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Farcy S, Hachour H, Bahi-Buisson N, Passemard S. Genetic Primary Microcephalies: When Centrosome Dysfunction Dictates Brain and Body Size. Cells 2023; 12:1807. [PMID: 37443841 PMCID: PMC10340463 DOI: 10.3390/cells12131807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 06/04/2023] [Accepted: 06/13/2023] [Indexed: 07/15/2023] Open
Abstract
Primary microcephalies (PMs) are defects in brain growth that are detectable at or before birth and are responsible for neurodevelopmental disorders. Most are caused by biallelic or, more rarely, dominant mutations in one of the likely hundreds of genes encoding PM proteins, i.e., ubiquitous centrosome or microtubule-associated proteins required for the division of neural progenitor cells in the embryonic brain. Here, we provide an overview of the different types of PMs, i.e., isolated PMs with or without malformations of cortical development and PMs associated with short stature (microcephalic dwarfism) or sensorineural disorders. We present an overview of the genetic, developmental, neurological, and cognitive aspects characterizing the most representative PMs. The analysis of phenotypic similarities and differences among patients has led scientists to elucidate the roles of these PM proteins in humans. Phenotypic similarities indicate possible redundant functions of a few of these proteins, such as ASPM and WDR62, which play roles only in determining brain size and structure. However, the protein pericentrin (PCNT) is equally required for determining brain and body size. Other PM proteins perform both functions, albeit to different degrees. Finally, by comparing phenotypes, we considered the interrelationships among these proteins.
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Affiliation(s)
- Sarah Farcy
- UMR144, Institut Curie, 75005 Paris, France;
- Inserm UMR-S 1163, Institut Imagine, 75015 Paris, France
| | - Hassina Hachour
- Service de Neurologie Pédiatrique, DMU INOV-RDB, APHP, Hôpital Robert Debré, 75019 Paris, France;
| | - Nadia Bahi-Buisson
- Service de Neurologie Pédiatrique, DMU MICADO, APHP, Hôpital Necker Enfants Malades, 75015 Paris, France;
- Université Paris Cité, Inserm UMR-S 1163, Institut Imagine, 75015 Paris, France
| | - Sandrine Passemard
- Service de Neurologie Pédiatrique, DMU INOV-RDB, APHP, Hôpital Robert Debré, 75019 Paris, France;
- Université Paris Cité, Inserm UMR 1141, NeuroDiderot, 75019 Paris, France
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2
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Mudassir BU, Agha Z. Microcephaly, Short Stature, Intellectual Disability, Speech Absence and Cataract Are Associated with Novel Bi-Allelic Missense Variant in RTTN Gene: A Seckel Syndrome Case Report. CHILDREN (BASEL, SWITZERLAND) 2023; 10:1027. [PMID: 37371259 DOI: 10.3390/children10061027] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 05/28/2023] [Accepted: 05/31/2023] [Indexed: 06/29/2023]
Abstract
The RTTN gene encodes centriole biogenesis, replication, symmetry and cohesion, basal body organization and has recently been associated with the appearance of microcephaly syndromes. RTTN-related neurological defects including microcephaly, intellectual disability, congenital dwarfism, ophthalmic manifestations, and epilepsy are mainly due to abnormal brain development pathways and loss-of-function protein mutations. We present a consanguineous Pakistani family clinically suspected of Seckel syndrome with severe microcephaly, severe intellectual disability, short stature, absence of speech, pointed nose, narrow face and bilateral cataract in two siblings residing in the suburbs of Islamabad. Forty cases of Seckel syndrome have been reported to date in the literature due to mutations in the ATR, TRAIP, RBBP8, NSMCE2, NIN, CENPJ, DNA2, CEP152 and CEP63 genes. The objective of the study was to perform a clinical diagnosis, genetic analysis, and pathophysiology of Seckel syndrome in the proband. Whole-exome sequencing discovered NM_173630.4: c.57G > T(pGlu19Asp) missense variant in exon 2 of the RTTN gene that co-segregates in the family. This novel variant, to the best of our knowledge, is pathogenic and with autosomal recessive inheritance expressed as Seckel syndrome in the affected members of the family. The present study has expanded the genetic knowledge of novel RTTN gene variants associated with Seckel syndrome and has broadened its phenotype spectrum in the Pakistani population, which comprises diverse ethnicities. We hope that our study will open new horizons for individual molecular diagnosis and therapeutics to improve the life of patients with this congenital syndrome.
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Affiliation(s)
- Behjat Ul Mudassir
- Translational Genomics Laboratory, Department of Biosciences, COMSATS University, Islamabad 45550, Pakistan
| | - Zehra Agha
- Translational Genomics Laboratory, Department of Biosciences, COMSATS University, Islamabad 45550, Pakistan
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3
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Association of Meier-Gorlin and microcephalic osteodysplastic primordial dwarfism type II clinical features in an individual with CDK5RAP2 primary microcephaly. Eur J Med Genet 2023; 66:104733. [PMID: 36842471 DOI: 10.1016/j.ejmg.2023.104733] [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: 11/24/2022] [Revised: 01/27/2023] [Accepted: 02/22/2023] [Indexed: 02/26/2023]
Abstract
Autosomal recessive primary microcephaly type 3 (MCPH3) caused by pathogenic variations in CDK5RAP2, is characterized by sensorineural hearing loss, abnormality of skin pigmentation, ocular defects and severe microcephaly associated with neurodevelopmental delay. In this study, we expand the phenotype of MCPH3 as we describe a 10-year-old girl with a biallelic exonic frameshift variant in CDK5RAP2 displaying previously unreported features usually associated with Meier-Gorlin and microcephalic osteodysplastic primordial dwarfism type II (MOPDII). We further describe the clinical phenotype of this form of centrosomal-based primary microcephaly and emphasize the importance of skeletal defect screening in affected individuals.
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Asif M, Abdullah U, Nürnberg P, Tinschert S, Hussain MS. Congenital Microcephaly: A Debate on Diagnostic Challenges and Etiological Paradigm of the Shift from Isolated/Non-Syndromic to Syndromic Microcephaly. Cells 2023; 12:cells12040642. [PMID: 36831309 PMCID: PMC9954724 DOI: 10.3390/cells12040642] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Revised: 02/13/2023] [Accepted: 02/14/2023] [Indexed: 02/19/2023] Open
Abstract
Congenital microcephaly (CM) exhibits broad clinical and genetic heterogeneity and is thus categorized into several subtypes. However, the recent bloom of disease-gene discoveries has revealed more overlaps than differences in the underlying genetic architecture for these clinical sub-categories, complicating the differential diagnosis. Moreover, the mechanism of the paradigm shift from a brain-restricted to a multi-organ phenotype is only vaguely understood. This review article highlights the critical factors considered while defining CM subtypes. It also presents possible arguments on long-standing questions of the brain-specific nature of CM caused by a dysfunction of the ubiquitously expressed proteins. We argue that brain-specific splicing events and organ-restricted protein expression may contribute in part to disparate clinical manifestations. We also highlight the role of genetic modifiers and de novo variants in the multi-organ phenotype of CM and emphasize their consideration in molecular characterization. This review thus attempts to expand our understanding of the phenotypic and etiological variability in CM and invites the development of more comprehensive guidelines.
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Affiliation(s)
- Maria Asif
- Cologne Center for Genomics (CCG), Faculty of Medicine, University Hospital Cologne, University of Cologne, 50931 Cologne, Germany
- Center for Molecular Medicine Cologne (CMMC), Faculty of Medicine, University Hospital Cologne, University of Cologne, 50931 Cologne, Germany
| | - Uzma Abdullah
- University Institute of Biochemistry and Biotechnology (UIBB), PMAS-Arid Agriculture University, Rawalpindi, Rawalpindi 46300, Pakistan
| | - Peter Nürnberg
- Cologne Center for Genomics (CCG), Faculty of Medicine, University Hospital Cologne, University of Cologne, 50931 Cologne, Germany
- Center for Molecular Medicine Cologne (CMMC), Faculty of Medicine, University Hospital Cologne, University of Cologne, 50931 Cologne, Germany
| | - Sigrid Tinschert
- Zentrum Medizinische Genetik, Medizinische Universität, 6020 Innsbruck, Austria
| | - Muhammad Sajid Hussain
- Cologne Center for Genomics (CCG), Faculty of Medicine, University Hospital Cologne, University of Cologne, 50931 Cologne, Germany
- Center for Molecular Medicine Cologne (CMMC), Faculty of Medicine, University Hospital Cologne, University of Cologne, 50931 Cologne, Germany
- Correspondence:
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Chohra I, Chung K, Giri S, Malgrange B. ATP-Dependent Chromatin Remodellers in Inner Ear Development. Cells 2023; 12:cells12040532. [PMID: 36831199 PMCID: PMC9954591 DOI: 10.3390/cells12040532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 01/30/2023] [Accepted: 02/01/2023] [Indexed: 02/11/2023] Open
Abstract
During transcription, DNA replication and repair, chromatin structure is constantly modified to reveal specific genetic regions and allow access to DNA-interacting enzymes. ATP-dependent chromatin remodelling complexes use the energy of ATP hydrolysis to modify chromatin architecture by repositioning and rearranging nucleosomes. These complexes are defined by a conserved SNF2-like, catalytic ATPase subunit and are divided into four families: CHD, SWI/SNF, ISWI and INO80. ATP-dependent chromatin remodellers are crucial in regulating development and stem cell biology in numerous organs, including the inner ear. In addition, mutations in genes coding for proteins that are part of chromatin remodellers have been implicated in numerous cases of neurosensory deafness. In this review, we describe the composition, structure and functional activity of these complexes and discuss how they contribute to hearing and neurosensory deafness.
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Ruaud L, Drunat S, Elmaleh-Bergès M, Ernault A, Guilmin Crepon S, El Ghouzzi V, Auvin S, Verloes A, Passemard S, Engel C, Altuzarra C, Lamidieu C, Bayat A, Moortgat S, Pelc K, Maystadt I, Abramowicz M, Pirson I, Duerinckx S, Rostomashvili N, Zweier C, Abou Jamra R, Lorenz I, Haye D, Zaafrane‐Khachnaoui K, Vaessen S, Capri Y, Servais L, Di Maria E, Kohlhase J, Bast T, Miladi N, Dali S. Neurological outcome in WDR62 primary microcephaly. Dev Med Child Neurol 2022; 64:509-517. [PMID: 35726608 DOI: 10.1111/dmcn.15060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 07/31/2021] [Accepted: 08/02/2021] [Indexed: 01/15/2023]
Abstract
AIM To characterize the cortical structure, developmental, and cognitive profiles of patients with WD repeat domain 62 (WDR62)-related primary microcephaly. METHOD In this observational study, we describe the developmental, neurological, cognitive, and brain imaging characteristics of 17 patients (six males, 11 females; mean age 12y 3mo standard deviation [SD] 5y 8mo, range 5y-24y 6mo) and identify 14 new variants of WDR62. We similarly analyse the phenotypes and genotypes of the 59 previously reported families. RESULTS Brain malformations, including pachygyria, neuronal heterotopia, schizencephaly, and microlissencephaly, were present in 11 out of 15 patients. The mean full-scale IQ of the 11 assessed patients was 51.8 (standard deviation [SD] 12.6, range 40-70). Intellectual disability was severe in four patients, moderate in four, and mild in three. Scores on the Vineland Adaptive Behavior Scales obtained from 10 patients were low for communication and motor skills (mean 38.29, SD 7.74, and 37.71, SD 5.74 respectively). The socialization score was higher (mean 47.14, SD 12.39). We found a significant difference between scores for communication and daily living skills (mean 54.43, SD 11.6; p=0.001, one-way analysis of variance). One patient displayed progressive ataxia. INTERPRETATION WDR62-related cognitive consequences may be less severe than expected because 3 out of 11 of the assessed patients had only mild intellectual disability and relatively preserved abilities of autonomy in daily life. We identified progressive ataxia in the second decade of life in one patient, which should encourage clinicians to follow up patients in the long term.
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Affiliation(s)
- Lyse Ruaud
- Département de Génétique, UMR 1141 NEURODIDEROT, INSERM, APHP, Hôpital Universitaire Robert Debré, Université de Paris, Paris, France
| | - Séverine Drunat
- Département de Génétique, UMR 1141 NEURODIDEROT, INSERM, APHP, Hôpital Universitaire Robert Debré, Université de Paris, Paris, France
| | | | - Anais Ernault
- Département de Génétique, APHP, Hôpital Universitaire Robert Debré, Paris, France
| | - Sophie Guilmin Crepon
- Unité d'Epidémiologie Clinique, APHP, Hôpital Universitaire Robert Debré, Paris, France
| | | | | | - Stéphane Auvin
- Service de Neurologie Pédiatrique, UMR 1141 NEURODIDEROT, INSERM, APHP, Hôpital Universitaire Robert Debré, Université de Paris, Paris, France.,Institut universitaire de France (IUF), Paris, France
| | - Alain Verloes
- Département de Génétique, UMR 1141 NEURODIDEROT, INSERM, APHP, Hôpital Universitaire Robert Debré, Université de Paris, Paris, France
| | - Sandrine Passemard
- Service de Neurologie Pédiatrique, UMR 1141 NEURODIDEROT, INSERM, APHP, Hôpital Universitaire Robert Debré, Université de Paris, Paris, France
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7
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Zaqout S, Kaindl AM. Autosomal Recessive Primary Microcephaly: Not Just a Small Brain. Front Cell Dev Biol 2022; 9:784700. [PMID: 35111754 PMCID: PMC8802810 DOI: 10.3389/fcell.2021.784700] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 12/01/2021] [Indexed: 02/06/2023] Open
Abstract
Microcephaly or reduced head circumference results from a multitude of abnormal developmental processes affecting brain growth and/or leading to brain atrophy. Autosomal recessive primary microcephaly (MCPH) is the prototype of isolated primary (congenital) microcephaly, affecting predominantly the cerebral cortex. For MCPH, an accelerating number of mutated genes emerge annually, and they are involved in crucial steps of neurogenesis. In this review article, we provide a deeper look into the microcephalic MCPH brain. We explore cytoarchitecture focusing on the cerebral cortex and discuss diverse processes occurring at the level of neural progenitors, early generated and mature neurons, and glial cells. We aim to thereby give an overview of current knowledge in MCPH phenotype and normal brain growth.
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Affiliation(s)
- Sami Zaqout
- Department of Basic Medical Sciences, College of Medicine, QU Health, Qatar University, Doha, Qatar
- Biomedical and Pharmaceutical Research Unit, QU Health, Qatar University, Doha, Qatar
| | - Angela M. Kaindl
- Institute of Cell and Neurobiology, Charité—Universitätsmedizin Berlin, Berlin, Germany
- Center for Chronically Sick Children (Sozialpädiatrisches Zentrum, SPZ), Charité—Universitätsmedizin Berlin, Berlin, Germany
- Department of Pediatric Neurology, Charité—Universitätsmedizin Berlin, Berlin, Germany
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Wang X, Sipila P, Si Z, Rosales JL, Gao X, Lee KY. CDK5RAP2 loss-of-function causes premature cell senescence via the GSK3β/β-catenin-WIP1 pathway. Cell Death Dis 2021; 13:9. [PMID: 34930892 PMCID: PMC8688469 DOI: 10.1038/s41419-021-04457-2] [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: 06/08/2021] [Revised: 11/23/2021] [Accepted: 12/07/2021] [Indexed: 12/03/2022]
Abstract
Developmental disorders characterized by small body size have been linked to CDK5RAP2 loss-of-function mutations, but the mechanisms underlying which remain obscure. Here, we demonstrate that knocking down CDK5RAP2 in human fibroblasts triggers premature cell senescence that is recapitulated in Cdk5rap2an/an mouse embryonic fibroblasts and embryos, which exhibit reduced body weight and size, and increased senescence-associated (SA)-β-gal staining compared to Cdk5rap2+/+ and Cdk5rap2+/an embryos. Interestingly, CDK5RAP2-knockdown human fibroblasts show increased p53 Ser15 phosphorylation that does not correlate with activation of p53 kinases, but rather correlates with decreased level of the p53 phosphatase, WIP1. Ectopic WIP1 expression reverses the senescent phenotype in CDK5RAP2-knockdown cells, indicating that senescence in these cells is linked to WIP1 downregulation. CDK5RAP2 interacts with GSK3β, causing increased inhibitory GSK3β Ser9 phosphorylation and inhibiting the activity of GSK3β, which phosphorylates β-catenin, tagging β-catenin for degradation. Thus, loss of CDK5RAP2 decreases GSK3β Ser9 phosphorylation and increases GSK3β activity, reducing nuclear β-catenin, which affects the expression of NF-κB target genes such as WIP1. Consequently, loss of CDK5RAP2 or β-catenin causes WIP1 downregulation. Inhibition of GSK3β activity restores β-catenin and WIP1 levels in CDK5RAP2-knockdown cells, reducing p53 Ser15 phosphorylation and preventing senescence in these cells. Conversely, inhibition of WIP1 activity increases p53 Ser15 phosphorylation and senescence in CDK5RAP2-depleted cells lacking GSK3β activity. These findings indicate that loss of CDK5RAP2 promotes premature cell senescence through GSK3β/β-catenin downregulation of WIP1. Premature cell senescence may contribute to reduced body size associated with CDK5RAP2 loss-of-function.
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Affiliation(s)
- Xidi Wang
- grid.22072.350000 0004 1936 7697Department of Cell Biology & Anatomy, Arnie Charbonneau Cancer and Alberta Children’s Hospital Research Institutes, Cumming School of Medicine, University of Calgary, Calgary, AB Canada ,grid.410736.70000 0001 2204 9268Department of Biochemistry & Molecular Biology, Harbin Medical University, Harbin, China
| | - Patrick Sipila
- grid.22072.350000 0004 1936 7697Department of Cell Biology & Anatomy, Arnie Charbonneau Cancer and Alberta Children’s Hospital Research Institutes, Cumming School of Medicine, University of Calgary, Calgary, AB Canada
| | - Zizhen Si
- grid.410736.70000 0001 2204 9268Department of Biochemistry & Molecular Biology, Harbin Medical University, Harbin, China
| | - Jesusa L. Rosales
- grid.22072.350000 0004 1936 7697Department of Cell Biology & Anatomy, Arnie Charbonneau Cancer and Alberta Children’s Hospital Research Institutes, Cumming School of Medicine, University of Calgary, Calgary, AB Canada
| | - Xu Gao
- grid.410736.70000 0001 2204 9268Department of Biochemistry & Molecular Biology, Harbin Medical University, Harbin, China
| | - Ki-Young Lee
- Department of Cell Biology & Anatomy, Arnie Charbonneau Cancer and Alberta Children's Hospital Research Institutes, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.
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Ben Ayed I, Bouchaala W, Bouzid A, Feki W, Souissi A, Ben Nsir S, Ben Said M, Sammouda T, Majdoub F, Kharrat I, Kamoun F, Elloumi I, Kamoun H, Tlili A, Masmoudi S, Triki C. Further insights into the spectrum phenotype of TRAPPC9 and CDK5RAP2 genes, segregating independently in a large Tunisian family with intellectual disability and microcephaly. Eur J Med Genet 2021; 64:104373. [PMID: 34737153 DOI: 10.1016/j.ejmg.2021.104373] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Revised: 10/06/2021] [Accepted: 10/27/2021] [Indexed: 10/20/2022]
Abstract
Intellectual disability (ID) often co-occurs with other neurologic phenotypes making molecular diagnosis more challenging particularly in consanguineous populations with the co-segregation of more than one ID-related gene in some cases. In this study, we investigated the phenotype of three patients from a large Tunisian family with significant ID phenotypic variability and microcephaly and performed a clinical exome sequencing in two cases. We identified, within the first branch, a homozygous variant in the TRAPPC9 gene (p.Arg472Ter) in two cases presenting severe ID, absent speech, congenital/secondary microcephaly in addition to autistic features, supporting the implication of TRAPPC9 in the "secondary" autism spectrum disorders and congenital microcephaly. In the second branch, we identified a homozygous variant (p.Lys189ArgfsTer15) in the CDK5RAP2 gene associated with an heterozygous TRAPPC9 variant (p.Arg472Ter) in one case harbouring primary hereditary microcephaly (MCPH) associated with an inter-hypothalamic adhesion, mixed hearing loss, selective thinning in the retinal nerve fiber layer and parafoveal ganglion cell complex, and short stature. Our findings expand the spectrum of the recently reported neurosensorial abnormalities and revealed the variable phenotype expressivity of CDK5RAP2 defect. Our study highlights the complexity of the genetic background of microcephaly/ID and the efficiency of the exome sequencing to provide an accurate diagnosis and to improve the management and follow-up of such patients.
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Affiliation(s)
- Ikhlas Ben Ayed
- Laboratory of Molecular and Cellular Screening Processes (LPCMC), Center of Biotechnology of Sfax, University of Sfax, Tunisia; Medical Genetics Department, University Hedi Chaker Hospital of Sfax, Tunisia.
| | - Wafa Bouchaala
- Child Neurology Department, University Hedi Chaker Hospital of Sfax, Tunisia; Research Laboratory "Neuropédiatrie" LR19ES15, Sfax University, Tunisia
| | - Amal Bouzid
- Laboratory of Molecular and Cellular Screening Processes (LPCMC), Center of Biotechnology of Sfax, University of Sfax, Tunisia; Medical Research, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - Wiem Feki
- Radiology Department, Hedi Chaker University Hospital, University of Sfax, Sfax, Tunisia
| | - Amal Souissi
- Laboratory of Molecular and Cellular Screening Processes (LPCMC), Center of Biotechnology of Sfax, University of Sfax, Tunisia
| | - Sihem Ben Nsir
- Child Neurology Department, University Hedi Chaker Hospital of Sfax, Tunisia; Research Laboratory "Neuropédiatrie" LR19ES15, Sfax University, Tunisia
| | - Mariem Ben Said
- Laboratory of Molecular and Cellular Screening Processes (LPCMC), Center of Biotechnology of Sfax, University of Sfax, Tunisia
| | - Takwa Sammouda
- Department of Ophthalmology, Habib Bourguiba Hospital, Sfax, Tunisia
| | - Fatma Majdoub
- Medical Genetics Department, University Hedi Chaker Hospital of Sfax, Tunisia
| | - Ines Kharrat
- Department of Otorhinolaryngology, University Habib Bourguiba Hospital of Sfax, Tunisia
| | - Fatma Kamoun
- Child Neurology Department, University Hedi Chaker Hospital of Sfax, Tunisia; Research Laboratory "Neuropédiatrie" LR19ES15, Sfax University, Tunisia
| | - Ines Elloumi
- Laboratory of Molecular and Cellular Screening Processes (LPCMC), Center of Biotechnology of Sfax, University of Sfax, Tunisia
| | - Hassen Kamoun
- Medical Genetics Department, University Hedi Chaker Hospital of Sfax, Tunisia; Laboratory of Human Molecular Genetics, LR33ES99, Faculty of Medicine of Sfax, University of Sfax, Sfax, Tunisia
| | - Abdelaziz Tlili
- Department of Applied Biology, College of Sciences, University of Sharjah, Sharjah, United Arab Emirates; Human Genetics and Stem Cell Laboratory, Research Institute of Sciences and Engineering, University of Sharjah, Sharjah, United Arab Emirates
| | - Saber Masmoudi
- Laboratory of Molecular and Cellular Screening Processes (LPCMC), Center of Biotechnology of Sfax, University of Sfax, Tunisia
| | - Chahnez Triki
- Child Neurology Department, University Hedi Chaker Hospital of Sfax, Tunisia; Research Laboratory "Neuropédiatrie" LR19ES15, Sfax University, Tunisia
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Courraud J, Chater-Diehl E, Durand B, Vincent M, Del Mar Muniz Moreno M, Boujelbene I, Drouot N, Genschik L, Schaefer E, Nizon M, Gerard B, Abramowicz M, Cogné B, Bronicki L, Burglen L, Barth M, Charles P, Colin E, Coubes C, David A, Delobel B, Demurger F, Passemard S, Denommé AS, Faivre L, Feger C, Fradin M, Francannet C, Genevieve D, Goldenberg A, Guerrot AM, Isidor B, Johannesen KM, Keren B, Kibæk M, Kuentz P, Mathieu-Dramard M, Demeer B, Metreau J, Steensbjerre Møller R, Moutton S, Pasquier L, Pilekær Sørensen K, Perrin L, Renaud M, Saugier P, Rio M, Svane J, Thevenon J, Tran Mau Them F, Tronhjem CE, Vitobello A, Layet V, Auvin S, Khachnaoui K, Birling MC, Drunat S, Bayat A, Dubourg C, El Chehadeh S, Fagerberg C, Mignot C, Guipponi M, Bienvenu T, Herault Y, Thompson J, Willems M, Mandel JL, Weksberg R, Piton A. Integrative approach to interpret DYRK1A variants, leading to a frequent neurodevelopmental disorder. Genet Med 2021; 23:2150-2159. [PMID: 34345024 DOI: 10.1038/s41436-021-01263-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 06/14/2021] [Accepted: 06/15/2021] [Indexed: 11/10/2022] Open
Abstract
PURPOSE DYRK1A syndrome is among the most frequent monogenic forms of intellectual disability (ID). We refined the molecular and clinical description of this disorder and developed tools to improve interpretation of missense variants, which remains a major challenge in human genetics. METHODS We reported clinical and molecular data for 50 individuals with ID harboring DYRK1A variants and developed (1) a specific DYRK1A clinical score; (2) amino acid conservation data generated from 100 DYRK1A sequences across different taxa; (3) in vitro overexpression assays to study level, cellular localization, and kinase activity of DYRK1A mutant proteins; and (4) a specific blood DNA methylation signature. RESULTS This integrative approach was successful to reclassify several variants as pathogenic. However, we questioned the involvement of some others, such as p.Thr588Asn, still reported as likely pathogenic, and showed it does not cause an obvious phenotype in mice. CONCLUSION Our study demonstrated the need for caution when interpreting variants in DYRK1A, even those occurring de novo. The tools developed will be useful to interpret accurately the variants identified in the future in this gene.
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Affiliation(s)
- Jérémie Courraud
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
- Centre National de la Recherche Scientifique, UMR7104, Illkirch, France
- Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France
- Université de Strasbourg, Illkirch, France
| | - Eric Chater-Diehl
- Genetics and Genome Biology, The Hospital for Sick Children, Toronto, ON, Canada
| | - Benjamin Durand
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
- Centre National de la Recherche Scientifique, UMR7104, Illkirch, France
- Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France
- Université de Strasbourg, Illkirch, France
| | - Marie Vincent
- Service de Génétique Médicale, CHU de Nantes & Inserm, CNRS, Université de Nantes, l'institut du thorax, Nantes, France
| | - Maria Del Mar Muniz Moreno
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
- Centre National de la Recherche Scientifique, UMR7104, Illkirch, France
- Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France
- Université de Strasbourg, Illkirch, France
| | - Imene Boujelbene
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
- Centre National de la Recherche Scientifique, UMR7104, Illkirch, France
- Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France
- Université de Strasbourg, Illkirch, France
- Unité de Génétique Moléculaire, IGMA, Hôpitaux Universitaire de Strasbourg, Strasbourg, France
| | - Nathalie Drouot
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
- Centre National de la Recherche Scientifique, UMR7104, Illkirch, France
- Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France
- Université de Strasbourg, Illkirch, France
| | - Loréline Genschik
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
- Centre National de la Recherche Scientifique, UMR7104, Illkirch, France
- Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France
- Université de Strasbourg, Illkirch, France
| | - Elise Schaefer
- Service de Génétique Médicale, IGMA, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Mathilde Nizon
- Service de Génétique Médicale, CHU de Nantes & Inserm, CNRS, Université de Nantes, l'institut du thorax, Nantes, France
| | - Bénédicte Gerard
- Unité de Génétique Moléculaire, IGMA, Hôpitaux Universitaire de Strasbourg, Strasbourg, France
| | - Marc Abramowicz
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - Benjamin Cogné
- Service de Génétique Médicale, CHU de Nantes & Inserm, CNRS, Université de Nantes, l'institut du thorax, Nantes, France
| | | | - Lydie Burglen
- Centre de référence des malformations et maladies congénitales du cervelet et Département de génétique et embryologie médicale, APHP, Sorbonne Université, Hôpital Armand Trousseau, Paris, France
| | - Magalie Barth
- Pediatrics & Biochemistry and Genetics, Department, Angers Hospital, Angers, France
| | - Perrine Charles
- Genetic Department, University Hospital Pitié-Salpêtrière, AP-HP, Paris, France
| | - Estelle Colin
- Pediatrics & Biochemistry and Genetics, Department, Angers Hospital, Angers, France
| | - Christine Coubes
- Département de Génétique Médicale maladies rares et médecine personnalisée, Centre de Référence Maladies Rares Anomalies du Développement, Hôpital Arnaud de Villeneuve, Université Montpellier, Montpellier, France
| | - Albert David
- Service de Génétique Médicale, CHU de Nantes & Inserm, CNRS, Université de Nantes, l'institut du thorax, Nantes, France
| | - Bruno Delobel
- Centre de Génétique Chromosomique, GHICL, Hôpital Saint Vincent de Paul, Lille, France
| | | | - Sandrine Passemard
- Département de Génétique, Hôpital Universitaire Robert Debré, APHP, Paris, France
| | - Anne-Sophie Denommé
- Centre de Génétique et Centre de Référence Anomalies du développement et Syndromes malformatifs, Hôpital d'Enfants and INSERM UMR1231 GAD, FHU TRANSLAD, CHU de Dijon, Dijon, France
- Unité Fonctionnelle d'Innovation en Diagnostique Génomique des Maladies Rares, Pôle de Biologie, FHU-TRANSLAD, CHU Dijon Bourgogne, Dijon, France
| | - Laurence Faivre
- Centre de Génétique et Centre de Référence Anomalies du développement et Syndromes malformatifs, Hôpital d'Enfants and INSERM UMR1231 GAD, FHU TRANSLAD, CHU de Dijon, Dijon, France
| | - Claire Feger
- Unité de Génétique Moléculaire, IGMA, Hôpitaux Universitaire de Strasbourg, Strasbourg, France
| | - Mélanie Fradin
- Centre de Référence Maladies Rares, Unité Fonctionnelle de Génétique Médicale, CHU, Rennes, France
| | - Christine Francannet
- Service de Génétique médicale, CHU de Clermont-Ferrand, Clermont-Ferrand, France
| | - David Genevieve
- Département de Génétique Médicale maladies rares et médecine personnalisée, Centre de Référence Maladies Rares Anomalies du Développement, Hôpital Arnaud de Villeneuve, Université Montpellier, Montpellier, France
| | - Alice Goldenberg
- Normandie Univ, UNIROUEN, Inserm U1245 and Rouen University Hospital, Department of Genetics and Reference Center for Developmental Disorders, F 76000, Normandy Center for Genomic and Personalized Medicine, Rouen, France
| | - Anne-Marie Guerrot
- Normandie Univ, UNIROUEN, Inserm U1245 and Rouen University Hospital, Department of Genetics and Reference Center for Developmental Disorders, F 76000, Normandy Center for Genomic and Personalized Medicine, Rouen, France
| | - Bertrand Isidor
- Service de Génétique Médicale, CHU de Nantes & Inserm, CNRS, Université de Nantes, l'institut du thorax, Nantes, France
| | - Katrine M Johannesen
- Department of Epilepsy Genetics and Personalized Treatment, The Danish Epilepsy Centre, Dianalund, Denmark
- Institute for Regional Health Services, University of Southern Denmark, Odense, Denmark
| | - Boris Keren
- Genetic Department, University Hospital Pitié-Salpêtrière, AP-HP, Paris, France
| | - Maria Kibæk
- Department of Clinical Genetics, Odense Denmark Hospital, Odense University Hospital, Odense, Denmark
| | - Paul Kuentz
- Centre de Génétique et Centre de Référence Anomalies du développement et Syndromes malformatifs, Hôpital d'Enfants and INSERM UMR1231 GAD, FHU TRANSLAD, CHU de Dijon, Dijon, France
| | - Michèle Mathieu-Dramard
- Service de Génétique Clinique, Centre de référence maladies rares, CHU d'Amiens-site Sud, Amiens, France
| | - Bénédicte Demeer
- Service de Génétique Clinique, Centre de référence maladies rares, CHU d'Amiens-site Sud, Amiens, France
| | - Julia Metreau
- APHP, Service de neurologie pédiatrique, Hôpital Universitaire Bicetre, Le Kremlin-Bicetre, France
| | - Rikke Steensbjerre Møller
- Department of Epilepsy Genetics and Personalized Treatment, The Danish Epilepsy Centre, Dianalund, Denmark
- Institute for Regional Health Services, University of Southern Denmark, Odense, Denmark
| | - Sébastien Moutton
- Centre de Génétique et Centre de Référence Anomalies du développement et Syndromes malformatifs, Hôpital d'Enfants and INSERM UMR1231 GAD, FHU TRANSLAD, CHU de Dijon, Dijon, France
| | - Laurent Pasquier
- Centre de Référence Maladies Rares, Unité Fonctionnelle de Génétique Médicale, CHU, Rennes, France
| | - Kristina Pilekær Sørensen
- Department of Clinical Genetics, Odense Denmark Hospital, Odense University Hospital, Odense, Denmark
| | - Laurence Perrin
- Department of Genetics, Robert Debré Hospital, AP-HP, Paris, France
| | - Mathilde Renaud
- Service de Génétique Clinique et de Neurologie, Hôpital Brabois Enfants, Nancy, France
| | - Pascale Saugier
- Normandie Univ, UNIROUEN, Inserm U1245 and Rouen University Hospital, Department of Genetics and Reference Center for Developmental Disorders, F 76000, Normandy Center for Genomic and Personalized Medicine, Rouen, France
| | - Marlène Rio
- Department of medical genetics and reference centre for rare intellectual disabilities, INSERM UMR 1163, Paris Descartes-Sorbonne Paris Cité University, Imagine Institute, Necker Enfants Malades Hospital, Paris, France
| | - Joane Svane
- Department of Clinical Genetics, Odense Denmark Hospital, Odense University Hospital, Odense, Denmark
| | - Julien Thevenon
- Department of Genetics and Reproduction, Centre Hospitalo-Universitaire Grenoble-Alpes, Grenoble, France
| | - Frédéric Tran Mau Them
- Centre de Génétique et Centre de Référence Anomalies du développement et Syndromes malformatifs, Hôpital d'Enfants and INSERM UMR1231 GAD, FHU TRANSLAD, CHU de Dijon, Dijon, France
- Unité Fonctionnelle d'Innovation en Diagnostique Génomique des Maladies Rares, Pôle de Biologie, FHU-TRANSLAD, CHU Dijon Bourgogne, Dijon, France
| | | | - Antonio Vitobello
- Centre de Génétique et Centre de Référence Anomalies du développement et Syndromes malformatifs, Hôpital d'Enfants and INSERM UMR1231 GAD, FHU TRANSLAD, CHU de Dijon, Dijon, France
| | - Valérie Layet
- Consultations de génétique, Groupe Hospitalier du Havre, Le Havre, France
| | - Stéphane Auvin
- Center for rare epilepsies & epilepsy unit Robert-Debré Hospital, APHP, & INSERM NeuroDiderot, Université de Paris, Paris, France
| | - Khaoula Khachnaoui
- Université Côte d'Azur, Inserm U1081, CNRS UMR7284, IRCAN, CHU de Nice, Nice, France
| | | | - Séverine Drunat
- Département de Génétique, Hôpital Universitaire Robert Debré, Paris, France
| | - Allan Bayat
- Department of Clinical Genetics, Odense Denmark Hospital, Odense University Hospital, Odense, Denmark
| | - Christèle Dubourg
- Laboratoire de Génétique Moléculaire, CHU Pontchaillou, UMR 6290 CNRS, IGDR, Faculté de Médecine, Université de Rennes 1, Rennes, France
| | - Salima El Chehadeh
- Unité de Génétique Moléculaire, IGMA, Hôpitaux Universitaire de Strasbourg, Strasbourg, France
| | - Christina Fagerberg
- Department of Clinical Genetics, Odense Denmark Hospital, Odense University Hospital, Odense, Denmark
| | - Cyril Mignot
- Pediatrics & Biochemistry and Genetics, Department, Angers Hospital, Angers, France
| | - Michel Guipponi
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - Thierry Bienvenu
- Molecular Genetics Laboratory, Cochin Hospital, APHP.Centre-Université de Paris, and INSERM UMR 1266, Institut de Psychiatrie et de Neurosciences de Paris, Paris, France
| | - Yann Herault
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
- Centre National de la Recherche Scientifique, UMR7104, Illkirch, France
- Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France
- Université de Strasbourg, Illkirch, France
| | - Julie Thompson
- Complex Systems and Translational Bioinformatics (CSTB), ICube laboratory-CNRS, Fédération de Médecine Translationnelle de Strasbourg (FMTS), University of Strasbourg, Strasbourg, France
| | - Marjolaine Willems
- Département de Génétique Médicale maladies rares et médecine personnalisée, Centre de Référence Maladies Rares Anomalies du Développement, Hôpital Arnaud de Villeneuve, Université Montpellier, Montpellier, France
| | - Jean-Louis Mandel
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
- Centre National de la Recherche Scientifique, UMR7104, Illkirch, France
- Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France
- Université de Strasbourg, Illkirch, France
| | - Rosanna Weksberg
- Genetics and Genome Biology, The Hospital for Sick Children, Toronto, ON, Canada
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, Toronto, ON, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
- Department of Pediatrics, University of Toronto, Toronto, ON, Canada
- Institute of Medical Science, School of Graduate Studies, University of Toronto, Toronto, ON, Canada
| | - Amélie Piton
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France.
- Centre National de la Recherche Scientifique, UMR7104, Illkirch, France.
- Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France.
- Université de Strasbourg, Illkirch, France.
- Unité de Génétique Moléculaire, IGMA, Hôpitaux Universitaire de Strasbourg, Strasbourg, France.
- Institut Universitaire de France, Paris, France.
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11
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Regulation of mRNA translation in stem cells; links to brain disorders. Cell Signal 2021; 88:110166. [PMID: 34624487 DOI: 10.1016/j.cellsig.2021.110166] [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: 06/06/2021] [Revised: 08/09/2021] [Accepted: 09/29/2021] [Indexed: 11/22/2022]
Abstract
Translational control of gene expression is emerging as a cardinal step in the regulation of protein abundance. Especially for embryonic (ESC) and neuronal stem cells (NSC), regulation of mRNA translation is involved in the maintenance of pluripotency but also differentiation. For neuronal stem cells this regulation is linked to the various neuronal subtypes that arise in the developing brain and is linked to numerous brain disorders. Herein, we review translational control mechanisms in ESCs and NSCs during development and differentiation, and briefly discuss their link to brain disorders.
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12
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Duerinckx S, Désir J, Perazzolo C, Badoer C, Jacquemin V, Soblet J, Maystadt I, Tunca Y, Blaumeiser B, Ceulemans B, Courtens W, Debray F, Destree A, Devriendt K, Jansen A, Keymolen K, Lederer D, Loeys B, Meuwissen M, Moortgat S, Mortier G, Nassogne M, Sekhara T, Van Coster R, Van Den Ende J, Van der Aa N, Van Esch H, Vanakker O, Verhelst H, Vilain C, Weckhuysen S, Passemard S, Verloes A, Aeby A, Deconinck N, Van Bogaert P, Pirson I, Abramowicz M. Phenotypes and genotypes in non-consanguineous and consanguineous primary microcephaly: High incidence of epilepsy. Mol Genet Genomic Med 2021; 9:e1768. [PMID: 34402213 PMCID: PMC8457702 DOI: 10.1002/mgg3.1768] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 05/06/2021] [Accepted: 07/03/2021] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Primary microcephaly (PM) is defined as a significant reduction in occipitofrontal circumference (OFC) of prenatal onset. Clinical and genetic heterogeneity of PM represents a diagnostic challenge. METHODS We performed detailed phenotypic and genomic analyses in a large cohort (n = 169) of patients referred for PM and could establish a molecular diagnosis in 38 patients. RESULTS Pathogenic variants in ASPM and WDR62 were the most frequent causes in non-consanguineous patients in our cohort. In consanguineous patients, microarray and targeted gene panel analyses reached a diagnostic yield of 67%, which contrasts with a much lower rate in non-consanguineous patients (9%). Our series includes 11 novel pathogenic variants and we identify novel candidate genes including IGF2BP3 and DNAH2. We confirm the progression of microcephaly over time in affected children. Epilepsy was an important associated feature in our PM cohort, affecting 34% of patients with a molecular confirmation of the PM diagnosis, with various degrees of severity and seizure types. CONCLUSION Our findings will help to prioritize genomic investigations, accelerate molecular diagnoses, and improve the management of PM patients.
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Affiliation(s)
- Sarah Duerinckx
- Institut de Recherche Interdisciplinaire en Biologie Humaine et moléculaireUniversité Libre de BruxellesBrusselsBelgium
| | - Julie Désir
- Centre de Génétique HumaineInstitut de Pathologie et de GénétiqueGosseliesBelgium
| | - Camille Perazzolo
- Institut de Recherche Interdisciplinaire en Biologie Humaine et moléculaireUniversité Libre de BruxellesBrusselsBelgium
| | - Cindy Badoer
- Department of GeneticsHôpital ErasmeULB Center of Human GeneticsUniversité Libre de BruxellesBrusselsBelgium
| | - Valérie Jacquemin
- Institut de Recherche Interdisciplinaire en Biologie Humaine et moléculaireUniversité Libre de BruxellesBrusselsBelgium
| | - Julie Soblet
- Department of GeneticsHôpital ErasmeULB Center of Human GeneticsUniversité Libre de BruxellesBrusselsBelgium
- Hôpital Universitaire des Enfants Reine Fabiola (HUDERF)Université Libre de BruxellesBrusselsBelgium
| | - Isabelle Maystadt
- Centre de Génétique HumaineInstitut de Pathologie et de GénétiqueGosseliesBelgium
| | - Yusuf Tunca
- Department of Medical GeneticsGülhane Faculty of Medicine & Gülhane Training and Research HospitalUniversity of Health Sciences TurkeyAnkaraTurkey
| | | | | | | | | | - Anne Destree
- Centre de Génétique HumaineInstitut de Pathologie et de GénétiqueGosseliesBelgium
| | | | - Anna Jansen
- Universitair Ziekenhuis Brussel (UZ Brussel)Centrum Medische GeneticaUniversiteit Brussel (VUB)BrusselsBelgium
| | - Kathelijn Keymolen
- Universitair Ziekenhuis Brussel (UZ Brussel)Centrum Medische GeneticaUniversiteit Brussel (VUB)BrusselsBelgium
| | - Damien Lederer
- Centre de Génétique HumaineInstitut de Pathologie et de GénétiqueGosseliesBelgium
| | - Bart Loeys
- University and University Hospital of AntwerpAntwerpBelgium
| | | | - Stéphanie Moortgat
- Centre de Génétique HumaineInstitut de Pathologie et de GénétiqueGosseliesBelgium
| | - Geert Mortier
- University and University Hospital of AntwerpAntwerpBelgium
| | | | | | | | | | | | - Hilde Van Esch
- Center for Human GeneticsUniversity Hospitals LeuvenLeuvenBelgium
| | | | | | - Catheline Vilain
- Department of GeneticsHôpital ErasmeULB Center of Human GeneticsUniversité Libre de BruxellesBrusselsBelgium
- Hôpital Universitaire des Enfants Reine Fabiola (HUDERF)Université Libre de BruxellesBrusselsBelgium
| | | | | | - Alain Verloes
- Department of GeneticsAPHPRobert Debré University HospitalParisFrance
| | - Alec Aeby
- Hôpital Universitaire des Enfants Reine Fabiola (HUDERF)Université Libre de BruxellesBrusselsBelgium
| | - Nicolas Deconinck
- Hôpital Universitaire des Enfants Reine Fabiola (HUDERF)Université Libre de BruxellesBrusselsBelgium
| | | | - Isabelle Pirson
- Institut de Recherche Interdisciplinaire en Biologie Humaine et moléculaireUniversité Libre de BruxellesBrusselsBelgium
| | - Marc Abramowicz
- Institut de Recherche Interdisciplinaire en Biologie Humaine et moléculaireUniversité Libre de BruxellesBrusselsBelgium
- Department of Genetic Medicine and DevelopmentUniversity of GenevaGenèveSwitzerland
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13
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González-Martínez J, Cwetsch AW, Martínez-Alonso D, López-Sainz LR, Almagro J, Melati A, Gómez J, Pérez-Martínez M, Megías D, Boskovic J, Gilabert-Juan J, Graña-Castro O, Pierani A, Behrens A, Ortega S, Malumbres M. Deficient adaptation to centrosome duplication defects in neural progenitors causes microcephaly and subcortical heterotopias. JCI Insight 2021; 6:e146364. [PMID: 34237032 PMCID: PMC8409993 DOI: 10.1172/jci.insight.146364] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 07/07/2021] [Indexed: 11/17/2022] Open
Abstract
Congenital microcephaly (MCPH) is a neurodevelopmental disease associated with mutations in genes encoding proteins involved in centrosomal and chromosomal dynamics during mitosis. Detailed MCPH pathogenesis at the cellular level is still elusive, given the diversity of MCPH genes and lack of comparative in vivo studies. By generating a series of CRISPR/Cas9-mediated genetic KOs, we report here that — whereas defects in spindle pole proteins (ASPM, MCPH5) result in mild MCPH during development — lack of centrosome (CDK5RAP2, MCPH3) or centriole (CEP135, MCPH8) regulators induces delayed chromosome segregation and chromosomal instability in neural progenitors (NPs). Our mouse model of MCPH8 suggests that loss of CEP135 results in centriole duplication defects, TP53 activation, and cell death of NPs. Trp53 ablation in a Cep135-deficient background prevents cell death but not MCPH, and it leads to subcortical heterotopias, a malformation seen in MCPH8 patients. These results suggest that MCPH in some MCPH patients can arise from the lack of adaptation to centriole defects in NPs and may lead to architectural defects if chromosomally unstable cells are not eliminated during brain development.
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Affiliation(s)
- José González-Martínez
- Cell Division and Cancer group, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Andrzej W Cwetsch
- Cell Division and Cancer group, Spanish National Cancer Research Centre (CNIO), Madrid, Spain.,Imagine Institute of Genetic Diseases, University of Paris, Paris, France.,Institute of Psychiatry and Neuroscience of Paris, INSERM U-1266, University of Paris, Paris, France
| | - Diego Martínez-Alonso
- Cell Division and Cancer group, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Luis R López-Sainz
- Cell Division and Cancer group, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Jorge Almagro
- Adult Stem Cell Laboratory, The Francis Crick Institute, London, United Kingdom
| | - Anna Melati
- Cell Division and Cancer group, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | | | | | | | | | - Javier Gilabert-Juan
- Cell Division and Cancer group, Spanish National Cancer Research Centre (CNIO), Madrid, Spain.,University of Paris, NeuroDiderot, Inserm, Paris, France
| | | | - Alessandra Pierani
- Imagine Institute of Genetic Diseases, University of Paris, Paris, France.,Institute of Psychiatry and Neuroscience of Paris, INSERM U-1266, University of Paris, Paris, France
| | - Axel Behrens
- Adult Stem Cell Laboratory, The Francis Crick Institute, London, United Kingdom.,Faculty of Life Sciences, King's College London, Guy's Campus, London, United Kingdom
| | | | - Marcos Malumbres
- Cell Division and Cancer group, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
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14
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Cheng C, Yang Y, Zhu X, Yu X, Zhang T, Yang F, Chen F, Chen X, Zhao S, Guo J. Novel compound heterozygous variants in the STIL gene identified in a Chinese family with presentation of foetal microcephaly. Eur J Med Genet 2020; 63:104091. [PMID: 33132204 DOI: 10.1016/j.ejmg.2020.104091] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 10/18/2020] [Accepted: 10/20/2020] [Indexed: 11/26/2022]
Abstract
Primary microcephaly 7 (MCPH7) is an autosomal recessive human neurodevelopmental disorder characterized by microcephaly, sloping forehead, and prominent midface. The STIL gene encodes a protein that regulates the mitotic spindle checkpoint. STIL is the pathogenic gene of MCPH7. Although more than 25 genes have been reported to cause MCPH, many patients lack a molecular diagnosis. The clinical manifestations and genetic factors of MCPH7 remain to be revealed. This research reported two consecutive microcephalic foetuses from unaffected parents. Prenatal ultrasound examination and pre- and postnatal MRI studies were performed. Whole-genome sequencing (WGS) was performed using blood derived from the umbilical cord, and variants were confirmed by Sanger sequencing on the parents. Ultrasound examination showed that the two foetuses suffered primary microcephaly. Using the WGS approach, novel compound heterozygous variants in STIL (c.2344_2347delTTGC, p. Leu782Thrfs*2 in exon 13; c.3838C > T, p. Arg1280Cys in exon 17) were identified in two foetuses with MCPH7. The MRI results of the two siblings were quite similar. Postnatal MRI confirmed the ultrasound and prenatal examinations. The two foetuses had typical microcephaly. Ultrasound and MRI showed that the two foetuses had a thick skull plate, significantly reduced bilateral frontal lobe, upward rotated cerebellum vermis, and dilated fourth ventricle. Our findings have important implications for prenatal diagnosis and genetic counselling for any patients with MCPH7. We extend both the mutational spectrum in the STIL gene and the clinical spectrum of MCPH7.
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Affiliation(s)
- Chen Cheng
- Department of Ultrasonography, Maternal and Child Health Hospital of Hubei Province, Wuhan, 430070, China
| | - Ying Yang
- BGI-Shenzhen, Shenzhen, 518083, China; Shenzhen Engineering Laboratory for Birth Defects Screening, BGI-Shenzhen, Shenzhen, 518083, China
| | - Xia Zhu
- Department of Ultrasonography, Maternal and Child Health Hospital of Hubei Province, Wuhan, 430070, China
| | - Xudong Yu
- Department of Ultrasonography, Maternal and Child Health Hospital of Hubei Province, Wuhan, 430070, China
| | | | - Fan Yang
- Department of Ultrasonography, Maternal and Child Health Hospital of Hubei Province, Wuhan, 430070, China
| | - Fang Chen
- BGI-Shenzhen, Shenzhen, 518083, China; Shenzhen Engineering Laboratory for Birth Defects Screening, BGI-Shenzhen, Shenzhen, 518083, China
| | - Xinlin Chen
- Department of Ultrasonography, Maternal and Child Health Hospital of Hubei Province, Wuhan, 430070, China
| | - Sheng Zhao
- Department of Ultrasonography, Maternal and Child Health Hospital of Hubei Province, Wuhan, 430070, China.
| | - Jian Guo
- BGI-Shenzhen, Shenzhen, 518083, China.
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15
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Cep215 is essential for morphological differentiation of astrocytes. Sci Rep 2020; 10:17000. [PMID: 33046744 PMCID: PMC7550586 DOI: 10.1038/s41598-020-72728-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 08/31/2020] [Indexed: 11/08/2022] Open
Abstract
Cep215 (also known as Cdk5rap2) is a centrosome protein which is involved in microtubule organization. Cep215 is also placed at specific subcellular locations and organizes microtubules outside the centrosome. Here, we report that Cep215 is involved in morphological differentiation of astrocytes. Cep215 was specifically localized at the glial processes as well as centrosomes in developing astrocytes. Morphological differentiation of astrocytes was suppressed in the Cep215-deleted P19 cells and in the Cep215-depleted embryonic hippocampal culture. We confirm that the microtubule organizing function of Cep215 is critical for the glial process formation. However, Cep215 is not involved in the regulation of cell proliferation nor cell specification. Based on the results, we propose that Cep215 organizes microtubules for glial process formation during astrocyte differentiation.
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