor, (AMPAR)...
February 17, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28212175/advances-in-epilepsy-gene-discovery-and-implications-for-epilepsy-diagnosis-and-treatment
#2
Joseph D Symonds, Sameer M Zuberi, Michael R Johnson
PURPOSE OF REVIEW: Epilepsy genetics is shifting from the academic pursuit of gene discovery to a clinical discipline based on molecular diagnosis and stratified medicine. We consider the latest developments in epilepsy genetics and review how gene discovery in epilepsy is influencing the clinical classification of epilepsy and informing new therapeutic approaches and drug discovery. RECENT FINDINGS: Recent studies highlighting the importance of mutation in GABA receptors, NMDA receptors, potassium channels, G-protein coupled receptors, mammalian target of rapamycin pathway and chromatin remodeling are discussed...
February 15, 2017: Current Opinion in Neurology
https://www.readbyqxmd.com/read/28210849/developmental-changes-in-notch1-and-nle1-expression-in-a-genetic-model-of-absence-epilepsy
#3
Fariba Karimzadeh, Sayed Mostafa Modarres Mousavi, Fatemeh Alipour, Hassan Hosseini Ravandi, Stjepana Kovac, Ali Gorji
Childhood absence epilepsy (CAE) is an epilepsy syndrome with seizures occurring in the early childhood, highlighting that seizures susceptibility in CAE is dependent on brain development. The Notch 1 signalling pathway is important in brain development, yet the role of the Notch1 signalling pathway in CAE remains elusive. We here explored Notch1 and its modulator notchless homologue 1 (NLE1) expression in WAG/Rij and control rats using immunohistochemistry. Functional Notch 1 effects were assessed in WAG/Rij rats in vivo...
February 16, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28203254/malformations-of-cortical-development-genetic-mechanisms-and-diagnostic-approach
#4
REVIEW
Jeehun Lee
Malformations of cortical development are rare congenital anomalies of the cerebral cortex, wherein patients present with intractable epilepsy and various degrees of developmental delay. Cases show a spectrum of anomalous cortical formations with diverse anatomic and morphological abnormalities, a variety of genetic causes, and different clinical presentations. Brain magnetic resonance imaging has been of great help in determining the exact morphologies of cortical malformations. The hypothetical mechanisms of malformation include interruptions during the formation of cerebral cortex in the form of viral infection, genetic causes, and vascular events...
January 2017: Korean Journal of Pediatrics
https://www.readbyqxmd.com/read/28203156/papular-epidermal-nevus-with-skyline-basal-cell-layer-syndrome-natural-course-case-report-and-literature-review
#5
Carole Anouk Zahn, Peter Itin
Papular epidermal nevus with "skyline" basal cell layer (PENS) is a very rare type of keratinocytic nevus and is associated with extracutaneous findings such as neurological symptoms in about 50% of the cases. Therefore, it is also referred to as PENS syndrome. Clinically visible hyperkeratotic papules and plaques already appear at birth or shortly thereafter, while neurological symptoms such as epilepsy and mental retardation manifest themselves during childhood. Genetics suggests gonadal mosaicism as a possible cause for the disease...
January 2017: Case Reports in Dermatology
https://www.readbyqxmd.com/read/28202706/clinical-and-genetic-factors-predicting-dravet-syndrome-in-infants-with-scn1a-mutations
#6
Valentina Cetica, Sara Chiari, Davide Mei, Elena Parrini, Laura Grisotto, Carla Marini, Daniela Pucatti, Annarita Ferrari, Federico Sicca, Nicola Specchio, Marina Trivisano, Domenica Battaglia, Ilaria Contaldo, Nelia Zamponi, Cristina Petrelli, Tiziana Granata, Francesca Ragona, Giuliano Avanzini, Renzo Guerrini
OBJECTIVE: To explore the prognostic value of initial clinical and mutational findings in infants with SCN1A mutations. METHODS: Combining sex, age/fever at first seizure, family history of epilepsy, EEG, and mutation type, we analyzed the accuracy of significant associations in predicting Dravet syndrome vs milder outcomes in 182 mutation carriers ascertained after seizure onset. To assess the diagnostic accuracy of all parameters, we calculated sensitivity, specificity, receiver operating characteristic (ROC) curves, diagnostic odds ratios, and positive and negative predictive values and the accuracy of combined information...
February 15, 2017: Neurology
https://www.readbyqxmd.com/read/28202424/gnao1-associated-epileptic-encephalopathy-and-movement-disorders-c-607g-a-variant-represents-a-probable-mutation-hotspot-with-a-distinct-phenotype
#7
Ravindra Arya, Christine Spaeth, Donald L Gilbert, James L Leach, Katherine D Holland
We describe a case of GNAO1-associated epilepsy and chorea in a patient with a de novo pathogenic mutation. This patient is unique in being the first reported male with this phenotype, and we propose that this genetic variant may represent a mutation hotspot that characterizes a unique phenotype. This 5.2-years-old boy presented with seizures, chorea, and severe global developmental delay. Brain imaging showed progressive diffuse cerebral atrophy. EEG monitoring revealed multifocal and diffuse discharges, along with generalized-onset seizures...
February 15, 2017: Epileptic Disorders: International Epilepsy Journal with Videotape
https://www.readbyqxmd.com/read/28202406/cannabis-cultivation-methodological-issues-for-obtaining-medical-grade-product
#8
REVIEW
Suman Chandra, Hemant Lata, Mahmoud A ElSohly, Larry A Walker, David Potter
As studies continue to reveal favorable findings for the use of cannabidiol in the management of childhood epilepsy syndromes and other disorders, best practices for the large-scale production of Cannabis are needed for timely product development and research purposes. The processes of two institutions with extensive experience in producing large-scale cannabidiol chemotype Cannabis crops-GW Pharmaceuticals and the University of Mississippi-are described, including breeding, indoor and outdoor growing, harvesting, and extraction methods...
February 12, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28202008/relationship-between-abcb1-3435tt-genotype-and-antiepileptic-drugs-resistance-in-epilepsy-updated-systematic-review-and-meta-analysis
#9
Malek Chouchi, Wajih Kaabachi, Hedia Klaa, Kalthoum Tizaoui, Ilhem Ben-Youssef Turki, Lamia Hila
BACKGROUND: Antiepileptic drugs (AEDs) are effective medications available for epilepsy. However, many patients do not respond to this treatment and become resistant. Genetic polymorphisms may be involved in the variation of AEDs response. Therefore, we conducted an updated systematic review and a meta-analysis to investigate the contribution of the genetic profile on epilepsy drug resistance. METHODS: We proceeded to the selection of eligible studies related to the associations of polymorphisms with resistance to AEDs therapy in epilepsy, published from January 1980 until November 2016, using Pubmed and Cochrane Library databases...
February 15, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28199897/real-world-utility-of-whole-exome-sequencing-with-targeted-gene-analysis-for-focal-epilepsy
#10
Piero Perucca, Ingrid E Scheffer, A Simon Harvey, Paul A James, Sebastian Lunke, Natalie Thorne, Clara Gaff, Brigid M Regan, John A Damiano, Michael S Hildebrand, Samuel F Berkovic, Terence J O'Brien, Patrick Kwan
OBJECTIVE: Driven by advances in genomic technology and reduction in costs, next-generation sequencing (NGS) is venturing into routine clinical care. The 'real-world' clinical utility of NGS remains to be determined in focal epilepsies, which account for 60% of all epilepsies and for which the importance of genetic factors is just beginning to emerge. We investigated the diagnostic yield and management implications of whole exome sequencing (WES)-based screening of selected genes in the routine care of common focal epilepsies suspected to have a genetic basis...
February 7, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28197949/the-impact-of-next-generation-sequencing-on-the-diagnosis-and-treatment-of-epilepsy-in-paediatric-patients
#11
REVIEW
Davide Mei, Elena Parrini, Carla Marini, Renzo Guerrini
Next-generation sequencing (NGS) has contributed to the identification of many monogenic epilepsy syndromes and is favouring earlier and more accurate diagnosis in a subset of paediatric patients with epilepsy. The cumulative information emerging from NGS studies is rapidly changing our comprehension of the relations between early-onset severe epilepsy and the associated neurological impairment, progressively delineating specific entities previously gathered under the umbrella definition of epileptic encephalopathies, thereby influencing treatment choices and limiting the most aggressive drug regimens only to those conditions that are likely to actually benefit from them...
February 14, 2017: Molecular Diagnosis & Therapy
https://www.readbyqxmd.com/read/28197552/altered-channel-conductance-states-and-gating-of-gabaa-receptors-by-a-pore-mutation-linked-to-dravet-syndrome
#12
Ciria C Hernandez, Weijing Kong, Ningning Hu, Yujia Zhang, Wangzhen Shen, Laurel Jackson, Xiaoyan Liu, Yuwu Jiang, Robert L Macdonald
We identified a de novo missense mutation, P302L, in the γ-aminobutyric acid type A (GABAA) receptor γ2 subunit gene GABRG2 in a patient with Dravet syndrome using targeted next-generation sequencing. The mutation was in the cytoplasmic portion of the transmembrane segment M2 of the γ2 subunit that faces the pore lumen. GABAA receptor α1 and β3 subunits were coexpressed with wild-type (wt) γ2L or mutant γ2L(P302L) subunits in HEK 293T cells and cultured mouse cortical neurons. We measured currents using whole-cell and single-channel patch clamp techniques, surface and total expression levels using surface biotinylation and Western blotting, and potential structural perturbations in mutant GABAA receptors using structural modeling...
January 2017: ENeuro
https://www.readbyqxmd.com/read/28194725/otophylloside-b-protects-against-a%C3%AE-toxicity-in-caenorhabditis-elegans-models-of-alzheimer-s-disease
#13
Jie Yang, Xiao-Bing Huang, Qin-Li Wan, Ai-Jun Ding, Zhong-Lin Yang, Ming-Hua Qiu, Hua-Ying Sun, Shu-Hua Qi, Huai-Rong Luo
Alzheimer's disease (AD) is a major public health concern worldwide and the few drugs currently available only treat the symptoms. Hence, there is a strong need to find more effective anti-AD agents. Cynanchum otophyllum is a traditional Chinese medicine for treating epilepsy, and otophylloside B (Ot B), isolated from C. otophyllum, is the essential active component. Having previously identified anti-aging effects of Ot B, we evaluated Ot B for AD prevention in C. elegans models of AD and found that Ot B extended lifespan, increased heat stress-resistance, delayed body paralysis, and increased the chemotaxis response...
February 13, 2017: Natural Products and Bioprospecting
https://www.readbyqxmd.com/read/28192756/scn1a-clinical-spectrum-includes-the-self-limited-focal-epilepsies-of-childhood
#14
Sara Kivity, Karen L Oliver, Zaid Afawi, John A Damiano, Todor Arsov, Melanie Bahlo, Samuel F Berkovic
INTRODUCTION: Amongst autosomal dominant genetic epilepsy with febrile seizures plus (GEFS+) families, SCN1A variants are the most common genetic cause. Initially regarded as a generalized form of epilepsy, the GEFS+ spectrum is now known to include some focal epilepsies, but it is generally not conceptualized as extending to the self-limited focal epilepsies of childhood, such as Panayiotopoulos syndrome. There are, however, three reports of SCN1A variants in Panayiotopoulos syndrome...
February 4, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28187749/identification-of-a-large-intronic-transposal-insertion-in-slc17a5-causing-sialic-acid-storage-disease
#15
Maja Tarailo-Graovac, Britt I Drögemöller, Wyeth W Wasserman, Colin J D Ross, Ans M W van den Ouweland, Niklas Darin, Gittan Kollberg, Clara D M van Karnebeek, Maria Blomqvist
BACKGROUND: Sialic acid storage diseases are neurodegenerative disorders characterized by accumulation of sialic acid in the lysosome. These disorders are caused by mutations in SLC17A5, the gene encoding sialin, a sialic acid transporter located in the lysosomal membrane. The most common form of sialic acid storage disease is the slowly progressive Salla disease, presenting with hypotonia, ataxia, epilepsy, nystagmus and findings of cerebral and cerebellar atrophy. Hypomyelination and corpus callosum hypoplasia are typical as well...
February 10, 2017: Orphanet Journal of Rare Diseases
https://www.readbyqxmd.com/read/28182637/comprehensive-target-capture-next-generation-sequencing-as-a-second-tier-diagnostic-approach-for-congenital-muscular-dystrophy-in-taiwan
#16
Wen-Chen Liang, Xia Tian, Chung-Yee Yuo, Wan-Zi Chen, Tsu-Min Kan, Yi-Ning Su, Ichizo Nishino, Lee-Jun C Wong, Yuh-Jyh Jong
PURPOSE: Congenital muscular dystrophy (CMD) is a heterogeneous disease entity. The detailed clinical manifestation and causative gene for each subgroup of CMD are quite variable. This study aims to analyze the phenotypes and genotypes of Taiwanese patients with CMD as the epidemiology of CMD varies among populations and has been scantly described in Asia. METHODS: A total of 48 patients suspected to have CMD were screened and categorized by histochemistry and immunohistochemistry studies...
2017: PloS One
https://www.readbyqxmd.com/read/28173649/-a-novel-mutation-in-kcnb1-gene-in-a-child-with-neuropsychiatric-comorbidities-with-both-intellectual-disability-and-epilepsy-and-review-of-literature
#17
P Miao, J Peng, C Chen, N Gai, F Yin
Objective: To explore the association between the phenotype and KCNB1 gene mutation. Method: Clinical information including physical features, laboratory and genetic data of one patient of mental retardation with refractory epilepsy from Department of Pediatrics, Xiangya Hospital in January 2016 was analyzed. This patient was discovered to have KCNB1 gene mutations through whole exome sequencing. Relevant information about KCNB1 gene mutation was searched and collected from Pubmed, CNKI, Human Gene Mutation Database(HGMD) and Online Mendelian Inheritance in Man(OMIM)...
February 2, 2017: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/28166369/heterozygous-truncation-mutations-of-the-smc1a-gene-cause-a-severe-early-onset-epilepsy-with-cluster-seizures-in-females-detailed-phenotyping-of-10-new-cases
#18
Joseph D Symonds, Shelagh Joss, Kay A Metcalfe, Suresh Somarathi, Jamie Cruden, Anita M Devlin, Alan Donaldson, Nataliya DiDonato, David Fitzpatrick, Frank J Kaiser, Anne K Lampe, Melissa M Lees, Ailsa McLellan, Tara Montgomery, Vivek Mundada, Lesley Nairn, Ajoy Sarkar, Jens Schallner, Jelena Pozojevic, Ilaria Parenti, Jeen Tan, Peter Turnpenny, William P Whitehouse, Sameer M Zuberi
OBJECTIVE: The phenotype of seizure clustering with febrile illnesses in infancy/early childhood is well recognized. To date the only genetic epilepsy consistently associated with this phenotype is PCDH19, an X-linked disorder restricted to females, and males with mosaicism. The SMC1A gene, which encodes a structural component of the cohesin complex is also located on the X chromosome. Missense variants and small in-frame deletions of SMC1A cause approximately 5% of Cornelia de Lange Syndrome (CdLS)...
February 6, 2017: Epilepsia
https://www.readbyqxmd.com/read/28165634/pharmacogenetics-of-antiepileptic-drug-efficacy-in-childhood-absence-epilepsy
#19
Tracy A Glauser, Katherine Holland, Valerie P O'Brien, Mehdi Keddache, Lisa J Martin, Peggy O Clark, Avital Cnaan, Dennis Dlugos, Deborah G Hirtz, Shlomo Shinnar, Gregory Grabowski
OBJECTIVE: Determine if common polymorphisms in CACNA1G, CACNA1H, CACNA1I, and ABCB1 are associated with differential short term seizure outcome in Childhood Absence Epilepsy (CAE). METHODS: 446 CAE children in a randomized double blind trial of ethosuximide, lamotrigine and valproate had short term seizure outcome determined. Associations between polymorphisms (minor allele frequency ≥15%) in four genes and seizure outcomes were assessed. In vitro electrophysiology on transfected CACNA1H channels determined impact of one variant on T-type calcium channel responsiveness to ethosuximide...
February 6, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28163158/neuron-subset-specific-pten-deletion-induces-abnormal-skeletal-activity-in-mice
#20
Joaquin N Lugo, Marjorie H Thompson, Philippe Huber, Gregory Smith, Ronald Y Kwon
Individuals with a history of epilepsy are at higher risk for bone fractures compared to the general population. Although clinical studies support an association between low bone mineral density (BMD) and anti-seizure medications, little is known on whether a history of seizures is linked to altered bone health. Therefore, in this study we tested the hypothesis that bone mass, morphology, and bone mineralization are altered by seizures in genetically epileptic animals and in animals subjected to an episode of status epilepticus...
February 2, 2017: Experimental Neurology
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