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Bhatia M, Cavalleri GL, White M, Delanty N, Sweeney BJ, Costello DJ, Greally MT, Benson KA. Germline mosaicism in a family with MBD5 haploinsufficiency. Cold Spring Harb Mol Case Stud 2022; 8:mcs.a006253. [PMID: 36396431 PMCID: PMC9808559 DOI: 10.1101/mcs.a006253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 11/16/2022] [Indexed: 11/18/2022] Open
Abstract
Haploinsufficiency of the methyl-CpG-binding domain protein 5 (MBD5) gene causes a neurodevelopmental disorder that includes intellectual disability, developmental delay, speech impairment, seizures, sleep disturbances, and behavioral difficulties. Microdeletion of 2q23.1 is the most common cause of haploinsufficiency, although MBD5 haploinsufficiency may also cause this genetic disorder. We report a family harboring a heterozygous loss-of-function variant in MBD5 (NM_018328.5:c.728delC; p.Pro243Hisfs*26), which includes three affected siblings with varying phenotypic features. Both parents were phenotypically normal but deep coverage sequencing of the parents showed germline mosaicism in the mother.
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Affiliation(s)
- Mehak Bhatia
- School of Medicine, Royal College of Surgeons in Ireland, Dublin, DO2 VN51, Ireland
| | - Gianpiero L. Cavalleri
- School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, DO2 VN51, Ireland;,FutureNeuro Research Centre, Dublin, DO2 VN51, Ireland
| | - Máire White
- FutureNeuro Research Centre, Dublin, DO2 VN51, Ireland
| | - Norman Delanty
- School of Medicine, Royal College of Surgeons in Ireland, Dublin, DO2 VN51, Ireland;,FutureNeuro Research Centre, Dublin, DO2 VN51, Ireland;,Department of Neurology, Beaumont Hospital, Dublin, DO9 DK19, Ireland
| | - Brian J. Sweeney
- Epilepsy Service, Cork University Hospital and College of Medicine and Health, University Hospital Cork, Cork, T12 YE02, Ireland
| | - Daniel J. Costello
- Epilepsy Service, Cork University Hospital and College of Medicine and Health, University Hospital Cork, Cork, T12 YE02, Ireland
| | - Marie T. Greally
- School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, DO2 VN51, Ireland;,FutureNeuro Research Centre, Dublin, DO2 VN51, Ireland;,Department of Clinical Genetics, Children's Health Ireland at Crumlin, Dublin D12 N512, Ireland
| | - Katherine A. Benson
- School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, DO2 VN51, Ireland;,FutureNeuro Research Centre, Dublin, DO2 VN51, Ireland
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2
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Das D, Podder S. Deregulation of ceRNA Networks in Frontal Cortex and Choroid Plexus of Brain during SARS-CoV-2 Infection Aggravates Neurological Manifestations: An Insight from Bulk and Single-Cell Transcriptomic Analyses. Adv Biol (Weinh) 2022; 6:e2101310. [PMID: 35661455 PMCID: PMC9348399 DOI: 10.1002/adbi.202101310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 05/20/2022] [Indexed: 01/28/2023]
Abstract
Although transcriptomic studies of SARS-CoV-2-infected brains have depicted variability in gene expression, the landscape of deregulated cell-specific regulatory circuits has not been elucidated yet. Hence, bulk and single-cell RNA-seq data are analyzed to gain detailed insights. Initially, two ceRNA networks with 19 and 3 differentially expressed (DE) hub lncRNAs are reconstructed in SARS-CoV-2 infected Frontal Cortex (FC) and Choroid Plexus (CP), respectively. Functional and pathway enrichment analyses of downstream mRNAs of deregulated ceRNA axes demonstrate impairment of neurological processes. Mapping of hub lncRNA-mRNA pairs from bulk RNA-seq with snRNA-seq data has indicated that NORAD, NEAT1, and STXBP5-AS1 are downregulated across 4, 4, and 2 FC cell types, respectively. At the same time, MIRLET7BHG and MALAT1 are upregulated in excitatory neurons of FC and neurons of CP, respectively. Here, it is hypothesized that downregulation of NORAD, NEAT1, and STXBP5-AS1, and upregulation of MIRLET7BHG and MALAT1 might deregulate respectively 51, 6, and 37, and 31 and 19 mRNAs in cell types of FC and CP. Afterward, 13 therapeutic miRNAs are traced that might safeguard against deregulated lncRNA-mRNA pairs of NORAD, NEAT1, and MIRLET7BHG in FC. This study helps to explain the plausible mechanism of post-COVID neurological manifestation and also to devise therapeutics against it.
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Affiliation(s)
- Deepyaman Das
- Department of MicrobiologyRaiganj UniversityRaiganjUttar DinajpurWest Bengal733134India
| | - Soumita Podder
- Department of MicrobiologyRaiganj UniversityRaiganjUttar DinajpurWest Bengal733134India
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3
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González-Ortega G, Llamas-Velasco S, Arteche-López A, Quesada-Espinosa JF, Puertas-Martín V, Gómez-Grande A, López-Álvarez J, Saiz Díaz RA, Lezana-Rosales JM, Villarejo-Galende A, González de la Aleja J. Early-Onset Dementia Associated with a Heterozygous, Nonsense, and de novo Variant in the MBD5 Gene. J Alzheimers Dis 2021; 84:73-78. [PMID: 34459404 DOI: 10.3233/jad-210648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The haploinsufficiency of the methyl-binding domain protein 5 (MBD5) gene has been identified as the determinant cause of the neuropsychiatric disorders grouped under the name MBD5-neurodevelopment disorders (MAND). MAND includes patients with intellectual disability, behavioral problems, and seizures with a static clinical course. However, a few reports have suggested regression. We describe a non-intellectually disabled female, with previous epilepsy and personality disorder, who developed early-onset dementia. The extensive etiologic study revealed a heterozygous nonsense de novo pathogenic variant in the MBD5 gene. This finding could support including the MBD5 gene in the study of patients with atypical early-onset dementia.
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Affiliation(s)
| | - Sara Llamas-Velasco
- Department of Neurology, Hospital Universitario 12 de Octubre, Madrid, Spain.,Group of Neurodegenerative Diseases, Instituto de Investigación Hospital 12 de Octubre (I+12), Madrid, Spain.,Biomedical Research Networking Center in Neurodegenerative diseases CIBERNED, Madrid, Spain
| | - Ana Arteche-López
- Department of Genetics, Hospital Universitario 12 de Octubre, Madrid, Spain
| | | | - Verónica Puertas-Martín
- Department of Neurology, Hospital Universitario 12 de Octubre, Madrid, Spain.,Universidad Internacional de La Rioja (UNIR), Logroño, Spain
| | - Adolfo Gómez-Grande
- Department of Nuclear Medicine, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Jorge López-Álvarez
- Department of Psychiatry, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Rosa Ana Saiz Díaz
- Department of Neurology, Hospital Universitario 12 de Octubre, Madrid, Spain.,Department of Medicine, School of Medicine, Complutense University, Madrid, Spain.,Epilepsy-EEG Unit, Hospital Universitario 12 de Octubre, Madrid, Spain
| | | | - Alberto Villarejo-Galende
- Department of Neurology, Hospital Universitario 12 de Octubre, Madrid, Spain.,Group of Neurodegenerative Diseases, Instituto de Investigación Hospital 12 de Octubre (I+12), Madrid, Spain.,Biomedical Research Networking Center in Neurodegenerative diseases CIBERNED, Madrid, Spain.,Department of Medicine, School of Medicine, Complutense University, Madrid, Spain
| | - Jesús González de la Aleja
- Department of Neurology, Hospital Universitario 12 de Octubre, Madrid, Spain.,Epilepsy-EEG Unit, Hospital Universitario 12 de Octubre, Madrid, Spain
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4
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Orrico A, Galli L, Rossi M, Cortesi A, Mazzi M, Caterino E. The Variable Expression of a Novel MBD5 Gene Frameshift Mutation in an Italian Family. Neuropediatrics 2021; 52:138-141. [PMID: 33374027 DOI: 10.1055/s-0040-1715633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Haploinsufficiency of the methyl-CpG-binding domain protein 5 (MBD5) gene is reported as a cause of an autosomal dominant type of cognitive disability (MRD1) and autism spectrum disorder through large deletions involving multiple genes or point mutations, ultimately leading to haploinsufficiency in both cases. However, relatively few reports have been published on the phenotypical spectrum resulting from point mutations.We report here on a novel heterozygous frameshift variant in the MBD5 gene [c.2579del; p.(Lys860Argfs*11)] in a family in which the typical signs associated with pathogenic variants were expressed with different degrees of severity in the clinical presentation of the carrier individuals.Our findings, adding a novel mutation to the mutational spectrum, further support the relevance of the MBD5 gene as one of the main molecular mechanisms involved in the pathogenesis of intellectual disability and contribute to the characterization of the genotype-phenotype correlations.
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Affiliation(s)
- Alfredo Orrico
- Inter-departmental Program for Molecular Diagnosis and Characterization of Pathogenic Mechanisms of Rare Genetic Diseases, Azienda Ospedaliero Universitaria Senese, Siena, Italy.,Clinical Genetics, ASL Toscana Sudest, Ospedale della Misericordia, Grosseto, Italy
| | - Lucia Galli
- Clinical Genetics, ASL Toscana Sudest, Ospedale della Misericordia, Grosseto, Italy.,Inter-departmental Program for Molecular Diagnosis and Characterization of Pathogenic Mechanisms of Rare Genetic Diseases, Azienda Ospedaliero Universitaria Senese, Siena, Italy
| | - Maja Rossi
- Molecular Diagnostic Laboratory, ASL Toscana Sudest, Ospedale della Misericordia, Grosseto, Italy
| | - Ambra Cortesi
- Molecular Diagnostic Laboratory, ASL Toscana Sudest, Ospedale della Misericordia, Grosseto, Italy
| | - Marta Mazzi
- Pathophysiology of Human Reproduction, ASL Toscana Sudest, Ospedale della Misericordia, Grosseto, Italy
| | - Ettore Caterino
- Neuropsychiatry Unit, ASL Toscana Sudest, UFSMIA Zona Amiata Grossetana, Grosseto, Italy
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5
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Le TNU, Ha TMT. MBD5-related intellectual disability in a Vietnamese child. Am J Med Genet A 2021; 185:1321-1323. [PMID: 33427406 DOI: 10.1002/ajmg.a.62077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 11/17/2020] [Accepted: 12/26/2020] [Indexed: 11/11/2022]
Abstract
The disruption of methyl-binding domain protein 5 (MBD5) gene has been determined as a significant cause of a group of disorders known as MBD5-associated neurodevelopmental disorder. Here, we report a novel pathogenic mutation, NM_001378120.1 (MBD5): c.217-1G>C, occurring at the acceptor splicing site of intron 6 of the MBD5 gene identified in a Vietnamese child with intellectual disability, autistic-like behaviors, and seizure. Phenotypic manifestations in this patient are highlighted with neurodevelopmental impairments whereas his facial dysmorphism is unremarkable. Our finding has enriched the understanding of the spectrum of MBD5 variants, a critical database for diagnosis, genetic counseling, and management of the patients with neurological diseases.
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Affiliation(s)
- Thanh Nha Uyen Le
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam.,Institute of Biomedicine, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Thi Minh Thi Ha
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam.,Institute of Biomedicine, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam.,Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue, Vietnam
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6
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Kolevzon A, Delaby E, Berry-Kravis E, Buxbaum JD, Betancur C. Neuropsychiatric decompensation in adolescents and adults with Phelan-McDermid syndrome: a systematic review of the literature. Mol Autism 2019; 10:50. [PMID: 31879555 PMCID: PMC6930682 DOI: 10.1186/s13229-019-0291-3] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Accepted: 10/09/2019] [Indexed: 12/22/2022] Open
Abstract
Phelan-McDermid syndrome (PMS) is caused by haploinsufficiency of the SHANK3 gene on chromosome 22q13.33 and is characterized by intellectual disability, hypotonia, severe speech impairments, and autism spectrum disorder. Emerging evidence indicates that there are changes over time in the phenotype observed in individuals with PMS, including severe neuropsychiatric symptoms and loss of skills occurring in adolescence and adulthood. To gain further insight into these phenomena and to better understand the long-term course of the disorder, we conducted a systematic literature review and identified 56 PMS cases showing signs of behavioral and neurologic decompensation in adolescence or adulthood (30 females, 25 males, 1 gender unknown). Clinical presentations included features of bipolar disorder, catatonia, psychosis, and loss of skills, occurring at a mean age of 20 years. There were no apparent sex differences in the rates of these disorders except for catatonia, which appeared to be more frequent in females (13 females, 3 males). Reports of individuals with point mutations in SHANK3 exhibiting neuropsychiatric decompensation and loss of skills demonstrate that loss of one copy of SHANK3 is sufficient to cause these manifestations. In the majority of cases, no apparent cause could be identified; in others, symptoms appeared after acute events, such as infections, prolonged or particularly intense seizures, or changes in the individual's environment. Several individuals had a progressive neurological deterioration, including one with juvenile onset metachromatic leukodystrophy, a severe demyelinating disorder caused by recessive mutations in the ARSA gene in 22q13.33. These reports provide insights into treatment options that have proven helpful in some cases, and are reviewed herein. Our survey highlights how little is currently known about neuropsychiatric presentations and loss of skills in PMS and underscores the importance of studying the natural history in individuals with PMS, including both cross-sectional and long-term longitudinal analyses. Clearer delineation of these neuropsychiatric symptoms will contribute to their recognition and prompt management and will also help uncover the underlying biological mechanisms, potentially leading to improved interventions.
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Affiliation(s)
- Alexander Kolevzon
- Seaver Autism Center for Research and Treatment, Icahn School of Medicine at Mount Sinai, New York, NY USA
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY USA
- Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY USA
- Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY USA
| | - Elsa Delaby
- Sorbonne Université, INSERM, CNRS, Neuroscience Paris Seine, Institut de Biologie Paris Seine, Paris, France
| | - Elizabeth Berry-Kravis
- Department of Pediatrics, Neurological Sciences, Biochemistry, Rush University Medical Center, Chicago, Illinois USA
| | - Joseph D. Buxbaum
- Seaver Autism Center for Research and Treatment, Icahn School of Medicine at Mount Sinai, New York, NY USA
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY USA
- Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY USA
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY USA
- Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY USA
| | - Catalina Betancur
- Sorbonne Université, INSERM, CNRS, Neuroscience Paris Seine, Institut de Biologie Paris Seine, Paris, France
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7
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Verhoeven W, Egger J, Kipp J, Verheul-Aan de Wiel J, Ockeloen C, Kleefstra T, Pfundt R. A novel MBD5 mutation in an intellectually disabled adult female patient with epilepsy: Suggestive of early onset dementia? Mol Genet Genomic Med 2019; 7:e849. [PMID: 31290275 PMCID: PMC6687664 DOI: 10.1002/mgg3.849] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2019] [Revised: 05/27/2019] [Accepted: 06/05/2019] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND The minimal critical region in 2q23.1 deletion syndrome comprises one gene only, that is, the methyl-CpG-binding domain protein 5 (MBD5) gene. Since the phenotypes of patients with deletions, duplications or pathogenic variants of MBD5 show considerable overlap, the term MBD5-associated neurodevelopmental disorder (MAND) was proposed. These syndromes are characterized by intellectual disability, seizures of any kind and symptoms from the autism spectrum. In a very limited number of patients, MAND may be associated with regression starting either at early infancy or at midlife. METHODS The present paper describes a severely intellectually disabled autistic female with therapy resistant complex partial epilepsy starting at her 16the with gradual cognitive and behavioral regression towards her sixth decade. RESULTS Cognitive and behavioral regression occurred towards the patient's sixth decade. Exome sequencing disclosed a novel heterozygous pathogenic frameshift mutation of MBD5 that was considered to be causative for the combination of intellectual disability, treatment-resistant epilepsy and autism. CONCLUSION The presented patient is the second with a pathogenic MBD5 mutation in whom the course of disease is suggestive of early onset dementia starting in her fifth decade. These findings stress the importance of exome sequencing, also in elderly intellectually disabled patients, particularly in those with autism.
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Affiliation(s)
- Willem Verhoeven
- Centre of Excellence for Neuropsychiatry, Vincent van Gogh Institute for Psychiatry, Venray, the Netherlands.,Department of Psychiatry, Erasmus University Medical Centre, Rotterdam, the Netherlands
| | - Jos Egger
- Centre of Excellence for Neuropsychiatry, Vincent van Gogh Institute for Psychiatry, Venray, the Netherlands.,Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, the Netherlands.,Stevig Specialized and Forensic Care for People with Intellectual Disabilities, Dichterbij, Oostrum, the Netherlands
| | - Janneke Kipp
- ASVZ Institutes for Intellectual Disabilities, Leerdam, the Netherlands
| | | | - Charlotte Ockeloen
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Tjitske Kleefstra
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Rolph Pfundt
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, the Netherlands
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