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Nocturnal frontal lobe epilepsy

Paolo Tinuper, Francesca Bisulli
Nocturnal frontal lobe epilepsy (NFLE) is a focal epilepsy with seizures arising mainly during sleep and characterized by complex, often bizarre, motor behavior or sustained dystonic posturing. First described in 1981, it was initially considered a motor disorder of sleep and was named nocturnal paroxysmal dystonia (NPD). The unusual seizure semiology, onset during sleep, and often uninformative scalp EEG and brain MRI make it difficult to distinguish NPD attacks from other non-epileptic nocturnal paroxysmal events, namely parasomnias...
December 15, 2016: Seizure: the Journal of the British Epilepsy Association
Rikke S Møller, Sarah Weckhuysen, Mathilde Chipaux, Elise Marsan, Valerie Taly, E Martina Bebin, Susan M Hiatt, Jeremy W Prokop, Kevin M Bowling, Davide Mei, Valerio Conti, Pierre de la Grange, Sarah Ferrand-Sorbets, Georg Dorfmüller, Virginie Lambrecq, Line H G Larsen, Eric Leguern, Renzo Guerrini, Guido Rubboli, Gregory M Cooper, Stéphanie Baulac
OBJECTIVE: To assess the prevalence of somatic MTOR mutations in focal cortical dysplasia (FCD) and of germline MTOR mutations in a broad range of epilepsies. METHODS: We collected 20 blood-brain paired samples from patients with FCD and searched for somatic variants using deep-targeted gene panel sequencing. Germline mutations in MTOR were assessed in a French research cohort of 93 probands with focal epilepsies and in a diagnostic Danish cohort of 245 patients with a broad range of epilepsies...
December 2016: Neurology. Genetics
Luca Vignatelli, Francesca Bisulli, Giada Giovannini, Laura Licchetta, Ilaria Naldi, Barbara Mostacci, Guido Rubboli, Federica Provini, Paolo Tinuper, Stefano Meletti
No abstract text is available yet for this article.
October 20, 2016: Sleep
Weston A Nichols, Brandon J Henderson, Christopher B Marotta, Caroline Y Yu, Chris Richards, Dennis A Dougherty, Henry A Lester, Bruce N Cohen
A number of mutations in α4β2-containing (α4β2*) nicotinic acetylcholine (ACh) receptors (nAChRs) are linked to autosomal dominant nocturnal frontal lobe epilepsy (ADNFLE), including one in the β2 subunit called β2V287L. Two α4β2* subtypes with different subunit stoichiometries and ACh sensitivities co-exist in the brain, a high-sensitivity subtype with (α4)2(β2)3 subunit stoichiometry and a low-sensitivity subtype with (α4)3(β2)2 stoichiometry. The α5 nicotinic subunit also co-assembles with α4β2 to form a high-sensitivity α5α4β2 nAChR...
2016: PloS One
Paolo Tinuper, Francesca Bisulli, J H Cross, Dale Hesdorffer, Philippe Kahane, Lino Nobili, Federica Provini, Ingrid E Scheffer, Laura Tassi, Luca Vignatelli, Claudio Bassetti, Fabio Cirignotta, Christopher Derry, Antonio Gambardella, Renzo Guerrini, Peter Halasz, Laura Licchetta, Mark Mahowald, Raffaele Manni, Carla Marini, Barbara Mostacci, Ilaria Naldi, Liborio Parrino, Fabienne Picard, Maura Pugliatti, Philippe Ryvlin, Federico Vigevano, Marco Zucconi, Samuel Berkovic, Ruth Ottman
The syndrome known as nocturnal frontal lobe epilepsy is recognized worldwide and has been studied in a wide range of clinical and scientific settings (epilepsy, sleep medicine, neurosurgery, pediatric neurology, epidemiology, genetics). Though uncommon, it is of considerable interest to practicing neurologists because of complexity in differential diagnosis from more common, benign sleep disorders such as parasomnias, or other disorders like psychogenic nonepileptic seizures. Moreover, misdiagnosis can have substantial adverse consequences on patients' lives...
May 10, 2016: Neurology
Xiao-Rong Liu, Dan Huang, Jie Wang, Yi-Fan Wang, Hui Sun, Bin Tang, Wen Li, Jin-Xing Lai, Na He, Mei Wu, Tao Su, Heng Meng, Yi-Wu Shi, Bing-Mei Li, Bei-Sha Tang, Wei-Ping Liao
OBJECTIVE: To explore the potential causative genes of paroxysmal hypnogenic dyskinesia (PHD), which was initially considered a subtype of paroxysmal dyskinesia and has been recently considered a form of nocturnal frontal lobe epilepsy (NFLE). METHODS: Eleven patients with PHD were recruited. Mutations in proline-rich region transmembrane protein-2 (PRRT2), myofibrillogenesis regulator 1 (MR-1), solute carrier family 2, member 1 (SLC2A1), calcium-activated potassium channel alpha subunit (KCNMA1), cholinergic receptor, nicotinic, alpha 4 (CHRNA4), cholinergic receptor, nicotinic, beta 2 (CHRNB2), cholinergic receptor, nicotinic, alpha 2 (CHRNA2), and potassium channel subfamily T member 1 (KCNT1) were screened by direct sequencing...
April 2016: Neurology. Genetics
Fábio A Nascimento, Felippe Borlot, Patrick Cossette, Berge A Minassian, Danielle M Andrade
The DEPDC5 gene (OMIM #614191), mapped to 22q12.2-q12.3, encodes the DEP domain-containing protein 5. DEPDC5 has been associated with a variety of familial epilepsies, including familial focal epilepsy with variable foci, autosomal dominant nocturnal frontal lobe epilepsy, familial temporal lobe epilepsy, epileptic spasms, and cortical dysplasia.(1-4) Notably, DEPDC5 has never been linked to increased risk of sudden unexpected death in epilepsy (SUDEP). We report a family with epilepsy due to DEPDC5 mutation and 2 definite cases of SUDEP within this family...
December 2015: Neurology. Genetics
Fieke M E Cox, Gert Jan Lammers, Roland D Thijs, Gerhard H Visser
No abstract text is available yet for this article.
April 5, 2016: Neurology
András Horváth, Anikó Papp, Anna Szűcs
Nonrapid eye movement (NREM) or arousal parasomnias are prevalent conditions in children and young adults, apparently provoked by any medical, physical, mental, or pharmacologic/toxic agent disturbing normal biorhythm and causing sleep fragmentation or abundant amount of slow wave sleep. The nadir and the ascending slope of the first sleep cycle of night sleep are the typical periods when NREM parasomnias, especially sleepwalking may occur on sleep-microstructural level; microarousals are the typical moments allowing NREM parasomnias...
2016: Nature and Science of Sleep
Georg-Christoph Korenke, Marlene Eggert, Holger Thiele, Peter Nürnberg, Thomas Sander, Ortrud K Steinlein
Mutations in NPRL3, one of three genes that encode proteins of the mTORC1-regulating GATOR1 complex, have recently been reported to cause cortical dysplasia with focal epilepsy. We have now analyzed a multiplex epilepsy family by whole exome sequencing and identified a frameshift mutation (NM_001077350.2; c.1522delG; p.E508Rfs*46) within exon 13 of NPRL3. This truncating mutation causes an epilepsy phenotype characterized by early childhood onset of mainly nocturnal frontal lobe epilepsy. The penetrance in our family was low (three affected out of six mutation carriers), compared to families with either ion channel- or DEPDC5-associated familial nocturnal frontal lobe epilepsy...
March 2016: Epilepsia
Chiao Xin Lim, Michael G Ricos, Leanne M Dibbens, Sarah E Heron
Mutations in the sodium-gated potassium channel subunit gene KCNT1 have recently emerged as a cause of several different epileptic disorders. This review describes the mutational and phenotypic spectrum associated with the gene and discusses the comorbidities found in patients, which include intellectual disability and psychiatric features. The gene may also be linked with cardiac disorders. KCNT1 missense mutations have been found in 39% of patients with the epileptic encephalopathy malignant migrating focal seizures of infancy (MMFSI), making it the most significant MMFSI disease-causing gene identified to date...
April 2016: Journal of Medical Genetics
Nikesh Ardeshna
No abstract text is available yet for this article.
September 2015: Neurodiagnostic Journal
Maegan M Weltzin, Jon M Lindstrom, Ronald J Lukas, Paul Whiteaker
Previously characterized nicotinic acetylcholine receptor (nAChR) autosomal dominant nocturnal frontal lobe epilepsy (ADNFLE)-associated mutations are found in α2, α4 and β2 subunit transmembrane (TM) domains. They predominantly increase ACh potency and, for β2-subunit mutants, increase macroscopic currents. Two recently-identified mutations, α4(R336H) and β2(V337G), located in the intracellular cytoplasmic loop (C2) have been associated with non-familial NFLE. Effects of these mutations on α4β2-nAChR function and expression were studied for the first time, using two-electrode voltage clamp recordings in Xenopus laevis oocytes...
March 2016: Neuropharmacology
Shih-Bin Yeh, Carlos H Schenck
OBJECTIVE: To present findings on a series of cases of sporadic nocturnal frontal lobe epilepsy (NFLE), a form of NFLE that is infrequently reported, in contrast to familial (autosomal dominant) NFLE. Both forms of NFLE need to be distinguished from parasomnias, nocturnal temporal lobe epilepsy, and other nocturnal disorders. METHODS: Eight consecutive cases of sporadic NFLE were evaluated at a sleep clinic in Taiwan. All patients had clinical evaluations, daytime waking and sleeping EEGs, brain MRIs, and overnight video-polysomnography (vPSG) with seizure montage...
September 2014: Sleep Science
Michael S Hildebrand, Rick Tankard, Elena V Gazina, John A Damiano, Kate M Lawrence, Hans-Henrik M Dahl, Brigid M Regan, Aiden Eliot Shearer, Richard J H Smith, Carla Marini, Renzo Guerrini, Angelo Labate, Antonio Gambardella, Paolo Tinuper, Laura Lichetta, Sara Baldassari, Francesca Bisulli, Tommaso Pippucci, Ingrid E Scheffer, Christopher A Reid, Steven Petrou, Melanie Bahlo, Samuel F Berkovic
OBJECTIVE: Nocturnal frontal lobe epilepsy (NFLE) can be sporadic or autosomal dominant; some families have nicotinic acetylcholine receptor subunit mutations. We report a novel autosomal recessive phenotype in a single family and identify the causative gene. METHODS: Whole exome sequencing data was used to map the family, thereby narrowing exome search space, and then to identify the mutation. RESULTS: Linkage analysis using exome sequence data from two affected and two unaffected subjects showed homozygous linkage peaks on chromosomes 7, 8, 13, and 14 with maximum LOD scores between 1...
August 2015: Annals of Clinical and Translational Neurology
Devraj Chavda, Rajkumar Agarwal, Jun Park
No abstract text is available yet for this article.
September 2015: Journal of Pediatrics
Zhihong Chen, Lingan Wang, Chun Wang, Qian Chen, Qiongxiang Zhai, Yuxiong Guo, Yuxin Zhang
OBJECTIVE: The present study aims to investigate the gene mutations of CHRNB2, CHRNA2 and CHRNA4 in Chinese population with autosomal dominant nocturnal frontal lobe epilepsy (ADNFLE). METHODS: 257 ADNFLE patients (74 sporadic and 32 familial) were collected, including 42 pedigree patients and 215 sporadic cases. Exon mutational screening of CHRNB2, CHRNA2 and CHRNA4 was performed by direct PCR sequencing. RESULTS: No published mutations of CHRNB2, CHRNA4 and CHRNA2 genes were detected in this study...
2015: International Journal of Clinical and Experimental Medicine
Kiyohide Usami, Riki Matsumoto, Katsuya Kobayashi, Takefumi Hitomi, Akihiro Shimotake, Takayuki Kikuchi, Masao Matsuhashi, Takeharu Kunieda, Nobuhiro Mikuni, Susumu Miyamoto, Hidenao Fukuyama, Ryosuke Takahashi, Akio Ikeda
Sleep-induced changes in human brain connectivity/excitability and their physiologic basis remain unclear, especially in the frontal lobe. We investigated sleep-induced connectivity and excitability changes in 11 patients who underwent chronic implantation of subdural electrodes for epilepsy surgery. Single-pulse electrical stimuli were directly injected to a part of the cortices, and cortico-cortical evoked potentials (CCEPs) and CCEP-related high-gamma activities (HGA: 100-200 Hz) were recorded from adjacent and remote cortices as proxies of effective connectivity and induced neuronal activity, respectively...
November 2015: Human Brain Mapping
Péter Halász
System epilepsy is an emerging concept interpreting major nonlesional epilepsies as epileptic dysfunctions of physiological systems. I extend here the concept of reflex epilepsy to epilepsies linked to input dependent physiological systems. Experimental and clinical reseach data were collected to create a coherent explanation of underlying pathomechanism in AE and NFLE. We propose that AE should be interpreted as epilepsy linked to the corticothalamic burst-firing mode of NREM sleep, released by evoked vigilance level oscillations characterized by reactive slow wave response...
2015: Behavioural Neurology
Chihiro Ohba, Mitsuhiro Kato, Nobuya Takahashi, Hitoshi Osaka, Takashi Shiihara, Jun Tohyama, Shin Nabatame, Junji Azuma, Yuji Fujii, Munetsugu Hara, Reimi Tsurusawa, Takahito Inoue, Reina Ogata, Yoriko Watanabe, Noriko Togashi, Hirofumi Kodera, Mitsuko Nakashima, Yoshinori Tsurusaki, Noriko Miyake, Fumiaki Tanaka, Hirotomo Saitsu, Naomichi Matsumoto
KCNT1 mutations have been found in epilepsy of infancy with migrating focal seizures (EIMFS; also known as migrating partial seizures in infancy), autosomal dominant nocturnal frontal lobe epilepsy, and other types of early onset epileptic encephalopathies (EOEEs). We performed KCNT1-targeted next-generation sequencing (207 samples) and/or whole-exome sequencing (229 samples) in a total of 362 patients with Ohtahara syndrome, West syndrome, EIMFS, or unclassified EOEEs. We identified nine heterozygous KCNT1 mutations in 11 patients: nine of 18 EIMFS cases (50%) in whom migrating foci were observed, one of 180 West syndrome cases (0...
September 2015: Epilepsia
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