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https://www.readbyqxmd.com/read/28742507/severe-neurological-abnormalities-in-a-young-boy-with-impaired-thyroid-hormone-sensitivity-due-to-a-novel-mutation-in-the-mct8-gene
#1
Teresa Rego, Carmen Gomez Lado, Paloma Cabanas Rodríguez, Francisco Sousa Santos, Francisco Barros Angueira, Lidia Castro-Feijóo, Jesús Barreiro Conde, Manuel Castro-Gago
Monocarboxylate transporter 8 (MCT8) is an active and specific thyroid hormone transporter into neurons. MCT8 mutations cause an X-linked condition known as Allan-Herndon-Dudley syndrome and are characterized by impaired psychomotor development and typical abnormal thyroid function. We describe a 10-year-old boy with severe cognitive disability, axial hypotonia, spastic quadriplegia and sporadic dyskinetic episodes. He initially presented with thyroid dysfunction (high FT3, low rT3, low FT4 and normal TSH) and generalized retardation of the cerebral and cerebellar myelination in brain magnetic resonance imaging...
April 2017: Hormones: International Journal of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28742244/novel-prps1-gain-of-function-mutation-in-a-patient-with-congenital-hyperuricemia-and-facial-anomalies
#2
Joseph Porrmann, Elitza Betcheva-Krajcir, Nataliya Di Donato, Anne-Karin Kahlert, Jens Schallner, Andreas Rump, Evelin Schröck, Doreen Dobritzsch, Jeroen Roelofsen, André B P van Kuilenburg, Andreas Tzschach
Phosphoribosylpyrophosphate synthetase (PRPPS) superactivity (OMIM 300661) is a rare inborn error of purine metabolism that is caused by gain-of-function mutations in the X-chromosomal gene PRPS1 (Xq22.3). Clinical characteristics include congenital hyperuricemia and hyperuricosuria, gouty arthritis, urolithiasis, developmental delay, hypotonia, recurrent infections, short stature, and hearing loss. Only eight families with PRPPS superactivity and PRPS1 gain-of-function mutations have been reported to date...
July 25, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/28742085/clinically-severe-cacna1a-alleles-affect-synaptic-function-and-neurodegeneration-differentially
#3
Xi Luo, Jill A Rosenfeld, Shinya Yamamoto, Tamar Harel, Zhongyuan Zuo, Melissa Hall, Klaas Wierenga, Matthew T Pastore, Dennis Bartholomew, Mauricio R Delgado, Joshua Rotenberg, Richard Alan Lewis, Lisa Emrick, Carlos A Bacino, Mohammad K Eldomery, Zeynep Coban Akdemir, Fan Xia, Yaping Yang, Seema R Lalani, Timothy Lotze, James R Lupski, Brendan Lee, Hugo J Bellen, Michael F Wangler
Dominant mutations in CACNA1A, encoding the α-1A subunit of the neuronal P/Q type voltage-dependent Ca2+ channel, can cause diverse neurological phenotypes. Rare cases of markedly severe early onset developmental delay and congenital ataxia can be due to de novo CACNA1A missense alleles, with variants affecting the S4 transmembrane segments of the channel, some of which are reported to be loss-of-function. Exome sequencing in five individuals with severe early onset ataxia identified one novel variant (p.R1673P), in a girl with global developmental delay and progressive cerebellar atrophy, and a recurrent, de novo p...
July 24, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28737878/-unusual-case-of-food-protein-induced-enterocolitis-syndrome
#4
M Teresa Sobrevia Elfau, Yolanda Aliaga Mazas, Gonzalo Herraiz Gastesi, Paula M Barberá Pérez, Ángela M Ascaso Matamala
Food protein-induced enterocolitis syndrome is a nonimmunoglobulin E mediated gastrointestinal food hypersensitivity that manifests as profuse, repetitive vomiting, pallor and hypotonia, often with diarrhea leading to severe dehydration and lethargy (sepsis-like symptoms) in the acute setting. An oral food challenge is sometimes performed to confirm the diagnosis and treatment consists of elimination of the food trigger(s) from the diet. We report a case of a 3-monthsold infant with several episodes of food protein-induced enterocolitis syndrome after taking infant formula milk with tolerance of another trademark...
August 1, 2017: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/28737873/two-novel-mutations-in-the-glycine-decarboxylase-gene-in-a-boy-with-classic-nonketotic-hyperglycinemia-case-report
#5
Shu Liu, Zhiqing Wang, Jinqun Liang, Nuan Chen, Haimei OuYang, Weihong Zeng, Liying Chen, Xunjie Xie, Jianhui Jiang
Nonketotic hyperglycinemia is an extremely rare autosomal recessively inherited glycine encephalopathy caused by a deficiency in the mitochondrial glycine cleavage system, which leads to severe clinical symptoms. Nonketotic hyperglycinemia is characterized by complex and diverse phenotypes, such as hypotonia, seizures, cognitive impairment, developmental delays and myoclonic jerks that may lead to apnea and even death. Here we report a 1-year-old boy with myoclonic seizures, hypotonia and coma; he had elevated plasma and cerebrospinal fluid glycine levels, and cerebrospinal fluid/plasma glycine ratio was 0...
August 1, 2017: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/28733338/early-and-lethal-neurodegeneration-with-myasthenic-and-myopathic-features-a-new-alg14-cdg
#6
David C Schorling, Simone Rost, Dirk J Lefeber, Lauren Brady, Clemens R Müller, Rudolf Korinthenberg, Mark Tarnopolsky, Carsten G Bönnemann, Richard J Rodenburg, Marianna Bugiani, Maria Beytia, Marcus Krüger, Marjo van der Knaap, Jan Kirschner
OBJECTIVE: To describe the presentation and identify the cause of a new clinical phenotype, characterized by early severe neurodegeneration with myopathic and myasthenic features. METHODS: This case study of 5 patients from 3 families includes clinical phenotype, serial MRI, electrophysiologic testing, muscle biopsy, and full autopsy. Genetic workup included whole exome sequencing and segregation analysis of the likely causal mutation. RESULTS: All 5 patients showed severe muscular hypotonia, progressive cerebral atrophy, and therapy-refractory epilepsy...
July 21, 2017: Neurology
https://www.readbyqxmd.com/read/28732259/dravet-syndrome-characteristics-comorbidities-and-caregiver-concerns
#7
Nicole Villas, Mary Anne Meskis, Sue Goodliffe
The Dravet Syndrome Foundation (DSF) conducted the largest in-depth survey of parents and caregivers of patients with Dravet syndrome (DS) to date, in order to (1) identify top concerns among caregivers, (2) establish an approximate frequency of characteristics and comorbidities of DS beyond seizures, and (3) provide direction for clinicians and researchers looking to study the effects of DS on the patient and family unit. Two hundred fifty-six responses were received representing a patient age range of 9months to 32years with a median age group of 7-10years (IQR=8)...
July 18, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28726805/prepl-deficiency-delineation-of-the-phenotype-and-development-of-a-functional-blood-assay
#8
Luc Régal, Emma Mårtensson, Isabelle Maystadt, Nicol Voermans, Damien Lederer, Alberto Burlina, María Jesús Juan Fita, A Jeannette M Hoogeboom, Mia Olsson Engman, Tess Hollemans, Meyke Schouten, Sandra Meulemans, Tord Jonson, Inge François, David Gil Ortega, Erik-Jan Kamsteeg, John W M Creemers
PurposePREPL deficiency causes neonatal hypotonia, ptosis, neonatal feeding difficulties, childhood obesity, xerostomia, and growth hormone deficiency. Different recessive contiguous gene deletion syndromes involving PREPL and a variable combination of SLC3A1 (hypotonia-cystinuria syndrome), CAMKMT (atypical hypotonia-cystinuria syndrome), and PPM1B (2p21 deletion syndrome) have been described. In isolated PREPL deficiency, previously described only once, the absence of cystinuria complicates the diagnosis...
July 20, 2017: Genetics in Medicine: Official Journal of the American College of Medical Genetics
https://www.readbyqxmd.com/read/28719906/a-common-ancestral-asn242ser-mutation-in-tmem67-identified-in-multiple-iranian-families-with-joubert-syndrome
#9
MohammadReza Dehghani, Majid Mojarad, Ehsan Ghayoor Karimiani, Mohammad Yahya Vahidi Mehrjardi, Afsaneh Sahebalzamani, Farah Ashrafzadeh, Mehran Beiraghi Toosi, Atiyeh Eslahi, Najmeh Ahangari, Seyed Mojtaba Yassini, Afsaneh Hassanbeigi, Azam Rasti, Seyed Mehdi Kalantar, Reza Maroofian
BACKGROUND: Joubert syndrome (JS) is a clinically and genetically heterogeneous group of rare neurodevelopmental disorder characterised by peculiar midbrain-hindbrain malformation, known as the "molar tooth" sign. JS can manifest a broad range of signs and symptoms. The most common features of JS are hypotonia, ataxia, developmental delay/intellectual disability, abnormal eye movements, and neonatal breathing abnormalities. To date, 29 genes have been shown to cause JS. METHODS: We employed whole-genome single nucleotide polymorphism genotyping in a group of Iranian families with JS and Sanger sequencing of a known mutation associated with JS located in a single homozygous regions shared by affected members of the families...
July 19, 2017: Public Health Genomics
https://www.readbyqxmd.com/read/28705765/terminal-14q32-33-deletion-as-a-novel-cause-of-agammaglobulinemia
#10
Christoph B Geier, Alexander Piller, Martha M Eibl, Peter Ciznar, Denisa Ilencikova, Hermann M Wolf
Over the past decades, a pleiotropic spectrum of B-cell intrinsic defects leading to early onset agammaglobulinemia and absent B cells has been described. Herein we report terminal 14q32.33 deletion as a novel cause of agammaglobulinemia. We describe a 20-year old man with a 1MB terminal 14q32.33 deletion resulting in a loss of the entire Immunoglobulin heavy chain gene region of chromosome 14. The patient presented with absent serum immunoglobulin levels and absent circulating B cells since age 2. The clinical picture was dominated by severe episodes of recurrent upper respiratory tract infections...
July 10, 2017: Clinical Immunology: the Official Journal of the Clinical Immunology Society
https://www.readbyqxmd.com/read/28694852/does-the-genetic-cause-of-prader-willi-syndrome-explain-the-highly-variable-phenotype
#11
Andreea-Iulia Dobrescu, Adela Chirita-Emandi, Nicoleta Andreescu, Simona Farcas, Maria Puiu
INTRODUCTION: Prader-Willi syndrome (PWS) is characterized by extensive clinical and genetic variability caused by lack of expression of imprinted genes of the chromosomal region 15q11.2-q13. The genotye-phenotype correlation has not been yet fully elucidated. AIM: To analyze these correlations in order to determine the role of specifi c geneic alterations in the development of clinical symptoms in PWS. MATERIAL AND METHOD: We retrospectively analyzed data routinely collected as part of the clinical care of 52 patients with clinical suspicion of PWS...
September 2016: Mædica
https://www.readbyqxmd.com/read/28692456/focal-necrotizing-myopathy-with-dropped-head-syndrome-induced-by-cobimetinib-in-metastatic-melanoma
#12
Marie-Léa Gauci, Pauline Laly, Leonard-Louis Sarah, Anthony Behin, Jérémy Gottlieb, Isabelle Madelaine-Chambrin, Barouyr Baroudjian, Laetitia Da-Meda, Samia Mourah, Maxime Battistella, Nicole Basset Seguin, Martine Bagot, Cécile Pages, Laetitia Vercellino, Thierry Maisonobe, Céleste Lebbé
Therapeutic advances derived from targeted therapy and immune checkpoint inhibitors can improve melanoma prognosis. Since 2015, cobimetinib has been approved in combination with vemurafenib in the first-line treatment for BRAF-mutated melanoma. For NRAS-mutated melanomas, MEK inhibition seems to be a therapeutic target, and association with checkpoint inhibitor provides a further therapeutic perspective. Infraclinical creatine phosphokinase (CPK) elevation is an MEK inhibitor side effect. We describe a case of focal necrotizing myopathy with 'dropped-head syndrome' induced by cobimetinib, 1 month after its introduction...
July 7, 2017: Melanoma Research
https://www.readbyqxmd.com/read/28690993/2q37-deletion-syndrome-confirmed-by-high-resolution-cytogenetic-analysis
#13
Eun-Kyung Cho, Jinsup Kim, Aram Yang, Sung Yoon Cho, Dong-Kyu Jin
Chromosome 2q37 deletion syndrome is a rare chromosomal disorder characterized by mild to moderate developmental delay, brachydactyly of the third to fifth digits or toes, short stature, obesity, hypotonia, a characteristic facial appearance, and autism spectrum disorder. Here, we report on a patient with 2q37 deletion presenting with dilated cardiomyopathy (DCMP). Congenital heart malformations have been noted in up to 20% of patients with 2q37 deletions. However, DCMP has not been reported in 2q37 deletion patients previously...
June 2017: Annals of Pediatric Endocrinology & Metabolism
https://www.readbyqxmd.com/read/28688840/impact-of-clinical-exomes-in-neurodevelopmental-and-neurometabolic-disorders
#14
Christina Evers, Christian Staufner, Martin Granzow, Nagarajan Paramasivam, Katrin Hinderhofer, Lilian Kaufmann, Christine Fischer, Christian Thiel, Thomas Opladen, Urania Kotzaeridou, Stefan Wiemann, Matthias Schlesner, Roland Eils, Stefan Kölker, Claus R Bartram, Georg F Hoffmann, Ute Moog
Whole exome sequencing (WES) is well established in research and is now being introduced into clinically indicated diagnostics (so-called clinical exomes). We evaluated the diagnostic yield and clinical implications of WES in 72 patients from 60 families with undiagnosed neurodevelopmental disorders (NDD), neurometabolic disorders, and dystonias. Pathogenic or likely pathogenic variants leading to a molecular diagnosis could be identified in 21 of the 60 families (overall 35%, in 36% of patients with NDD, in 43% of patients with neurometabolic disorders, in 25% of patients with dystonias)...
June 30, 2017: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/28687876/chromosome-21-encoded-micrornas-mrnas-impact-on-down-s-syndrome-and-trisomy-21-linked-disease
#15
P N Alexandrov, M E Percy, Walter J Lukiw
Down's syndrome (DS; also known as trisomy 21; T21) is caused by a triplication of all or part of human chromosome 21 (chr21). DS is the most common genetic cause of intellectual disability attributable to a naturally-occurring imbalance in gene dosage. DS incurs huge medical, healthcare, and socioeconomic costs, and there are as yet no effective treatments for this incapacitating human neurogenetic disorder. There is a remarkably wide variability in the 'phenotypic spectrum' associated with DS; the progression of symptoms and the age of DS onset fluctuate, and there is further variability in the biophysical nature of the chr21 duplication...
July 7, 2017: Cellular and Molecular Neurobiology
https://www.readbyqxmd.com/read/28687524/pierpont-syndrome-associated-with-the-p-tyr446cys-missense-mutation-in-tbl1xr1
#16
Anne Slavotinek, Heather Pua, Ugur Hodoglugil, Jude Abadie, Joseph Shieh, Jessica Van Ziffle, Mark Kvale, Hane Lee, Pui-Yan Kwok, Neil Risch, Marta Sabbadini
We present a 7-year old male with severe delays, hypotonia and dysmorphic features who had striking, deep palmar and plantar creases and pillowing of the soft tissues of the palms and soles. His facial features included a high anterior hairline, small eyes with narrowed palpebral fissures, a bulbous nasal tip with a short columella, and a large mouth with a thin upper vermilion, and small chin. He had a submucous cleft palate, bilateral cryptorchidism and hydronephrosis. Cranial imaging demonstrated an Arnold Chiari malformation that was also present in his maternal uncle by report...
July 4, 2017: European Journal of Medical Genetics
https://www.readbyqxmd.com/read/28687512/recessive-mutation-in-exosc3-associates-with-mitochondrial-dysfunction-and-pontocerebellar-hypoplasia
#17
Gudrun Schottmann, Sylvie Picker-Minh, Jana Marie Schwarz, Esther Gill, Richard J T Rodenburg, Werner Stenzel, Angela M Kaindl, Markus Schuelke
Recessive mutations in EXOSC3, encoding a subunit of the human RNA exosome complex, cause pontocerebellar hypoplasia type 1b (PCH1B). We report a boy with severe muscular hypotonia, psychomotor retardation, progressive microcephaly, and cerebellar atrophy. Biochemical abnormalities comprised mitochondrial complex I and pyruvate dehydrogenase complex (PDHc) deficiency. Whole exome sequencing uncovered a known EXOSC3 mutation p.(D132A) as the underlying cause. In patient fibroblasts, a large portion of the EXOSC3 protein was trapped in the cytosol...
July 4, 2017: Mitochondrion
https://www.readbyqxmd.com/read/28674683/infusion-of-sibling-marrow-in-a-patient-with-purine-nucleoside-phosphorylase-deficiency-leads-to-split-mixed-donor-chimerism-and-normal-immunity
#18
Laura Yeates, Mary A Slatter, Andrew R Gennery
Purine nucleoside phosphorylase (PNP) deficiency, a rare autosomal recessive metabolic disease causes combined immunodeficiency and developmental delay, hypotonia, and spasticity. Patients present with recurrent infections associated with T-lymphocytopenia, characteristically presenting later than patients with classical severe combined immunodeficiency (SCID). PNP, with adenosine deaminase (ADA), is part of the purine salvage pathway. The only curative therapy is hematopoietic stem cell transplantation. Myeloablative conditioning is recommended to prevent rejection caused by residual immune function...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/28669993/the-5-phosphatase-ocrl-in-lowe-syndrome-and-dent-disease-2
#19
REVIEW
Maria Antonietta De Matteis, Leopoldo Staiano, Francesco Emma, Olivier Devuyst
Lowe syndrome is an X-linked disease that is characterized by congenital cataracts, central hypotonia, intellectual disability and renal Fanconi syndrome. The disease is caused by mutations in OCRL, which encodes an inositol polyphosphate 5-phosphatase (OCRL) that acts on phosphoinositides - quantitatively minor constituents of cell membranes that are nonetheless pivotal regulators of intracellular trafficking. In this Review we summarize the considerable progress made over the past decade in understanding the cellular roles of OCRL in regulating phosphoinositide balance along the endolysosomal pathway, a fundamental system for the reabsorption of proteins and solutes by proximal tubular cells...
August 2017: Nature Reviews. Nephrology
https://www.readbyqxmd.com/read/28668235/severe-hypotonia-and-postnatal-growth-impairment-in-a-girl-with-a-missense-mutation-in-col1a1-implication-of-expanded-phenotypic-spectrum-of-type-i-collagenopathy
#20
Jin Sook Lee, Jieun Seo, Anna Cho, Byung Chan Lim, Murim Choi, Jung-Wook Kim, Ok-Hwa Kim, Tae-Joon Cho, Jong-Hee Chae
BACKGROUND: It is known that type I collagenopathy has a broad-spectrum phenotypic variability. Here, we report a case of a Korean girl with a heterozygous COL1A1 mutation who had an atypical presentation. CASE PRESENTATION: A 26-month-old girl presented with delayed motor development and failure to thrive. She had severe growth retardation. She exhibited right-sided plagiocephaly, blue sclerae, and facial dysmorphism, including a small pointed chin, frontal bossing, and a triangular face, but had microcephaly...
June 28, 2017: Brain & Development
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