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Developmental delay AND whole exome sequencing

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https://www.readbyqxmd.com/read/29736960/kif16b-is-a-candidate-gene-for-a-novel-autosomal-recessive-intellectual-disability-syndrome
#1
Saud Alsahli, Stefan T Arold, Ahmed Alfares, Bader Alhaddad, Mohammed Al Balwi, Erik-Jan Kamsteeg, Waleed Al-Twaijri, Majid Alfadhel
Intellectual disability (ID) and global developmental delay are closely related; the latter is reserved for children under the age of 5 years as it is challenging to reliably assess clinical severity in this population. ID is a common condition, with up to 1%-3% of the population being affected and leading to a huge social and economic impact. ID is attributed to genetic abnormalities most of the time; however, the exact role of genetic involvement in ID is yet to be determined. Whole exome sequencing (WES) has gained popularity in the workup for ID, and multiple studies have been published examining the diagnostic yield in identification of the disease-causing variant (16%-55%), with the genetic involvement increasing as intelligence quotient decreases...
May 7, 2018: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/29706646/comprehensive-genomic-analysis-of-patients-with-disorders-of-cerebral-cortical-development
#2
Wojciech Wiszniewski, Pawel Gawlinski, Tomasz Gambin, Monika Bekiesinska-Figatowska, Ewa Obersztyn, Dorota Antczak-Marach, Zeynep Hande Coban Akdemir, Tamar Harel, Ender Karaca, Marta Jurek, Katarzyna Sobecka, Beata Nowakowska, Malgorzata Kruk, Iwona Terczynska, Alicja Goszczanska-Ciuchta, Mariola Rudzka-Dybala, Ewa Jamroz, Antoni Pyrkosz, Anna Jakubiuk-Tomaszuk, Piotr Iwanowski, Dorota Gieruszczak-Bialek, Malgorzata Piotrowicz, Maria Sasiadek, Iwona Kochanowska, Barbara Gurda, Barbara Steinborn, Mateusz Dawidziuk, Jennifer Castaneda, Pawel Wlasienko, Natalia Bezniakow, Shalini N Jhangiani, Dorota Hoffman-Zacharska, Jerzy Bal, Elzbieta Szczepanik, Eric Boerwinkle, Richard A Gibbs, James R Lupski
Malformations of cortical development (MCDs) manifest with structural brain anomalies that lead to neurologic sequelae, including epilepsy, cerebral palsy, developmental delay, and intellectual disability. To investigate the underlying genetic architecture of patients with disorders of cerebral cortical development, a cohort of 54 patients demonstrating neuroradiologic signs of MCDs was investigated. Individual genomes were interrogated for single-nucleotide variants (SNV) and copy number variants (CNV) with whole-exome sequencing and chromosomal microarray studies...
April 30, 2018: European Journal of Human Genetics: EJHG
https://www.readbyqxmd.com/read/29691939/genome-sequencing-reveals-a-novel-genetic-mechanism-underlying-dihydropyrimidine-dehydrogenase-deficiency-a-novel-missense-variant-c-1700g-a-and-a-large-intragenic-inversion-in-dpyd-spanning-intron-8-to-intron-12
#3
André B P van Kuilenburg, Maja Tarailo-Graovac, Judith Meijer, Britt Drogemoller, Jerry Vockley, Dirk Maurer, Doreen Dobritzsch, Colin J Ross, Wyeth Wasserman, Rutger Meinsma, Lida Zoetekouw, Clara D M van Karnebeek
Dihydropyrimidine dehydrogenase (DPD) deficiency is associated with a variable clinical presentation. A family with three DPD deficient patients presented with unusual clinical phenotypes including pregnancy-induced symptoms, transient visual impairment, severe developmental delay, cortical blindness and delayed myelination in the brain. DPYD Sanger sequencing showed heterozygosity for the c.1905+1G > A mutation and a novel missense variant c.1700G > A (p.G456E). The recombinantly-expressed p.G456E DPD variant showed increased temperature lability probably caused by structural rearrangements within the DPD protein...
April 24, 2018: Human Mutation
https://www.readbyqxmd.com/read/29681094/a-neurodegenerative-mitochondrial-disease-phenotype-due-to-biallelic-loss-of-function-variants-in-pnpla8-encoding-calcium-independent-phospholipase-a2%C3%AE
#4
Anju Shukla, Russell P Saneto, Malavika Hebbar, Ghayda Mirzaa, Katta M Girisha
Animal studies have demonstrated the critical roles of the patatin-like protein family plays in cellular growth, lipid homeostasis, and second messenger signaling the nervous system. Of the nine known calcium-independent phospholipase A2γ, only PNPLA2, PNLPA6, PNPLA9 and most recently a single patient with PNPLA8 are associated with mitochondrial-related neurodegeneration. Using whole exome sequencing, we report two unrelated individuals with variable but similar clinical features of microcephaly, severe global developmental delay, spasticity, lactic acidosis, and progressive cerebellar atrophy with biallelic loss-of-function variants in PNPLA8...
May 2018: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/29681093/low-level-expression-of-epg5-leads-to-an-attenuated-vici-syndrome-phenotype
#5
Megan A Waldrop, Felecia Gumienny, Daniel Boue, Emily de Los Reyes, Richard Shell, Robert B Weiss, Kevin M Flanigan
Vici syndrome is a multisystem disorder characterized by agenesis of the corpus callosum, oculocutaneous hypopigmentation, cataracts, cardiomyopathy, combined immunodeficiency, failure to thrive, profound developmental delay, and acquired microcephaly. Most individuals are severely affected and have a markedly reduced life span. Here we describe an 8-year-old boy with a history of developmental delay, agenesis of the corpus callosum, failure to thrive, myopathy, and well-controlled epilepsy. He was initially diagnosed with a mitochondrial disorder, based in part upon nonspecific muscle biopsy findings, but mitochondrial DNA mutation analysis revealed no mutations...
May 2018: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/29668857/de-novo-mutations-of-the-atp6v1a-gene-cause-developmental-encephalopathy-with-epilepsy
#6
Anna Fassio, Alessandro Esposito, Mitsuhiro Kato, Hirotomo Saitsu, Davide Mei, Carla Marini, Valerio Conti, Mitsuko Nakashima, Nobuhiko Okamoto, Akgun Olmez Turker, Burcu Albuz, C Nur Semerci Gündüz, Keiko Yanagihara, Elisa Belmonte, Luca Maragliano, Keri Ramsey, Chris Balak, Ashley Siniard, Vinodh Narayanan, Chihiro Ohba, Masaaki Shiina, Kazuhiro Ogata, Naomichi Matsumoto, Fabio Benfenati, Renzo Guerrini
V-type proton (H+) ATPase (v-ATPase) is a multi-subunit proton pump that regulates pH homeostasis in all eukaryotic cells; in neurons, v-ATPase plays additional and unique roles in synapse function. Through whole exome sequencing, we identified de novo heterozygous mutations (p.Pro27Arg, p.Asp100Tyr, p.Asp349Asn, p.Asp371Gly) in ATP6V1A, encoding the A subunit of v-ATPase, in four patients with developmental encephalopathy with epilepsy. Early manifestations, observed in all patients, were developmental delay and febrile seizures, evolving to encephalopathy with profound delay, hypotonic/dyskinetic quadriparesis and intractable multiple seizure types in two patients (p...
April 13, 2018: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29664460/a-novel-variant-in-atm-gene-causes-ataxia-telangiectasia-revealed-by-whole-exome-sequencing
#7
Noufa A Alonazi, Khalid J Hundallah, Amal M Al Hashem, Sarar Mohamed
Ataxia-Telangiectasia (A-T) is an autosomal recessive disorder caused by variants in ATM gene and characterized by progressive neurologic impairment, cerebellar ataxia, and oculo-cutaneous telangiectasia. Immunodeficiency with a recurrent sinopulmonary infections are observed in patients with A-T. Here, we report a novel stop codon variant, c.5944 C>T (p.Gln1982*), revealed by whole-exome sequencing in a 9-year old boy. He presented with recurrent upper respiratory tract infections, failure to thrive, developmental delay, ataxic gait, and bulbar telangiectasia...
April 2018: Neurosciences: the Official Journal of the Pan Arab Union of Neurological Sciences
https://www.readbyqxmd.com/read/29663647/novel-de-novo-pathogenic-variant-in-the-nr2f2-gene-in-a-boy-with-congenital-heart-defect-and-dysmorphic-features
#8
Jariya Upadia, Patrick R Gonzales, Nathaniel H Robin
The NR2F2 gene plays an important role in angiogenesis and heart development. Moreover, this gene is involved in organogenesis in many other organs in mouse models. Variants in this gene have been reported in a number of patients with nonsyndromic atrioventricular septal defect, and in one patient with congenital heart defect and dysmorphic features. Here we report an 11-month-old Caucasian male with global developmental delay, dysmorphic features, coarctation of the aorta, and ventricular septal defect. He was later found to have a pathogenic mutation in the NR2F2 gene by whole exome sequencing...
April 16, 2018: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/29656858/a-recurrent-de-novo-pacs2-heterozygous-missense-variant-causes-neonatal-onset-developmental-epileptic-encephalopathy-facial-dysmorphism-and-cerebellar-dysgenesis
#9
Heather E Olson, Nolwenn Jean-Marçais, Edward Yang, Delphine Heron, Katrina Tatton-Brown, Paul A van der Zwaag, Emilia K Bijlsma, Bryan L Krock, E Backer, Erik-Jan Kamsteeg, Margje Sinnema, Margot R F Reijnders, David Bearden, Amber Begtrup, Aida Telegrafi, Roelineke J Lunsing, Lydie Burglen, Gaetan Lesca, Megan T Cho, Lacey A Smith, Beth R Sheidley, Christelle Moufawad El Achkar, Phillip L Pearl, Annapurna Poduri, Cara M Skraban, Jennifer Tarpinian, Addie I Nesbitt, Dietje E Fransen van de Putte, Claudia A L Ruivenkamp, Patrick Rump, Nicolas Chatron, Isabelle Sabatier, Julitta De Bellescize, Laurent Guibaud, David A Sweetser, Jessica L Waxler, Klaas J Wierenga, Jean Donadieu, Vinodh Narayanan, Keri M Ramsey, Caroline Nava, Jean-Baptiste Rivière, Antonio Vitobello, Frédéric Tran Mau-Them, Christophe Philippe, Ange-Line Bruel, Yannis Duffourd, Laurel Thomas, Stefan H Lelieveld, Janneke Schuurs-Hoeijmakers, Han G Brunner, Boris Keren, Julien Thevenon, Laurence Faivre, Gary Thomas, Christel Thauvin-Robinet
Developmental and epileptic encephalopathies (DEEs) represent a large clinical and genetic heterogeneous group of neurodevelopmental diseases. The identification of pathogenic genetic variants in DEEs remains crucial for deciphering this complex group and for accurately caring for affected individuals (clinical diagnosis, genetic counseling, impacting medical, precision therapy, clinical trials, etc.). Whole-exome sequencing and intensive data sharing identified a recurrent de novo PACS2 heterozygous missense variant in 14 unrelated individuals...
May 3, 2018: American Journal of Human Genetics
https://www.readbyqxmd.com/read/29655802/mars-variant-associated-with-both-recessive-interstitial-lung-and-liver-disease-and-dominant-charcot-marie-tooth-disease
#10
Jonathan Rips, Rebecca Meyer-Schuman, Oded Breuer, Reuven Tsabari, Avraham Shaag, Shoshana Revel-Vilk, Shimon Reif, Orly Elpeleg, Anthony Antonellis, Tamar Harel
Aminoacyl-tRNA synthetases (ARSs) are ubiquitously expressed enzymes responsible for charging tRNA with cognate amino acids during protein translation. Non-canonical functions are increasingly recognized, and include transcription and translation control and extracellular signaling. Monoallelic mutations in genes encoding several ARSs have been identified in axonal Charcot-Marie-Tooth (CMT2) disease, whereas biallelic mutations in ARS loci have been associated with multi-tissue syndromes, variably involving the central nervous system, lung, and liver...
April 12, 2018: European Journal of Medical Genetics
https://www.readbyqxmd.com/read/29588991/early-onset-epileptic-encephalopathy-and-severe-developmental-delay-in-an-association-with-de-novo-double-mutations-in-nf1-and-magel2
#11
Satoshi Akamine, Noriaki Sagata, Yasunari Sakai, Takahiro A Kato, Takeshi Nakahara, Yuki Matsushita, Osamu Togao, Akio Hiwatashi, Masafumi Sanefuji, Yoshito Ishizaki, Hiroyuki Torisu, Hirotomo Saitsu, Naomichi Matsumoto, Toshiro Hara, Akira Sawa, Shinichi Kano, Masutaka Furue, Shigenobu Kanba, Chad A Shaw, Shouichi Ohga
Advance in the exome-wide sequencing analysis contributes to identifying hundreds of genes that are associated with early-onset epileptic encephalopathy and neurodevelopmental disorders. On the basis of massive sequencing data, functional interactions among different genes are suggested to explain the common molecular pathway underlying the pathogenic process of these disorders. However, the relevance of such interactions with the phenotypic severity or variety in an affected individual remains elusive. In this report, we present a 45-year-old woman with neurofibromatosis type 1 (NF1), infantile-onset epileptic encephalopathy, and severe developmental delay...
March 2018: Epilepsia Open
https://www.readbyqxmd.com/read/29574422/maternal-variants-in-nlrp-and-other-maternal-effect-proteins-are-associated-with-multilocus-imprinting-disturbance-in-offspring
#12
Matthias Begemann, Faisal I Rezwan, Jasmin Beygo, Louise E Docherty, Julia Kolarova, Christopher Schroeder, Karin Buiting, Kamal Chokkalingam, Franziska Degenhardt, Emma L Wakeling, Stephanie Kleinle, Daniela González Fassrainer, Barbara Oehl-Jaschkowitz, Claire L S Turner, Michal Patalan, Maria Gizewska, Gerhard Binder, Can Thi Bich Ngoc, Vu Chi Dung, Sarju G Mehta, Gareth Baynam, Julian P Hamilton-Shield, Sara Aljareh, Oluwakemi Lokulo-Sodipe, Rachel Horton, Reiner Siebert, Miriam Elbracht, Isabel Karen Temple, Thomas Eggermann, Deborah J G Mackay
BACKGROUND: Genomic imprinting results from the resistance of germline epigenetic marks to reprogramming in the early embryo for a small number of mammalian genes. Genetic, epigenetic or environmental insults that prevent imprints from evading reprogramming may result in imprinting disorders, which impact growth, development, behaviour and metabolism. We aimed to identify genetic defects causing imprinting disorders by whole-exome sequencing in families with one or more members affected by multilocus imprinting disturbance...
March 24, 2018: Journal of Medical Genetics
https://www.readbyqxmd.com/read/29572195/biallelic-unc80-mutations-caused-infantile-hypotonia-with-psychomotor-retardation-and-characteristic-facies-2-in-two-chinese-patients-with-variable-phenotypes
#13
Yunjuan He, Xing Ji, Hui Yan, Xiantao Ye, Yu Liu, Wei Wei, Bing Xiao, Yu Sun
Biallelic UNC80 mutations cause infantile hypotonia with psychomotor retardation and characteristic facies 2 (IHPRF2), which is characterized by hypotonia, developmental delay (DD)/intellectual disability (ID), intrauterine growth retardation, postnatal growth retardation and characteristic facial features. We report two unrelated Chinese patients with compound heterozygous UNC80 mutations inherited from their parents, as identified by whole-exome sequencing (WES). Mutations c.3719G>A (p.W1240*)/c.4926_4937del (p...
March 20, 2018: Gene
https://www.readbyqxmd.com/read/29560374/-de-novo-variants-in-camk2a-and-camk2b-cause-neurodevelopmental-disorders
#14
Tenpei Akita, Kazushi Aoto, Mitsuhiro Kato, Masaaki Shiina, Hiroki Mutoh, Mitsuko Nakashima, Ichiro Kuki, Shin Okazaki, Shinichi Magara, Takashi Shiihara, Kenji Yokochi, Kaori Aiba, Jun Tohyama, Chihiro Ohba, Satoko Miyatake, Noriko Miyake, Kazuhiro Ogata, Atsuo Fukuda, Naomichi Matsumoto, Hirotomo Saitsu
Objective: α ( CAMK2A ) and β ( CAMK2B ) isoforms of Calcium/calmodulin-dependent protein kinase II (CaMKII) play a pivotal role in neuronal plasticity and in learning and memory processes in the brain. Here, we explore the possible involvement of α - and β -CaMKII variants in neurodevelopmental disorders. Methods: Whole-exome sequencing was performed for 976 individuals with intellectual disability, developmental delay, and epilepsy. The effect of CAMK2A and CAMK2B variants on CaMKII structure and firing of neurons was evaluated by computational structural analysis, immunoblotting, and electrophysiological analysis...
March 2018: Annals of Clinical and Translational Neurology
https://www.readbyqxmd.com/read/29558889/naa10-dysfunction-with-normal-nata-complex-activity-in-a-girl-with-non-syndromic-id-and-a-de-novo-naa10-p-v111g-variant-a-case-report
#15
Nina McTiernan, Svein Isungset Støve, Ingvild Aukrust, Marita Torrisen Mårli, Line M Myklebust, Gunnar Houge, Thomas Arnesen
BACKGROUND: The NAA10-NAA15 (NatA) protein complex is an N-terminal acetyltransferase responsible for acetylating ~ 40% of eukaryotic proteins. In recent years, NAA10 variants have been found in patients with an X-linked developmental disorder called Ogden syndrome in its most severe form and, in other familial or de novo cases, with variable degrees of syndromic intellectual disability (ID) affecting both sexes. CASE PRESENTATION: Here we report and functionally characterize a novel and de novo NAA10 (NM_003491...
March 20, 2018: BMC Medical Genetics
https://www.readbyqxmd.com/read/29556724/de-novo-apparent-loss-of-function-mutations-in-prr12-in-three-patients-with-intellectual-disability-and-iris-abnormalities
#16
Magalie S Leduc, Marianne Mcguire, Suneeta Madan-Khetarpal, Damara Ortiz, Susan Hayflick, Kory Keller, Christine M Eng, Yaping Yang, Weimin Bi
PRR12 encodes a proline-rich protein nuclear factor suspected to be involved in neural development. Its nuclear expression in fetal brains and in the vision system supports its role in brain and eye development more specifically. However, its function and potential role in human disease has not been determined. Recently, a de novo t(10;19) (q22.3;q13.33) translocation disrupting the PRR12 gene was detected in a girl with intellectual disability and neuropsychiatric alterations. Here we report on three unrelated patients with heterozygous de novo apparent loss-of-function mutations in PRR12 detected by clinical whole exome sequencing: c...
March 19, 2018: Human Genetics
https://www.readbyqxmd.com/read/29554876/clinical-utility-of-exome-sequencing-in-individuals-with-large-homozygous-regions-detected-by-chromosomal-microarray-analysis
#17
Aparna Prasad, Matthew A Sdano, Rena J Vanzo, Patricia A Mowery-Rushton, Moises A Serrano, Charles H Hensel, E Robert Wassman
BACKGROUND: Chromosomal microarray analysis (CMA) is recommended as the first-tier clinical diagnostic test for individuals with developmental disabilities. In addition to detecting copy number variations, CMA platforms with single nucleotide polymorphism probes can detect large homozygous regions within the genome, which represent potential risk for recessively inherited disorders. METHODS: To determine the frequency in which pathogenic or likely pathogenic variants can be detected in these regions of homozygosity, we performed whole exome sequencing (WES) in 53 individuals where homozygosity was detected by CMA...
March 20, 2018: BMC Medical Genetics
https://www.readbyqxmd.com/read/29547829/atypical-pyridoxine-dependent-epilepsy-resulting-from-a-new-homozygous-missense-mutation-in-aldh7a1
#18
Zahraa Haidar, Nadine Jalkh, Sandra Corbani, Ali Fawaz, Eliane Chouery, André Mégarbané
Pyridoxine dependent epilepsy (PDE) is a rare autosomal recessive neurometabolic disorder. In the classical form, seizures are observed within the first month of life, while in the atypical form seizures appear later in life, sometimes as late as at the age of 3 years of life. Both types are unresponsive to conventional anticonvulsant therapy, but can be controlled with pyridoxine monotherapy. Mutations in the ALDH7A1 gene, encoding α-aminoadipic semialdehyde dehydrogenase have been reported to cause this disease in most patients...
March 10, 2018: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/29531481/further-delineation-of-the-clinical-phenotype-of-cerebellar-ataxia-mental-retardation-and-disequilibrium-syndrome-type-4
#19
Saud Alsahli, Muhammad Talal Alrifai, Saeed Al Tala, Fuad Al Mutairi, Majid Alfadhel
Background: Cerebellar ataxia, mental retardation, and disequilibrium syndrome (CAMRQ) is a heterogeneous group of genetic disorders that have been grouped by shared clinical features; all of these features are transmitted via an autosomal recessive mechanism. Four variants of this syndrome have been identified so far, and each one differs in terms of both clinical and genotypical features. CAMRQ4 is a rare genetic disorder characterized by mental retardation, ataxia or an inability to walk, dysarthria and, in some patients, quadrupedal gait...
2018: Journal of Central Nervous System Disease
https://www.readbyqxmd.com/read/29510241/a-male-case-with-cdkl5-associated-encephalopathy-manifesting-transient-methylmalonic-acidemia
#20
Satoshi Akamine, Yoshito Ishizaki, Yasunari Sakai, Hiroyuki Torisu, Ryoko Fukai, Noriko Miyake, Kazuhiro Ohkubo, Hiroshi Koga, Masafumi Sanefuji, Ayumi Sakata, Masahiko Kimura, Seiji Yamaguchi, Osamu Sakamoto, Toshiro Hara, Hirotomo Saitsu, Naomichi Matsumoto, Shouichi Ohga
Mutations in the X-linked gene CDKL5 cause early-onset epileptic encephalopathy and severe developmental delay. Because this disorder predominantly affects females, the full clinical spectrum of male patients remains elusive. We herein report a 16-year-old boy, who suffered from intractable seizures 20 days after birth. Serial electroencephalograms detected recurrent focal epileptiform discharges from age 4 months, which evolved to hypsarrhythmia later in infancy. Mass-spectrometric analyses revealed increase in urinary excretion of methylmalonic acid without perturbed concentrations of propionic acid, homocystein and methionine...
March 3, 2018: European Journal of Medical Genetics
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