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Developmental delay AND whole exome sequencing

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https://www.readbyqxmd.com/read/28515470/a-novel-missense-mutation-in-the-hect-domain-of-nedd4l-identified-in-a-girl-with-periventricular-nodular-heterotopia-polymicrogyria-and-cleft-palate
#1
Koji Kato, Fuyuki Miya, Ikumi Hori, Daisuke Ieda, Kei Ohashi, Yutaka Negishi, Ayako Hattori, Nobuhiko Okamoto, Mitsuhiro Kato, Tatsuhiko Tsunoda, Mami Yamasaki, Yonehiro Kanemura, Kenjiro Kosaki, Shinji Saitoh
We identified a novel de novo heterozygous missense mutation in the NEDD4L gene (NM_015277: c.2617G>A; p.Glu873Lys) through whole-exome sequencing in a 3-year-old girl showing severe global developmental delay, infantile spasms, cleft palate, periventricular nodular heterotopia and polymicrogyria. Mutations in the HECT domain of NEDD4L have been reported in patients with a neurodevelopmental disorder along with similar brain malformations. All patients reported with NEDD4L HECT domain mutations showed periventricular nodular heterotopia, and most had seizures, cortex anomalies, cleft palate and syndactyly...
May 18, 2017: Journal of Human Genetics
https://www.readbyqxmd.com/read/28514307/exome-sequencing-identifies-a-de-novo-mutation-of-ctnnb1-gene-in-a-patient-mainly-presented-with-retinal-detachment-lens-and-vitreous-opacities-microcephaly-and-developmental-delay-case-report-and-literature-review
#2
Niu Li, Yufei Xu, Guoqiang Li, Tingting Yu, Ru-En Yao, Xiumin Wang, Jian Wang
RATIONALE: The CTNNB1 (β-catenin) gene is well known for its crucial role in cell adhesion and the Wnt-signaling pathway. Previous studies have shown that gain-of-function mutations in the CTNNB1 gene contribute to the occurrence and development of a variety of carcinomas in humans. Recently, de novo, heterozygous, loss-of-function mutations of the CTNNB1 gene were found that partially explain intellectual disability in some patients. Other major clinical symptoms in these patients included microcephaly, abnormal facial features, motor delays, speech impairments, and deformities of the hands and feet...
May 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28513610/haploinsufficiency-of-znf462-is-associated-with-craniofacial-anomalies-corpus-callosum-dysgenesis-ptosis-and-developmental-delay
#3
Karin Weiss, Kristen Wigby, Madeleine Fannemel, Lindsay B Henderson, Natalie Beck, Neeti Ghali, D D D Study, Britt-Marie Anderlid, Johanna Lundin, Ada Hamosh, Marilyn C Jones, Sondhya Ghedia, Maximilian Muenke, Paul Kruszka
The introduction of whole-exome sequencing into the Pediatric Genetics clinic has increased the identification of novel genes associated with neurodevelopmental disorders and congenital anomalies. This agnostic approach has shed light on multiple proteins and pathways not previously known to be associated with disease. Here we report eight subjects from six families with predicted loss of function variants in ZNF462, a zinc-finger protein of unknown function. These individuals have overlapping phenotypes that include ptosis, metopic ridging, craniosynostosis, dysgenesis of the corpus callosum, and developmental delay...
May 17, 2017: European Journal of Human Genetics: EJHG
https://www.readbyqxmd.com/read/28496994/novel-causative-variants-in-dyrk1a-kars-and-kat6a-associated-with-intellectual-disability-and-additional-phenotypic-features
#4
Clark R Murray, Samantha N Abel, Matthew B McClure, Joseph Foster, Maria I Walke, Parul Jayakar, Guney Bademci, Mustafa Tekin
Patients with unclear patterns of developmental and cognitive delay may go years without a definitive diagnosis despite extensive testing due to overlapping phenotypes of many genetic disorders. In this study, we identified causative variants in DYRK1A, KARS, or KAT6A in four individuals with global developmental delay and various findings including microcephaly and sensorineural hearing loss using whole exome sequencing. We present the cognitive, neurologic, and physical findings of four individuals to expand the clinical knowledge of possible features of the phenotypes of three rare genetic disorders...
June 2017: Journal of Pediatric Genetics
https://www.readbyqxmd.com/read/28493104/hypomyelinating-leukodystrophy-associated-with-a-deleterious-mutation-in-the-atrn-gene
#5
Maher Awni Shahrour, Motee Ashhab, Simon Edvardson, Michal Gur, Bassam Abu-Libdeh, Orly Elpeleg
Hypomyelinating leukodystrophies are a group of neurodevelopmental disorders that affect proper formation of the myelin sheath in the central nervous system. They are characterized by developmental delay, hypotonia, spasticity, and variable intellectual disability. We used whole exome analysis to study the molecular basis of hypomyelinating leukodystrophy in two sibs from a consanguineous family. A homozygous mutation, c.3068+5G>A, was identified in the ATRN gene, with the consequent insertion of an intronic sequence into the patients' cDNA and a predicted premature termination of the ATRN polypeptide...
May 10, 2017: Neurogenetics
https://www.readbyqxmd.com/read/28489339/de-novo-igf2-mutation-on-the-paternal-allele-in-a-patient-with-silver-russell-syndrome-and-ectrodactyly
#6
Kaori Yamoto, Hirotomo Saitsu, Norio Nakagawa, Hisakazu Nakajima, Tatsuji Hasegawa, Yasuko Fujisawa, Masayo Kagami, Maki Fukami, Tsutomu Ogata
Although paternally expressed IGF2 is known to play a critical role in placental and body growth, only a single mutation has been found in IGF2. We identified, through whole exome sequencing, a de novo IGF2 indel mutation leading to frameshift (NM_000612.5:c.110_117delinsAGGTAA, p.(Leu37Glnfs*31)) in a patient with Silver-Russell syndrome, ectrodactyly, undermasculinized genitalia, developmental delay, and placental hypoplasia. Furthermore, we demonstrated that the mutation resided on the paternal allele by sequencing the long-PCR product harboring the mutation and methylation sensitive SmaI and SalI sites before and after SmaI/SalI digestion...
May 10, 2017: Human Mutation
https://www.readbyqxmd.com/read/28486374/premature-thelarche-and-the-pura-syndrome
#7
Joshua Rezkalla, Tiffany Von Wald, Keith A Hansen
BACKGROUND: Premature thelarche is a self-limited condition characterized by Tanner stage II-III breast development in girls younger than 8 years of age with no evidence of advancing puberty. Evaluation concentrates on excluding central or peripheral causes of precocious puberty. CASE: A girl aged 2 years 4 months with profound hypotonia and delayed developmental milestones presented with Tanner II breast development, elevated follicle-stimulating hormone levels, suppressed luteinizing hormone level, normal growth and skeletal development, and prepubertal uterine length and ovarian volume...
June 2017: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28475290/whole-exome-sequencing-of-families-with-1q21-1-microdeletion-or-microduplication
#8
Ying Qiao, Chansonette Badduke, Flamingo Tang, David Cowieson, Sally Martell, Suzanne M E Lewis, Maria S Peñaherrera, Wendy P Robinson, Allen Volchuk, Evica Rajcan-Separovic
Recurrent microduplications/microdeletions of 1q21.1 are characterized by variable phenotypes ranging from normal development to developmental delay (DD) and congenital anomalies. Their interpretation is challenging especially in families with affected and unaffected carriers. We used whole exome sequencing (WES) to look for sequence variants in two male probands with inherited 1q21.1 CNVs that could explain their more severe phenotypes. One proband had a 1q21.1 deletion transmitted from maternal grandmother, while the other had a paternal duplication...
May 5, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/28464511/plxna1-developmental-encephalopathy-with-syndromic-features-a-case-report-and-review-of-the-literature
#9
Kaylee Park, Laurie E Seltzer, Emily Tuttle, Ghayda M Mirzaa, Alex R Paciorkowski
Developmental encephalopathies constitute a broad and genetically heterogeneous spectrum of disorders associated with global developmental delay, intellectual disability, frequent epilepsy, and other neurofunctional abnormalities. Here, we report a male presenting with infantile onset epilepsy and syndromic features resembling Dubowitz syndrome identified to have a de novo PLXNA1 variant by whole exome sequencing. This constitutes the second report of PLXNA1 sequence variation associated with early onset epilepsy, and the first to expand on the clinical features of this emerging disorder...
May 2, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/28446798/novel-missense-mutation-in-dll4-in-a-japanese-sporadic-case-of-adams-oliver-syndrome
#10
Miwako Nagasaka, Mariko Taniguchi-Ikeda, Hidehito Inagaki, Yuya Ouchi, Daisuke Kurokawa, Keiji Yamana, Risa Harada, Kandai Nozu, Yoshitada Sakai, Sushil K Mishra, Yoshiki Yamaguchi, Ichiro Morikoka, Tatsushi Toda, Hiroki Kurahashi, Kazumoto Iijima
Adams-Oliver syndrome (AOS, OMIM; 100300) is a rare genetic disease characterized by aplasia cutis congenita, terminal transverse limb defects and cutis marmorata with vascular anomalies such as congenital heart defects. The etiology of this syndrome has remained largely unknown but defective Notch signaling during vascular formation has been suggested. Here we describe a sporadic Japanese newborn case with clinically diagnosed AOS. Trio whole-exome sequencing identified a de novo, novel, heterozygous missense mutation in the Delta-like 4 ligand gene (DLL4 c...
April 27, 2017: Journal of Human Genetics
https://www.readbyqxmd.com/read/28422131/variants-in-cplx1-in-two-families-with-autosomal-recessive-severe-infantile-myoclonic-epilepsy-and-id
#11
Silke Redler, Tim M Strom, Thomas Wieland, Kirsten Cremer, Hartmut Engels, Felix Distelmaier, Jörg Schaper, Alma Küchler, Johannes R Lemke, Stephanie Jeschke, Nicole Schreyer, Heinrich Sticht, Margarete Koch, Hermann-Josef Lüdecke, Dagmar Wieczorek
For a large number of individuals with intellectual disability (ID), the molecular basis of the disorder is still unknown. However, whole-exome sequencing (WES) is providing more and more insights into the genetic landscape of ID. In the present study, we performed trio-based WES in 311 patients with unsolved ID and additional clinical features, and identified homozygous CPLX1 variants in three patients with ID from two unrelated families. All displayed marked developmental delay and migrating myoclonic epilepsy, and one showed a cerebellar cleft in addition...
April 19, 2017: European Journal of Human Genetics: EJHG
https://www.readbyqxmd.com/read/28417072/atypical-juvenile-presentation-of-gm2-gangliosidosis-ab-in-a-patient-compound-heterozygote-for-c-259g%C3%A2-%C3%A2-t-and-c-164c%C3%A2-%C3%A2-t-mutations-in-the-gm2a-gene
#12
Carla Martins, Catherine Brunel-Guitton, Anne Lortie, France Gauvin, Carlos R Morales, Grant A Mitchell, Alexey V Pshezhetsky
GM2-gangliosidosis, AB variant is an extremely rare autosomal recessive inherited disorder caused by mutations in the GM2A gene that encodes GM2 ganglioside activator protein (GM2AP). GM2AP is necessary for solubilisation of GM2 ganglioside in endolysosomes and its presentation to β-hexosaminidase A. Conversely GM2AP deficiency impairs lysosomal catabolism of GM2 ganglioside, leading to its storage in cells and tissues. We describe a 9-year-old child with an unusual juvenile clinical onset of GM2-gangliosidosis AB...
June 2017: Molecular Genetics and Metabolism Reports
https://www.readbyqxmd.com/read/28377545/a-novel-wdr62-mutation-causes-primary-microcephaly-in-a-large-consanguineous-saudi-family
#13
Muhammad Imran Naseer, Mahmood Rasool, Sameera Sogaty, Rukhaa Adeel Chaudhary, Haifa Mansour Mansour, Adeel G Chaudhary, Adel M Abuzenadah, Mohammad H Al-Qahtani
BACKGROUND: Primary microcephaly (MCPH) is a rare developmental defect characterized by impaired cognitive functions, retarded neurodevelopment and reduced brain size. It is genetically heterogeneous and more than 17 genes so far have been identified that are associated with this disease. OBJECTIVE: To study the genetic defect in a consanguineous Saudi family with primary microcephaly. DESIGN: Cross-sectional clinical genetics study of a Saudi family...
March 2017: Annals of Saudi Medicine
https://www.readbyqxmd.com/read/28343847/global-developmental-delay-and-intellectual-disability-associated-with-a-de-novo-top2b-mutation
#14
Ching-Wan Lam, Wai-Lan Yeung, Chun-Yiu Law
BACKGROUND: More than 100 genes had been identified for autism spectrum disorder (ASD). With the advancement of whole-exome/genome sequencing (WES/WGS), disease-causing gene in ASD can be identified in a holistic and unbiased approach. The identification of new ASD genes can further explore the molecular basis of ASD. METHODS: We report a 15yo girl with developmental delay, intellectual disability, hypotonia, microcephaly and autistic feature. She first presented at 6months old with primitive response to noise...
March 23, 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/28332767/bcap31-associated-encephalopathy-and-complex-movement-disorder-mimicking-mitochondrial-encephalopathy
#15
Saleh Albanyan, Amal Al Teneiji, Nasim Monfared, Saadet Mercimek-Mahmutoglu
BCAP31, encoded by BCAP31, is involved in the export of transmembrane proteins from the endoplasmic reticulum. Pathogenic variants in BCAP31 results in global developmental delay, dystonia, deafness and dysmorphic features in males, called deafness, dystonia, and cerebral hypomyelination (DDCH) syndrome. We report a new patient with BCAP3-associated encephalopathy, DDCH syndrome, sensorineural hearing loss, generalized dystonia, and choreoathetosis. This 3.5-year-old boy had microcephaly and failure to thrive within the first 3 months of life...
June 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/28286008/compound-heterozygous-variants-in-robo1-cause-a-neurodevelopmental-disorder-with-absence-of-transverse-pontine-fibers-and-thinning-of-the-anterior-commissure-and-corpus-callosum
#16
Sonia F Calloni, Julie S Cohen, Avner Meoded, Jane Juusola, Fabio M Triulzi, Thierry A G M Huisman, Andrea Poretti, Ali Fatemi
BACKGROUND: Axonal guidance disorders are characterized by white matter tracts with an anomalous course, failure to cross the midline, or presence of anomalous white matter tracts. Diffusion tensor imaging (DTI) is a suitable noninvasive, in vivo neuroimaging tool to study axonal guidance disorders. We describe a novel disorder in a boy with compound heterozygous variants in the ROBO1 gene. PATIENT DESCRIPTION: The child was referred at age 13 months because of developmental delay...
February 2, 2017: Pediatric Neurology
https://www.readbyqxmd.com/read/28256214/opposing-effects-on-nav1-2-function-underlie-differences-between-scn2a-variants-observed-in-individuals-with-autism-spectrum-disorder-or-infantile-seizures
#17
Roy Ben-Shalom, Caroline M Keeshen, Kiara N Berrios, Joon Y An, Stephan J Sanders, Kevin J Bender
BACKGROUND: Variants in the SCN2A gene that disrupt the encoded neuronal sodium channel NaV1.2 are important risk factors for autism spectrum disorder (ASD), developmental delay, and infantile seizures. Variants observed in infantile seizures are predominantly missense, leading to a gain of function and increased neuronal excitability. How variants associated with ASD affect NaV1.2 function and neuronal excitability are unclear. METHODS: We examined the properties of 11 ASD-associated SCN2A variants in heterologous expression systems using whole-cell voltage-clamp electrophysiology and immunohistochemistry...
January 27, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28255779/mutations-in-slc25a22-hyperprolinaemia-vacuolated-fibroblasts-and-presentation-with-developmental-delay
#18
Emma S Reid, Hywel Williams, Glenn Anderson, Malika Benatti, Kling Chong, Chela James, Louise Ocaka, Cheryl Hemingway, Daniel Little, Richard Brown, Alasdair Parker, Simon Holden, Emma Footitt, Shamima Rahman, Paul Gissen, Philippa B Mills, Peter T Clayton
Mutations in SLC25A22 are known to cause neonatal epileptic encephalopathy and migrating partial seizures in infancy. Using whole exome sequencing we identified four novel SLC25A22 mutations in six children from three families. Five patients presented clinical features similar to those in the literature including hypotonia, refractory neonatal-onset seizures and developmental delay. However, the sixth patients presented atypically with isolated developmental delay, developing late-onset (absence) seizures only at 7 years of age...
May 2017: Journal of Inherited Metabolic Disease
https://www.readbyqxmd.com/read/28253385/association-of-steroid-5%C3%AE-reductase-type-3-congenital-disorder-of-glycosylation-with-early-onset-retinal-dystrophy
#19
Rachel L Taylor, Gavin Arno, James A Poulter, Kamron N Khan, Jiten Morarji, Sarah Hull, Nikolas Pontikos, Antonio Rueda Martin, Katherine R Smith, Manir Ali, Carmel Toomes, Martin McKibbin, Jill Clayton-Smith, Stephanie Grunewald, Michel Michaelides, Anthony T Moore, Alison J Hardcastle, Chris F Inglehearn, Andrew R Webster, Graeme C Black
Importance: Steroid 5α-reductase type 3 congenital disorder of glycosylation (SRD5A3-CDG) is a rare disorder of N-linked glycosylation. Its retinal phenotype is not well described but could be important for disease recognition because it appears to be a consistent primary presenting feature. Objective: To investigate a series of patients with the same mutation in the SRD5A3 gene and thereby characterize its retinal manifestations and other associated features. Design, Setting and Participants: Seven affected individuals from 4 unrelated families with early-onset retinal dystrophy as a primary manifestation underwent comprehensive ophthalmic assessment, including retinal imaging and electrodiagnostic testing...
April 1, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28250421/ankrd11-variants-cause-variable-clinical-features-associated-with-kbg-syndrome-and-coffin-siris-like-syndrome
#20
Satoko Miyatake, Nobuhiko Okamoto, Zornitza Stark, Makoto Nabetani, Yoshinori Tsurusaki, Mitsuko Nakashima, Noriko Miyake, Takeshi Mizuguchi, Akira Ohtake, Hirotomo Saitsu, Naomichi Matsumoto
KBG syndrome (KBGS) is an autosomal dominant multiple congenital anomaly-intellectual disability syndrome, characterized by developmental delay with neurological involvements, macrodontia of the upper central incisors, characteristic facial dysmorphism and skeletal anomalies. Variants in ANKRD11 cause KBGS. We present five individuals from four families with ANKRD11 variants identified by whole-exome sequencing. Four of the five were clinically affected, and their diagnoses were varied. One was typical KBGS, two were Coffin-Siris syndrome-like (CSS), and one was intellectual disability with infantile spasms...
March 2, 2017: Journal of Human Genetics
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