13 results on '"Klein Wassink-Ruiter JS"'
Search Results
2. Diagnostic Gene Panel Testing in (Non)-Syndromic Patients with Cleft Lip, Alveolus and/or Palate in the Netherlands.
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Wurfbain LF, Cox IL, van Dooren MF, Lachmeijer AMA, Verhoeven VJM, van Hagen JM, Heijligers M, Klein Wassink-Ruiter JS, Koene S, Maas SM, Veenstra-Knol HE, Ploos van Amstel JK, Massink MPG, Mink van der Molen AB, and van den Boogaard MH
- Abstract
Objectives: Clefts of the lip, alveolus and/or palate (CLA/P) are the most common craniofacial congenital malformations in humans. These oral clefts can be divided into non-syndromic (isolated) and syndromic forms. Many cleft-related syndromes are clinically variable and genetically heterogeneous, making it challenging to distinguish syndromic from non-syndromic cases. Recognition of syndromic/genetic causes is important for personalized tailored care, identification of (unrecognized) comorbidities, and accurate genetic counseling. Therefore, next generation sequencing (NGS)-based targeted gene panel testing is increasingly implemented in diagnostics of CLA/P patients. In this retrospective study, we assess the yield of NGS gene panel testing in a cohort of CLA/P cases., Methods: Whole exome sequencing (WES) followed by variant detection and interpretation in an a priori selected set of genes associated with CLA/P phenotypes was performed in 212 unrelated CLA/P patients after genetic counseling between 2015 and 2020. Medical records including family history and results of additional genetic tests were evaluated., Results: In 24 CLA/P cases (11.3%), a pathogenic genetic variant was identified. Twenty out of these 24 had a genetic syndrome requiring specific monitoring and follow-up. Six of these 24 cases (25%) were presumed to be isolated CLA/P cases prior to testing, corresponding to 2.8% of the total cohort. In eight CLA/P cases (3.8%) without a diagnosis after NGS-based gene panel testing, a molecular diagnosis was established by additional genetic analyses (e.g., SNP array, single gene testing, trio WES)., Conclusion: This study illustrates NGS-based gene panel testing is a powerful diagnostic tool in the diagnostic workup of CLA/P patients. Also, in apparently isolated cases and non-familial cases, a genetic diagnosis can be identified. Early diagnosis facilitates personalized care for patients and accurate genetic counseling of their families., Competing Interests: The authors have no conflicts of interest to declare., (© 2023 The Author(s). Published by S. Karger AG, Basel.)
- Published
- 2023
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3. Widening of the genetic and clinical spectrum of Lamb-Shaffer syndrome, a neurodevelopmental disorder due to SOX5 haploinsufficiency.
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Zawerton A, Mignot C, Sigafoos A, Blackburn PR, Haseeb A, McWalter K, Ichikawa S, Nava C, Keren B, Charles P, Marey I, Tabet AC, Levy J, Perrin L, Hartmann A, Lesca G, Schluth-Bolard C, Monin P, Dupuis-Girod S, Guillen Sacoto MJ, Schnur RE, Zhu Z, Poisson A, El Chehadeh S, Alembik Y, Bruel AL, Lehalle D, Nambot S, Moutton S, Odent S, Jaillard S, Dubourg C, Hilhorst-Hofstee Y, Barbaro-Dieber T, Ortega L, Bhoj EJ, Masser-Frye D, Bird LM, Lindstrom K, Ramsey KM, Narayanan V, Fassi E, Willing M, Cole T, Salter CG, Akilapa R, Vandersteen A, Canham N, Rump P, Gerkes EH, Klein Wassink-Ruiter JS, Bijlsma E, Hoffer MJV, Vargas M, Wojcik A, Cherik F, Francannet C, Rosenfeld JA, Machol K, Scott DA, Bacino CA, Wang X, Clark GD, Bertoli M, Zwolinski S, Thomas RH, Akay E, Chang RC, Bressi R, Sanchez Russo R, Srour M, Russell L, Goyette AE, Dupuis L, Mendoza-Londono R, Karimov C, Joseph M, Nizon M, Cogné B, Kuechler A, Piton A, Klee EW, Lefebvre V, Clark KJ, and Depienne C
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- Adolescent, Adult, Animals, Child, Child, Preschool, Female, Genetic Predisposition to Disease, Haploinsufficiency genetics, Humans, Infant, Intellectual Disability diagnosis, Intellectual Disability pathology, Language Development Disorders diagnosis, Language Development Disorders genetics, Language Development Disorders pathology, Male, Mutation, Missense genetics, Neurodevelopmental Disorders diagnosis, Neurodevelopmental Disorders pathology, Pedigree, Phenotype, Young Adult, DNA-Binding Proteins genetics, Intellectual Disability genetics, Neurodevelopmental Disorders genetics, SOXD Transcription Factors genetics
- Abstract
Purpose: Lamb-Shaffer syndrome (LAMSHF) is a neurodevelopmental disorder described in just over two dozen patients with heterozygous genetic alterations involving SOX5, a gene encoding a transcription factor regulating cell fate and differentiation in neurogenesis and other discrete developmental processes. The genetic alterations described so far are mainly microdeletions. The present study was aimed at increasing our understanding of LAMSHF, its clinical and genetic spectrum, and the pathophysiological mechanisms involved., Methods: Clinical and genetic data were collected through GeneMatcher and clinical or genetic networks for 41 novel patients harboring various types ofSOX5 alterations. Functional consequences of selected substitutions were investigated., Results: Microdeletions and truncating variants occurred throughout SOX5. In contrast, most missense variants clustered in the pivotal SOX-specific high-mobility-group domain. The latter variants prevented SOX5 from binding DNA and promoting transactivation in vitro, whereas missense variants located outside the high-mobility-group domain did not. Clinical manifestations and severity varied among patients. No clear genotype-phenotype correlations were found, except that missense variants outside the high-mobility-group domain were generally better tolerated., Conclusions: This study extends the clinical and genetic spectrum associated with LAMSHF and consolidates evidence that SOX5 haploinsufficiency leads to variable degrees of intellectual disability, language delay, and other clinical features.
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- 2020
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4. Diagnosis of hepatocellular adenoma in men before onset of diabetes in HNF1A-MODY: Watch out for winkers.
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Haring MPD, Vriesendorp TM, Klein Wassink-Ruiter JS, de Haas RJ, Gouw ASH, and de Meijer VE
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- Adenoma, Liver Cell diagnosis, Adult, Diabetes Mellitus, Type 2 diagnosis, Family Health, Genetic Testing, Humans, Liver Neoplasms diagnosis, Male, Mutation, Adenoma, Liver Cell genetics, Diabetes Mellitus, Type 2 genetics, Hepatocyte Nuclear Factor 1-alpha genetics, Liver Neoplasms genetics
- Abstract
Hepatocyte nuclear factor 1A (HNF1A) maturity-onset diabetes of the young (MODY) is a monogenetic, autosomal dominantly inherited form of diabetes. HNF1A-MODY is associated with HNF1A-inactivated hepatocellular adenoma (H-HCA) formation. Hepatocellular adenoma (HCA) are benign liver tumours and related complications are rare but serious: hepatic haemorrhage and malignant transformation. Guidelines recommend resection of all HCA in men and do not take any co-occurring metabolic disorders into account. We report a family with HCA preceding diabetes mellitus. Male index patient presented with numerous, irresectable HCA. After initial diagnostic and aetiologic uncertainty HNF1A germline mutation c.815G>A (p.Arg272His) was confirmed 8 years later. No HCA-related complications occurred. His diabetic mother was diagnosed with HCA after severe hepatic haemorrhage years before. HNF1A-MODY should be considered in (non-)diabetic (male) patients with H-HCA. We advocate liver biopsy and, if necessary, genetic analysis to precede any intervention for HCA in males and screening for HCA in HNF1A-MODY patients., (© 2019 The Authors. Liver International published by John Wiley & Sons Ltd.)
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- 2019
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5. Mutations in ACTL6B Cause Neurodevelopmental Deficits and Epilepsy and Lead to Loss of Dendrites in Human Neurons.
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Bell S, Rousseau J, Peng H, Aouabed Z, Priam P, Theroux JF, Jefri M, Tanti A, Wu H, Kolobova I, Silviera H, Manzano-Vargas K, Ehresmann S, Hamdan FF, Hettige N, Zhang X, Antonyan L, Nassif C, Ghaloul-Gonzalez L, Sebastian J, Vockley J, Begtrup AG, Wentzensen IM, Crunk A, Nicholls RD, Herman KC, Deignan JL, Al-Hertani W, Efthymiou S, Salpietro V, Miyake N, Makita Y, Matsumoto N, Østern R, Houge G, Hafström M, Fassi E, Houlden H, Klein Wassink-Ruiter JS, Nelson D, Goldstein A, Dabir T, van Gils J, Bourgeron T, Delorme R, Cooper GM, Martinez JE, Finnila CR, Carmant L, Lortie A, Oegema R, van Gassen K, Mehta SG, Huhle D, Abou Jamra R, Martin S, Brunner HG, Lindhout D, Au M, Graham JM Jr, Coubes C, Turecki G, Gravel S, Mechawar N, Rossignol E, Michaud JL, Lessard J, Ernst C, and Campeau PM
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- Adult, Child, Child, Preschool, Chromatin genetics, Chromatin metabolism, Dendrites metabolism, Epilepsy pathology, Female, Humans, Induced Pluripotent Stem Cells metabolism, Infant, Male, Neurodevelopmental Disorders pathology, Neurons metabolism, Young Adult, Actins genetics, Chromosomal Proteins, Non-Histone genetics, DNA-Binding Proteins genetics, Dendrites pathology, Epilepsy etiology, Induced Pluripotent Stem Cells pathology, Mutation, Neurodevelopmental Disorders etiology, Neurons pathology
- Abstract
We identified individuals with variations in ACTL6B, a component of the chromatin remodeling machinery including the BAF complex. Ten individuals harbored bi-allelic mutations and presented with global developmental delay, epileptic encephalopathy, and spasticity, and ten individuals with de novo heterozygous mutations displayed intellectual disability, ambulation deficits, severe language impairment, hypotonia, Rett-like stereotypies, and minor facial dysmorphisms (wide mouth, diastema, bulbous nose). Nine of these ten unrelated individuals had the identical de novo c.1027G>A (p.Gly343Arg) mutation. Human-derived neurons were generated that recaptured ACTL6B expression patterns in development from progenitor cell to post-mitotic neuron, validating the use of this model. Engineered knock-out of ACTL6B in wild-type human neurons resulted in profound deficits in dendrite development, a result recapitulated in two individuals with different bi-allelic mutations, and reversed on clonal genetic repair or exogenous expression of ACTL6B. Whole-transcriptome analyses and whole-genomic profiling of the BAF complex in wild-type and bi-allelic mutant ACTL6B neural progenitor cells and neurons revealed increased genomic binding of the BAF complex in ACTL6B mutants, with corresponding transcriptional changes in several genes including TPPP and FSCN1, suggesting that altered regulation of some cytoskeletal genes contribute to altered dendrite development. Assessment of bi-alleic and heterozygous ACTL6B mutations on an ACTL6B knock-out human background demonstrated that bi-allelic mutations mimic engineered deletion deficits while heterozygous mutations do not, suggesting that the former are loss of function and the latter are gain of function. These results reveal a role for ACTL6B in neurodevelopment and implicate another component of chromatin remodeling machinery in brain disease., (Copyright © 2019 American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.)
- Published
- 2019
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6. De novo variants in FBXO11 cause a syndromic form of intellectual disability with behavioral problems and dysmorphisms.
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Jansen S, van der Werf IM, Innes AM, Afenjar A, Agrawal PB, Anderson IJ, Atwal PS, van Binsbergen E, van den Boogaard MJ, Castiglia L, Coban-Akdemir ZH, van Dijck A, Doummar D, van Eerde AM, van Essen AJ, van Gassen KL, Guillen Sacoto MJ, van Haelst MM, Iossifov I, Jackson JL, Judd E, Kaiwar C, Keren B, Klee EW, Klein Wassink-Ruiter JS, Meuwissen ME, Monaghan KG, de Munnik SA, Nava C, Ockeloen CW, Pettinato R, Racher H, Rinne T, Romano C, Sanders VR, Schnur RE, Smeets EJ, Stegmann APA, Stray-Pedersen A, Sweetser DA, Terhal PA, Tveten K, VanNoy GE, de Vries PF, Waxler JL, Willing M, Pfundt R, Veltman JA, Kooy RF, Vissers LELM, and de Vries BBA
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- Gene Deletion, Humans, Syndrome, Abnormalities, Multiple genetics, Behavior, F-Box Proteins genetics, Genetic Variation, Intellectual Disability genetics, Protein-Arginine N-Methyltransferases genetics
- Abstract
Determining pathogenicity of genomic variation identified by next-generation sequencing techniques can be supported by recurrent disruptive variants in the same gene in phenotypically similar individuals. However, interpretation of novel variants in a specific gene in individuals with mild-moderate intellectual disability (ID) without recognizable syndromic features can be challenging and reverse phenotyping is often required. We describe 24 individuals with a de novo disease-causing variant in, or partial deletion of, the F-box only protein 11 gene (FBXO11, also known as VIT1 and PRMT9). FBXO11 is part of the SCF (SKP1-cullin-F-box) complex, a multi-protein E3 ubiquitin-ligase complex catalyzing the ubiquitination of proteins destined for proteasomal degradation. Twenty-two variants were identified by next-generation sequencing, comprising 2 in-frame deletions, 11 missense variants, 1 canonical splice site variant, and 8 nonsense or frameshift variants leading to a truncated protein or degraded transcript. The remaining two variants were identified by array-comparative genomic hybridization and consisted of a partial deletion of FBXO11. All individuals had borderline to severe ID and behavioral problems (autism spectrum disorder, attention-deficit/hyperactivity disorder, anxiety, aggression) were observed in most of them. The most relevant common facial features included a thin upper lip and a broad prominent space between the paramedian peaks of the upper lip. Other features were hypotonia and hyperlaxity of the joints. We show that de novo variants in FBXO11 cause a syndromic form of ID. The current series show the power of reverse phenotyping in the interpretation of novel genetic variances in individuals who initially did not appear to have a clear recognizable phenotype.
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- 2019
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7. De novo and inherited loss-of-function variants of ATP2B2 are associated with rapidly progressive hearing impairment.
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Smits JJ, Oostrik J, Beynon AJ, Kant SG, de Koning Gans PAM, Rotteveel LJC, Klein Wassink-Ruiter JS, Free RH, Maas SM, van de Kamp J, Merkus P, Koole W, Feenstra I, Admiraal RJC, Lanting CP, Schraders M, Yntema HG, Pennings RJE, and Kremer H
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- Adolescent, Adult, Aged, Child, Child, Preschool, Female, Follow-Up Studies, Heterozygote, Humans, Male, Middle Aged, Pedigree, Prognosis, Young Adult, Biomarkers analysis, Genetic Predisposition to Disease, Hearing Loss genetics, Mutation, Plasma Membrane Calcium-Transporting ATPases genetics
- Abstract
ATP2B2 encodes the PMCA2 Ca
2+ pump that plays an important role in maintaining ion homeostasis in hair cells among others by extrusion of Ca2+ from the stereocilia to the endolymph. Several mouse models have been described for this gene; mice heterozygous for loss-of-function defects display a rapidly progressive high-frequency hearing impairment. Up to now ATP2B2 has only been reported as a modifier, or in a digenic mechanism with CDH23 for hearing impairment in humans. Whole exome sequencing in hearing impaired index cases of Dutch and Polish origins revealed five novel heterozygous (predicted to be) loss-of-function variants of ATP2B2. Two variants, c.1963G>T (p.Glu655*) and c.955delG (p.Ala319fs), occurred de novo. Three variants c.397+1G>A (p.?), c.1998C>A (p.Cys666*), and c.2329C>T (p.Arg777*), were identified in families with an autosomal dominant inheritance pattern of hearing impairment. After normal newborn hearing screening, a rapidly progressive high-frequency hearing impairment was diagnosed at the age of about 3-6 years. Subjects had no balance complaints and vestibular testing did not yield abnormalities. There was no evidence for retrocochlear pathology or structural inner ear abnormalities. Although a digenic inheritance pattern of hearing impairment has been reported for heterozygous missense variants of ATP2B2 and CDH23, our findings indicate a monogenic cause of hearing impairment in cases with loss-of-function variants of ATP2B2.- Published
- 2019
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8. Gain-of-function variants in the ODC1 gene cause a syndromic neurodevelopmental disorder associated with macrocephaly, alopecia, dysmorphic features, and neuroimaging abnormalities.
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Rodan LH, Anyane-Yeboa K, Chong K, Klein Wassink-Ruiter JS, Wilson A, Smith L, Kothare SV, Rajabi F, Blaser S, Ni M, DeBerardinis RJ, Poduri A, and Berry GT
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- Adolescent, Alleles, Alopecia diagnosis, Body Dysmorphic Disorders diagnosis, Brain abnormalities, Brain diagnostic imaging, Child, Electroencephalography, Facies, Female, Genotype, Humans, Male, Megalencephaly diagnosis, Mutation, Neurodevelopmental Disorders diagnosis, Neuroimaging methods, Neuropsychological Tests, Phenotype, Polymorphism, Single Nucleotide, Alopecia genetics, Body Dysmorphic Disorders genetics, Dicarboxylic Acid Transporters genetics, Gain of Function Mutation, Megalencephaly genetics, Mitochondrial Membrane Transport Proteins genetics, Neurodevelopmental Disorders genetics
- Abstract
Polyamines serve a number of vital functions in humans, including regulation of cellular proliferation, intracellular signaling, and modulation of ion channels. Ornithine decarboxylase 1 (ODC1) is the rate-limiting enzyme in endogenous polyamine synthesis. In this report, we present four patients with a distinct neurometabolic disorder associated with de novo heterozygous, gain-of-function variants in the ODC1 gene. This disorder presents with global developmental delay, ectodermal abnormalities including alopecia, absolute or relative macrocephaly, and characteristic facial dysmorphisms. Neuroimaging variably demonstrates white matter abnormalities, prominent Virchow-Robin spaces, periventricular cysts, and abnormalities of the corpus callosum. Plasma clinical metabolomics analysis demonstrates elevation of N-acetylputrescine, the acetylated form of putrescine, with otherwise normal polyamine levels. Therapies aimed at reducing putrescine levels, including ODC1 inhibitors, dietary interventions, and antibiotics to reduce polyamine production by gastrointestinal flora could be considered as disease-modifying therapies. As the ODC1 gene has been implicated in neoplasia, cancer surveillance may be important in this disorder., (© 2018 Wiley Periodicals, Inc.)
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- 2018
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9. Cardiovascular malformations caused by NOTCH1 mutations do not keep left: data on 428 probands with left-sided CHD and their families.
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Kerstjens-Frederikse WS, van de Laar IM, Vos YJ, Verhagen JM, Berger RM, Lichtenbelt KD, Klein Wassink-Ruiter JS, van der Zwaag PA, du Marchie Sarvaas GJ, Bergman KA, Bilardo CM, Roos-Hesselink JW, Janssen JH, Frohn-Mulder IM, van Spaendonck-Zwarts KY, van Melle JP, Hofstra RM, and Wessels MW
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- Adolescent, Adult, Aged, Aorta physiopathology, Aortic Aneurysm, Thoracic genetics, Aortic Aneurysm, Thoracic physiopathology, Child, Child, Preschool, Female, Heart Defects, Congenital physiopathology, Heart Failure physiopathology, Humans, Hypoplastic Left Heart Syndrome physiopathology, Male, Middle Aged, Mutation, Pedigree, Heart Defects, Congenital genetics, Heart Failure genetics, Hypoplastic Left Heart Syndrome genetics, Receptor, Notch1 genetics
- Abstract
Purpose: We aimed to determine the prevalence and phenotypic spectrum of NOTCH1 mutations in left-sided congenital heart disease (LS-CHD). LS-CHD includes aortic valve stenosis, a bicuspid aortic valve, coarctation of the aorta, and hypoplastic left heart syndrome., Methods: NOTCH1 was screened for mutations in 428 nonsyndromic probands with LS-CHD, and family histories were obtained for all. When a mutation was detected, relatives were also tested., Results: In 148/428 patients (35%), LS-CHD was familial. Fourteen mutations (3%; 5 RNA splicing mutations, 8 truncating mutations, 1 whole-gene deletion) were detected, 11 in familial disease (11/148 (7%)) and 3 in sporadic disease (3/280 (1%)). Forty-nine additional mutation carriers were identified among the 14 families, of whom 12 (25%) were asymptomatic. Most of these mutation carriers had LS-CHD, but 9 (18%) had right-sided congenital heart disease (RS-CHD) or conotruncal heart disease (CTD). Thoracic aortic aneurysms (TAAs) occurred in 6 mutation carriers (probands included 6/63 (10%))., Conclusion: Pathogenic mutations in NOTCH1 were identified in 7% of familial LS-CHD and in 1% of sporadic LS-CHD. The penetrance is high; a cardiovascular malformation was found in 75% of NOTCH1 mutation carriers. The phenotypic spectrum includes LS-CHD, RS-CHD, CTD, and TAA. Testing NOTCH1 for an early diagnosis in LS-CHD/RS-CHD/CTD/TAA is warranted.Genet Med 18 9, 914-923.
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- 2016
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10. Disruption of POGZ Is Associated with Intellectual Disability and Autism Spectrum Disorders.
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Stessman HAF, Willemsen MH, Fenckova M, Penn O, Hoischen A, Xiong B, Wang T, Hoekzema K, Vives L, Vogel I, Brunner HG, van der Burgt I, Ockeloen CW, Schuurs-Hoeijmakers JH, Klein Wassink-Ruiter JS, Stumpel C, Stevens SJC, Vles HS, Marcelis CM, van Bokhoven H, Cantagrel V, Colleaux L, Nicouleau M, Lyonnet S, Bernier RA, Gerdts J, Coe BP, Romano C, Alberti A, Grillo L, Scuderi C, Nordenskjöld M, Kvarnung M, Guo H, Xia K, Piton A, Gerard B, Genevieve D, Delobel B, Lehalle D, Perrin L, Prieur F, Thevenon J, Gecz J, Shaw M, Pfundt R, Keren B, Jacquette A, Schenck A, Eichler EE, and Kleefstra T
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- Adolescent, Adult, Animals, Autism Spectrum Disorder diagnosis, Child, Child, Preschool, Cohort Studies, Down-Regulation, Drosophila genetics, Drosophila Proteins genetics, Drosophila Proteins metabolism, Exome, Female, Gene Knockdown Techniques, Genome-Wide Association Study, Humans, Infant, Intellectual Disability diagnosis, Language Development Disorders diagnosis, Language Development Disorders genetics, Linear Models, Male, Microcephaly diagnosis, Microcephaly genetics, Mutation, Phenotype, Transcription Factors genetics, Transcription Factors metabolism, Autism Spectrum Disorder genetics, Intellectual Disability genetics, Transposases genetics
- Abstract
Intellectual disability (ID) and autism spectrum disorders (ASD) are genetically heterogeneous, and a significant number of genes have been associated with both conditions. A few mutations in POGZ have been reported in recent exome studies; however, these studies do not provide detailed clinical information. We collected the clinical and molecular data of 25 individuals with disruptive mutations in POGZ by diagnostic whole-exome, whole-genome, or targeted sequencing of 5,223 individuals with neurodevelopmental disorders (ID primarily) or by targeted resequencing of this locus in 12,041 individuals with ASD and/or ID. The rarity of disruptive mutations among unaffected individuals (2/49,401) highlights the significance (p = 4.19 × 10(-13); odds ratio = 35.8) and penetrance (65.9%) of this genetic subtype with respect to ASD and ID. By studying the entire cohort, we defined common phenotypic features of POGZ individuals, including variable levels of developmental delay (DD) and more severe speech and language delay in comparison to the severity of motor delay and coordination issues. We also identified significant associations with vision problems, microcephaly, hyperactivity, a tendency to obesity, and feeding difficulties. Some features might be explained by the high expression of POGZ, particularly in the cerebellum and pituitary, early in fetal brain development. We conducted parallel studies in Drosophila by inducing conditional knockdown of the POGZ ortholog row, further confirming that dosage of POGZ, specifically in neurons, is essential for normal learning in a habituation paradigm. Combined, the data underscore the pathogenicity of loss-of-function mutations in POGZ and define a POGZ-related phenotype enriched in specific features., (Copyright © 2016 The American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.)
- Published
- 2016
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11. De novo mutations in NALCN cause a syndrome characterized by congenital contractures of the limbs and face, hypotonia, and developmental delay.
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Chong JX, McMillin MJ, Shively KM, Beck AE, Marvin CT, Armenteros JR, Buckingham KJ, Nkinsi NT, Boyle EA, Berry MN, Bocian M, Foulds N, Uzielli ML, Haldeman-Englert C, Hennekam RC, Kaplan P, Kline AD, Mercer CL, Nowaczyk MJ, Klein Wassink-Ruiter JS, McPherson EW, Moreno RA, Scheuerle AE, Shashi V, Stevens CA, Carey JC, Monteil A, Lory P, Tabor HK, Smith JD, Shendure J, Nickerson DA, and Bamshad MJ
- Subjects
- Arthrogryposis genetics, Craniofacial Dysostosis genetics, Cytoskeletal Proteins genetics, Cytoskeletal Proteins metabolism, Exome, Female, Gene Frequency, High-Throughput Nucleotide Sequencing, Homozygote, Humans, Infant, Ion Channels, Male, Membrane Proteins, Mutation, Missense, Sodium Channels metabolism, Contracture genetics, Extremities physiopathology, Face abnormalities, Muscle Hypotonia genetics, Sodium Channels genetics
- Abstract
Freeman-Sheldon syndrome, or distal arthrogryposis type 2A (DA2A), is an autosomal-dominant condition caused by mutations in MYH3 and characterized by multiple congenital contractures of the face and limbs and normal cognitive development. We identified a subset of five individuals who had been putatively diagnosed with "DA2A with severe neurological abnormalities" and for whom congenital contractures of the limbs and face, hypotonia, and global developmental delay had resulted in early death in three cases; this is a unique condition that we now refer to as CLIFAHDD syndrome. Exome sequencing identified missense mutations in the sodium leak channel, non-selective (NALCN) in four families affected by CLIFAHDD syndrome. We used molecular-inversion probes to screen for NALCN in a cohort of 202 distal arthrogryposis (DA)-affected individuals as well as concurrent exome sequencing of six other DA-affected individuals, thus revealing NALCN mutations in ten additional families with "atypical" forms of DA. All 14 mutations were missense variants predicted to alter amino acid residues in or near the S5 and S6 pore-forming segments of NALCN, highlighting the functional importance of these segments. In vitro functional studies demonstrated that NALCN alterations nearly abolished the expression of wild-type NALCN, suggesting that alterations that cause CLIFAHDD syndrome have a dominant-negative effect. In contrast, homozygosity for mutations in other regions of NALCN has been reported in three families affected by an autosomal-recessive condition characterized mainly by hypotonia and severe intellectual disability. Accordingly, mutations in NALCN can cause either a recessive or dominant condition characterized by varied though overlapping phenotypic features, perhaps based on the type of mutation and affected protein domain(s)., (Copyright © 2015 The American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.)
- Published
- 2015
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12. Methylmalonic acid and homocysteine assessment in the detection of vitamin B12 deficiency in patients with bilateral visual loss.
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Pott JW, Klein Wassink-Ruiter JS, and van Vliet A
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- Adult, Aged, 80 and over, Blindness etiology, Female, Humans, Male, Middle Aged, Vitamin B 12 blood, Vitamin B Complex blood, Homocysteine blood, Methylmalonic Acid blood, Vitamin B 12 Deficiency diagnosis
- Published
- 2012
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13. MYT1L is a candidate gene for intellectual disability in patients with 2p25.3 (2pter) deletions.
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Stevens SJ, van Ravenswaaij-Arts CM, Janssen JW, Klein Wassink-Ruiter JS, van Essen AJ, Dijkhuizen T, van Rheenen J, Heuts-Vijgen R, Stegmann AP, Smeets EE, and Engelen JJ
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- Abnormal Karyotype, Adolescent, Adult, Body Mass Index, Child, Child, Preschool, Chromosomes, Human, Pair 2 metabolism, DNA-Binding Proteins metabolism, Female, Haploinsufficiency, Humans, In Situ Hybridization, Fluorescence, Infant, Intellectual Disability metabolism, Male, Metaphase, Middle Aged, Neurogenesis, Obesity genetics, Oligonucleotide Array Sequence Analysis, Overweight genetics, Polymorphism, Single Nucleotide, Transcription Factors metabolism, Chromosome Deletion, Chromosomes, Human, Pair 2 genetics, DNA-Binding Proteins genetics, Intellectual Disability genetics, Transcription Factors genetics
- Abstract
A partial deletion of chromosome band 2p25.3 (2pter) is a rarely described cytogenetic aberration in patients with intellectual disability (ID). Using microarrays we identified deletions of 2p25.3, sized 0.37-3.13 Mb, in three adult siblings and three unrelated patients. All patients had ID, obesity or overweight and/or a square-shaped stature without overt facial dysmorphic features. Combining our data with phenotypic and genotypic data of three patients from the literature we defined the minimal region of overlap which contained one gene, i.e., MYT1L. MYT1L is highly transcribed in the mouse embryonic brain where its expression is restricted to postmitotic differentiating neurons. In mouse-induced pluripotent stem cell (iPS) models, MYT1L is essential for inducing functional mature neurons. These resemble excitatory cortical neurons of the forebrain, suggesting a role for MYT1L in development of cognitive functions. Furthermore, MYT1L can directly convert human fibroblasts into functional neurons in conjunction with other transcription factors. MYT1L duplication was previously reported in schizophrenia, indicating that the gene is dosage-sensitive and that shared neurodevelopmental pathways may be affected in ID and schizophrenia. Finally, deletion of MYT1, another member of the Myelin Transcription Factor family involved in neurogenesis and highly similar to MYT1L, was recently described in ID as well. The identification of MYT1L as candidate gene for ID justifies further molecular studies aimed at detecting mutations and for mechanistic studies on its role in neuron development and on neuropathogenic effects of haploinsufficiency., (Copyright © 2011 Wiley Periodicals, Inc.)
- Published
- 2011
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