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Pyridoxine dependent epilepsy

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https://www.readbyqxmd.com/read/27882480/phenotype-biochemical-features-genotype-and-treatment-outcome-of-pyridoxine-dependent-epilepsy
#1
Amal Al Teneiji, Theodora U J Bruun, Dawn Cordeiro, Jaina Patel, Michal Inbar-Feigenberg, Shelly Weiss, Eduard Struys, Saadet Mercimek-Mahmutoglu
We report treatment outcome of eleven patients with pyridoxine-dependent epilepsy caused by pathogenic variants in ALDH7A1 (PDE-ALDH7A1). We developed a clinical severity score to compare phenotype with biochemical features, genotype and delays in the initiation of pyridoxine. Clinical severity score included 1) global developmental delay/ intellectual disability; 2) age of seizure onset prior to pyridoxine; 3) current seizures on treatment. Phenotype scored 1-3 = mild; 4-6 = moderate; and 7-9 = severe...
November 23, 2016: Metabolic Brain Disease
https://www.readbyqxmd.com/read/27857784/pyridoxine-dependent-convulsions-among-children-with-refractory-seizures-a-3-year-follow-up-study
#2
Sadanandavalli Retnaswami Chandra, Thomas Gregor Issac, Sai Deepak, Ravi Teja, Seby Kuruthukulangara
INTRODUCTION: Epilepsy accounts for 1% of the global disease burden and about 8-10 million epilepsy patients live in India. About 30-40% of these patients become drug-resistant and land up with palliative or disease-modifying surgeries. This is a situation causing great concern in view of the psychosocial and economic burden on the patient and the family apart from severe cognitive and motor consequences, especially in children. Therefore, it is mandatory to have an insight into the wide spectrum of causes with reference to refractoriness to antiepileptic medications in children with epilepsy...
July 2016: Journal of Pediatric Neurosciences
https://www.readbyqxmd.com/read/27856333/novel-homozygous-missense-mutation-in-aldh7a1-causes-neonatal-pyridoxine-dependent-epilepsy
#3
Emanuele G Coci, Luca Codutti, Christian Fink, Sophie Bartsch, Gunnar Grüning, Thomas Lücke, Ingo Kurth, Joachim Riedel
Pyridoxine dependent epilepsy (PDE) (OMIM#266100) is a neonatal form of epilepsy, caused by dysfunction of the enzyme α-aminoadipic semialdehyde dehydrogenase (ALDH7A1 or Antiquitin). This enzyme converts α-aminoadipic semialdehyde (α-AASA) into α-aminoadipate (AAA), a critical step in the lysine metabolism of the brain. ALDH7A1 dysfunction causes an accumulation of α-AASA and δ(1)-piperideine-6-carboxylic acid (P6C), which are in equilibrium with each other. P6C binds and inactivates pyridoxal 5'-phosphate (PLP), the active form of pyridoxine...
November 14, 2016: Molecular and Cellular Probes
https://www.readbyqxmd.com/read/27806798/-pyridoxine-dependent-epilepsy-with-atypical-clinical-presentation
#4
J Xue, Z X Yang, S Wang
No abstract text is available yet for this article.
November 2, 2016: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/27615426/mouse-lysine-catabolism-to-aminoadipate-occurs-primarily-through-the-saccharopine-pathway-implications-for-pyridoxine-dependent-epilepsy-pde
#5
Izabella Agostinho Pena, Lygia Azevedo Marques, Ângelo B A Laranjeira, José A Yunes, Marcos N Eberlin, Alex MacKenzie, Paulo Arruda
Lysine is catabolized in mammals through the saccharopine and pipecolate pathways - the former is mainly hepatic and renal, and the latter is believed to play a role in the cerebral lysine oxidation. Both pathways lead to the formation of aminoadipic semialdehyde (AASA) that is then oxidized to aminoadipate (AAA) by antiquitin (ALDH7A1). Mutations in the ALDH7A1 gene result in the accumulation of AASA and its cyclic form, piperideine-6-carboxylate (P6C), which causes pyridoxine-dependent epilepsy (PDE). P6C reacts with pyridoxal 5'-phosphate (PLP) causing its inactivation...
September 8, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27544473/amenable-treatable-severe-pediatric-epilepsies
#6
Phillip L Pearl
Vitamin-dependent epilepsies and multiple metabolic epilepsies are amenable to treatment that markedly improves the disease course. Knowledge of these amenably treatable severe pediatric epilepsies allows for early identification, testing, and treatment. These disorders present with various phenotypes, including early onset epileptic encephalopathy (refractory neonatal seizures, early myoclonic encephalopathy, and early infantile epileptic encephalopathy), infantile spasms, or mixed generalized seizure types in infancy, childhood, or even adolescence and adulthood...
May 2016: Seminars in Pediatric Neurology
https://www.readbyqxmd.com/read/27522229/epileptic-phenotype-of-two-siblings-with-asparagine-synthesis-deficiency-mimics-neonatal-pyridoxine-dependent-epilepsy
#7
Svetlana Gataullina, Julia Lauer-Zillhardt, Anna Kaminska, Louise Galmiche-Rolland, Nadia Bahi-Buisson, Clément Pontoizeau, Chris Ottolenghi, Olivier Dulac, Catherine Fallet-Bianco
We report the cases of a brother and a sister of nonconsanguineous parents who developed progressive microcephaly and had tremor, irritability, spasticity, startle reflexes, and permanent erratic myoclonus since birth. Focal clonic seizures, status epilepticus, and infantile spasms appeared later, during the first months of life, while erratic myoclonic jerks persisted. Electroencephalogram initially showed multifocal spikes that evolved into modified hypsarrhythmia and then discontinuous activity, evoking the progressive nature of the condition...
December 2016: Neuropediatrics
https://www.readbyqxmd.com/read/27510871/-clinical-and-genetic-characteristics-and-detection-of-urinary-pipecolic-acid-in-pyridoxine-dependent-epilepsy
#8
J Xue, Z X Yang, H Li, P Qian, Y Wu, Y W Jiang, X Y Liu
OBJECTIVE: To analyze the clinical and genetic characteristics of patients with pyridoxine dependent epilepsy (PDE), and build a method to detect and analyze the concentration of urinary pipecolic acid in PDE patients receiving pyridoxine treatment. METHOD: Twelve patients (8 were male, 4 were female) were diagnosed as PDE in Peking University First Hospital between April 2012 and September 2015. The clinical manifestations, diagnosis and treatment process, video-electroencephalogram, magnetic resonance imaging were retrospectively analyzed...
August 2016: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/27438048/pyridoxine-dependent-epilepsy-report-on-three-families-with-neuropathology
#9
Florent Marguet, Hager Barakizou, Abdellah Tebani, Lenaig Abily-Donval, Stéphanie Torre, Fethi Bayoudh, Sami Jebnoun, Marie Brasseur-Daudruy, Stéphane Marret, Annie Laquerriere, Soumeya Bekri
Pyridoxine-dependent epilepsy (PDE) is a pharmacoresistant epileptogenic encephalopathy controlled by pyridoxine supplementation at pharmacological doses. Despite supplementation, the long-term outcome is often poor possibly because of recurrent seizures and developmental structural brain abnormalities. We report on five patients with PDE from three unrelated families. The diagnosis was confirmed by ALDH7A1 sequencing, which allowed for the characterization of two homozygous variations [NM_001182.3:c.1279G > C - p...
July 20, 2016: Metabolic Brain Disease
https://www.readbyqxmd.com/read/27342130/the-value-of-plasma-vitamin-b6-profiles-in-early-onset-epileptic-encephalopathies
#10
Déborah Mathis, Lucia Abela, Monique Albersen, Céline Bürer, Lisa Crowther, Karin Beese, Hans Hartmann, Levinus A Bok, Eduard Struys, Sorina M Papuc, Anita Rauch, Martin Hersberger, Nanda M Verhoeven-Duif, Barbara Plecko
BACKGROUND: Recent decades have unravelled the molecular background of a number of inborn errors of metabolism (IEM) causing vitamin B6-dependent epilepsy. As these defects interfere with vitamin B6 metabolism by different mechanisms, the plasma vitamin B6 profile can give important clues for further molecular work-up. This has so far been investigated in only a small number of patients. METHODS: We evaluated the vitamin B6 vitamers pyridoxal 5'-phosphate (PLP), pyridoxal (PL), pyridoxamine (PM), pyridoxine (PN) and the catabolite pyridoxic acid (PA) in the so far largest patient cohort: reference (n = 50); pyridox(am)ine 5'-phosphate oxidase (PNPO) deficiency (n = 6); antiquitin (ATQ) deficiency (n = 21); tissue non-specific alkaline phosphatase (TNSALP) deficiency (n = 2) and epileptic encephalopathy (EE) of unknown etiology tested negative for ATQ and PNPO deficiency (n = 64)...
September 2016: Journal of Inherited Metabolic Disease
https://www.readbyqxmd.com/read/27324284/effect-of-dietary-lysine-restriction-and-arginine-supplementation-in-two-patients-with-pyridoxine-dependent-epilepsy
#11
Tatiana Yuzyuk, Amanda Thomas, Krista Viau, Aiping Liu, Irene De Biase, Lorenzo D Botto, Marzia Pasquali, Nicola Longo
Pyridoxine-Dependent Epilepsy (PDE) is a recessive disorder caused by deficiency of α-aminoadipic semialdehyde dehydrogenase in the catabolic pathway of lysine. It is characterized by intractable seizures controlled by the administration of pharmacological doses of vitamin B6. Despite seizure control with pyridoxine, intellectual disability and developmental delays are still observed in some patients with PDE, likely due to the accumulation of toxic intermediates in the lysine catabolic pathway: alpha-aminoadipic semialdehyde (AASA), delta-1-piperideine-6-carboxylate (P6C), and pipecolic acid...
July 2016: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/27242398/neuropathological-mechanisms-of-seizures-in-autism-spectrum-disorder
#12
REVIEW
Richard E Frye, Manuel F Casanova, S Hossein Fatemi, Timothy D Folsom, Teri J Reutiman, Gregory L Brown, Stephen M Edelson, John C Slattery, James B Adams
This manuscript reviews biological abnormalities shared by autism spectrum disorder (ASD) and epilepsy. Two neuropathological findings are shared by ASD and epilepsy: abnormalities in minicolumn architecture and γ-aminobutyric acid (GABA) neurotransmission. The peripheral neuropil, which is the region that contains the inhibition circuits of the minicolumns, has been found to be decreased in the post-mortem ASD brain. ASD and epilepsy are associated with inhibitory GABA neurotransmission abnormalities including reduced GABAA and GABAB subunit expression...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27212567/a-prospective-case-study-of-the-safety-and-efficacy-of-lysine-restricted-diet-and-arginine-supplementation-therapy-in-a-patient-with-pyridoxine-dependent-epilepsy-caused-by-mutations-in-aldh7a1
#13
Muhammad Mahajnah, Dawn Corderio, Valerie Austin, Sarah Herd, Carly Mutch, Melissa Carter, Eduard Struys, Saadet Mercimek-Mahmutoglu
BACKGROUND: Pyridoxine-dependent epilepsy (PDE) is caused by mutations in ALDH7A1 (PDE-ALDH7A1), which encodes α-aminoadipic semialdehyde dehydrogenase in the lysine catabolic pathway, resulting in accumulation of α-aminoadipic-acid-semialdehyde. PATIENT DESCRIPTION AND RESULTS: We present a three-year treatment outcome of a child with PDE-ALDH7A1 on pyridoxine (started at age three weeks of age), lysine-restricted diet (started at age seven months), and arginine supplementation therapy (started at age 26 months)...
July 2016: Pediatric Neurology
https://www.readbyqxmd.com/read/27186704/pyridoxine-dependent-epilepsy-in-two-turkish-patients-in-turkey-and-review-of-the-literature
#14
Gülen Gül-Mert, Faruk İncecik, M Özlem Hergüner, Serdar Ceylaner, Şakir Altunbaşak
Pyridoxine-dependent epilepsy (PDE) is a rare autosomal recessive enzyme defect in the vitamin B6 metabolism characterized by intractable seizures which are usually resistant to all antiepileptic drugs but respond to pharmacological doses of pyridoxine. We present the clinical and molecular genetic findings of two patients with c.1597_1597delG mutations in ALDH7A1 gene. There are different clinical phenotypes in PDE: patients with complete seizure control with pyridoxine and normal development (group 1), patients with complete seizure control with pyridoxine and development delay (group 2), and patients with persistent seizures despite pyridoxine treatment and with development delay (group 3)...
July 2015: Turkish Journal of Pediatrics
https://www.readbyqxmd.com/read/27026869/simultaneous-detection-of-lysine-metabolites-by-a-single-lc-ms-ms-method-monitoring-lysine-degradation-in-mouse-plasma
#15
Izabella A Pena, Lygia A Marques, Angelo B A Laranjeira, José A Yunes, Marcos N Eberlin, Paulo Arruda
Detection and quantification of lysine degradation metabolites in plasma is necessary for the diagnosis and follow-up of diseases such as pyridoxine-dependent epilepsy. The principal metabolites involved in the disease are related to the first steps of lysine oxidation, either through the saccharopine or the pipecolate pathways. Currently, there are three different analytical methods used to assess the content of these metabolites in urine and plasma, but they require different sample preparations and analytical equipment...
2016: SpringerPlus
https://www.readbyqxmd.com/read/26995068/pyridoxine-dependent-epilepsy-an-expanding-clinical-spectrum
#16
REVIEW
Clara D M van Karnebeek, Sylvia A Tiebout, Jikkemien Niermeijer, Bwee Tien Poll-The, Aisha Ghani, Curtis R Coughlin, Johan L K Van Hove, Jost Wigand Richter, Hans Juergen Christen, Renata Gallagher, Hans Hartmann, Sylvia Stockler-Ipsiroglu
BACKGROUND: Pyridoxine-dependent epilepsy is a rare autosomal recessive epileptic encephalopathy caused by antiquitin (ALDH7A1) deficiency. In spite of adequate seizure control, 75% of patients suffer intellectual developmental disability. Antiquitin deficiency affects lysine catabolism resulting in accumulation of α-aminoadipic semialdehyde/pyrroline 6' carboxylate and pipecolic acid. Beside neonatal refractory epileptic encephalopathy, numerous neurological manifestations and metabolic/biochemical findings have been reported...
June 2016: Pediatric Neurology
https://www.readbyqxmd.com/read/26970849/a-novel-method-for-simultaneous-quantification-of-alpha-aminoadipic-semialdehyde-piperideine-6-carboxylate-and-pipecolic-acid-in-plasma-and-urine
#17
Tatiana Yuzyuk, Aiping Liu, Amanda Thomas, JoDell E Wilson, Irene De Biase, Nicola Longo, Marzia Pasquali
OBJECTIVES: Elevated levels of pipecolic acid (PA), α-aminoadipic semialdehyde (AASA) and its cyclic form Δ1-piperideine-6-carboxylate (P6C) are characteristic of pyridoxine dependent epilepsy (PDE), a rare disorder of inborn error of metabolism. Recent studies showed the effectiveness of dietary therapy in PDE patients and emphasized the importance of the assessment of these metabolites for monitoring treatment efficacy. The objective of this study was to develop a robust and sensitive method for simultaneous quantification of AASA-P6C and PA in plasma and urine...
April 1, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/26943461/a-15-year-old-with-seizures-late-diagnosis-of-pyridoxine-dependent-epilepsy
#18
Debopam Samanta
No abstract text is available yet for this article.
March 4, 2016: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/26693506/saxs-fingerprints-of-aldehyde-dehydrogenase-oligomers
#19
John J Tanner
Enzymes of the aldehyde dehydrogenase (ALDH) superfamily catalyze the nicotinamide adenine dinucleotide-dependent oxidation of aldehydes to carboxylic acids. ALDHs are important in detoxification of aldehydes, amino acid metabolism, embryogenesis and development, neurotransmission, oxidative stress, and cancer. Mutations in genes encoding ALDHs cause metabolic disorders, including alcohol flush reaction (ALDH2), Sjögren-Larsson syndrome (ALDH3A2), hyperprolinemia type II (ALDH4A1), γ-hydroxybutyric aciduria (ALDH5A1), methylmalonic aciduria (ALDH6A1), pyridoxine dependent epilepsy (ALDH7A1), and hyperammonemia (ALDH18A1)...
December 2015: Data in Brief
https://www.readbyqxmd.com/read/26656780/hlf-is-a-genetic-modifier-of-epilepsy-caused-by-voltage-gated-sodium-channel-mutations
#20
Nicole A Hawkins, Jennifer A Kearney
Mutations in voltage-gated sodium channel genes cause several types of human epilepsies. Often, individuals with the same sodium channel mutation exhibit diverse phenotypes. This suggests that factors beyond the primary mutation influence disease severity, including genetic modifiers. Mouse epilepsy models with voltage-gated sodium channel mutations exhibit strain-dependent phenotype variability, supporting a contribution of genetic modifiers in epilepsy. The Scn2a(Q54) (Q54) mouse model has a strain-dependent epilepsy phenotype...
January 2016: Epilepsy Research
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