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Developmental delay AND while exome sequencing

Johannes Koch, Johannes A Mayr, Bader Alhaddad, Christian Rauscher, Jörgen Bierau, Reka Kovacs-Nagy, Karlien L M Coene, Ingrid Bader, Monika Holzhacker, Holger Prokisch, Hanka Venselaar, Ron A Wevers, Felix Distelmaier, Tilman Polster, Steffen Leiz, Cornelia Betzler, Tim M Strom, Wolfgang Sperl, Thomas Meitinger, Saskia B Wortmann, Tobias B Haack
Unexplained global developmental delay and epilepsy in childhood pose a major socioeconomic burden. Progress in defining the molecular bases does not often translate into effective treatment. Notable exceptions include certain inborn errors of metabolism amenable to dietary intervention. CAD encodes a multifunctional enzyme involved in de novo pyrimidine biosynthesis. Alternatively, pyrimidines can be recycled from uridine. Exome sequencing in three families identified biallelic CAD mutations in four children with global developmental delay, epileptic encephalopathy, and anaemia with anisopoikilocytosis...
December 21, 2016: Brain: a Journal of Neurology
Nisha Patel, Deepti Anand, Dorota Monies, Sateesh Maddirevula, Arif O Khan, Talal Algoufi, Mohammed Alowain, Eissa Faqeih, Muneera Alshammari, Ahmed Qudair, Hadeel Alsharif, Fatimah Aljubran, Hessa S Alsaif, Niema Ibrahim, Firdous M Abdulwahab, Mais Hashem, Haifa Alsedairy, Mohammed A Aldahmesh, Salil A Lachke, Fowzan S Alkuraya
Pediatric cataract is highly heterogeneous clinically and etiologically. While mostly isolated, cataract can be part of many multisystem disorders, further complicating the diagnostic process. In this study, we applied genomic tools in the form of a multi-gene panel as well as whole-exome sequencing on unselected cohort of pediatric cataract (166 patients from 74 families). Mutations in previously reported cataract genes were identified in 58% for a total of 43 mutations, including 15 that are novel. GEMIN4 was independently mutated in families with a syndrome of cataract, global developmental delay with or without renal involvement...
November 22, 2016: Human Genetics
Tamar Harel, Wan Hee Yoon, Caterina Garone, Shen Gu, Zeynep Coban-Akdemir, Mohammad K Eldomery, Jennifer E Posey, Shalini N Jhangiani, Jill A Rosenfeld, Megan T Cho, Stephanie Fox, Marjorie Withers, Stephanie M Brooks, Theodore Chiang, Lita Duraine, Serkan Erdin, Bo Yuan, Yunru Shao, Elie Moussallem, Costanza Lamperti, Maria A Donati, Joshua D Smith, Heather M McLaughlin, Christine M Eng, Magdalena Walkiewicz, Fan Xia, Tommaso Pippucci, Pamela Magini, Marco Seri, Massimo Zeviani, Michio Hirano, Jill V Hunter, Myriam Srour, Stefano Zanigni, Richard Alan Lewis, Donna M Muzny, Timothy E Lotze, Eric Boerwinkle, Richard A Gibbs, Scott E Hickey, Brett H Graham, Yaping Yang, Daniela Buhas, Donna M Martin, Lorraine Potocki, Claudio Graziano, Hugo J Bellen, James R Lupski
ATPase family AAA-domain containing protein 3A (ATAD3A) is a nuclear-encoded mitochondrial membrane protein implicated in mitochondrial dynamics, nucleoid organization, protein translation, cell growth, and cholesterol metabolism. We identified a recurrent de novo ATAD3A c.1582C>T (p.Arg528Trp) variant by whole-exome sequencing (WES) in five unrelated individuals with a core phenotype of global developmental delay, hypotonia, optic atrophy, axonal neuropathy, and hypertrophic cardiomyopathy. We also describe two families with biallelic variants in ATAD3A, including a homozygous variant in two siblings, and biallelic ATAD3A deletions mediated by nonallelic homologous recombination (NAHR) between ATAD3A and gene family members ATAD3B and ATAD3C...
October 6, 2016: American Journal of Human Genetics
Eriko Nishi, Koji Masuda, Michiko Arakawa, Hiroshi Kawame, Tomoki Kosho, Masashi Kitahara, Noriko Kubota, Eiko Hidaka, Yuki Katoh, Katsuhiko Shirahige, Kosuke Izumi
In a clinical setting, the number of organ systems involved is crucial for the differential diagnosis of congenital genetic disorders. When more than one organ system is involved, a syndromic diagnosis is suspected. In this report, we describe three patients with apparently syndromic features. Exome sequencing identified non-syndromic gene mutations as a potential cause of part of their phenotype. The first patient (Patient 1) is a girl with cleft lip/palate, meningoencephalocele, tetralogy of Fallot, and developmental delay...
November 2016: American Journal of Medical Genetics. Part A
Johanna Schäfgen, Kirsten Cremer, Jessica Becker, Thomas Wieland, Alexander M Zink, Sarah Kim, Isabelle C Windheuser, Martina Kreiß, Stefan Aretz, Tim M Strom, Dagmar Wieczorek, Hartmut Engels
Recently, germline variants of the transcriptional co-regulator gene TCF20 have been implicated in the aetiology of autism spectrum disorders (ASD). However, the knowledge about the associated clinical picture remains fragmentary. In this study, two individuals with de novo TCF20 sequence variants were identified in a cohort of 313 individuals with intellectual disability of unknown aetiology, which was analysed by whole exome sequencing using a child-parent trio design. Both detected variants - one nonsense and one frameshift variant - were truncating...
December 2016: European Journal of Human Genetics: EJHG
Mohammed Zain Seidahmed, Mustafa A Salih, Omer B Abdulbasit, Abdulmohsen Samadi, Khalid Al Hussien, Abeer M Miqdad, Maha S Biary, Anas M Alazami, Ibrahim A Alorainy, Mohammad M Kabiraj, Ranad Shaheen, Fowzan S Alkuraya
BACKGROUND: Asparagine synthetase deficiency (OMIM# 615574) is a very rare newly described neurometabolic disorder characterized by congenital microcephaly and severe global developmental delay, associated with intractable seizures or hyperekplexia. Brain MRI typically shows cerebral atrophy with simplified gyral pattern and delayed myelination. Only 12 cases have been described to date. The disease is caused by homozygous or compound heterozygous mutations in the ASNS gene on chromosome 7q21...
July 15, 2016: BMC Neurology
Pratibha Nair, Abdul Rezzak Hamzeh, Madiha Mohamed, Fatima Saif, Nafisa Tawfiq, Majdi El Halik, Mahmoud Taleb Al-Ali, Fatma Bastaki
Microcephaly is a rare neurological condition, both in isolation and when it occurs as part of a syndrome. One of the syndromic forms of microcephaly is microcephaly, seizures and developmental delay (MCSZ) (OMIM #613402), a rare autosomal recessive neurodevelopmental disorder with a range of phenotypic severity, and known to be caused by mutations in the polynucleotide kinase 3' phosphatase (PNKP) gene. The PNK protein is a key enzyme involved in the repair of single and double stranded DNA breaks, a process which is particularly important in the nervous system...
August 2016: American Journal of Medical Genetics. Part A
Habib Bouazzi, Seema Thakur, Carlos Trujillo, Mohammad Khalid Alwasiyah, Arnold Munnich
BACKGROUND & OBJECTIVES: ATRX is a recessive X-linked intellectual deficiency (X-LID) gene causing predominately alpha-thalassaemia with a wide and clinically heterogeneous spectrum of intellectual deficiency syndromes. Although alpha-thalassaemia is commonly present, some patients do not express this sign despite the ATRX gene being altered. Most pathological mutations have been localized in two different major domains, the helicase and the plant homeo-domain (PHD)-like domain. In this study we examined a family of three males having an X-linked mental deficiency and developmental delay, and tried to establish a genetic diagnosis while discussing and comparing the phenotype of our patients to those reported in the literature...
January 2016: Indian Journal of Medical Research
Ruth Sheffer, Liza Douiev, Simon Edvardson, Avraham Shaag, Khaled Tamimi, Devorah Soiferman, Vardiella Meiner, Ann Saada
An emerging class of mitochondrial disorders is caused by mutations in nuclear genes affecting mitochondrial dynamics and function. One of these is the DNM1L gene encoding the dynamin-related protein 1 (DRP1), which is pivotal in the mitochondrial fission process. Here, we describe a patient with a novel dominant-negative, de novo DNM1L mutation, which expands the clinical spectrum. The patient reported here exhibits a chronic neurological disorder, characterized by postnatal microcephaly, developmental delay, and pain insensitivity...
June 2016: American Journal of Medical Genetics. Part A
Cameron Mroske, Kristen Rasmussen, Deepali N Shinde, Robert Huether, Zoe Powis, Hsiao-Mei Lu, Ruth M Baxter, Elizabeth McPherson, Sha Tang
BACKGROUND: In humans, Mammalian Target of Rapamycin (MTOR) encodes a 300 kDa serine/ threonine protein kinase that is ubiquitously expressed, particularly at high levels in brain. MTOR functions as an integrator of multiple cellular processes, and in so doing either directly or indirectly regulates the phosphorylation of at least 800 proteins. While somatic MTOR mutations have been recognized in tumors for many years, and more recently in hemimegalencephaly, germline MTOR mutations have rarely been described...
2015: BMC Medical Genetics
Adam P DeLuca, S Scott Whitmore, Jenna Barnes, Tasneem P Sharma, Trudi A Westfall, C Anthony Scott, Matthew C Weed, Jill S Wiley, Luke A Wiley, Rebecca M Johnston, Michael J Schnieders, Steven R Lentz, Budd A Tucker, Robert F Mullins, Todd E Scheetz, Edwin M Stone, Diane C Slusarski
Retinitis pigmentosa (RP) is a highly heterogeneous group of disorders characterized by degeneration of the retinal photoreceptor cells and progressive loss of vision. While hundreds of mutations in more than 100 genes have been reported to cause RP, discovering the causative mutations in many patients remains a significant challenge. Exome sequencing in an individual affected with non-syndromic RP revealed two plausibly disease-causing variants in TRNT1, a gene encoding a nucleotidyltransferase critical for tRNA processing...
January 1, 2016: Human Molecular Genetics
Yu Kobayashi, Jun Tohyama, Mitsuhiro Kato, Noriyuki Akasaka, Shinichi Magara, Hideshi Kawashima, Tsukasa Ohashi, Hideaki Shiraishi, Mitsuko Nakashima, Hirotomo Saitsu, Naomichi Matsumoto
OBJECTIVE: Recent studies have elucidated causative roles for genetic abnormalities in early-onset epileptic encephalopathies (EOEE). Accompanying characteristic features, in addition to seizures, have also been suggested to provide important clues for an early and accurate genetic diagnosis of affected patients. In this study, we investigated the underlying genetic causes in patients with EOEE associated with infantile movement disorders. METHODS: We examined 11 patients with EOEE and involuntary movements (nine with West syndrome and two with nonsyndromic epileptic encephalopathy)...
March 2016: Brain & Development
Hirotomo Saitsu, Tenpei Akita, Jun Tohyama, Hadassa Goldberg-Stern, Yu Kobayashi, Roni Cohen, Mitsuhiro Kato, Chihiro Ohba, Satoko Miyatake, Yoshinori Tsurusaki, Mitsuko Nakashima, Noriko Miyake, Atsuo Fukuda, Naomichi Matsumoto
The voltage-gated Kv2.1 potassium channel encoded by KCNB1 produces the major delayed rectifier potassium current in pyramidal neurons. Recently, de novo heterozygous missense KCNB1 mutations have been identified in three patients with epileptic encephalopathy and a patient with neurodevelopmental disorder. However, the frequency of KCNB1 mutations in infantile epileptic patients and their effects on neuronal activity are yet unknown. We searched whole exome sequencing data of a total of 437 patients with infantile epilepsy, and found novel de novo heterozygous missense KCNB1 mutations in two patients showing psychomotor developmental delay and severe infantile generalized seizures with high-amplitude spike-and-wave electroencephalogram discharges...
2015: Scientific Reports
Karl Hackmann, Andreas Rump, Stefan A Haas, Johannes R Lemke, Jean-Pierre Fryns, Andreas Tzschach, Dagmar Wieczorek, Beate Albrecht, Alma Kuechler, Tim Ripperger, Albrecht Kobelt, Konrad Oexle, Sigrid Tinschert, Evelin Schrock, Vera M Kalscheuer, Nataliya Di Donato
The clinical diagnosis of Lujan-Fryns syndrome (LFS) comprises X-linked intellectual disability (XLID) with marfanoid habitus, distinct combination of minor facial anomalies and nasal speech. However the definition of syndrome was significantly broadened since the original report and implies ID with marfanoid habitus. Mutations of three genes (MED12, UPF3B, and ZDHHC9) have been reported in "broadly defined" LFS. We examined these genes in 28 individuals with a tentative clinical diagnosis of LFS but we did not identify any causative mutation...
January 2016: American Journal of Medical Genetics. Part A
Anne Noreau, Philippe Beauchemin, Alexandre Dionne-Laporte, Patrick A Dion, Guy A Rouleau, Nicolas Dupré
Two affected and one unaffected siblings from a French-Canadian family were evaluated in our neurogenetic clinic. The oldest brother had intentional and postural hand tremor while his youngest sister presented mild ataxia, a similar hand tremor and global developmental delay. Brain MRIs of the two affected family members further revealed a significant cerebellar atrophy. For this study we conducted a whole exome sequencing (WES) investigation using genomic DNA prepared from the affected brother and sister, alongside DNA prepared from their unaffected mother, and identified two mutations previously reported to cause a rare disorder known as Congenital Disorder of Glycosylation, type Ia (CDG1A) (OMIM #212065)...
2014: Cerebellum & Ataxias
J Conroy, N M Allen, K M Gorman, A Shahwan, S Ennis, S A Lynch, M D King
Next-generation sequencing has accelerated the identification of disease genes in many rare genetic disorders including early-onset epileptic encephalopathies (EOEEs). While many of these disorders are caused by neuronal channelopathies, the role of synaptic and related neuronal proteins are increasingly being described. Here, we report a 6-year-old girl with unexplained EOEE characterized by multifocal seizures and profound global developmental delay. Recessive inheritance was considered due to parental consanguinity and Irish Traveller descent...
February 2016: Clinical Genetics
Maja Tarailo-Graovac, Graham Sinclair, Sylvia Stockler-Ipsiroglu, Margot Van Allen, Jacob Rozmus, Casper Shyr, Roberta Biancheri, Tracey Oh, Bryan Sayson, Mirafe Lafek, Colin J Ross, Wendy P Robinson, Wyeth W Wasserman, Andrea Rossi, Clara D M van Karnebeek
BACKGROUND: Phosphatidylinositol glycan biosynthesis class A protein (PIGA) is one of the enzymes involved in the biosynthesis of glycosylphosphatidylinositol (GPI) anchor proteins, which function as enzymes, adhesion molecules, complement regulators and co-receptors in signal transduction pathways. Until recently, only somatic PIGA mutations had been reported in patients with paroxysmal nocturnal hemoglobinuria (PNH), while germline mutations had not been observed, and were suspected to result in lethality...
2015: Orphanet Journal of Rare Diseases
Hilary J Vernon, Rebecca McClellan, Denise A S Batista, Sakkubai Naidu
Recently, mutations in FARS2, which encodes for mitochondrial phenylalanyl-tRNA synthetase, have been implicated in autosomal recessive combined oxidative phosphorylation deficiency 14. Associated clinical features in three previously reported patients with confirmed FARS2 mutations include infantile onset epilepsy, and a fatal Alpers-like encephalopathy. Herein, we report on two siblings with global developmental delay, dysarthria and tremor and compound heterozygous FARS2 abnormalities. They have a heterozygous missense mutation, c...
May 2015: American Journal of Medical Genetics. Part A
Alexander Kolevzon, Benjamin Angarita, Lauren Bush, A Ting Wang, Yitzchak Frank, Amy Yang, Robert Rapaport, Jeffrey Saland, Shubhika Srivastava, Cristina Farrell, Lisa J Edelmann, Joseph D Buxbaum
Autism spectrum disorder (ASD) and intellectual disability (ID) can be caused by mutations in a large number of genes. One example is SHANK3 on the terminal end of chromosome 22q. Loss of one functional copy of SHANK3 results in 22q13 deletion syndrome or Phelan-McDermid syndrome (PMS) and causes a monogenic form of ASD and/or ID with a frequency of 0.5% to 2% of cases. SHANK3 is the critical gene in this syndrome, and its loss results in disruption of synaptic function. With chromosomal microarray analyses now a standard of care in the assessment of ASD and developmental delay, and with the emergence of whole exome and whole genome sequencing in this context, identification of PMS in routine clinical settings will increase significantly...
2014: Journal of Neurodevelopmental Disorders
Bernt Popp, Svein I Støve, Sabine Endele, Line M Myklebust, Juliane Hoyer, Heinrich Sticht, Silvia Azzarello-Burri, Anita Rauch, Thomas Arnesen, André Reis
Recent studies revealed the power of whole-exome sequencing to identify mutations in sporadic cases with non-syndromic intellectual disability. We now identified de novo missense variants in NAA10 in two unrelated individuals, a boy and a girl, with severe global developmental delay but without any major dysmorphism by trio whole-exome sequencing. Both de novo variants were predicted to be deleterious, and we excluded other variants in this gene. This X-linked gene encodes N-alpha-acetyltransferase 10, the catalytic subunit of the NatA complex involved in multiple cellular processes...
May 2015: European Journal of Human Genetics: EJHG
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