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Your search keyword '"Alkhunaizi, E"' showing total 4 results
Start Over Author "Alkhunaizi, E" Topic nerve tissue proteins
4 results on '"Alkhunaizi, E"'

1. Semaphorin-Plexin Signaling: From Axonal Guidance to a New X-Linked Intellectual Disability Syndrome.

Author

Steele JL, Morrow MM, Sarnat HB, Alkhunaizi E, Brandt T, Chitayat DA, DeFilippo CP, Douglas GV, Dubbs HA, Elloumi HZ, Glassford MR, Hannibal MC, Héron B, Kim LE, Marco EJ, Mignot C, Monaghan KG, Myers KA, Parikh S, Quinonez SC, Rajabi F, Shankar SP, Shinawi MS, van de Kamp JJP, Veerapandiyan A, Waldman AT, and Graf WD

Subjects
Adolescent, Adult, Autism Spectrum Disorder physiopathology, Child, Child, Preschool, Genetic Association Studies, Humans, Intellectual Disability physiopathology, Male, Signal Transduction physiology, Young Adult, Autism Spectrum Disorder genetics, Cell Adhesion Molecules physiology, Intellectual Disability genetics, Nerve Tissue Proteins physiology, Receptors, Cell Surface genetics, Semaphorins physiology
Abstract

Background: Semaphorins and plexins are ligands and cell surface receptors that regulate multiple neurodevelopmental processes such as axonal growth and guidance. PLXNA3 is a plexin gene located on the X chromosome that encodes the most widely expressed plexin receptor in fetal brain, plexin-A3. Plexin-A3 knockout mice demonstrate its role in semaphorin signaling in vivo. The clinical manifestations of semaphorin/plexin neurodevelopmental disorders have been less widely explored. This study describes the neurological and neurodevelopmental phenotypes of boys with maternally inherited hemizygous PLXNA3 variants., Methods: Data-sharing through GeneDx and GeneMatcher allowed identification of individuals with autism or intellectual disabilities (autism/ID) and hemizygous PLXNA3 variants in collaboration with their physicians and genetic counselors, who completed questionnaires about their patients. In silico analyses predicted pathogenicity for each PLXNA3 variant., Results: We assessed 14 boys (mean age, 10.7 [range 2 to 25] years) with maternally inherited hemizygous PLXNA3 variants and autism/ID ranging from mild to severe. Other findings included fine motor dyspraxia (92%), attention-deficit/hyperactivity traits, and aggressive behaviors (63%). Six patients (43%) had seizures. Thirteen boys (93%) with PLXNA3 variants showed novel or very low allele frequencies and probable damaging/disease-causing pathogenicity in one or more predictors. We found a genotype-phenotype correlation between PLXNA3 cytoplasmic domain variants (exons 22 to 32) and more severe neurodevelopmental disorder phenotypes (P < 0.05)., Conclusions: We report 14 boys with maternally inherited, hemizygous PLXNA3 variants and a range of neurodevelopmental disorders suggesting a novel X-linked intellectual disability syndrome. Greater understanding of PLXNA3 variant pathogenicity in humans will require additional clinical, computational, and experimental validation., (Copyright © 2021 The Author(s). Published by Elsevier Inc. All rights reserved.)

Published
2022
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2. Maternal SLE and brachytelephalangic chondrodysplasia punctata in a patient with unrelated de novo RAF1 and SIX2 variants.

Author

Alkhunaizi E, Unger S, Shannon P, Nishimura G, Blaser S, and Chitayat D

Subjects
Abnormalities, Multiple diagnosis, Abnormalities, Multiple pathology, Chondrodysplasia Punctata diagnosis, Chondrodysplasia Punctata pathology, Craniofacial Abnormalities diagnosis, Craniofacial Abnormalities genetics, Craniofacial Abnormalities pathology, Face abnormalities, Face pathology, Female, Genetic Predisposition to Disease, Hernia, Diaphragmatic diagnosis, Hernia, Diaphragmatic genetics, Humans, Infant, Newborn, Abnormalities, Multiple genetics, Chondrodysplasia Punctata genetics, Homeodomain Proteins genetics, Nerve Tissue Proteins genetics, Proto-Oncogene Proteins c-raf genetics
Abstract

Our improved tools to identify the aetiologies in patients with multiple abnormalities resulted in the finding that some patients have more than a single genetic condition and that some of the diagnoses made in the past are acquired rather than inherited. However, limited knowledge has been accumulated regarding the phenotypic outcome of the interaction between different genetic conditions identified in the same patients. We report a newborn girl with brachytelephalangic chondrodysplasia punctata (BCDP) as well as frontonasal dysplasia, ptosis, bilateral hearing loss, vertebral anomalies, and pulmonary hypoplasia who was found, by whole exome sequencing, to have a de novo pathogenic variant in RAF1 (c.770C>T, [p.Ser257Leu]) and a likely pathogenic variant in SIX2 (c.760G>A [p.A254T]), as well as maternal systemic lupus erythematosus (SLE). This case shows that BCDP is most probably not a diagnostic entity and can be associated with various conditions associated with CDP including maternal SLE., (© 2020 Wiley Periodicals, Inc.)

Published
2020
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3. Mutation in the ADNP gene associated with Noonan syndrome features.

Author

Alkhunaizi E, Walkiewicz MA, and Chitayat D

Subjects
Autistic Disorder physiopathology, Child, Preschool, Developmental Disabilities physiopathology, Funnel Chest genetics, Funnel Chest physiopathology, Humans, Male, Mutation, Noonan Syndrome physiopathology, Pectus Carinatum genetics, Pectus Carinatum physiopathology, Phenotype, Exome Sequencing, Autistic Disorder genetics, Developmental Disabilities genetics, Homeodomain Proteins genetics, Nerve Tissue Proteins genetics, Noonan Syndrome genetics
Published
2018
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4. Clinical Presentation of a Complex Neurodevelopmental Disorder Caused by Mutations in ADNP

Author

Dijck, A. van, Vulto-van Silfhout, A.T., Cappuyns, E., Werf, I.M. van der, Mancini, G.M., Tzschach, A., Bernier, R., Gozes, I., Eichler, E.E., Romano, C., Lindstrand, A., Nordgren, A., Kvarnung, M., Kleefstra, T., Vries, B.B.A. de, Kury, S., Rosenfeld, J.A., Meuwissen, M.E., Vandeweyer, G., Kooy, R.F., Bakshi, M., Wilson, M., Berman, Y., Dickson, R., Fransen, E., Helsmoortel, C., Ende, J. van den, Aa, N. van der, Wijdeven, M.J. van de, Rosenblum, J., Monteiro, F., Kok, F., Quercia, N., Bowdin, S., Dyment, D., Chitayat, D., Alkhunaizi, E., Boonen, S.E., Keren, B., Jacquette, A., Faivre, L., Bezieau, S., Isidor, B., Riess, A., Moog, U., Lynch, S.A., McVeigh, T., Elpeleg, O., Smeland, M.F., Fannemel, M., Haeringen, A. van, Maas, S.M., Veenstra-Knol, H.E., Schouten, M., Willemsen, M.H., Marcelis, C.L., Ockeloen, C., Burgt, I. van der, Feenstra, I., Smagt, J. van der, Jezela-Stanek, A., Krajewska-Walasek, M., Gonzalez-Lamuno, D., Anderlid, B.M., Malmgren, H., Nordenskjold, M., Clement, E., Hurst, J., Metcalfe, K., Mansour, S., Lachlan, K., Clayton-Smith, J., Hendon, L.G., Abdulrahman, O.A., Morrow, E., McMillan, C., Gerdts, J., Peeden, J., Vergano, S.A.S., Valentino, C., Chung, W.K., Ozmore, J.R., Bedrosian-Sermone, S., Dennis, A., Treat, K., Hughes, S.S., Safina, N., Pichon, J.B. le, McGuire, M., Infante, E., Madan-Khetarpal, S., Desai, S., Benke, P., Krokosky, A., Cristian, I., Baker, L., Gripp, K., Stessman, H.A., Eichenberger, J., Jayakar, P., Pizzino, A., Manning, M.A., Slattery, L., ADNP Consortium, Universidad de Cantabria, ADNP Consortium, Human Genetics, ANS - Complex Trait Genetics, and Clinical Genetics

Subjects
Male, 0301 basic medicine, Pediatrics, Autism Spectrum Disorder, Autism, Intellectual disability, Cohort Studies, Epilepsy, 0302 clinical medicine, Genotype-phenotype distinction, Neurodevelopmental disorder, Neurodevelopmental Disorder, Helsmoortel-Van der Aa syndrome, Child, ADNP, Syndrome, Hypotonia, Autism spectrum disorder, Child, Preschool, Cohort, Female, Abnormalities, medicine.symptom, Multiple, Rare cancers Radboud Institute for Health Sciences [Radboudumc 9], Adult, medicine.medical_specialty, Adolescent, Nerve Tissue Proteins, Article, Young Adult, 03 medical and health sciences, Intellectual Disability, Helsmoortel-Van der Aa Síndrome, medicine, Genetics, Humans, Abnormalities, Multiple, Preschool, Biology, Biological Psychiatry, Homeodomain Proteins, Neurodevelopmental disorders Donders Center for Medical Neuroscience [Radboudumc 7], business.industry, Infant, medicine.disease, 030104 developmental biology, Neurodevelopmental Disorders, Mutation, Human medicine, business, 030217 neurology & neurosurgery
Abstract

Background In genome-wide screening studies for de novo mutations underlying autism and intellectual disability, mutations in the ADNP gene are consistently reported among the most frequent. ADNP mutations have been identified in children with autism spectrum disorder comorbid with intellectual disability, distinctive facial features, and deficits in multiple organ systems. However, a comprehensive clinical description of the Helsmoortel-Van der Aa syndrome is lacking. Methods We identified a worldwide cohort of 78 individuals with likely disruptive mutations in ADNP from January 2014 to October 2016 through systematic literature search, by contacting collaborators, and through direct interaction with parents. Clinicians filled in a structured questionnaire on genetic and clinical findings to enable correlations between genotype and phenotype. Clinical photographs and specialist reports were gathered. Parents were interviewed to complement the written questionnaires. Results We report on the detailed clinical characterization of a large cohort of individuals with an ADNP mutation and demonstrate a distinctive combination of clinical features, including mild to severe intellectual disability, autism, severe speech and motor delay, and common facial characteristics. Brain abnormalities, behavioral problems, sleep disturbance, epilepsy, hypotonia, visual problems, congenital heart defects, gastrointestinal problems, short stature, and hormonal deficiencies are common comorbidities. Strikingly, individuals with the recurrent p.Tyr719* mutation were more severely affected. Conclusions This overview defines the full clinical spectrum of individuals with ADNP mutations, a specific autism subtype. We show that individuals with mutations in ADNP have many overlapping clinical features that are distinctive from those of other autism and/or intellectual disability syndromes. In addition, our data show preliminary evidence of a correlation between genotype and phenotype. This work was supported by grants from the European Research Area Networks Network of European Funding for Neuroscience Research through the Research Foundation–Flanders and the Chief Scientist Office–Ministry of Health (to RFK, GV, IG). This research was supported, in part, by grants from the Simons Foundation Autism Research Initiative (Grant No. SFARI 303241 to EEE) and National Institutes of Health (Grant No. R01MH101221 to EEE). This work was also supported by the Italian Ministry of Health and ‘5 per mille’ funding (to CR). For many individuals, sequencing was provided by research initiatives like the Care4Rare Research Consortium in Canada or the Deciphering Developmental Disorders (DDD) study in the UK. The DDD Study presents independent research commissioned by the Health Innovation Challenge Fund (Grant No. HICF-1009–003), a parallel funding partnership between the Wellcome Trust and the Department of Health, and the Wellcome Trust Sanger Institute (Grant No. WT098051). The views expressed in this publication are those of the author(s) and not necessarily those of the Wellcome Trust or the Department of Health. The study has UK Research Ethics Committee approval (10/H0305/83, granted by the Cambridge South Research Ethics Committee, and GEN/284/12 granted by the Republic of Ireland Research Ethics Committee). The research team acknowledges the support of the National Institute for Health Research, through the Comprehensive Clinical Research Network.

Published
2019

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