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Neurogenetics

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https://www.readbyqxmd.com/read/29754261/compound-heterozygous-mutations-in-two-different-domains-of-aldh18a1-do-not-affect-the-amino-acid-levels-in-a-patient-with-hereditary-spastic-paraplegia
#1
Maria Steenhof, Maria Kibæk, Martin J Larsen, Mette Christensen, Allan Meldgaard Lund, Klaus Brusgaard, Jens Michael Hertz
Mutations in ALDH18A1 can cause autosomal recessive and dominant hereditary spastic paraplegia and autosomal recessive and dominant cutis laxa. ALDH18A1 encodes delta-1-pyrroline-5-carboxylate synthetase (P5CS), which consists of two domains, the glutamate 5-kinase (G5K) and the gamma-glutamyl phosphate reductase (GR5P) domain. The location of the mutations in the gene has influence on whether the amino acid levels are affected. Mutations affecting the G5K domain have previously been found to cause reduced plasma levels of proline, citrulline and arginine, whereas such effect is not seen with mutations affecting the GR5P domain...
May 12, 2018: Neurogenetics
https://www.readbyqxmd.com/read/29730780/toward-deciphering-the-mechanistic-role-of-variations-in-the-rep1-repeat-site-in-the-transcription-regulation-of-snca-gene
#2
A Afek, L Tagliafierro, O C Glenn, D B Lukatsky, R Gordan, O Chiba-Falek
Short structural variants-variants other than single nucleotide polymorphisms-are hypothesized to contribute to many complex diseases, possibly by modulating gene expression. However, the molecular mechanisms by which noncoding short structural variants exert their effects on gene regulation have not been discovered. Here, we study simple sequence repeats (SSRs), a common class of short structural variants. Previously, we showed that repetitive sequences can directly influence the binding of transcription factors to their proximate recognition sites, a mechanism we termed non-consensus binding...
May 5, 2018: Neurogenetics
https://www.readbyqxmd.com/read/29691679/the-impact-of-next-generation-sequencing-on-the-diagnosis-of-pediatric-onset-hereditary-spastic-paraplegias-new-genotype-phenotype-correlations-for-rare-hsp-related-genes
#3
Lorena Travaglini, Chiara Aiello, Fabrizia Stregapede, Adele D'Amico, Viola Alesi, Andrea Ciolfi, Alessandro Bruselles, Michela Catteruccia, Simone Pizzi, Ginevra Zanni, Sara Loddo, Sabina Barresi, Gessica Vasco, Marco Tartaglia, Enrico Bertini, Francesco Nicita
Hereditary spastic paraplegias (HSP) are clinical and genetic heterogeneous diseases with more than 80 disease genes identified thus far. Studies on large cohorts of HSP patients showed that, by means of current technologies, the percentage of genetically solved cases is close to 50%. Notably, the percentage of molecularly confirmed diagnoses decreases significantly in sporadic patients. To describe our diagnostic molecular genetic approach on patients with pediatric-onset pure and complex HSP, 47 subjects with HSP underwent molecular screening of 113 known and candidate disease genes by targeted capture and massively parallel sequencing...
April 24, 2018: Neurogenetics
https://www.readbyqxmd.com/read/29589152/genetic-test-utilization-and-diagnostic-yield-in-adult-patients-with-neurological-disorders
#4
Tanya M Bardakjian, Ingo Helbig, Colin Quinn, Lauren B Elman, Leo F McCluskey, Steven S Scherer, Pedro Gonzalez-Alegre
To determine the diagnostic yield of different genetic test modalities in adult patients with neurological disorders, we evaluated all adult patients seen for genetic diagnostic evaluation in the outpatient neurology practice at the University of Pennsylvania between January 2016 and April 2017 as part of the newly created Penn Neurogenetics Program. Subjects were identified through our electronic medical system as those evaluated by the Program's single clinical genetic counselor in that period. A total of 377 patients were evaluated by the Penn Neurogenetics Program in different settings and genetic testing recommended...
March 28, 2018: Neurogenetics
https://www.readbyqxmd.com/read/29480378/reply-to-letter-to-editor-by-finsterer-j-and-zarrouk-mahjoub-s-phenotypic-manifestations-of-the-m-8969g-a-variant
#5
LETTER
Pirjo Isohanni, Christopher J Carroll, Christopher B Jackson, Max Pohjanpelto, Tuula Lönnqvist, Anu Suomalainen
No abstract text is available yet for this article.
February 26, 2018: Neurogenetics
https://www.readbyqxmd.com/read/29480377/phenotypic-manifestations-of-the-m-8969g-a-variant
#6
LETTER
Josef Finsterer, Sinda Zarrouk-Mahjoub
No abstract text is available yet for this article.
February 26, 2018: Neurogenetics
https://www.readbyqxmd.com/read/29549527/in-vitro-efficacy-of-arq-092-an-allosteric-akt-inhibitor-on-primary-fibroblast-cells-derived-from-patients-with-pik3ca-related-overgrowth-spectrum-pros
#7
C Ranieri, S Di Tommaso, D C Loconte, V Grossi, P Sanese, R Bagnulo, F C Susca, G Forte, A Peserico, A De Luisi, A Bartuli, A Selicorni, D Melis, M Lerone, A D Praticò, G Abbadessa, Y Yu, B Schwartz, Martino Ruggieri, Cristiano Simone, Nicoletta Resta
Postzygotic mutations of the PIK3CA [phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit alpha] gene constitutively activate the PI3K/AKT/mTOR pathway in PIK3CA-related overgrowth spectrum (PROS) patients, causing congenital mosaic tissue overgrowth that even multiple surgeries cannot solve. mTOR inhibitors are empirically tested and given for compassionate use in these patients. PROS patients could be ideal candidates for enrolment in trials with PI3K/AKT pathway inhibitors, considering the "clean" cellular setting in which a unique driver, a PIK3CA mutation, is present...
May 2018: Neurogenetics
https://www.readbyqxmd.com/read/29511999/med13l-related-intellectual-disability-involvement-of-missense-variants-and-delineation-of-the-phenotype
#8
T Smol, F Petit, A Piton, B Keren, D Sanlaville, A Afenjar, S Baker, E C Bedoukian, E J Bhoj, D Bonneau, E Boudry-Labis, S Bouquillon, O Boute-Benejean, R Caumes, N Chatron, C Colson, C Coubes, C Coutton, F Devillard, A Dieux-Coeslier, M Doco-Fenzy, L J Ewans, L Faivre, E Fassi, M Field, C Fournier, C Francannet, D Genevieve, I Giurgea, A Goldenberg, A K Green, A M Guerrot, D Heron, B Isidor, B A Keena, B L Krock, P Kuentz, E Lapi, N Le Meur, G Lesca, D Li, I Marey, C Mignot, C Nava, A Nesbitt, G Nicolas, C Roche-Lestienne, T Roscioli, V Satre, A Santani, M Stefanova, S Steinwall Larsen, P Saugier-Veber, S Picker-Minh, C Thuillier, A Verloes, G Vieville, M Wenzel, M Willems, S Whalen, Y A Zarate, A Ziegler, S Manouvrier-Hanu, V M Kalscheuer, B Gerard, Jamal Ghoumid
Molecular anomalies in MED13L, leading to haploinsufficiency, have been reported in patients with moderate to severe intellectual disability (ID) and distinct facial features, with or without congenital heart defects. Phenotype of the patients was referred to "MED13L haploinsufficiency syndrome." Missense variants in MED13L were already previously described to cause the MED13L-related syndrome, but only in a limited number of patients. Here we report 36 patients with MED13L molecular anomaly, recruited through an international collaboration between centers of expertise for developmental anomalies...
May 2018: Neurogenetics
https://www.readbyqxmd.com/read/29423566/clinical-and-neuroimaging-features-of-autosomal-recessive-spastic-paraplegia-35-spg35-case-reports-new-mutations-and-brief-literature-review
#9
Francesco Mari, Beatrice Berti, Alessandro Romano, Jacopo Baldacci, Riccardo Rizzi, M Grazia Alessandrì, Alessandra Tessa, Elena Procopio, Anna Rubegni, Charles Marques Lourenḉo, Alessandro Simonati, Renzo Guerrini, Filippo Maria Santorelli
Spastic paraplegia 35 (SPG35) is a recessive condition characterized by childhood onset, progressive course, complicated by dystonia, dysarthria, cognitive impairment, and epilepsy. Mutations in the FA2H gene have been described in several families, leading to the proposal of a single entity, named fatty acid hydrolase-associated neurodegeneration (FAHN). Several reports have described a polymorphic radiological picture with white matter lesions of various degrees and a distinct form of neurodegeneration with brain iron accumulation...
February 8, 2018: Neurogenetics
https://www.readbyqxmd.com/read/29396836/wes-homozygosity-mapping-in-a-recessive-form-of-charcot-marie-tooth-neuropathy-reveals-intronic-gdap1-variant-leading-to-a-premature-stop-codon
#10
Marion Masingue, Jimmy Perrot, Robert-Yves Carlier, Guenaelle Piguet-Lacroix, Philippe Latour, Tanya Stojkovic
Charcot-Marie-Tooth disease (CMT) refers to a group of clinically and genetically heterogeneous inherited neuropathies. Ganglioside-induced differentiation-associated protein 1 GDAP1-related CMT has been reported in an autosomal dominant or recessive form in patients presenting either axonal or demyelinating neuropathy. We report two Sri Lankan sisters born to consanguineous parents and presenting with a severe axonal sensorimotor neuropathy. The early onset of the disease, the distal and proximal weakness and atrophy leading to major disability, along with areflexia, and, most notably, vocal cord and diaphragm paralysis were highly evocative of a GDAP1-related CMT...
February 2, 2018: Neurogenetics
https://www.readbyqxmd.com/read/29350304/defective-mitochondrial-atpase-due-to-rare-mtdna-m-8969g-a-mutation-causing-lactic-acidosis-intellectual-disability-and-poor-growth
#11
Pirjo Isohanni, Christopher J Carroll, Christopher B Jackson, Max Pohjanpelto, Tuula Lönnqvist, Anu Suomalainen
Mutations in mitochondrial ATP synthase 6 (MT-ATP6) are a frequent cause of NARP (neurogenic muscle weakness, ataxia, and retinitis pigmentosa) or Leigh syndromes, especially a point mutation at nucleotide position 8993. M.8969G>A is a rare MT-ATP6 mutation, previously reported only in three individuals, causing multisystem disorders with mitochondrial myopathy, lactic acidosis, and sideroblastic anemia or IgA nephropathy. We present two siblings with the m.8969G>A mutation and a novel, substantially milder phenotype with lactic acidosis, poor growth, and intellectual disability...
January 2018: Neurogenetics
https://www.readbyqxmd.com/read/29322350/monogenic-disorders-that-mimic-the-phenotype-of-rett-syndrome
#12
Siddharth Srivastava, Sonal Desai, Julie Cohen, Constance Smith-Hicks, Kristin Barañano, Ali Fatemi, SakkuBai Naidu
Rett syndrome (RTT) is caused by mutations in methyl-CpG-binding protein 2 (MECP2), but defects in a handful of other genes (e.g., CDKL5, FOXG1, MEF2C) can lead to presentations that resemble, but do not completely mirror, classical RTT. In this study, we attempted to identify other monogenic disorders that share features with RTT. We performed a retrospective chart review on n = 319 patients who had undergone clinical whole exome sequencing (WES) for further etiological evaluation of neurodevelopmental diagnoses that remained unexplained despite extensive prior workup...
January 2018: Neurogenetics
https://www.readbyqxmd.com/read/29260337/the-contribution-of-7q33-copy-number-variations-for-intellectual-disability
#13
Fátima Lopes, Fátima Torres, Sally Ann Lynch, Arminda Jorge, Susana Sousa, João Silva, Paula Rendeiro, Purificação Tavares, Ana Maria Fortuna, Patrícia Maciel
Copy number variations (CNVs) at the 7q33 cytoband are very rarely described in the literature, and almost all of the cases comprise large deletions affecting more than just the q33 segment. We report seven patients (two families with two siblings and their affected mother and one unrelated patient) with neurodevelopmental delay associated with CNVs in 7q33 alone. All the patients presented mild to moderate intellectual disability (ID), dysmorphic features, and a behavioral phenotype characterized by aggressiveness and disinhibition...
January 2018: Neurogenetics
https://www.readbyqxmd.com/read/29247375/a-novel-mutation-in-lamc3-associated-with-generalized-polymicrogyria-of-the-cortex-and-epilepsy
#14
J L Zambonin, D A Dyment, Y Xi, R E Lamont, T Hartley, E Miller, M Kerr, K M Boycott, J S Parboosingh, S Venkateswaran
Occipital cortical malformation is a rare neurodevelopmental disorder characterized by pachygyria and polymicrogyria of the occipital lobes as well as global developmental delays and seizures. This condition is due to biallelic, loss-of-function mutations in LAMC3 and has been reported in four unrelated families to date. We report an individual with global delays, seizures, and polymicrogyria that extends beyond the occipital lobes and includes the frontal, parietal, temporal, and occipital lobes. Next-generation sequencing identified a homozygous nonsense mutation in LAMC3: c...
January 2018: Neurogenetics
https://www.readbyqxmd.com/read/29209898/clinical-application-of-next-generation-sequencing-in-hereditary-spinocerebellar-ataxia-increasing-the-diagnostic-yield-and-broadening-the-ataxia-spasticity-spectrum-a-retrospective-analysis
#15
REVIEW
Daniele Galatolo, Alessandra Tessa, Alessandro Filla, Filippo M Santorelli
One of the hardest challenges in medical genetics is to reach a molecular diagnosis in the presence of rare brain disorders. Hereditary spinocerebellar ataxia (HA), characterized by high clinical and genetic heterogeneity, is among the diseases that present this challenge. HA can have features overlapping with those of other neurological diseases, especially hereditary spastic paraplegia (HSP), as routine clinical application of next generation sequencing (NGS) has confirmed. This article reviews different NGS methods applied in heterogeneous cohorts of patients with suspected HA and suggests that exome sequencing should be considered the first-tier genetic approach in this setting...
January 2018: Neurogenetics
https://www.readbyqxmd.com/read/29197946/first-large-genomic-inversion-in-familial-cerebral-cavernous-malformation-identified-by-whole-genome-sequencing
#16
Stefanie Spiegler, Matthias Rath, Sabine Hoffjan, Philipp Dammann, Ulrich Sure, Axel Pagenstecher, Tim Strom, Ute Felbor
Familial cerebral cavernous malformations (CCMs) predispose to seizures and hemorrhagic stroke. Molecular genetic analyses of CCM1, CCM2, and CCM3 result in a mutation detection rate of up to 98%. However, only whole genome sequencing (WGS) in combination with the Manta algorithm for analyses of structural variants revealed a heterozygous 24 kB inversion including exon 1 of CCM2 in a 12-year-old boy with familial CCMs. Its breakpoints were fine-mapped, and quantitative analysis on RNA confirmed reduced CCM2 expression...
January 2018: Neurogenetics
https://www.readbyqxmd.com/read/29151244/identification-of-rare-noncoding-sequence-variants-in-gamma-aminobutyric-acid-a-receptor-alpha-4-subunit-in-autism-spectrum-disorder
#17
Anthony J Griswold, Derek Van Booven, Michael L Cuccaro, Jonathan L Haines, John R Gilbert, Margaret A Pericak-Vance
Alterations of the gamma-aminobutyric acid (GABA) signaling system has been strongly linked to the pathophysiology of autism spectrum disorder (ASD). Genetic associations of common variants in GABA receptor subunits, in particular GABRA4 on chromosome 4p12, with ASD have been replicated by several studies. Moreover, molecular investigations have identified altered transcriptional and translational levels of this gene and protein in brains of ASD individuals. Since the genotyped common variants are likely not the functional variants contributing to the molecular consequences or underlying ASD phenotype, this study aims to examine rare sequence variants in GABRA4, including those outside the protein coding regions of the gene...
January 2018: Neurogenetics
https://www.readbyqxmd.com/read/29130122/arhgef9-mutations-in-epileptic-encephalopathy-intellectual-disability-toward-understanding-the-mechanism-underlying-phenotypic-variation
#18
Jing-Yang Wang, Peng Zhou, Jie Wang, Bin Tang, Tao Su, Xiao-Rong Liu, Bing-Mei Li, Heng Meng, Yi-Wu Shi, Yong-Hong Yi, Na He, Wei-Ping Liao
ARHGEF9 resides on Xq11.1 and encodes collybistin, which is crucial in gephyrin clustering and GABAA receptor localization. ARHGEF9 mutations have been identified in patients with heterogeneous phenotypes, including epilepsy of variable severity and intellectual disability. However, the mechanism underlying phenotype variation is unknown. Using next-generation sequencing, we identified a novel mutation, c.868C > T/p.R290C, which co-segregated with epileptic encephalopathy, and validated its association with epileptic encephalopathy...
January 2018: Neurogenetics
https://www.readbyqxmd.com/read/29164503/developing-the-field-of-neurogenetics
#19
EDITORIAL
Ulrich Müller, Georg Auburger, Manuel B Graeber, Louis J Ptacek
No abstract text is available yet for this article.
December 2017: Neurogenetics
https://www.readbyqxmd.com/read/29086072/gne-missense-mutation-in-recessive-familial-amyotrophic-lateral-sclerosis
#20
Çiğdem Köroğlu, Rezzak Yılmaz, Mine Hayriye Sorgun, Seyhun Solakoğlu, Özden Şener
Amyotrophic lateral sclerosis (ALS) is a motor neuron disease eventually leading to death from respiratory failure. Recessive inheritance is very rare. Here, we describe the clinical findings in a consanguineous family with five men afflicted with recessive ALS and the identification of the homozygous mutation responsible for the disorder. The onset of the disease ranged from 12 to 35 years of age, with variable disease progressions. We performed clinical investigations including metabolic and paraneoplastic screening, cranial and cervical imaging, and electrophysiology...
December 2017: Neurogenetics
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