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Abreu M, Branco T, Figueiroa S, Reis CF. Parental gonadossomatic mosaicism in HIVEP2-related intellectual disability and impact on genetic counseling-case report. Front Genet 2023; 14:1156847. [PMID: 37441550 PMCID: PMC10333530 DOI: 10.3389/fgene.2023.1156847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 05/19/2023] [Indexed: 07/15/2023] Open
Abstract
Intellectual development disorder, autosomal dominant 43 (MRD43) is an autosomal dominant disorder caused by heterozygous mutations in the HIVEP2 gene. In this report, we describe a case of a 4-year-old boy with global development delay, hypotonia, and dysmorphic features, in whom the finding of a heterozygous nonsense pathogenic variant in exon 5 of HIVEP2 [c.2827C>T p. (Arg943*)] through WES established a MRD43 diagnosis. Our patient's phenotype overlaps with other MRD43 descriptions in the literature. Unlike previously reported cases, where the condition was almost invariably de novo, the healthy mother in this case presented mosaicism for the pathogenic variant. Thus, the recurrence risk increased significantly from 1% to up to 50%. The description of a variant inherited for MDR43 is singular in the literature and this description highlights the importance of parental studies for accurate genetic counseling, particularly for family planning.
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Affiliation(s)
- Maria Abreu
- Medical Genetics Department, Centro de Genética Médica Jacinto de Magalhães, Centro Hospitalar Universitário do Porto, Porto, Portugal
| | - Tiago Branco
- Pediatric Department, Centro Hospitalar Tâmega e Sousa, Penafiel, Portugal
| | - Sónia Figueiroa
- Division of Pediatric Neurology, Department of Child and Adolescent, Centro Hospitalar Universitário do Porto, Porto, Portugal
| | - Cláudia Falcão Reis
- Medical Genetics Department, Centro de Genética Médica Jacinto de Magalhães, Centro Hospitalar Universitário do Porto, Porto, Portugal
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal
- ICVS/3B’s—PT Government Associate Laboratory, Braga/Guimaraes, Portugal
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Quental R, Borges JP, Santos H, Leão M. Expanding the Phenotypic Spectrum of HIVEP2-Related Intellectual Disability: Description of Two Portuguese Patients and Review of the Literature. Mol Syndromol 2022; 13:397-401. [PMID: 36588750 PMCID: PMC9801332 DOI: 10.1159/000521692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 12/27/2021] [Indexed: 01/04/2023] Open
Abstract
Introduction Pathogenic variants in HIVEP2 have been associated with a neurodevelopmental disorder mainly characterized by intellectual disability, severe language impairment, and motor developmental delay. Since its first description in 2016, only 15 patients have been described in the literature. Methods Here, we report 2 additional unrelated Portuguese children presenting intellectual disability and motor delay in whom de novo nonsense pathogenic variants in HIVEP2 have been identified by next-generation sequencing analysis. Results In patient 1, the variant c.2827C>T, p.(Arg943*) was detected, whereas patient 2 carried the variant c.6667C>T, p.(Arg2223*). Interestingly, patient 1 presented with a rapid growth of the occipitofrontal diameter in the first months of life due to external hydrocephalus, a feature that, as far as we know, has never been reported in patients with HIVEP2 pathogenic variants. Conclusion This report expands the phenotypic spectrum of this rare syndrome and provides deeper insights by comparing the clinical features of our patients with previously reported affected individuals.
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Affiliation(s)
- Rita Quental
- Department of Medical Genetics, Centro Hospitalar Universitário de São João, Porto, Portugal,*Rita Quental,
| | - Joana Pires Borges
- Paediatrics Department, Centro Hospitalar de Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal
| | - Helena Santos
- Infancy and Adolescent Neurosciences Unit, Paediatrics Department, Centro Hospitalar de Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal
| | - Miguel Leão
- Department of Medical Genetics, Centro Hospitalar Universitário de São João, Porto, Portugal
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Murphy CE, Kondo Y, Walker AK, Rothmond DA, Matsumoto M, Shannon Weickert C. Regional, cellular and species difference of two key neuroinflammatory genes implicated in schizophrenia. Brain Behav Immun 2020; 88:826-39. [PMID: 32450195 DOI: 10.1016/j.bbi.2020.05.055] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 05/20/2020] [Accepted: 05/20/2020] [Indexed: 02/07/2023] Open
Abstract
The transcription factor nuclear factor kappa B (NF-κB) regulates the expression of many inflammatory genes that are overexpressed in a subset of people with schizophrenia. Transcriptional reduction in one NF-κB inhibitor, Human Immunodeficiency Virus Enhancer Binding Protein 2 (HIVEP2), is found in the brain of patients, aligning with evidence of NF-κB over-activity. Cellular co-expression of HIVEP2 and cytokine transcripts is a prerequisite for a direct effect of HIVEP2 on pro-inflammatory transcription, and we do not know if changes in HIVEP2 and markers of neuroinflammation are occurring in the same brain cell type. We performed in situ hybridisation on postmortem dorsolateral prefrontal cortex tissue to map and compare the expression of HIVEP2 and Serpin Family A Member 3 (SERPINA3), one of the most consistently increased inflammatory genes in schizophrenia, between schizophrenia patients and controls. We find that HIVEP2 expression is neuronal and is decreased in almost all grey matter cortical layers in schizophrenia patients with neuroinflammation, and that SERPINA3 is increased in the dorsolateral prefrontal cortex grey matter and white matter in the same group of patients. We are the first to map the upregulation of SERPINA3 to astrocytes and to some neurons, and find evidence to suggest that blood vessel-associated astrocytes are the main cellular source of SERPINA3 in the schizophrenia cortex. We show that a lack of HIVEP2 in mice does not cause astrocytic upregulation of Serpina3n but does induce its transcription in neurons. We speculate that HIVEP2 downregulation is not a direct cause of astrocytic pro-inflammatory cytokine synthesis in schizophrenia but may contribute to neuronally-mediated neuroinflammation.
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Goldsmith H, Wells A, Sá MJN, Williams M, Heussler H, Buckman M, Pfundt R, de Vries BBA, Goel H. Expanding the phenotype of intellectual disability caused by HIVEP2 variants. Am J Med Genet A 2019; 179:1872-1877. [PMID: 31207095 DOI: 10.1002/ajmg.a.61271] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 04/09/2019] [Accepted: 06/01/2019] [Indexed: 01/14/2023]
Abstract
De novo pathogenic variants in the human immunodeficiency virus enhancer type I binding protein 2 (HIVEP2) gene, a large transcription factor predominantly expressed in the brain have previously been associated with intellectual disability (ID) and dysmorphic features in nine patients. We describe the phenotype and genotype of two additional patients with novel de novo pathogenic HIVEP2 variants, who have previously unreported features, including hyperphagia and Angelman-like features. Exome sequencing was utilized in the investigation of the patients who had previously incurred a rigorous genetic workup for their neurodevelopmental delay, and in whom no genetic cause had been detected. Information pertaining to phenotype and genotype for new patients was collated along with data from previous reports, showing that the phenotypic spectrum of patients with HIVEP2 variants is broader than first noted. Additional characteristics are: an increased body mass index; and features of Angelman-like syndromes including: ID, limited speech, post-natal microcephaly, and hypotonia. Dysmorphic features vary between patients. As yet, no clear association between the type of gene aberration and phenotype can be concluded. HIVEP2-related ID needs to be considered in the differential diagnosis of patients with Angelman-like phenotypes and hyperphagia, and whole-exome sequencing should be considered in the genetic diagnostic armamentarium for patients with ID of inconclusive etiology.
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Affiliation(s)
| | - Anna Wells
- University of Newcastle, Callaghan, New South Wales, Australia
| | - Maria J N Sá
- Department of Human Genetics, Radboud University Medical Center (Radboudumc), Nijmegen, The Netherlands
| | - Mark Williams
- Mater Research Institute, The University of Queensland, Woolloongabba, Queensland, Australia.,Genetic Pathology, Mater Pathology, South Brisbane, Queensland, Australia
| | - Helen Heussler
- Child Development Program, Queensland Children's Hospital, South Brisbane, Queensland, Australia.,Child Health Research Centre, The University of Queensland, South Brisbane, Queensland, Australia
| | - Melissa Buckman
- Genetic Counselling Service, Tamworth, New South Wales, Australia
| | - Rolph Pfundt
- Department of Human Genetics, Radboud University Medical Center (Radboudumc), Nijmegen, The Netherlands
| | - Bert B A de Vries
- Department of Human Genetics, Radboud University Medical Center (Radboudumc), Nijmegen, The Netherlands
| | - Himanshu Goel
- Hunter Genetics, Waratah, New South Wales, Australia.,University of Newcastle, Callaghan, New South Wales, Australia
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Park J, Colombo R, Schäferhoff K, Janiri L, Grimmel M, Sturm M, Grasshoff U, Dufke A, Haack TB, Kehrer M. Novel HIVEP2 Variants in Patients with Intellectual Disability. Mol Syndromol 2019; 10:195-201. [PMID: 31602191 DOI: 10.1159/000499060] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/12/2019] [Indexed: 12/31/2022] Open
Abstract
Intellectual disability (ID) occurs in approximately 1% of the population. Over the last years, broad sequencing approaches such as whole exome sequencing (WES) substantially contributed to the definition of the molecular defects underlying nonsyndromic ID. Pathogenic variants in HIVEP2, which encodes the human immunodeficiency virus type I enhancer binding protein 2, have recently been reported as a cause of ID, developmental delay, behavioral disorders, and dysmorphic features. HIVEP2 serves as a transcriptional factor regulating NF-ĸB and diverse genes that are essential in neural development. To date, only 8 patients with pathogenic de novo nonsense or frameshift variants and 1 patient with a pathogenic missense variant in HIVEP2 have been reported. By WES, we identified 2 novel truncating HIVEP2 variants, c.6609_6616delTGAGGGTC (p.Glu2204*) and c.6667C>T (p.Arg2223*), in 2 young adults presenting with developmental delay and mild ID without any dysmorphic features, systemic malformations, or behavioral issues.
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Affiliation(s)
- Joohyun Park
- Institute of Medical Genetics and Applied Genomics, Hertie Institute for Clinical Brain Research, Tübingen, Germany.,Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, Tübingen, Germany
| | - Roberto Colombo
- Institute of Clinical Biochemistry, Faculty of Medicine, Catholic University, Rome, Italy.,Institute of IRCCS Policlinico Gemelli, Rome, Italy
| | - Karin Schäferhoff
- Institute of Medical Genetics and Applied Genomics, Hertie Institute for Clinical Brain Research, Tübingen, Germany.,Centre for Rare Diseases, University of Tübingen, Tübingen, Germany
| | - Luigi Janiri
- Institute of Psychiatry and Psychology, Faculty of Medicine, Catholic University, Rome, Italy.,Institute of IRCCS Policlinico Gemelli, Rome, Italy
| | - Mona Grimmel
- Institute of Medical Genetics and Applied Genomics, Hertie Institute for Clinical Brain Research, Tübingen, Germany.,Centre for Rare Diseases, University of Tübingen, Tübingen, Germany
| | - Marc Sturm
- Institute of Medical Genetics and Applied Genomics, Hertie Institute for Clinical Brain Research, Tübingen, Germany
| | - Ute Grasshoff
- Institute of Medical Genetics and Applied Genomics, Hertie Institute for Clinical Brain Research, Tübingen, Germany.,Centre for Rare Diseases, University of Tübingen, Tübingen, Germany
| | - Andreas Dufke
- Institute of Medical Genetics and Applied Genomics, Hertie Institute for Clinical Brain Research, Tübingen, Germany.,Centre for Rare Diseases, University of Tübingen, Tübingen, Germany
| | - Tobias B Haack
- Institute of Medical Genetics and Applied Genomics, Hertie Institute for Clinical Brain Research, Tübingen, Germany.,Centre for Rare Diseases, University of Tübingen, Tübingen, Germany
| | - Martin Kehrer
- Institute of Medical Genetics and Applied Genomics, Hertie Institute for Clinical Brain Research, Tübingen, Germany.,Centre for Rare Diseases, University of Tübingen, Tübingen, Germany
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Steinfeld H, Cho MT, Retterer K, Person R, Schaefer GB, Danylchuk N, Malik S, Wechsler SB, Wheeler PG, van Gassen KLI, Terhal PA, Verhoeven VJM, van Slegtenhorst MA, Monaghan KG, Henderson LB, Chung WK. Mutations in HIVEP2 are associated with developmental delay, intellectual disability, and dysmorphic features. Neurogenetics 2016; 17:159-64. [PMID: 27003583 DOI: 10.1007/s10048-016-0479-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Accepted: 03/12/2016] [Indexed: 01/08/2023]
Abstract
Human immunodeficiency virus type I enhancer binding protein 2 (HIVEP2) has been previously associated with intellectual disability and developmental delay in three patients. Here, we describe six patients with developmental delay, intellectual disability, and dysmorphic features with de novo likely gene-damaging variants in HIVEP2 identified by whole-exome sequencing (WES). HIVEP2 encodes a large transcription factor that regulates various neurodevelopmental pathways. Our findings provide further evidence that pathogenic variants in HIVEP2 lead to intellectual disabilities and developmental delay.
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Affiliation(s)
- Hallie Steinfeld
- Department of Pediatrics, Columbia University Medical Center, 1150 St. Nicholas Avenue, New York, 10032, NY, USA
| | | | | | | | | | | | | | | | | | - Koen L I van Gassen
- Department of Genetics, University Medical Center Utrecht, Utrecht, 3584, The Netherlands
| | - P A Terhal
- Department of Genetics, University Medical Center Utrecht, Utrecht, 3584, The Netherlands
| | | | | | | | | | - Wendy K Chung
- Department of Pediatrics, Columbia University Medical Center, 1150 St. Nicholas Avenue, New York, 10032, NY, USA. .,Department of Medicine, Columbia University Medical Center, New York, NY, USA.
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