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Kaiyrzhanov R, Ortigoza-Escobar JD, Stringer BW, Ganieva M, Gowda VK, Srinivasan VM, Macaya A, Laner A, Onbool E, Al-Shammari R, Al-Owain M, Deconinck N, Vilain C, Dontaine P, Self E, Akram R, Hussain G, Baig SM, Iqbal J, Salpietro V, Neshatdoust M, Kasiri M, Yesil G, Uygur T, Pysden K, Berry IR, Alves CA, Giacomotto J, Houlden H, Maroofian R. Clinical and Molecular Spectrum of Autosomal Recessive CA8-Related Cerebellar Ataxia. Mov Disord 2024; 39:983-995. [PMID: 38581205 DOI: 10.1002/mds.29754] [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: 10/01/2023] [Revised: 01/29/2024] [Accepted: 02/05/2024] [Indexed: 04/08/2024] Open
Abstract
BACKGROUND Based on a limited number of reported families, biallelic CA8 variants have currently been associated with a recessive neurological disorder named, cerebellar ataxia, mental retardation, and dysequilibrium syndrome 3 (CAMRQ-3). OBJECTIVES We aim to comprehensively investigate CA8-related disorders (CA8-RD) by reviewing existing literature and exploring neurological, neuroradiological, and molecular observations in a cohort of newly identified patients. METHODS We analyzed the phenotype of 27 affected individuals from 14 families with biallelic CA8 variants (including data from 15 newly identified patients from eight families), ages 4 to 35 years. Clinical, genetic, and radiological assessments were performed, and zebrafish models with ca8 knockout were used for functional analysis. RESULTS Patients exhibited varying degrees of neurodevelopmental disorders (NDD), along with predominantly progressive cerebellar ataxia and pyramidal signs and variable bradykinesia, dystonia, and sensory impairment. Quadrupedal gait was present in only 10 of 27 patients. Progressive selective cerebellar atrophy, predominantly affecting the superior vermis, was a key diagnostic finding in all patients. Seven novel homozygous CA8 variants were identified. Zebrafish models demonstrated impaired early neurodevelopment and motor behavior on ca8 knockout. CONCLUSION Our comprehensive analysis of phenotypic features indicates that CA8-RD exhibits a wide range of clinical manifestations, setting it apart from other subtypes within the category of CAMRQ. CA8-RD is characterized by cerebellar atrophy and should be recognized as part of the autosomal-recessive cerebellar ataxias associated with NDD. Notably, the presence of progressive superior vermis atrophy serves as a valuable diagnostic indicator. © 2024 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Rauan Kaiyrzhanov
- Department of Neuromuscular Disorders, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom
| | - Juan Darío Ortigoza-Escobar
- U-703 Centre for Biomedical Research on Rare Diseases (CIBER-ER), Instituto de Salud Carlos III, Barcelona, Spain
- Movement Disorders Unit, Pediatric Neurology Department, Institut de Recerca, Hospital Sant Joan de Déu Barcelona, Barcelona, Spain
- European Reference Network for Rare Neurological Diseases (ERN-RND), Barcelona, Spain
| | - Brett W Stringer
- Griffith Institute for Drug Discovery, Centre for Cellular Phenomics, School of Environment and Science Griffith University, Brisbane, Queensland, Australia
| | - Manizha Ganieva
- Avicenna Tajik State Medical University, Department of Neurology and Medical Genetics, Dushanbe, Tajikistan
| | - Vykuntaraju K Gowda
- Department of Pediatric Neurology, Indira Gandhi Institute of Child Health, Bangalore, India
| | | | - Alfons Macaya
- European Reference Network for Rare Neurological Diseases (ERN-RND), Barcelona, Spain
- Department of Paediatric Neurology, University Hospital Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain
| | | | - Enas Onbool
- Neurology department, King Abdulaziz Specialist Hospital, Skaka Aljouf, Saudi Arabia
| | - Randa Al-Shammari
- Department of Medical Genomics, Centre for Genomic Medicine, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
| | - Mohammed Al-Owain
- Department of Medical Genomics, Centre for Genomic Medicine, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
- College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Nicolas Deconinck
- Centre de Référence des Maladies Neuromusculaires et Service de Neurologie Pédiatrique, Hôpital Universitaire des Enfants Reine Fabiola (HUDERF), Hôpital Universitaire de Bruxelles (HUB), Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Catheline Vilain
- Department of Genetics, Hôpital Universitaire Reine Fabiola (HUDERF); Hôpital Universitaire de Bruxelles (HUB), Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Pauline Dontaine
- Centre de Référence des Maladies Neuromusculaires et Service de Neurologie Pédiatrique, Hôpital Universitaire des Enfants Reine Fabiola (HUDERF), Hôpital Universitaire de Bruxelles (HUB), Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Eleanor Self
- Department of Neuromuscular Disorders, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom
| | - Rabia Akram
- Department of Neuromuscular Disorders, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom
- Neurochemical biology and Genetics Laboratory (NGL), Department of Physiology, Faculty of Life Sciences, Government College University, Faisalabad, Pakistan
| | - Ghulam Hussain
- Neurochemical biology and Genetics Laboratory (NGL), Department of Physiology, Faculty of Life Sciences, Government College University, Faisalabad, Pakistan
| | - Shahid Mahmood Baig
- Human Molecular Genetics Laboratory, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) College, Faisalabad, Pakistan
- Department of Biological and Biomedical Sciences, Aga Khan University, Karachi, Pakistan
| | - Javed Iqbal
- Department of Neurology, Allied Hospital, Faisalabad Medical University, Faisalabad, Pakistan
| | - Vincenzo Salpietro
- Department of Neuromuscular Disorders, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom
| | - Maedeh Neshatdoust
- Department of Cell and Molecular Biology and Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
| | - Mahboubeh Kasiri
- School of Medicine, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Gozde Yesil
- Department of Medical Genetics, Istanbul University, Istanbul Faculty of Medicine, Istanbul, Turkey
| | - Turkan Uygur
- Department of Pediatric Neurology, Bezmialem Vakif University, İstanbul, Turkey
| | - Karen Pysden
- Paediatric Neurology Department, Leeds Teaching Hospitals, Leeds General Infirmary, Leeds, United Kingdom
| | - Ian R Berry
- Yorkshire and North East Genomic Laboratory Hub Central Laboratory, Leeds, United Kingdom
| | - Cesar Augusto Alves
- Department of Radiology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Jean Giacomotto
- Griffith Institute for Drug Discovery, Centre for Cellular Phenomics, School of Environment and Science Griffith University, Brisbane, Queensland, Australia
- Queensland Brain Institute, The University of Queensland, Brisbane, Queensland, Australia
| | - Henry Houlden
- Department of Neuromuscular Disorders, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom
| | - Reza Maroofian
- Department of Neuromuscular Disorders, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom
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Sekerková G, Kilic S, Cheng YH, Fredrick N, Osmani A, Kim H, Opal P, Martina M. Phenotypical, genotypical and pathological characterization of the moonwalker mouse, a model of ataxia. Neurobiol Dis 2024; 195:106492. [PMID: 38575093 PMCID: PMC11089908 DOI: 10.1016/j.nbd.2024.106492] [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: 11/01/2023] [Revised: 03/13/2024] [Accepted: 04/01/2024] [Indexed: 04/06/2024] Open
Abstract
We performed a comprehensive study of the morphological, functional, and genetic features of moonwalker (MWK) mice, a mouse model of spinocerebellar ataxia caused by a gain of function of the TRPC3 channel. These mice show numerous behavioral symptoms including tremor, altered gait, circling behavior, impaired motor coordination, impaired motor learning and decreased limb strength. Cerebellar pathology is characterized by early and almost complete loss of unipolar brush cells as well as slowly progressive, moderate loss of Purkinje cell (PCs). Structural damage also includes loss of synaptic contacts from parallel fibers, swollen ER structures, and degenerating axons. Interestingly, no obvious correlation was observed between PC loss and severity of the symptoms, as the phenotype stabilizes around 2 months of age, while the cerebellar pathology is progressive. This is probably due to the fact that PC function is severely impaired much earlier than the appearance of PC loss. Indeed, PC firing is already impaired in 3 weeks old mice. An interesting feature of the MWK pathology that still remains to be explained consists in a strong lobule selectivity of the PC loss, which is puzzling considering that TRPC is expressed in every PC. Intriguingly, genetic analysis of MWK cerebella shows, among other alterations, changes in the expression of both apoptosis inducing and resistance factors possibly suggesting that damaged PCs initiate specific cellular pathways that protect them from overt cell loss.
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Affiliation(s)
- Gabriella Sekerková
- Department of Neuroscience, Northwestern University, Feinberg School of Medicine, 300 E. Superior, Chicago, IL 60611, USA.
| | - Sumeyra Kilic
- Department of Neuroscience, Northwestern University, Feinberg School of Medicine, 300 E. Superior, Chicago, IL 60611, USA
| | - Yen-Hsin Cheng
- Department of Neuroscience, Northwestern University, Feinberg School of Medicine, 300 E. Superior, Chicago, IL 60611, USA
| | - Natalie Fredrick
- Department of Neurology, Northwestern University, Feinberg School of Medicine, 300 E. Superior, Chicago, IL 60611, USA
| | - Anne Osmani
- Department of Neuroscience, Northwestern University, Feinberg School of Medicine, 300 E. Superior, Chicago, IL 60611, USA
| | - Haram Kim
- Department of Neuroscience, Northwestern University, Feinberg School of Medicine, 300 E. Superior, Chicago, IL 60611, USA
| | - Puneet Opal
- Department of Neurology, Northwestern University, Feinberg School of Medicine, 300 E. Superior, Chicago, IL 60611, USA
| | - Marco Martina
- Department of Neuroscience, Northwestern University, Feinberg School of Medicine, 300 E. Superior, Chicago, IL 60611, USA.
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Chesneau B, Calvas P, Cassagne M, Varenne F, Rozet JM, Bonneville F, Chassaing N, Fournié P, Fares-Taie L, Plaisancié J. ITPR1: The missing gene in miosis-ataxia syndrome? Am J Med Genet A 2024:e63655. [PMID: 38711238 DOI: 10.1002/ajmg.a.63655] [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: 01/24/2024] [Revised: 03/23/2024] [Accepted: 04/26/2024] [Indexed: 05/08/2024]
Abstract
The association of early-onset non-progressive ataxia and miosis is an extremely rare phenotypic entity occasionally reported in the literature. To date, only one family (two siblings and their mother) has benefited from a genetic diagnosis by the identification of a missense heterozygous variant (p.Arg36Cys) in the ITPR1 gene. This gene encodes the inositol 1,4,5-trisphosphate receptor type 1, an intracellular channel that mediates calcium release from the endoplasmic reticulum. Deleterious variants in this gene are known to be associated with two types of spinocerebellar ataxia, SCA15 and SCA29, and with Gillespie syndrome that is associated with ataxia, partial iris hypoplasia, and intellectual disability. In this work, we describe a novel individual carrying a heterozygous missense variant (p.Arg36Pro) at the same position in the N-terminal suppressor domain of ITPR1 as the family previously reported, with the same phenotype associating early-onset non-progressive ataxia and miosis. This second report confirms the implication of ITPR1 in the miosis-ataxia syndrome and therefore broadens the clinical spectrum of the gene. Moreover, the high specificity of the phenotype makes it a recognizable syndrome of genetic origin.
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Affiliation(s)
- Bertrand Chesneau
- Laboratoire de Référence (LBMR) des anomalies malformatives de l'œil, Institut Fédératif de Biologie (IFB), CHU Toulouse, Toulouse, France
- Centre de Référence des Affections Rares en Génétique Ophtalmologique, CARGO, site constitutif, CHU Toulouse, Toulouse, France
- Molecular, Cellular and Developmental Biology Unit (MCD), Centre de Biologie Intégrative (CBI), Université de Toulouse, CNRS, UPS, Toulouse, France
| | - Patrick Calvas
- Centre de Référence des Affections Rares en Génétique Ophtalmologique, CARGO, site constitutif, CHU Toulouse, Toulouse, France
| | | | - Fanny Varenne
- Centre de Référence des Affections Rares en Génétique Ophtalmologique, CARGO, site constitutif, CHU Toulouse, Toulouse, France
- Service d'Ophtalmologie, Hôpital Purpan, Toulouse, France
| | - Jean-Michel Rozet
- Laboratoire de Génétique Ophtalmologique, INSERM U1163, Institut Imagine, Paris, France
| | - Fabrice Bonneville
- Département de Neuroradiologie, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Nicolas Chassaing
- Laboratoire de Référence (LBMR) des anomalies malformatives de l'œil, Institut Fédératif de Biologie (IFB), CHU Toulouse, Toulouse, France
- Centre de Référence des Affections Rares en Génétique Ophtalmologique, CARGO, site constitutif, CHU Toulouse, Toulouse, France
| | - Pierre Fournié
- Service d'Ophtalmologie, Hôpital Purpan, Toulouse, France
| | - Lucas Fares-Taie
- Laboratoire de Génétique Ophtalmologique, INSERM U1163, Institut Imagine, Paris, France
| | - Julie Plaisancié
- Laboratoire de Référence (LBMR) des anomalies malformatives de l'œil, Institut Fédératif de Biologie (IFB), CHU Toulouse, Toulouse, France
- Centre de Référence des Affections Rares en Génétique Ophtalmologique, CARGO, site constitutif, CHU Toulouse, Toulouse, France
- Molecular, Cellular and Developmental Biology Unit (MCD), Centre de Biologie Intégrative (CBI), Université de Toulouse, CNRS, UPS, Toulouse, France
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Li S, Zhao S, Sinson JC, Bajic A, Rosenfeld JA, Neeley MB, Pena M, Worley KC, Burrage LC, Weisz-Hubshman M, Ketkar S, Craigen WJ, Clark GD, Lalani S, Bacino CA, Machol K, Chao HT, Potocki L, Emrick L, Sheppard J, Nguyen MTT, Khoramnia A, Hernandez PP, Nagamani SC, Liu Z, Eng CM, Lee B, Liu P. The clinical utility and diagnostic implementation of human subject cell transdifferentiation followed by RNA sequencing. Am J Hum Genet 2024; 111:841-862. [PMID: 38593811 PMCID: PMC11080285 DOI: 10.1016/j.ajhg.2024.03.007] [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: 10/04/2023] [Revised: 03/08/2024] [Accepted: 03/11/2024] [Indexed: 04/11/2024] Open
Abstract
RNA sequencing (RNA-seq) has recently been used in translational research settings to facilitate diagnoses of Mendelian disorders. A significant obstacle for clinical laboratories in adopting RNA-seq is the low or absent expression of a significant number of disease-associated genes/transcripts in clinically accessible samples. As this is especially problematic in neurological diseases, we developed a clinical diagnostic approach that enhanced the detection and evaluation of tissue-specific genes/transcripts through fibroblast-to-neuron cell transdifferentiation. The approach is designed specifically to suit clinical implementation, emphasizing simplicity, cost effectiveness, turnaround time, and reproducibility. For clinical validation, we generated induced neurons (iNeurons) from 71 individuals with primary neurological phenotypes recruited to the Undiagnosed Diseases Network. The overall diagnostic yield was 25.4%. Over a quarter of the diagnostic findings benefited from transdifferentiation and could not be achieved by fibroblast RNA-seq alone. This iNeuron transcriptomic approach can be effectively integrated into diagnostic whole-transcriptome evaluation of individuals with genetic disorders.
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Affiliation(s)
- Shenglan Li
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Sen Zhao
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Jefferson C Sinson
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Aleksandar Bajic
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Jan and Dan Duncan Neurological Research Institute at Texas Children's Hospital, Houston, TX, USA; Advanced Technology Cores, Baylor College of Medicine, Houston, TX, USA
| | - Jill A Rosenfeld
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Matthew B Neeley
- Graduate Program in Quantitative and Computational Biosciences, Baylor College of Medicine, Houston, TX, USA
| | - Mezthly Pena
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Kim C Worley
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Lindsay C Burrage
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, Houston, TX, USA
| | - Monika Weisz-Hubshman
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, Houston, TX, USA
| | - Shamika Ketkar
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - William J Craigen
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, Houston, TX, USA
| | - Gary D Clark
- Department of Pediatrics, Section of Neurology, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, Houston, TX, USA
| | - Seema Lalani
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, Houston, TX, USA
| | - Carlos A Bacino
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, Houston, TX, USA
| | - Keren Machol
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, Houston, TX, USA
| | - Hsiao-Tuan Chao
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Jan and Dan Duncan Neurological Research Institute at Texas Children's Hospital, Houston, TX, USA; Department of Pediatrics, Section of Neurology, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, Houston, TX, USA; Department of Neuroscience, Baylor College of Medicine, Houston, TX, USA; Cain Pediatric Research Foundation Laboratories, Jan and Dan Duncan Neurological Research Institute at Texas Children's Hospital, Houston, TX, USA; McNair Medical Institute, The Robert and Janice McNair Foundation, Houston, TX, USA
| | - Lorraine Potocki
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, Houston, TX, USA
| | - Lisa Emrick
- Department of Pediatrics, Section of Neurology, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, Houston, TX, USA
| | - Jennifer Sheppard
- Jan and Dan Duncan Neurological Research Institute at Texas Children's Hospital, Houston, TX, USA; Department of Pediatrics, Section of Neurology, Baylor College of Medicine, Houston, TX, USA
| | - My T T Nguyen
- Jan and Dan Duncan Neurological Research Institute at Texas Children's Hospital, Houston, TX, USA
| | - Anahita Khoramnia
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | | | - Sandesh Cs Nagamani
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, Houston, TX, USA
| | - Zhandong Liu
- Jan and Dan Duncan Neurological Research Institute at Texas Children's Hospital, Houston, TX, USA; Graduate Program in Quantitative and Computational Biosciences, Baylor College of Medicine, Houston, TX, USA; Department of Pediatrics, Section of Neurology, Baylor College of Medicine, Houston, TX, USA
| | - Christine M Eng
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Baylor Genetics, Houston, TX, USA
| | - Brendan Lee
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, Houston, TX, USA
| | - Pengfei Liu
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Baylor Genetics, Houston, TX, USA.
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Salari M, Etemadifar M, Rashedi R, Mardani S. A Review of Ocular Movement Abnormalities in Hereditary Cerebellar Ataxias. CEREBELLUM (LONDON, ENGLAND) 2024; 23:702-721. [PMID: 37000369 DOI: 10.1007/s12311-023-01554-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/21/2023] [Indexed: 04/01/2023]
Abstract
Cerebellar ataxias are a wide heterogeneous group of disorders that may present with fine motor deficits as well as gait and balance disturbances that have a significant influence on everyday activities. To review the ocular movements in cerebellar ataxias in order to improve the clinical knowledge of cerebellar ataxias and related subtypes. English papers published from January 1990 to May 2022 were selected by searching PubMed services. The main search keywords were ocular motor, oculomotor, eye movement, eye motility, and ocular motility, along with each ataxia subtype. The eligible papers were analyzed for clinical presentation, involved mutations, the underlying pathology, and ocular movement alterations. Forty-three subtypes of spinocerebellar ataxias and a number of autosomal dominant and autosomal recessive ataxias were discussed in terms of pathology, clinical manifestations, involved mutations, and with a focus on the ocular abnormalities. A flowchart has been made using ocular movement manifestations to differentiate different ataxia subtypes. And underlying pathology of each subtype is reviewed in form of illustrated models to reach a better understanding of each disorder.
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Affiliation(s)
- Mehri Salari
- Neurology Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Masoud Etemadifar
- Department of Functional Neurosurgery, Medical School, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Ronak Rashedi
- Neurology Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Sayna Mardani
- Neurology Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Paull TT, Woolley PR. A-T neurodegeneration and DNA damage-induced transcriptional stress. DNA Repair (Amst) 2024; 135:103647. [PMID: 38377644 DOI: 10.1016/j.dnarep.2024.103647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 02/08/2024] [Indexed: 02/22/2024]
Abstract
Loss of the ATM protein kinase in humans results in Ataxia-telangiectasia, a disorder characterized by childhood-onset neurodegeneration of the cerebellum as well as cancer predisposition and immunodeficiency. Although many aspects of ATM function are well-understood, the mechanistic basis of the progressive cerebellar ataxia that occurs in patients is not. Here we review recent progress related to the role of ATM in neurons and the cerebellum that comes from many sources: animal models, post-mortem brain tissue samples, and human neurons in culture. These observations have revealed new insights into the consequences of ATM loss on DNA damage, gene expression, and immune signaling in the brain. Many results point to the importance of reactive oxygen species as well as single-strand DNA breaks in the progression of molecular events leading to neuronal dysfunction. In addition, innate immunity signaling pathways appear to play a critical role in ATM functions in microglia, responding to various forms of nucleic acid sensors and regulating survival of neurons and other cell types. Overall, the results lead to an updated view of transcriptional stress and DNA damage resulting from ATM loss that results in changes in gene expression as well as neuroinflammation that contribute to the cerebellar neurodegeneration observed in patients.
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Affiliation(s)
- Tanya T Paull
- The University of Texas at Austin, Department of Molecular Biosciences, Austin, TX 78712, USA.
| | - Phillip R Woolley
- The University of Texas at Austin, Department of Molecular Biosciences, Austin, TX 78712, USA
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Shorrock HK, Lennon CD, Aliyeva A, Davey EE, DeMeo CC, Pritchard CE, Planco L, Velez JM, Mascorro-Huamancaja A, Shin DS, Cleary JD, Berglund JA. Widespread alternative splicing dysregulation occurs presymptomatically in CAG expansion spinocerebellar ataxias. Brain 2024; 147:486-504. [PMID: 37776516 PMCID: PMC10834251 DOI: 10.1093/brain/awad329] [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: 05/31/2023] [Revised: 07/31/2023] [Accepted: 09/03/2023] [Indexed: 10/02/2023] Open
Abstract
The spinocerebellar ataxias (SCAs) are a group of dominantly inherited neurodegenerative diseases, several of which are caused by CAG expansion mutations (SCAs 1, 2, 3, 6, 7 and 12) and more broadly belong to the large family of over 40 microsatellite expansion diseases. While dysregulation of alternative splicing is a well defined driver of disease pathogenesis across several microsatellite diseases, the contribution of alternative splicing in CAG expansion SCAs is poorly understood. Furthermore, despite extensive studies on differential gene expression, there remains a gap in our understanding of presymptomatic transcriptomic drivers of disease. We sought to address these knowledge gaps through a comprehensive study of 29 publicly available RNA-sequencing datasets. We identified that dysregulation of alternative splicing is widespread across CAG expansion mouse models of SCAs 1, 3 and 7. These changes were detected presymptomatically, persisted throughout disease progression, were repeat length-dependent, and were present in brain regions implicated in SCA pathogenesis including the cerebellum, pons and medulla. Across disease progression, changes in alternative splicing occurred in genes that function in pathways and processes known to be impaired in SCAs, such as ion channels, synaptic signalling, transcriptional regulation and the cytoskeleton. We validated several key alternative splicing events with known functional consequences, including Trpc3 exon 9 and Kcnma1 exon 23b, in the Atxn1154Q/2Q mouse model. Finally, we demonstrated that alternative splicing dysregulation is responsive to therapeutic intervention in CAG expansion SCAs with Atxn1 targeting antisense oligonucleotide rescuing key splicing events. Taken together, these data demonstrate that widespread presymptomatic dysregulation of alternative splicing in CAG expansion SCAs may contribute to disease onset, early neuronal dysfunction and may represent novel biomarkers across this devastating group of neurodegenerative disorders.
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Affiliation(s)
| | - Claudia D Lennon
- The RNA Institute, University at Albany—SUNY, Albany, NY 12222, USA
| | - Asmer Aliyeva
- The RNA Institute, University at Albany—SUNY, Albany, NY 12222, USA
- Department of Biology, University at Albany—SUNY, Albany, NY 12222, USA
| | - Emily E Davey
- The RNA Institute, University at Albany—SUNY, Albany, NY 12222, USA
| | - Cristina C DeMeo
- The RNA Institute, University at Albany—SUNY, Albany, NY 12222, USA
| | | | - Lori Planco
- The RNA Institute, University at Albany—SUNY, Albany, NY 12222, USA
| | - Jose M Velez
- The RNA Institute, University at Albany—SUNY, Albany, NY 12222, USA
- Department of Biology, University at Albany—SUNY, Albany, NY 12222, USA
| | | | - Damian S Shin
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany, NY 12208, USA
| | - John D Cleary
- The RNA Institute, University at Albany—SUNY, Albany, NY 12222, USA
| | - J Andrew Berglund
- The RNA Institute, University at Albany—SUNY, Albany, NY 12222, USA
- Department of Biology, University at Albany—SUNY, Albany, NY 12222, USA
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Lai J, Demirbas D, Kim J, Jeffries AM, Tolles A, Park J, Chittenden TW, Buckley PG, Yu TW, Lodato MA, Lee EA. ATM-deficiency-induced microglial activation promotes neurodegeneration in ataxia-telangiectasia. Cell Rep 2024; 43:113622. [PMID: 38159274 PMCID: PMC10908398 DOI: 10.1016/j.celrep.2023.113622] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/26/2023] [Accepted: 12/08/2023] [Indexed: 01/03/2024] Open
Abstract
While ATM loss of function has long been identified as the genetic cause of ataxia-telangiectasia (A-T), how it leads to selective and progressive degeneration of cerebellar Purkinje and granule neurons remains unclear. ATM expression is enriched in microglia throughout cerebellar development and adulthood. Here, we find evidence of microglial inflammation in the cerebellum of patients with A-T using single-nucleus RNA sequencing. Pseudotime analysis revealed that activation of A-T microglia preceded upregulation of apoptosis-related genes in granule and Purkinje neurons and that microglia exhibited increased neurotoxic cytokine signaling to granule and Purkinje neurons in A-T. To confirm these findings experimentally, we performed transcriptomic profiling of A-T induced pluripotent stem cell (iPSC)-derived microglia, which revealed cell-intrinsic microglial activation of cytokine production and innate immune response pathways compared to controls. Furthermore, A-T microglia co-culture with either control or A-T iPSC-derived neurons was sufficient to induce cytotoxicity. Taken together, these studies reveal that cell-intrinsic microglial activation may promote neurodegeneration in A-T.
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Affiliation(s)
- Jenny Lai
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Program in Neuroscience, Harvard University, Boston, MA 02115, USA
| | - Didem Demirbas
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Junho Kim
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Ailsa M Jeffries
- Department of Molecular, Cell, and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Allie Tolles
- Department of Molecular, Cell, and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Junseok Park
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Thomas W Chittenden
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; Computational Statistics and Bioinformatics Group, Genuity AI Research Institute, Genuity Science, Boston, MA 02114, USA
| | | | - Timothy W Yu
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Michael A Lodato
- Department of Molecular, Cell, and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
| | - Eunjung Alice Lee
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.
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9
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Olmos V, Thompson EN, Gogia N, Luttik K, Veeranki V, Ni L, Sim S, Chen K, Krause DS, Lim J. Dysregulation of alternative splicing in spinocerebellar ataxia type 1. Hum Mol Genet 2024; 33:138-149. [PMID: 37802886 PMCID: PMC10979408 DOI: 10.1093/hmg/ddad170] [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: 06/30/2023] [Revised: 09/29/2023] [Accepted: 10/02/2023] [Indexed: 10/08/2023] Open
Abstract
Spinocerebellar ataxia type 1 is caused by an expansion of the polyglutamine tract in ATAXIN-1. Ataxin-1 is broadly expressed throughout the brain and is involved in regulating gene expression. However, it is not yet known if mutant ataxin-1 can impact the regulation of alternative splicing events. We performed RNA sequencing in mouse models of spinocerebellar ataxia type 1 and identified that mutant ataxin-1 expression abnormally leads to diverse splicing events in the mouse cerebellum of spinocerebellar ataxia type 1. We found that the diverse splicing events occurred in a predominantly cell autonomous manner. A majority of the transcripts with misregulated alternative splicing events were previously unknown, thus allowing us to identify overall new biological pathways that are distinctive to those affected by differential gene expression in spinocerebellar ataxia type 1. We also provide evidence that the splicing factor Rbfox1 mediates the effect of mutant ataxin-1 on misregulated alternative splicing and that genetic manipulation of Rbfox1 expression modifies neurodegenerative phenotypes in a Drosophila model of spinocerebellar ataxia type 1 in vivo. Together, this study provides novel molecular mechanistic insight into the pathogenesis of spinocerebellar ataxia type 1 and identifies potential therapeutic strategies for spinocerebellar ataxia type 1.
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Affiliation(s)
- Victor Olmos
- Department of Genetics, Yale School of Medicine, 295 Congress Avenue, New Haven, CT 06510, United States
| | - Evrett N Thompson
- Department of Cell Biology, Yale School of Medicine, 10 Amistad Street, New Haven, CT 06510, United States
- Yale Stem Cell Center, Yale School of Medicine, 10 Amistad Street, New Haven, CT 06510, United States
| | - Neha Gogia
- Department of Genetics, Yale School of Medicine, 295 Congress Avenue, New Haven, CT 06510, United States
| | - Kimberly Luttik
- Interdepartmental Neuroscience Program, Yale School of Medicine, 295 Congress Avenue, New Haven, CT 06510, United States
- Department of Neuroscience, Yale School of Medicine, 295 Congress Avenue, New Haven, CT 06510, USA
| | - Vaishnavi Veeranki
- Department of Genetics, Yale School of Medicine, 295 Congress Avenue, New Haven, CT 06510, United States
| | - Luhan Ni
- Department of Genetics, Yale School of Medicine, 295 Congress Avenue, New Haven, CT 06510, United States
| | - Serena Sim
- Yale College, 433 Temple Street, New Haven, CT 06510, United States
| | - Kelly Chen
- Yale College, 433 Temple Street, New Haven, CT 06510, United States
| | - Diane S Krause
- Department of Cell Biology, Yale School of Medicine, 10 Amistad Street, New Haven, CT 06510, United States
- Yale Stem Cell Center, Yale School of Medicine, 10 Amistad Street, New Haven, CT 06510, United States
- Department of Pathology, Yale School of Medicine, 10 Amistad Street, New Haven, CT 06510, United States
- Department of Laboratory Medicine, Yale School of Medicine, 10 Amistad Street, New Haven, CT 06510, United States
| | - Janghoo Lim
- Department of Genetics, Yale School of Medicine, 295 Congress Avenue, New Haven, CT 06510, United States
- Yale Stem Cell Center, Yale School of Medicine, 10 Amistad Street, New Haven, CT 06510, United States
- Interdepartmental Neuroscience Program, Yale School of Medicine, 295 Congress Avenue, New Haven, CT 06510, United States
- Department of Neuroscience, Yale School of Medicine, 295 Congress Avenue, New Haven, CT 06510, USA
- Program in Cellular Neuroscience, Neurodegeneration, and Repair, Yale School of Medicine, 295 Congress Avenue, New Haven, CT 06510, United States
- Wu Tsai Institute, Yale School of Medicine, 100 College, New Haven, CT 06510, United States
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10
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Kleyner R, Ung N, Arif M, Marchi E, Amble K, Gavin M, Madrid R, Lyon G. ITPR1-associated spinocerebellar ataxia with craniofacial features-additional evidence for germline mosaicism. Cold Spring Harb Mol Case Stud 2023; 9:a006303. [PMID: 37821226 PMCID: PMC10815276 DOI: 10.1101/mcs.a006303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 10/02/2023] [Indexed: 10/13/2023] Open
Abstract
Inositol 1,4,5-triphosphate receptor type 1 (ITPR1) is an endoplasmic reticulum-bound intracellular inositol triphosphate receptor involved in the regulation of intracellular calcium. Pathogenic variants in ITPR1 are associated with spinocerebellar ataxia (SCA) types 15/16 and 29 and have recently been implicated in a facial microsomia syndrome. In this report, we present a family with three affected individuals found to have a heterozygous missense c.800C > T (predicted p.Thr267Met) who present clinically with a SCA29-like syndrome. All three individuals presented with varying degrees of ataxia, developmental delay, and apparent intellectual disability, as well as craniofacial involvement-an uncommon finding in patients with SCA29. The variant was identified using clinical exome sequencing and validated with Sanger sequencing. It is presumed to be inherited via parental germline mosaicism. We present our findings to provide additional evidence for germline mosaic inheritance of SCA29, as well as to expand the clinical phenotype of the syndrome.
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Affiliation(s)
- Robert Kleyner
- Department of Human Genetics, NYS Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314, USA
- Department of Neurological Surgery, Renaissance School of Medicine at Stony Brook University, Stony Brook, New York 11794-8122, USA
| | - Nathaniel Ung
- Department of Human Genetics, NYS Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314, USA
| | - Mohammad Arif
- Department of Human Genetics, NYS Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314, USA
- Division of Cytogenetics and Molecular Pathology, North Shore University Hospital, Manhasset, New York 11030, USA
| | - Elaine Marchi
- Department of Human Genetics, NYS Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314, USA
| | - Karen Amble
- George A. Jervis Clinic, NYS Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314, USA
| | - Maureen Gavin
- George A. Jervis Clinic, NYS Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314, USA
| | - Ricardo Madrid
- George A. Jervis Clinic, NYS Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314, USA
| | - Gholson Lyon
- Department of Human Genetics, NYS Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314, USA;
- George A. Jervis Clinic, NYS Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314, USA
- Biology PhD Program, The Graduate Center, The City University of New York, New York, New York 10016, USA
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11
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Huang H, Shakkottai VG. Targeting Ion Channels and Purkinje Neuron Intrinsic Membrane Excitability as a Therapeutic Strategy for Cerebellar Ataxia. Life (Basel) 2023; 13:1350. [PMID: 37374132 DOI: 10.3390/life13061350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 06/03/2023] [Accepted: 06/06/2023] [Indexed: 06/29/2023] Open
Abstract
In degenerative neurological disorders such as Parkinson's disease, a convergence of widely varying insults results in a loss of dopaminergic neurons and, thus, the motor symptoms of the disease. Dopamine replacement therapy with agents such as levodopa is a mainstay of therapy. Cerebellar ataxias, a heterogeneous group of currently untreatable conditions, have not been identified to have a shared physiology that is a target of therapy. In this review, we propose that perturbations in cerebellar Purkinje neuron intrinsic membrane excitability, a result of ion channel dysregulation, is a common pathophysiologic mechanism that drives motor impairment and vulnerability to degeneration in cerebellar ataxias of widely differing genetic etiologies. We further propose that treatments aimed at restoring Purkinje neuron intrinsic membrane excitability have the potential to be a shared therapy in cerebellar ataxia akin to levodopa for Parkinson's disease.
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Affiliation(s)
- Haoran Huang
- Medical Scientist Training Program, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | - Vikram G Shakkottai
- Department of Neurology, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
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12
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Terry LE, Arige V, Neumann J, Wahl AM, Knebel TR, Chaffer JW, Malik S, Liston A, Humblet-Baron S, Bultynck G, Yule DI. Missense mutations in inositol 1,4,5-trisphosphate receptor type 3 result in leaky Ca 2+ channels and activation of store-operated Ca 2+ entry. iScience 2022; 25:105523. [PMID: 36444295 PMCID: PMC9700043 DOI: 10.1016/j.isci.2022.105523] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 10/10/2022] [Accepted: 11/04/2022] [Indexed: 11/09/2022] Open
Abstract
Mutations in all subtypes of the inositol 1,4,5-trisphosphate receptor Ca2+ release channel are associated with human diseases. In this report, we investigated the functionality of three neuropathy-associated missense mutations in IP3R3 (V615M, T1424M, and R2524C). The mutants only exhibited function when highly over-expressed compared to endogenous hIP3R3. All variants resulted in elevated basal cytosolic Ca2+ levels, decreased endoplasmic reticulum Ca2+ store content, and constitutive store-operated Ca2+ entry in the absence of any stimuli, consistent with a leaky IP3R channel pore. These variants differed in channel function; when stably over-expressed the R2524C mutant was essentially dead, V615M was poorly functional, and T1424M exhibited activity greater than that of the corresponding wild-type following threshold stimulation. These results demonstrate that a common feature of these mutations is decreased IP3R3 function. In addition, these mutations exhibit a novel phenotype manifested as a constitutively open channel, which inappropriately gates SOCE in the absence of stimulation.
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Affiliation(s)
- Lara E. Terry
- Department of Pharmacology and Physiology, University of Rochester, Rochester, NY 14642, USA
| | - Vikas Arige
- Department of Pharmacology and Physiology, University of Rochester, Rochester, NY 14642, USA
| | - Julika Neumann
- KU Leuven, Department of Microbiology and Immunology, Leuven, Belgium
| | - Amanda M. Wahl
- Department of Pharmacology and Physiology, University of Rochester, Rochester, NY 14642, USA
| | - Taylor R. Knebel
- Department of Pharmacology and Physiology, University of Rochester, Rochester, NY 14642, USA
| | - James W. Chaffer
- Department of Pharmacology and Physiology, University of Rochester, Rochester, NY 14642, USA
| | - Sundeep Malik
- Department of Pharmacology and Physiology, University of Rochester, Rochester, NY 14642, USA
| | - Adrian Liston
- KU Leuven, Department of Microbiology and Immunology, Leuven, Belgium
| | | | - Geert Bultynck
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Leuven, Belgium
| | - David I. Yule
- Department of Pharmacology and Physiology, University of Rochester, Rochester, NY 14642, USA
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13
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Yeh SJ, Chen BS. Systems Medicine Design based on Systems Biology Approaches and Deep Neural Network for Gastric Cancer. IEEE/ACM TRANSACTIONS ON COMPUTATIONAL BIOLOGY AND BIOINFORMATICS 2022; 19:3019-3031. [PMID: 34232888 DOI: 10.1109/tcbb.2021.3095369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Gastric cancer (GC) is the third leading cause of cancer death in the world. It is associated with the stimulation of microenvironment, aberrant epigenetic modification, and chronic inflammation. However, few researches discuss the GC molecular progression mechanisms from the perspective of the system level. In this study, we proposed a systems medicine design procedure to identify essential biomarkers and find corresponding drugs for GC. At first, we did big database mining to construct candidate protein-protein interaction network (PPIN) and candidate gene regulation network (GRN). Second, by leveraging the next-generation sequencing (NGS) data, we performed system modeling and applied system identification and model selection to obtain real genome-wide genetic and epigenetic networks (GWGENs). To make the real GWGENs easy to analyze, the principal network projection method was used to extract the core signaling pathways denoted by KEGG pathways. Subsequently, based on the identified biomarkers, we trained a deep neural network of drug-target interaction (DeepDTI) with supervised learning and filtered our candidate drugs considering drug regulation ability and drug sensitivity. With the proposed systematic strategy, we not only shed the light on the progression of GC but also suggested potential multiple-molecule drugs efficiently.
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14
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Wu QW, Kapfhammer JP. The Emerging Key Role of the mGluR1-PKCγ Signaling Pathway in the Pathogenesis of Spinocerebellar Ataxias: A Neurodevelopmental Viewpoint. Int J Mol Sci 2022; 23:ijms23169169. [PMID: 36012439 PMCID: PMC9409119 DOI: 10.3390/ijms23169169] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 08/11/2022] [Accepted: 08/12/2022] [Indexed: 12/19/2022] Open
Abstract
Spinocerebellar ataxias (SCAs) are a heterogeneous group of autosomal dominantly inherited progressive disorders with degeneration and dysfunction of the cerebellum. Although different subtypes of SCAs are classified according to the disease-associated causative genes, the clinical syndrome of the ataxia is shared, pointing towards a possible convergent pathogenic pathway among SCAs. In this review, we summarize the role of SCA-associated gene function during cerebellar Purkinje cell development and discuss the relationship between SCA pathogenesis and neurodevelopment. We will summarize recent studies on molecules involved in SCA pathogenesis and will focus on the mGluR1-PKCγ signaling pathway evaluating the possibility that this might be a common pathway which contributes to these diseases.
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15
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Superior Cerebellar Atrophy: An Imaging Clue to Diagnose ITPR1-Related Disorders. Int J Mol Sci 2022; 23:ijms23126723. [PMID: 35743164 PMCID: PMC9223788 DOI: 10.3390/ijms23126723] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 06/13/2022] [Accepted: 06/14/2022] [Indexed: 02/04/2023] Open
Abstract
The inositol 1,4,5-triphosphate receptor type 1 (ITPR1) gene encodes an InsP3-gated calcium channel that modulates intracellular Ca2+ release and is particularly expressed in cerebellar Purkinje cells. Pathogenic variants in the ITPR1 gene are associated with different types of autosomal dominant spinocerebellar ataxia: SCA15 (adult onset), SCA29 (early-onset), and Gillespie syndrome. Cerebellar atrophy/hypoplasia is invariably detected, but a recognizable neuroradiological pattern has not been identified yet. With the aim of describing ITPR1-related neuroimaging findings, the brain MRI of 14 patients with ITPR1 variants (11 SCA29, 1 SCA15, and 2 Gillespie) were reviewed by expert neuroradiologists. To further evaluate the role of superior vermian and hemispheric cerebellar atrophy as a clue for the diagnosis of ITPR1-related conditions, the ITPR1 gene was sequenced in 5 patients with similar MRI pattern, detecting pathogenic variants in 4 of them. Considering the whole cohort, a distinctive neuroradiological pattern consisting in superior vermian and hemispheric cerebellar atrophy was identified in 83% patients with causative ITPR1 variants, suggesting this MRI finding could represent a hallmark for ITPR1-related disorders.
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16
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Subramony SH, Burns M, Kugelmann EL, Zingariello CD. Inherited Ataxias in Children. Pediatr Neurol 2022; 131:54-62. [PMID: 35490578 DOI: 10.1016/j.pediatrneurol.2022.04.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 03/28/2022] [Accepted: 04/01/2022] [Indexed: 10/18/2022]
Abstract
The purpose of this review is to describe the current diagnostic approach to inherited ataxias during childhood. With the expanding use and availability of gene testing technologies including large sequencing panels, the ability to arrive at a precise genetic diagnosis in this group of disorders has been improving. We have reviewed all the gene sequencing studies of ataxias available by a comprehensive literature search and summarize their results. We provide a logical algorithm for a diagnostic approach in the context of this evolving information. We stress the fact that both autosomal recessive and autosomal dominant mutations can occur in children with ataxias and the need for keeping in mind nucleotide repeat expansions, which cannot be detected by sequencing technologies, as a possible cause of progressive ataxias in children. We discuss the traditional phenotype-based diagnostic approach in the context of gene testing technologies. Finally, we summarize those disorders in which a specific therapy may be indicated.
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Affiliation(s)
- Sub H Subramony
- Department of Neurology, University of Florida College of Medicine, Gainesville, Florida; Department of Pediatrics, University of Florida College of Medicine, Gainesville, Florida.
| | - Matthew Burns
- Department of Neurology, University of Florida College of Medicine, Gainesville, Florida
| | - E Lee Kugelmann
- Department of Neurology, University of Florida College of Medicine, Gainesville, Florida
| | - Carla D Zingariello
- Department of Pediatrics, University of Florida College of Medicine, Gainesville, Florida
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17
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Zachou A, Palaiologou D, Kanavakis E, Anagnostou E. Retrocollis as the cardinal feature in a de novo ITRP1 variant. Brain Dev 2022; 44:347-352. [PMID: 35148930 DOI: 10.1016/j.braindev.2022.01.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 01/15/2022] [Accepted: 01/17/2022] [Indexed: 11/18/2022]
Abstract
BACKGROUND ITPR1 gene encodes inositol 1,4,5-trisphosphate-receptor-type 1, a Ca2+ channel highly expressed in cerebellar Purkinje cells. ITPR1 gene variants, through a loss-of-function mechanism, have been found to be related with the manifestation of spinocerebellar ataxia (SCA) 15, an adult-onset slow progressive cerebellar ataxia, SCA 29, a rare non-progressive congenital cerebellar ataxia and Gillepsie syndrome (SCA 29 phenotype plus aniridia). They share an heterogeneity of additional phenotypic features while no genotype-phenotype correlation has ever been found. CASE REPORT Here we report the case of a boy with cerebellar ataxia who came to our clinic due to his cervical dystonia in the form of retrocollis. He presented an early-onset, non-progressive cerebellar ataxia, with cognitive impairment and delayed motor milestones. Whole exome sequencing (WES) revealed an heterozygous nucleotide variation, c.829A > C (p.Ser277Arg) in ITPR1 gene (NM_001168272.1), a de novo ITPR1 variant, as his parents came up with negative genetic testing. Due to his clinical presentation and genetic result, we came up with the diagnosis of SCA 29. CONCLUSION We described cervical dystonia as a phenotypic feature of ITPR1 related SCA 29, found in a new de novo ITPR1-variant.
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Affiliation(s)
- Athena Zachou
- Department of Neurology, Eginition Hospital, National and Kapodistrian University of Athens, Greece.
| | - Danai Palaiologou
- Genesis Genoma Lab, Genetic Diagnosis, Clinical Genetics & Research, Athens, Greece
| | - Emmanouil Kanavakis
- Genesis Genoma Lab, Genetic Diagnosis, Clinical Genetics & Research, Athens, Greece
| | - Evangelos Anagnostou
- Department of Neurology, Eginition Hospital, National and Kapodistrian University of Athens, Greece
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18
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The IGSF1, Wnt5a, FGF14, and ITPR1 Gene Expression and Prognosis Hallmark of Prostate Cancer. Rep Biochem Mol Biol 2022; 11:44-53. [PMID: 35765527 PMCID: PMC9208564 DOI: 10.52547/rbmb.11.1.44] [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: 09/08/2021] [Accepted: 09/29/2021] [Indexed: 01/11/2023]
Abstract
Background Prostate cancer is considered as the second leading cause of cancer related death in men worldwide and the third frequent cancer among Iranian men. Despite the use of PSA as the only biomarker for early diagnosis of prostate cancer, its application in clinical settings is under debate. Therefore, the introduction of new molecular markers for early detection of prostate cancer is needed. Methods In the present study we intended to evaluate the expression of IGSF1, Wnt5a, FGF14, and ITPR1 in prostate cancer specimens by real time PCR. Biopsy samples of 40 prostate cancer cases and 41 healthy Iranian men were compared to determine the relative gene expression of IGSF1, Wnt5a, FGF14, and ITPR1 by real time PCR. Results Our results showed that Wnt5a, FGF14, and IGSF1 were significantly overexpressed in the prostate cancer patients while the mean relative expression of ITPR1 showed a significant decrease in PCa samples compared to healthy controls. Conclusion According to results of the present study, the combination panel of IGSF1, Wnt5a, FGF14, and ITPR1 genes could be considered as potential genetic markers for prostate cancer diagnosis. However further studies on larger populations and investigating the clinicopathological relevance of these genes is needed.
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19
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Regulation of Aging and Longevity by Ion Channels and Transporters. Cells 2022; 11:cells11071180. [PMID: 35406743 PMCID: PMC8997527 DOI: 10.3390/cells11071180] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 03/22/2022] [Accepted: 03/29/2022] [Indexed: 12/10/2022] Open
Abstract
Despite significant advances in our understanding of the mechanisms that underlie age-related physiological decline, our ability to translate these insights into actionable strategies to extend human healthspan has been limited. One of the major reasons for the existence of this barrier is that with a few important exceptions, many of the proteins that mediate aging have proven to be undruggable. The argument put forth here is that the amenability of ion channels and transporters to pharmacological manipulation could be leveraged to develop novel therapeutic strategies to combat aging. This review delves into the established roles for ion channels and transporters in the regulation of aging and longevity via their influence on membrane excitability, Ca2+ homeostasis, mitochondrial and endolysosomal function, and the transduction of sensory stimuli. The goal is to provide the reader with an understanding of emergent themes, and prompt further investigation into how the activities of ion channels and transporters sculpt the trajectories of cellular and organismal aging.
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20
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Huang L, Warman-Chardon J, Carter MT, Friend KL, Dudding TE, Schwartzentruber J, Zou R, Schofield PW, Douglas S, Bulman DE, Boycott KM. Correction to: Missense mutations in ITPR1 cause autosomal dominant congenital nonprogressive spinocerebellar ataxia. Orphanet J Rare Dis 2022; 17:143. [PMID: 35351177 PMCID: PMC8966260 DOI: 10.1186/s13023-022-02297-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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21
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Golgi Metal Ion Homeostasis in Human Health and Diseases. Cells 2022; 11:cells11020289. [PMID: 35053405 PMCID: PMC8773785 DOI: 10.3390/cells11020289] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/31/2021] [Accepted: 01/11/2022] [Indexed: 12/24/2022] Open
Abstract
The Golgi apparatus is a membrane organelle located in the center of the protein processing and trafficking pathway. It consists of sub-compartments with distinct biochemical compositions and functions. Main functions of the Golgi, including membrane trafficking, protein glycosylation, and sorting, require a well-maintained stable microenvironment in the sub-compartments of the Golgi, along with metal ion homeostasis. Metal ions, such as Ca2+, Mn2+, Zn2+, and Cu2+, are important cofactors of many Golgi resident glycosylation enzymes. The homeostasis of metal ions in the secretory pathway, which is required for proper function and stress response of the Golgi, is tightly regulated and maintained by transporters. Mutations in the transporters cause human diseases. Here we provide a review specifically focusing on the transporters that maintain Golgi metal ion homeostasis under physiological conditions and their alterations in diseases.
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22
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Edara VV, Manning KE, Ellis M, Lai L, Moore KM, Foster SL, Floyd K, Davis-Gardner ME, Mantus G, Nyhoff LE, Bechnak S, Alaaeddine G, Naji A, Samaha H, Lee M, Bristow L, Hussaini L, Ciric CR, Nguyen PV, Gagne M, Roberts-Torres J, Henry AR, Godbole S, Grakoui A, Sexton M, Piantadosi A, Waggoner JJ, Douek DC, Anderson EJ, Rouphael N, Wrammert J, Suthar MS. mRNA-1273 and BNT162b2 mRNA vaccines have reduced neutralizing activity against the SARS-CoV-2 Omicron variant. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2021. [PMID: 34981056 DOI: 10.1101/2021.09.09.459619] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The BNT162b2 (Pfizer-BioNTech) and mRNA-1273 (Moderna) vaccines generate potent neutralizing antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). However, the global emergence of SARS-CoV-2 variants with mutations in the spike protein, the principal antigenic target of these vaccines, has raised concerns over the neutralizing activity of vaccine-induced antibody responses. The Omicron variant, which emerged in November 2021, consists of over 30 mutations within the spike protein. Here, we used an authentic live virus neutralization assay to examine the neutralizing activity of the SARS-CoV-2 Omicron variant against mRNA vaccine-induced antibody responses. Following the 2nd dose, we observed a 30-fold reduction in neutralizing activity against the omicron variant. Through six months after the 2nd dose, none of the sera from naïve vaccinated subjects showed neutralizing activity against the Omicron variant. In contrast, recovered vaccinated individuals showed a 22-fold reduction with more than half of the subjects retaining neutralizing antibody responses. Following a booster shot (3rd dose), we observed a 14-fold reduction in neutralizing activity against the omicron variant and over 90% of boosted subjects showed neutralizing activity against the omicron variant. These findings show that a 3rd dose is required to provide robust neutralizing antibody responses against the Omicron variant.
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23
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Gastrointestinal Dysmotility Is a Significant Feature in 2 Siblings With a Novel Inositol 1,4,5-Triphosphate Receptor 1 ( ITPR1) Missense Variant. ACG Case Rep J 2021; 8:e00676. [PMID: 34722792 PMCID: PMC8549690 DOI: 10.14309/crj.0000000000000676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 06/21/2021] [Indexed: 11/25/2022] Open
Abstract
We present 2 siblings with a novel type 1 inositol 1,4,5-triphosphate receptor (ITPR1) missense variant who exhibit gastrointestinal dysmotility (chronic constipation and gastroparesis). ITPR1 is expressed in the cerebellum and interstitial cells of Cajal. Periodic release of calcium by ITPR1 initiates pacemaker currents, resulting in smooth muscle contraction. ITPR1 mutations are known to be associated with neurologic syndromes, and these variants have not previously been associated with significant gastrointestinal manifestations in humans. Using whole-genome sequencing, in silico prediction software, biopsy samples, and manometry, the identified novel ITPR1 variant is likely pathogenic and may have neurogastroenterology implications.
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24
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Kinoshita A, Ohyama K, Tanimura S, Matsuda K, Kishino T, Negishi Y, Asahina N, Shiraishi H, Hosoki K, Tomiwa K, Ishihara N, Mishima H, Mori R, Nakashima M, Saitoh S, Yoshiura KI. Itpr1 regulates the formation of anterior eye segment tissues derived from neural crest cells. Development 2021; 148:271160. [PMID: 34338282 DOI: 10.1242/dev.188755] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 07/19/2021] [Indexed: 01/23/2023]
Abstract
Mutations in ITPR1 cause ataxia and aniridia in individuals with Gillespie syndrome (GLSP). However, the pathogenic mechanisms underlying aniridia remain unclear. We identified a de novo GLSP mutation hotspot in the 3'-region of ITPR1 in five individuals with GLSP. Furthermore, RNA-sequencing and immunoblotting revealed an eye-specific transcript of Itpr1, encoding a 218amino acid isoform. This isoform is localized not only in the endoplasmic reticulum, but also in the nuclear and cytoplasmic membranes. Ocular-specific transcription was repressed by SOX9 and induced by MAF in the anterior eye segment (AES) tissues. Mice lacking seven base pairs of the last Itpr1 exon exhibited ataxia and aniridia, in which the iris lymphatic vessels, sphincter and dilator muscles, corneal endothelium and stroma were disrupted, but the neural crest cells persisted after completion of AES formation. Our analyses revealed that the 218-amino acid isoform regulated the directionality of actin fibers and the intensity of focal adhesion. The isoform might control the nuclear entry of transcriptional regulators, such as YAP. It is also possible that ITPR1 regulates both AES differentiation and muscle contraction in the iris.
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Affiliation(s)
- Akira Kinoshita
- Department of Human Genetics, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki 852-8523, Japan
| | - Kaname Ohyama
- Department of Pharmacy Practice, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-3131, Japan
| | - Susumu Tanimura
- Department of Cell Regulation, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-3131, Japan
| | - Katsuya Matsuda
- Department of Tumor and Diagnostic Pathology, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki 852-8523, Japan
| | - Tatsuya Kishino
- Gene Research Center, Center for Frontier Life Sciences, Nagasaki University, Nagasaki 852-8523, Japan
| | - Yutaka Negishi
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya 467-8602, Japan
| | - Naoko Asahina
- Department of Pediatrics, Hokkaido University Graduate School of Medicine, Sapporo 060-8638, Japan
| | - Hideaki Shiraishi
- Department of Pediatrics, Hokkaido University Graduate School of Medicine, Sapporo 060-8638, Japan
| | - Kana Hosoki
- Department of Medical Genetics, Osaka Women's and Children's Hospital, Osaka 594-1101, Japan
| | - Kiyotaka Tomiwa
- Department of Pediatrics, Todaiji Ryoiku Hospital for Children, Nara 630-8211, Japan
| | - Naoko Ishihara
- Department of Pediatrics, Fujita Health University School of Medicine, Toyoake 470-1192, Japan
| | - Hiroyuki Mishima
- Department of Human Genetics, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki 852-8523, Japan
| | - Ryoichi Mori
- Department of Pathology, Nagasaki University School of Medicine and Graduate School of Biomedical Sciences, Nagasaki 852-8523, Japan
| | - Masahiro Nakashima
- Department of Tumor and Diagnostic Pathology, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki 852-8523, Japan
| | - Shinji Saitoh
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya 467-8602, Japan
| | - Koh-Ichiro Yoshiura
- Department of Human Genetics, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki 852-8523, Japan
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25
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The Parkinson's disease-associated gene ITPKB protects against α-synuclein aggregation by regulating ER-to-mitochondria calcium release. Proc Natl Acad Sci U S A 2021; 118:2006476118. [PMID: 33443159 PMCID: PMC7817155 DOI: 10.1073/pnas.2006476118] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Parkinson’s disease (PD) is the second most prevalent neurodegenerative disease of aging, affecting approximately 10 million patients worldwide with no approved therapies to modify progression of disease. Further understanding of the cellular mechanisms contributing to the development of PD is necessary to discover therapies. Here, we characterize the role of a recently identified GWAS hit for sporadic PD, ITPKB, in the aggregation of α-synuclein, the primary pathological feature of disease. These results identify inhibition of inositol-1,4,5,-triphosphate (IP3)-mediated ER-to-mitochondria calcium release as a potential therapeutic approach for reducing neuropathology in PD. Inositol-1,4,5-triphosphate (IP3) kinase B (ITPKB) is a ubiquitously expressed lipid kinase that inactivates IP3, a secondary messenger that stimulates calcium release from the endoplasmic reticulum (ER). Genome-wide association studies have identified common variants in the ITPKB gene locus associated with reduced risk of sporadic Parkinson’s disease (PD). Here, we investigate whether ITPKB activity or expression level impacts PD phenotypes in cellular and animal models. In primary neurons, knockdown or pharmacological inhibition of ITPKB increased levels of phosphorylated, insoluble α-synuclein pathology following treatment with α-synuclein preformed fibrils (PFFs). Conversely, ITPKB overexpression reduced PFF-induced α-synuclein aggregation. We also demonstrate that ITPKB inhibition or knockdown increases intracellular calcium levels in neurons, leading to an accumulation of calcium in mitochondria that increases respiration and inhibits the initiation of autophagy, suggesting that ITPKB regulates α-synuclein pathology by inhibiting ER-to-mitochondria calcium transport. Furthermore, the effects of ITPKB on mitochondrial calcium and respiration were prevented by pretreatment with pharmacological inhibitors of the mitochondrial calcium uniporter complex, which was also sufficient to reduce α-synuclein pathology in PFF-treated neurons. Taken together, these results identify ITPKB as a negative regulator of α-synuclein aggregation and highlight modulation of ER-to-mitochondria calcium flux as a therapeutic strategy for the treatment of sporadic PD.
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26
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Keehan L, Jiang MM, Li X, Marom R, Dai H, Murdock D, Liu P, Hunter JV, Heaney JD, Robak L, Emrick L, Lotze T, Blieden LS, Lewis RA, Levin AV, Capasso J, Craigen WJ, Rosenfeld JA, Lee B, Burrage LC. A novel de novo intronic variant in ITPR1 causes Gillespie syndrome. Am J Med Genet A 2021; 185:2315-2324. [PMID: 33949769 DOI: 10.1002/ajmg.a.62232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 04/01/2021] [Indexed: 11/07/2022]
Abstract
Gillespie syndrome (GLSP) is characterized by bilateral symmetric partial aplasia of the iris presenting as a fixed and large pupil, cerebellar hypoplasia with ataxia, congenital hypotonia, and varying levels of intellectual disability. GLSP is caused by either biallelic or heterozygous, dominant-negative, pathogenic variants in ITPR1. Here, we present a 5-year-old male with GLSP who was found to have a heterozygous, de novo intronic variant in ITPR1 (NM_001168272.1:c.5935-17G > A) through genome sequencing (GS). Sanger sequencing of cDNA from this individual's fibroblasts showed the retention of 15 nucleotides from intron 45, which is predicted to cause an in-frame insertion of five amino acids near the C-terminal transmembrane domain of ITPR1. In addition, qPCR and cDNA sequencing demonstrated reduced expression of both ITPR1 alleles in fibroblasts when compared to parental samples. Given the close proximity of the predicted in-frame amino acid insertion to the site of previously described heterozygous, de novo, dominant-negative, pathogenic variants in GLSP, we predict that this variant also has a dominant-negative effect on ITPR1 channel function. Overall, this is the first report of a de novo intronic variant causing GLSP, which emphasizes the utility of GS and cDNA studies for diagnosing patients with a clinical presentation of GLSP and negative clinical exome sequencing.
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Affiliation(s)
- Laura Keehan
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA
| | - Ming-Ming Jiang
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA
| | - Xiaohui Li
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA
| | - Ronit Marom
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Texas Children's Hospital, Houston, Texas, USA
| | - Hongzheng Dai
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Baylor Genetics, Houston, Texas, USA
| | - David Murdock
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA
| | - Pengfei Liu
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Baylor Genetics, Houston, Texas, USA
| | - Jill V Hunter
- Texas Children's Hospital, Houston, Texas, USA.,Department of Radiology, Baylor College of Medicine, Houston, Texas, USA
| | - Jason D Heaney
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA
| | - Laurie Robak
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Texas Children's Hospital, Houston, Texas, USA
| | - Lisa Emrick
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Texas Children's Hospital, Houston, Texas, USA.,Department of Pediatrics, Baylor College of Medicine (BCM), Houston, Texas, USA.,Division of Neurology and Developmental Neuroscience, Department of Pediatrics, BCM, Houston, Texas, USA
| | - Timothy Lotze
- Texas Children's Hospital, Houston, Texas, USA.,Department of Pediatrics, Baylor College of Medicine (BCM), Houston, Texas, USA.,Division of Neurology and Developmental Neuroscience, Department of Pediatrics, BCM, Houston, Texas, USA
| | - Lauren S Blieden
- Cullen Eye Institute, Department of Ophthalmology, Baylor College of Medicine, Houston, Texas, USA
| | | | - Richard Alan Lewis
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Texas Children's Hospital, Houston, Texas, USA.,Cullen Eye Institute, Department of Ophthalmology, Baylor College of Medicine, Houston, Texas, USA
| | - Alex V Levin
- Flaum Eye Institute and Golisano Children's Hospital, Departments of Ophthalmology and Pediatrics, University of Rochester, Rochester, New York, USA
| | - Jenina Capasso
- Flaum Eye Institute and Golisano Children's Hospital, Departments of Ophthalmology and Pediatrics, University of Rochester, Rochester, New York, USA
| | - William J Craigen
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Texas Children's Hospital, Houston, Texas, USA
| | - Jill A Rosenfeld
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA
| | - Brendan Lee
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Texas Children's Hospital, Houston, Texas, USA
| | - Lindsay C Burrage
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Texas Children's Hospital, Houston, Texas, USA
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27
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Lee JH, Ryu SW, Ender NA, Paull TT. Poly-ADP-ribosylation drives loss of protein homeostasis in ATM and Mre11 deficiency. Mol Cell 2021; 81:1515-1533.e5. [PMID: 33571423 DOI: 10.1016/j.molcel.2021.01.019] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 12/14/2020] [Accepted: 01/19/2021] [Indexed: 12/11/2022]
Abstract
Loss of the ataxia-telangiectasia mutated (ATM) kinase causes cerebellum-specific neurodegeneration in humans. We previously demonstrated that deficiency in ATM activation via oxidative stress generates insoluble protein aggregates in human cells, reminiscent of protein dysfunction in common neurodegenerative disorders. Here, we show that this process is driven by poly-ADP-ribose polymerases (PARPs) and that the insoluble protein species arise from intrinsically disordered proteins associating with PAR-associated genomic sites in ATM-deficient cells. The lesions implicated in this process are single-strand DNA breaks dependent on reactive oxygen species, transcription, and R-loops. Human cells expressing Mre11 A-T-like disorder mutants also show PARP-dependent aggregation identical to ATM deficiency. Lastly, analysis of A-T patient cerebellum samples shows widespread protein aggregation as well as loss of proteins known to be critical in human spinocerebellar ataxias that is not observed in neocortex tissues. These results provide a hypothesis accounting for loss of protein integrity and cerebellum function in A-T.
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Affiliation(s)
- Ji-Hoon Lee
- The University of Texas at Austin, Department of Molecular Biosciences, Austin, TX 78712, USA
| | - Seung W Ryu
- The University of Texas at Austin, Department of Molecular Biosciences, Austin, TX 78712, USA
| | - Nicolette A Ender
- The University of Texas at Austin, Department of Molecular Biosciences, Austin, TX 78712, USA
| | - Tanya T Paull
- The University of Texas at Austin, Department of Molecular Biosciences, Austin, TX 78712, USA.
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28
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Terry LE, Alzayady KJ, Wahl AM, Malik S, Yule DI. Disease-associated mutations in inositol 1,4,5-trisphosphate receptor subunits impair channel function. J Biol Chem 2020; 295:18160-18178. [PMID: 33093175 PMCID: PMC7939385 DOI: 10.1074/jbc.ra120.015683] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 10/21/2020] [Indexed: 01/27/2023] Open
Abstract
The inositol 1,4,5-trisphosphate (IP3) receptors (IP3Rs), which form tetrameric channels, play pivotal roles in regulating the spatiotemporal patterns of intracellular calcium signals. Mutations in IP3Rs have been increasingly associated with many debilitating human diseases such as ataxia, Gillespie syndrome, and generalized anhidrosis. However, how these mutations affect IP3R function, and how the perturbation of as-sociated calcium signals contribute to the pathogenesis and severity of these diseases remains largely uncharacterized. Moreover, many of these diseases occur as the result of autosomal dominant inheritance, suggesting that WT and mutant subunits associate in heterotetrameric channels. How the in-corporation of different numbers of mutant subunits within the tetrameric channels affects its activities and results in different disease phenotypes is also unclear. In this report, we investigated representative disease-associated missense mutations to determine their effects on IP3R channel activity. Additionally, we designed concatenated IP3R constructs to create tetrameric channels with a predefined subunit composition to explore the functionality of heteromeric channels. Using calcium imaging techniques to assess IP3R channel function, we observed that all the mutations studied resulted in severely attenuated Ca2+ release when expressed as homotetramers. However, some heterotetramers retained varied degrees of function dependent on the composition of the tetramer. Our findings suggest that the effect of mutations depends on the location of the mutation in the IP3R structure, as well as on the stoichiometry of mutant subunits assembled within the tetrameric channel. These studies provide insight into the pathogenesis and penetrance of these devastating human diseases.
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Affiliation(s)
- Lara E Terry
- Department of Pharmacology and Physiology, University of Rochester, Rochester, New York, USA
| | - Kamil J Alzayady
- Department of Pharmacology and Physiology, University of Rochester, Rochester, New York, USA
| | - Amanda M Wahl
- Department of Pharmacology and Physiology, University of Rochester, Rochester, New York, USA
| | - Sundeep Malik
- Department of Pharmacology and Physiology, University of Rochester, Rochester, New York, USA
| | - David I Yule
- Department of Pharmacology and Physiology, University of Rochester, Rochester, New York, USA.
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29
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Rönkkö J, Molchanova S, Revah‐Politi A, Pereira EM, Auranen M, Toppila J, Kvist J, Ludwig A, Neumann J, Bultynck G, Humblet‐Baron S, Liston A, Paetau A, Rivera C, Harms MB, Tyynismaa H, Ylikallio E. Dominant mutations in ITPR3 cause Charcot-Marie-Tooth disease. Ann Clin Transl Neurol 2020; 7:1962-1972. [PMID: 32949214 PMCID: PMC7545616 DOI: 10.1002/acn3.51190] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 08/24/2020] [Accepted: 08/24/2020] [Indexed: 01/09/2023] Open
Abstract
OBJECTIVE ITPR3, encoding inositol 1,4,5-trisphosphate receptor type 3, was previously reported as a potential candidate disease gene for Charcot-Marie-Tooth neuropathy. Here, we present genetic and functional evidence that ITPR3 is a Charcot-Marie-Tooth disease gene. METHODS Whole-exome sequencing of four affected individuals in an autosomal dominant family and one individual who was the only affected individual in his family was used to identify disease-causing variants. Skin fibroblasts from two individuals of the autosomal dominant family were analyzed functionally by western blotting, quantitative reverse transcription PCR, and Ca2+ imaging. RESULTS Affected individuals in the autosomal dominant family had onset of symmetrical neuropathy with demyelinating and secondary axonal features at around age 30, showing signs of gradual progression with severe distal leg weakness and hand involvement in the proband at age 64. Exome sequencing identified a heterozygous ITPR3 p.Val615Met variant segregating with the disease. The individual who was the only affected in his family had disease onset at age 4 with demyelinating neuropathy. His condition was progressive, leading to severe muscle atrophy below knees and atrophy of proximal leg and hand muscles by age 16. Trio exome sequencing identified a de novo ITPR3 variant p.Arg2524Cys. Altered Ca2+ -transients in p.Val615Met patient fibroblasts suggested that the variant has a dominant-negative effect on inositol 1,4,5-trisphosphate receptor type 3 function. INTERPRETATION Together with two previously identified variants, our report adds further evidence that ITPR3 is a disease-causing gene for CMT and indicates altered Ca2+ homeostasis in disease pathogenesis.
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Affiliation(s)
- Julius Rönkkö
- Stem Cells and Metabolism Research ProgramFaculty of MedicineUniversity of HelsinkiHelsinkiFinland
| | - Svetlana Molchanova
- Stem Cells and Metabolism Research ProgramFaculty of MedicineUniversity of HelsinkiHelsinkiFinland
- Molecular and Integrative Biosciences Research ProgramFaculty of Bio‐ and Environmental SciencesUniversity of HelsinkiHelsinkiFinland
| | - Anya Revah‐Politi
- Institute for Genomic MedicineColumbia University Medical CenterNew YorkNew YorkUSA
- Precision Genomics LaboratoryColumbia University Irving Medical CenterNew YorkNew YorkUSA
| | - Elaine M. Pereira
- Department of PediatricsColumbia University Irving Medical CenterNew YorkNew YorkUSA
| | - Mari Auranen
- Clinical NeurosciencesNeurologyUniversity of Helsinki and Helsinki University HospitalHelsinkiFinland
| | - Jussi Toppila
- Department of Clinical NeurophysiologyMedical Imaging CenterHelsinki University Central HospitalHelsinkiFinland
| | - Jouni Kvist
- Stem Cells and Metabolism Research ProgramFaculty of MedicineUniversity of HelsinkiHelsinkiFinland
| | - Anastasia Ludwig
- Neuroscience CenterHelsinki Institute of Life ScienceUniversity of HelsinkiHelsinkiFinland
| | - Julika Neumann
- Department of Microbiology and ImmunologyLaboratory of Adaptive ImmunityKU LeuvenLeuvenBelgium
- VIB‐KU Leuven Center for Brain and Disease ResearchLeuvenBelgium
| | - Geert Bultynck
- Laboratory of Molecular and Cellular SignalingDepartment of Cellular and Molecular Medicine & Leuven Kanker InstituutKU LeuvenLeuvenBelgium
| | | | - Adrian Liston
- Department of Microbiology and ImmunologyLaboratory of Adaptive ImmunityKU LeuvenLeuvenBelgium
- VIB‐KU Leuven Center for Brain and Disease ResearchLeuvenBelgium
- Laboratory of Lymphocyte Signalling and DevelopmentBabraham InstituteCambridgeUnited Kingdom
| | - Anders Paetau
- Department of PathologyHUSLAB and University of HelsinkiHelsinkiFinland
| | - Claudio Rivera
- Neuroscience CenterHelsinki Institute of Life ScienceUniversity of HelsinkiHelsinkiFinland
- Institut de Neurobiologie de la Méditerranée INMED UMR901MarseilleFrance
| | | | - Henna Tyynismaa
- Stem Cells and Metabolism Research ProgramFaculty of MedicineUniversity of HelsinkiHelsinkiFinland
- Neuroscience CenterHelsinki Institute of Life ScienceUniversity of HelsinkiHelsinkiFinland
- Department of Medical and Clinical GeneticsUniversity of HelsinkiHelsinkiFinland
| | - Emil Ylikallio
- Stem Cells and Metabolism Research ProgramFaculty of MedicineUniversity of HelsinkiHelsinkiFinland
- Clinical NeurosciencesNeurologyUniversity of Helsinki and Helsinki University HospitalHelsinkiFinland
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30
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Paternoster L, Soblet J, Aeby A, De Tiège X, Goldman S, Yue WW, Coppens S, Smits G, Vilain C, Deconinck N. Novel homozygous variant of carbonic anhydrase 8 gene expanding the phenotype of cerebellar ataxia, mental retardation, and disequilibrium syndrome subtype 3. Am J Med Genet A 2020; 182:2685-2693. [PMID: 32808436 DOI: 10.1002/ajmg.a.61805] [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: 04/07/2020] [Revised: 06/23/2020] [Accepted: 06/25/2020] [Indexed: 11/11/2022]
Abstract
We report the case of an 11-year-old Syrian girl born to consanguineous parents, who presents an ataxic gait from early childhood. On clinical examination, she presented a severe static - kinetic cerebellar syndrome, walking without support is possible for short distances only. Strikingly, three consecutive MRIs did not show any sign of cerebellar abnormalities, but a brain positron emission tomography (PET) using [18F]-fluorodeoxyglucose (FDG) demonstrated a clear decrease in glucose metabolism in the cerebellum as well as the anterior and medial temporal lobe bilaterally. A clinical exome analysis identified a novel homozygous c.251A > G (p.Asn84Ser) likely pathogenic variant in the carbonic anhydrase 8 (CA8) gene. CA8 mutations cause cerebellar ataxia, mental retardation, and disequilibrium syndrome subtype 3 (CAMRQ3), a rare genetically autosomal recessive disorder, only described in four families, so far with the frequent observation of quadrupedal gait. The proband differed with other reported CA8 mutations by the absence of clear cerebellar signs on brain MRI and the presence of focal seizures. This report expands the clinical spectrum associated with mutations in CA8 and illustrates the possible discrepancy between (mild) neuro-radiological images (MRI) and (severe) clinical phenotype in young individuals. In contrast, the observation of clear cerebellar abnormal metabolic findings suggests that the FDG-PET scan may be used as an early marker for hereditary ataxia.
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Affiliation(s)
- Lionel Paternoster
- Faculté de Médecine ULB, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Julie Soblet
- Department of Genetics, Hôpital Universitaire des Enfants Reine Fabiola, ULB Center of Human Genetics, Université Libre de Bruxelles (ULB), Brussels, Belgium.,Department of Genetics, Hôpital Erasme, ULB Center of Human Genetics, Université Libre de Bruxelles (ULB), Brussels, Belgium.,Interuniversity Institute of Bioinformatics in Brussels, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Alec Aeby
- Department of Pediatric Neurology, Hôpital Universitaire des Enfants Reine Fabiola, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Xavier De Tiège
- Department of Functional Neuroimaging, Service of Nuclear Medicine, CUB Hôpital Erasme, Université libre de Bruxelles (ULB), Brussels, Belgium.,Laboratoire de Cartographie fonctionnelle du Cerveau, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Serge Goldman
- Department of Functional Neuroimaging, Service of Nuclear Medicine, CUB Hôpital Erasme, Université libre de Bruxelles (ULB), Brussels, Belgium.,Laboratoire de Cartographie fonctionnelle du Cerveau, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Wyatt W Yue
- Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Sandra Coppens
- Department of Genetics, Hôpital Universitaire des Enfants Reine Fabiola, ULB Center of Human Genetics, Université Libre de Bruxelles (ULB), Brussels, Belgium.,Neuromuscular Reference Center, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Guillaume Smits
- Department of Genetics, Hôpital Universitaire des Enfants Reine Fabiola, ULB Center of Human Genetics, Université Libre de Bruxelles (ULB), Brussels, Belgium.,Department of Genetics, Hôpital Erasme, ULB Center of Human Genetics, Université Libre de Bruxelles (ULB), Brussels, Belgium.,Interuniversity Institute of Bioinformatics in Brussels, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Catheline Vilain
- Department of Genetics, Hôpital Universitaire des Enfants Reine Fabiola, ULB Center of Human Genetics, Université Libre de Bruxelles (ULB), Brussels, Belgium.,Department of Genetics, Hôpital Erasme, ULB Center of Human Genetics, Université Libre de Bruxelles (ULB), Brussels, Belgium.,Interuniversity Institute of Bioinformatics in Brussels, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Nicolas Deconinck
- Department of Pediatric Neurology, Hôpital Universitaire des Enfants Reine Fabiola, Université Libre de Bruxelles (ULB), Brussels, Belgium.,Neuromuscular Reference Center, Université Libre de Bruxelles (ULB), Brussels, Belgium
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31
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Ali A, Al-Tobasei R, Lourenco D, Leeds T, Kenney B, Salem M. Genome-wide scan for common variants associated with intramuscular fat and moisture content in rainbow trout. BMC Genomics 2020; 21:529. [PMID: 32736521 PMCID: PMC7393730 DOI: 10.1186/s12864-020-06932-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 07/20/2020] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Genetic improvement of fillet quality attributes is a priority of the aquaculture industry. Muscle composition impacts quality attributes such as flavor, appearance, texture, and juiciness. Fat and moisture make up about ~ 80% of the tissue weight. The genetic architecture underlying the fat and moisture content of the muscle is still to be fully explored in fish. A 50 K gene transcribed SNP chip was used for genotyping 789 fish with available phenotypic data for fat and moisture content. Genotyped fish were obtained from two consecutive generations produced in the National Center for Cool and Cold Water Aquaculture (NCCCWA) growth-selective breeding program. Estimates of SNP effects from weighted single-step GBLUP (WssGBLUP) were used to perform genome-wide association (GWA) analysis to identify quantitative trait loci (QTL) associated with the studied traits. RESULTS Using genomic sliding windows of 50 adjacent SNPs, 137 and 178 SNPs were identified as associated with fat and moisture content, respectively. Chromosomes 19 and 29 harbored the highest number of SNPs explaining at least 2% of the genetic variation in fat and moisture content. A total of 61 common SNPs on chromosomes 19 and 29 affected the aforementioned traits; this association suggests common mechanisms underlying intramuscular fat and moisture content. Additionally, based on single-marker GWA analyses, 8 and 24 SNPs were identified in association with fat and moisture content, respectively. CONCLUSION SNP-harboring genes were primarily involved in lipid metabolism, cytoskeleton remodeling, and protein turnover. This work provides putative SNP markers that could be prioritized and used for genomic selection in breeding programs.
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Affiliation(s)
- Ali Ali
- Department of Animal and Avian Sciences, University of Maryland, College Park, MD, 20742, USA
| | - Rafet Al-Tobasei
- Computational Science Program, Middle Tennessee State University, Murfreesboro, TN, 37132, USA
| | - Daniela Lourenco
- Department of Animal and Dairy Science, University of Georgia, Athens, GA, 30602, USA
| | - Tim Leeds
- National Center for Cool and Cold Water Aquaculture, Agricultural Research Service, United States Department of Agriculture, Kearneysville, WV, USA
| | - Brett Kenney
- Division of Animal and Nutritional Sciences, West Virginia University, Morgantown, WV, 26506, USA
| | - Mohamed Salem
- Department of Animal and Avian Sciences, University of Maryland, College Park, MD, 20742, USA.
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32
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Robinson KJ, Watchon M, Laird AS. Aberrant Cerebellar Circuitry in the Spinocerebellar Ataxias. Front Neurosci 2020; 14:707. [PMID: 32765211 PMCID: PMC7378801 DOI: 10.3389/fnins.2020.00707] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 06/11/2020] [Indexed: 12/11/2022] Open
Abstract
The spinocerebellar ataxias (SCAs) are a heterogeneous group of neurodegenerative diseases that share convergent disease features. A common symptom of these diseases is development of ataxia, involving impaired balance and motor coordination, usually stemming from cerebellar dysfunction and neurodegeneration. For most spinocerebellar ataxias, pathology can be attributed to an underlying gene mutation and the impaired function of the encoded protein through loss or gain-of-function effects. Strikingly, despite vast heterogeneity in the structure and function of disease-causing genes across the SCAs and the cellular processes affected, the downstream effects have considerable overlap, including alterations in cerebellar circuitry. Interestingly, aberrant function and degeneration of Purkinje cells, the major output neuronal population present within the cerebellum, precedes abnormalities in other neuronal populations within many SCAs, suggesting that Purkinje cells have increased vulnerability to cellular perturbations. Factors that are known to contribute to perturbed Purkinje cell function in spinocerebellar ataxias include altered gene expression resulting in altered expression or functionality of proteins and channels that modulate membrane potential, downstream impairments in intracellular calcium homeostasis and changes in glutamatergic input received from synapsing climbing or parallel fibers. This review will explore this enhanced vulnerability and the aberrant cerebellar circuitry linked with it in many forms of SCA. It is critical to understand why Purkinje cells are vulnerable to such insults and what overlapping pathogenic mechanisms are occurring across multiple SCAs, despite different underlying genetic mutations. Enhanced understanding of disease mechanisms will facilitate the development of treatments to prevent or slow progression of the underlying neurodegenerative processes, cerebellar atrophy and ataxic symptoms.
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Affiliation(s)
| | | | - Angela S. Laird
- Centre for Motor Neuron Disease Research, Department of Biomedical Science, Faculty of Medicine, Health and Human Sciences, Macquarie University, Sydney, NSW, Australia
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Cappuccio G, Apuzzo D, Passalacqua P, Parrini E, D'Amico A, Montini T, Brunetti‐Pierri N. Long‐term follow‐up of an individual with
ITPR1
‐related disorder. Am J Med Genet A 2020; 182:1846-1847. [DOI: 10.1002/ajmg.a.61609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 04/09/2020] [Accepted: 04/14/2020] [Indexed: 11/07/2022]
Affiliation(s)
- Gerarda Cappuccio
- Department of Translational Medicine Federico II University Naples Italy
- Telethon Institute of Genetics and Medicine Naples Italy
| | - Diletta Apuzzo
- Department of Translational Medicine Federico II University Naples Italy
| | | | - Elena Parrini
- Pediatric Neurology, Neurogenetics and Neurobiology Unit and Laboratories Children's Hospital Anna Meyer‐University of Florence Florence Italy
| | - Alessandra D'Amico
- Department of Advanced Biomedical Sciences Federico II University Naples Italy
| | | | - Nicola Brunetti‐Pierri
- Department of Translational Medicine Federico II University Naples Italy
- Telethon Institute of Genetics and Medicine Naples Italy
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34
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Rare CACNA1A mutations leading to congenital ataxia. Pflugers Arch 2020; 472:791-809. [DOI: 10.1007/s00424-020-02396-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 05/05/2020] [Accepted: 05/06/2020] [Indexed: 01/03/2023]
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35
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Tekola-Ayele F, Zhang C, Wu J, Grantz KL, Rahman ML, Shrestha D, Ouidir M, Workalemahu T, Tsai MY. Trans-ethnic meta-analysis of genome-wide association studies identifies maternal ITPR1 as a novel locus influencing fetal growth during sensitive periods in pregnancy. PLoS Genet 2020; 16:e1008747. [PMID: 32407400 PMCID: PMC7252673 DOI: 10.1371/journal.pgen.1008747] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 05/27/2020] [Accepted: 03/30/2020] [Indexed: 12/14/2022] Open
Abstract
Abnormal fetal growth is a risk factor for infant morbidity and mortality and is associated with cardiometabolic diseases in adults. Genetic influences on fetal growth can vary at different gestation times, but genome-wide association studies have been limited to birthweight. We performed trans-ethnic genome-wide meta-analyses and fine mapping to identify maternal genetic loci associated with fetal weight estimates obtained from ultrasound measures taken during pregnancy. Data included 1,849 pregnant women from four race/ethnic groups recruited through the NICHD Fetal Growth Studies. We identified a novel genome-wide significant association of rs746039 [G] (ITPR1) with reduced fetal weight from 24 to 33 weeks gestation (P<5x10-8; log10BF>6). Additional tests revealed that the SNP was associated with head circumference (P = 4.85x10-8), but not with abdominal circumference or humerus/femur lengths. Conditional analysis in an independent sample of mother-offspring pairs replicated the findings and showed that the effect was more likely maternal but not fetal. Trans-ethnic approaches successfully narrowed down the haplotype block that contained the 99% credible set of SNPs associated with head circumference. We further demonstrated that decreased placental expression of ITPR1 was correlated with increased placental epigenetic age acceleration, a risk factor for reduced fetal growth, among male fetuses (r = -0.4, P = 0.01). Finally, genetic risk score composed of known maternal SNPs implicated in birthweight among Europeans was associated with fetal weight from mid-gestation onwards among Whites only. The present study sheds new light on the role of common maternal genetic variants in the inositol receptor signaling pathway on fetal growth from late second trimester to early third trimester. Clinical Trial Registration: ClinicalTrials.gov, NCT00912132. Abnormal fetal growth is a risk factor for infant morbidity and mortality, and adult cardiometabolic diseases. Genetic influences on fetal growth can vary at different gestation times. We performed trans-ethnic genome-wide meta-analyses of 1,849 pregnant women from four race/ethnic groups to identify maternal genetic loci associated with ultrasound-based fetal weight estimates at three gestational periods. We identified and validated a novel genome-wide significant association of rs746039 [G] in the ITPR1 gene with reduced fetal weight at end of second trimester. We further demonstrated that decreased placental expression of ITPR1 was correlated with increased placental epigenetic age acceleration, a risk factor for reduced fetal growth, among male fetuses. We evaluated known birthweight loci and identified gestation time-specific associations of six maternal loci with fetal weight. A maternal genetic risk score of birthweight was associated with fetal weight from mid-gestation onwards among Whites. Our study sheds new light on the genetic regulation of gestation time-specific fetal growth.
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Affiliation(s)
- Fasil Tekola-Ayele
- Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
- * E-mail:
| | - Cuilin Zhang
- Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Jing Wu
- Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Katherine L. Grantz
- Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Mohammad L. Rahman
- Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
- Department of Population Medicine and Harvard Pilgrim Healthcare Institute, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Deepika Shrestha
- Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Marion Ouidir
- Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Tsegaselassie Workalemahu
- Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Michael Y. Tsai
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota, United States of America
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36
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Inositol 1,4,5-Trisphosphate Receptors in Human Disease: A Comprehensive Update. J Clin Med 2020; 9:jcm9041096. [PMID: 32290556 PMCID: PMC7231134 DOI: 10.3390/jcm9041096] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 03/30/2020] [Accepted: 04/10/2020] [Indexed: 12/22/2022] Open
Abstract
Inositol 1,4,5-trisphosphate receptors (ITPRs) are intracellular calcium release channels located on the endoplasmic reticulum of virtually every cell. Herein, we are reporting an updated systematic summary of the current knowledge on the functional role of ITPRs in human disorders. Specifically, we are describing the involvement of its loss-of-function and gain-of-function mutations in the pathogenesis of neurological, immunological, cardiovascular, and neoplastic human disease. Recent results from genome-wide association studies are also discussed.
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37
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Gana S, Valente EM. Movement Disorders in Genetic Pediatric Ataxias. Mov Disord Clin Pract 2020; 7:383-393. [PMID: 32373654 DOI: 10.1002/mdc3.12937] [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: 11/19/2019] [Revised: 02/24/2020] [Accepted: 03/08/2020] [Indexed: 11/06/2022] Open
Abstract
Background Genetic pediatric ataxias are heterogeneous rare disorders, mainly inherited as autosomal-recessive traits. Most forms are progressive and lack effective treatment, with relevant socioeconomical impact. Albeit ataxia represents the main clinical feature, the phenotype can be more complex, with additional neurological and nonneurological signs being described in several forms. Methods and Results In this review, we provide an overview of the occurrence and spectrum of movement disorders in the most relevant forms of childhood-onset genetic ataxias. All types of hypokinetic and hyperkinetic movement disorders of variable severity have been reported. Movement disorders occasionally represent the symptom of onset, predating ataxia even of a few years and therefore challenging an early diagnosis. Their pathogenesis still remains poorly defined, as it is not yet clear whether movement disorders may directly relate to the cerebellar pathology or result from an extracerebellar dysfunction, including the basal ganglia. Conclusion Recognition of the complete movement disorder phenotype in genetic pediatric ataxias has important implications for diagnosis, management, and genetic counseling.
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Affiliation(s)
| | - Enza Maria Valente
- IRCCS Mondino Foundation Pavia Italy.,Department of Molecular Medicine University of Pavia Pavia Italy
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38
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Binda F, Pernaci C, Saxena S. Cerebellar Development and Circuit Maturation: A Common Framework for Spinocerebellar Ataxias. Front Neurosci 2020; 14:293. [PMID: 32300292 PMCID: PMC7145357 DOI: 10.3389/fnins.2020.00293] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Accepted: 03/13/2020] [Indexed: 01/24/2023] Open
Abstract
Spinocerebellar ataxias (SCAs) affect the cerebellum and its afferent and efferent systems that degenerate during disease progression. In the cerebellum, Purkinje cells (PCs) are the most vulnerable and their prominent loss in the late phase of the pathology is the main characteristic of these neurodegenerative diseases. Despite the constant advancement in the discovery of affected molecules and cellular pathways, a comprehensive description of the events leading to the development of motor impairment and degeneration is still lacking. However, in the last years the possible causal role for altered cerebellar development and neuronal circuit wiring in SCAs has been emerging. Not only wiring and synaptic transmission deficits are a common trait of SCAs, but also preventing the expression of the mutant protein during cerebellar development seems to exert a protective role. By discussing this tight relationship between cerebellar development and SCAs, in this review, we aim to highlight the importance of cerebellar circuitry for the investigation of SCAs.
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Affiliation(s)
- Francesca Binda
- Department of Neurology, Center for Experimental Neurology, University Hospital of Bern, Bern, Switzerland.,Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
| | - Carla Pernaci
- Department of Neurology, Center for Experimental Neurology, University Hospital of Bern, Bern, Switzerland.,Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland.,Graduate School for Cellular and Biomedical Sciences, University of Bern, Switzerland
| | - Smita Saxena
- Department of Neurology, Center for Experimental Neurology, University Hospital of Bern, Bern, Switzerland.,Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
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39
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Rosini F, Pretegiani E, Battisti C, Dotti MT, Federico A, Rufa A. Eye movement changes in autosomal dominant spinocerebellar ataxias. Neurol Sci 2020; 41:1719-1734. [PMID: 32130555 DOI: 10.1007/s10072-020-04318-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 02/24/2020] [Indexed: 12/15/2022]
Abstract
Oculomotor abnormalities are common findings in spinocerebellar ataxias (SCAs), a clinically heterogeneous group of neurodegenerative disorders with an autosomal dominant pattern of inheritance. Usually, cerebellar impairment accounts for most of the eye movement changes encountered; as the disease progresses, the involvement of extracerebellar structures typically seen in later stages may modify the oculomotor progression. However, ocular movement changes are rarely specific. In this regard, some important exceptions include the prominent slowing of horizontal eye movements in SCA2 and, to a lesser extent, in SCA3, SCA4, and SCA28, or the executive deficit in SCA2 and SCA17. Here, we report the eye movement abnormalities and neurological pictures of SCAs through a review of the literature. Genetic and neuropathological/neuroimaging aspects are also briefly discussed. Overall, the findings reported indicate that oculomotor analysis could be of help in differential diagnosis among SCAs and contribute to clarify the role of brain structures, particularly the cerebellum, in oculomotor control.
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Affiliation(s)
- Francesca Rosini
- Department of Medicine Surgery and Neuroscience, Eye Tracking& Visual Application Lab EVALAB, Neurology and Neurometabolic Unit, University of Siena, Viale Bracci 2, 53100, Siena, Italy
| | - Elena Pretegiani
- Department of Medicine Surgery and Neuroscience, Eye Tracking& Visual Application Lab EVALAB, Neurology and Neurometabolic Unit, University of Siena, Viale Bracci 2, 53100, Siena, Italy
| | - Carla Battisti
- Department of Medicine, Surgery and Neuroscience, Neurology and Neurometabolic Unit, University of Siena, Siena, Italy
| | - Maria Teresa Dotti
- Department of Medicine, Surgery and Neuroscience, Neurology and Neurometabolic Unit, University of Siena, Siena, Italy
| | - Antonio Federico
- Department of Medicine, Surgery and Neuroscience, Neurology and Neurometabolic Unit, University of Siena, Siena, Italy
| | - Alessandra Rufa
- Department of Medicine Surgery and Neuroscience, Eye Tracking& Visual Application Lab EVALAB, Neurology and Neurometabolic Unit, University of Siena, Viale Bracci 2, 53100, Siena, Italy.
- Department of Medicine, Surgery and Neuroscience, Neurology and Neurometabolic Unit, University of Siena, Siena, Italy.
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40
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Liu Q, Huang S, Yin P, Yang S, Zhang J, Jing L, Cheng S, Tang B, Li XJ, Pan Y, Li S. Cerebellum-enriched protein INPP5A contributes to selective neuropathology in mouse model of spinocerebellar ataxias type 17. Nat Commun 2020; 11:1101. [PMID: 32107387 PMCID: PMC7046734 DOI: 10.1038/s41467-020-14931-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 02/11/2020] [Indexed: 01/01/2023] Open
Abstract
Spinocerebellar ataxias 17 (SCA17) is caused by polyglutamine (polyQ) expansion in the TATA box-binding protein (TBP). The selective neurodegeneration in the cerebellum in SCA17 raises the question of why ubiquitously expressed polyQ proteins can cause neurodegeneration in distinct brain regions in different polyQ diseases. By expressing mutant TBP in different brain regions in adult wild-type mice via stereotaxic injection of adeno-associated virus, we found that adult cerebellar neurons are particularly vulnerable to mutant TBP. In SCA17 knock-in mice, mutant TBP inhibits SP1-mediated gene transcription to down-regulate INPP5A, a protein that is highly abundant in the cerebellum. CRISPR/Cas9-mediated deletion of Inpp5a in the cerebellum of wild-type mice leads to Purkinje cell degeneration, and Inpp5a overexpression decreases inositol 1,4,5-trisphosphate (IP3) levels and ameliorates Purkinje cell degeneration in SCA17 knock-in mice. Our findings demonstrate the important contribution of a tissue-specific protein to the polyQ protein-mediated selective neuropathology.
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Affiliation(s)
- Qiong Liu
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China.,Department of Human Genetics, Emory University School of Medicine, Atlanta, GA, 30322, USA
| | - Shanshan Huang
- Department of Neurology, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China
| | - Peng Yin
- Guangdong-Hongkong-Macau Institute of CNS Regeneration, Ministry of Education CNS Regeneration Collaborative Joint Laboratory, Jinan University, Guangzhou, China
| | - Su Yang
- Guangdong-Hongkong-Macau Institute of CNS Regeneration, Ministry of Education CNS Regeneration Collaborative Joint Laboratory, Jinan University, Guangzhou, China
| | - Jennifer Zhang
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA, 30322, USA
| | - Liang Jing
- Department of Emergency, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China
| | - Siying Cheng
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China.,Department of Human Genetics, Emory University School of Medicine, Atlanta, GA, 30322, USA
| | - Beisha Tang
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China.,Center for Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan, China
| | - Xiao-Jiang Li
- Guangdong-Hongkong-Macau Institute of CNS Regeneration, Ministry of Education CNS Regeneration Collaborative Joint Laboratory, Jinan University, Guangzhou, China
| | - Yongcheng Pan
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China. .,Department of Human Genetics, Emory University School of Medicine, Atlanta, GA, 30322, USA.
| | - Shihua Li
- Guangdong-Hongkong-Macau Institute of CNS Regeneration, Ministry of Education CNS Regeneration Collaborative Joint Laboratory, Jinan University, Guangzhou, China.
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41
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Prestori F, Moccia F, D’Angelo E. Disrupted Calcium Signaling in Animal Models of Human Spinocerebellar Ataxia (SCA). Int J Mol Sci 2019; 21:ijms21010216. [PMID: 31892274 PMCID: PMC6981692 DOI: 10.3390/ijms21010216] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 12/22/2019] [Accepted: 12/24/2019] [Indexed: 12/12/2022] Open
Abstract
Spinocerebellar ataxias (SCAs) constitute a heterogeneous group of more than 40 autosomal-dominant genetic and neurodegenerative diseases characterized by loss of balance and motor coordination due to dysfunction of the cerebellum and its efferent connections. Despite a well-described clinical and pathological phenotype, the molecular and cellular events that underlie neurodegeneration are still poorly undaerstood. Emerging research suggests that mutations in SCA genes cause disruptions in multiple cellular pathways but the characteristic SCA pathogenesis does not begin until calcium signaling pathways are disrupted in cerebellar Purkinje cells. Ca2+ signaling in Purkinje cells is important for normal cellular function as these neurons express a variety of Ca2+ channels, Ca2+-dependent kinases and phosphatases, and Ca2+-binding proteins to tightly maintain Ca2+ homeostasis and regulate physiological Ca2+-dependent processes. Abnormal Ca2+ levels can activate toxic cascades leading to characteristic death of Purkinje cells, cerebellar atrophy, and ataxia that occur in many SCAs. The output of the cerebellar cortex is conveyed to the deep cerebellar nuclei (DCN) by Purkinje cells via inhibitory signals; thus, Purkinje cell dysfunction or degeneration would partially or completely impair the cerebellar output in SCAs. In the absence of the inhibitory signal emanating from Purkinje cells, DCN will become more excitable, thereby affecting the motor areas receiving DCN input and resulting in uncoordinated movements. An outstanding advantage in studying the pathogenesis of SCAs is represented by the availability of a large number of animal models which mimic the phenotype observed in humans. By mainly focusing on mouse models displaying mutations or deletions in genes which encode for Ca2+ signaling-related proteins, in this review we will discuss the several pathogenic mechanisms related to deranged Ca2+ homeostasis that leads to significant Purkinje cell degeneration and dysfunction.
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Affiliation(s)
- Francesca Prestori
- Department of Brain and Behavioral Sciences, University of Pavia, 27100 Pavia, Italy;
- Correspondence:
| | - Francesco Moccia
- Department of Biology and Biotechnology “Lazzaro Spallanzani”, University of Pavia, 27100 Pavia, Italy;
| | - Egidio D’Angelo
- Department of Brain and Behavioral Sciences, University of Pavia, 27100 Pavia, Italy;
- IRCCS Mondino Foundation, 27100 Pavia, Italy
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42
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Abstract
In the body, extracellular stimuli produce inositol 1,4,5-trisphosphate (IP3), an intracellular chemical signal that binds to the IP3 receptor (IP3R) to release calcium ions (Ca2+) from the endoplasmic reticulum. In the past 40 years, the wide-ranging functions mediated by IP3R and its genetic defects causing a variety of disorders have been unveiled. Recent cryo-electron microscopy and X-ray crystallography have resolved IP3R structures and begun to integrate with concurrent functional studies, which can explicate IP3-dependent opening of Ca2+-conducting gates placed ∼90 Å away from IP3-binding sites and its regulation by Ca2+. This review highlights recent research progress on the IP3R structure and function. We also propose how protein plasticity within IP3R, which involves allosteric gating and assembly transformations accompanied by rapid and chronic structural changes, would enable it to regulate diverse functions at cellular microdomains in pathophysiological states.
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Affiliation(s)
- Kozo Hamada
- Laboratory of Cell Calcium Signaling, Shanghai Institute for Advanced Immunochemical Studies (SIAIS), ShanghaiTech University, Shanghai, 201210, China; ,
| | - Katsuhiko Mikoshiba
- Laboratory of Cell Calcium Signaling, Shanghai Institute for Advanced Immunochemical Studies (SIAIS), ShanghaiTech University, Shanghai, 201210, China; ,
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43
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Wang L, Hao Y, Yu P, Cao Z, Zhang J, Zhang X, Chen Y, Zhang H, Gu W. Identification of a Splicing Mutation in ITPR1 via WES in a Chinese Early-Onset Spinocerebellar Ataxia Family. THE CEREBELLUM 2019; 17:294-299. [PMID: 29196976 PMCID: PMC5966481 DOI: 10.1007/s12311-017-0896-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Mutations in the inositol 1,4,5-triphosphate receptor type 1 gene (ITPR1) lead to SCA15, SCA16, and SCA29. To date, only a few families with SCA29 have been reported. A three-generation Chinese family including four affected persons and two unaffected persons were enrolled in this study. We conducted whole-exome sequencing (WES) of the proband DNA initially to find the causal gene. We ascertained the family with autosomal dominant type of congenital nonprogressive cerebellar ataxia (CNPCA) associated with delayed motor and cognitive impairment. WES study was performed with two patients and identified c.1207-2A–T transition, in exon 14 of ITPR1, which was a splicing mutation. Sanger sequencing showed that four patients within this family carried the mutation and two unaffected members did not carry it. The results showed that the novel splicing mutation of ITPR1 was the causative gene for SCA29. In conclusion, we identified a novel SCA29 causative splicing mutation of ITPR1 in a Chinese family. We suggest ITPR1 gene analysis shall be a priority for diagnosis of patients with early-onset CNPCA. Our study demonstrated that whole-exome sequencing might rapidly improve the diagnosis of genetic ataxias.
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Affiliation(s)
- Li Wang
- Movement Disorder and Neurogenetics Research Center, Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Ying Hao
- Movement Disorder and Neurogenetics Research Center, Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Peng Yu
- Precisionmdx Inc., 6th Floor, 35 Huayuanbeilu, Beijing, 100083, People's Republic of China
| | - Zhenhua Cao
- Precisionmdx Inc., 6th Floor, 35 Huayuanbeilu, Beijing, 100083, People's Republic of China
| | - Jin Zhang
- Movement Disorder and Neurogenetics Research Center, Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Xin Zhang
- Movement Disorder and Neurogenetics Research Center, Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Yuanyuan Chen
- Movement Disorder and Neurogenetics Research Center, Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Hao Zhang
- Precisionmdx Inc., 6th Floor, 35 Huayuanbeilu, Beijing, 100083, People's Republic of China
| | - Weihong Gu
- Movement Disorder and Neurogenetics Research Center, Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China.
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Springer A, Dyck Holzinger S, Andersen J, Buckley D, Fehlings D, Kirton A, Koclas L, Pigeon N, Van Rensburg E, Wood E, Oskoui M, Shevell M. Profile of children with cerebral palsy spectrum disorder and a normal MRI study. Neurology 2019; 93:e88-e96. [PMID: 31127072 DOI: 10.1212/wnl.0000000000007726] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 02/14/2019] [Indexed: 01/01/2023] Open
Abstract
OBJECTIVE This study looks at what profile can be expected in children with cerebral palsy spectrum disorder (CP) and a normal MRI. METHODS The data were excerpted from the Canadian Cerebral Palsy Registry database. Only patients who had undergone MRI were included in the analysis. Neuroimaging classification was ascertained by university-based pediatric neuroradiologists and split into 2 categories: normal and abnormal MRIs. Six factors were then compared between those 2 groups: prematurity, perinatal adversity, presence of more than 1 comorbidity, CP subtype, bimanual dexterity (Manual Ability Classification System [MACS]), and gross motor function (Gross Motor Function Classification System [GMFCS]). RESULTS Participants with no perinatal adversity were 5.518 times more likely to have a normal MRI (p < 0.0001, 95% confidence interval [CI] 4.153-7.330). Furthermore, participants with dyskinetic, ataxic/hypotonic, and spastic diplegic forms of CP were 2.045 times more likely to have a normal MRI than those with hemiplegia, triplegia, and quadriplegia (p < 0.0001, 95% CI 1.506-2.778). No significant difference was found in prematurity, GMFCS levels, MACS levels, and the number of comorbidities. CONCLUSIONS Normal MRIs were associated with lack of perinatal adversity as well as with the dyskinetic, ataxic/hypotonic, and spastic diplegic CP subtypes. As MRI normality is not strongly associated with the severity of CP, continuous follow-up in children with normal imaging appears warranted. Further advanced imaging modalities, as well as strong consideration for metabolic and genetic testing, may provide additional insights into causal pathways in this population.
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Affiliation(s)
- Arielle Springer
- From the Faculty of Medicine (A.S.) and Departments of Pediatrics (M.O., M.S.) and Neurology & Neurosurgery (M.O., M.S.), McGill University; Canadian Cerebral Palsy Registry (S.D.H.), Research Institute of the McGill University Health Centre, Montreal; Department of Pediatrics (J.A.), University of Alberta, Edmonton; Janeway Children's Hospital (D.B.), St. John's; Department of Paediatrics (D.F.), Bloorview Research Institute, University of Toronto; Departments of Pediatrics and Clinical Neurosciences (A.K.), Cumming School of Medicine, University of Calgary; Centre de Réadaptation Marie Enfant du CHU Sainte-Justine (L.K.), Montreal; Centre Hospitalier Universitaire de Sherbrooke (N.P.); BC Children's Hospital (E.V.R.), Vancouver; and IWK Health Centre (E.W.), Halifax, Canada
| | - Sasha Dyck Holzinger
- From the Faculty of Medicine (A.S.) and Departments of Pediatrics (M.O., M.S.) and Neurology & Neurosurgery (M.O., M.S.), McGill University; Canadian Cerebral Palsy Registry (S.D.H.), Research Institute of the McGill University Health Centre, Montreal; Department of Pediatrics (J.A.), University of Alberta, Edmonton; Janeway Children's Hospital (D.B.), St. John's; Department of Paediatrics (D.F.), Bloorview Research Institute, University of Toronto; Departments of Pediatrics and Clinical Neurosciences (A.K.), Cumming School of Medicine, University of Calgary; Centre de Réadaptation Marie Enfant du CHU Sainte-Justine (L.K.), Montreal; Centre Hospitalier Universitaire de Sherbrooke (N.P.); BC Children's Hospital (E.V.R.), Vancouver; and IWK Health Centre (E.W.), Halifax, Canada
| | - John Andersen
- From the Faculty of Medicine (A.S.) and Departments of Pediatrics (M.O., M.S.) and Neurology & Neurosurgery (M.O., M.S.), McGill University; Canadian Cerebral Palsy Registry (S.D.H.), Research Institute of the McGill University Health Centre, Montreal; Department of Pediatrics (J.A.), University of Alberta, Edmonton; Janeway Children's Hospital (D.B.), St. John's; Department of Paediatrics (D.F.), Bloorview Research Institute, University of Toronto; Departments of Pediatrics and Clinical Neurosciences (A.K.), Cumming School of Medicine, University of Calgary; Centre de Réadaptation Marie Enfant du CHU Sainte-Justine (L.K.), Montreal; Centre Hospitalier Universitaire de Sherbrooke (N.P.); BC Children's Hospital (E.V.R.), Vancouver; and IWK Health Centre (E.W.), Halifax, Canada
| | - David Buckley
- From the Faculty of Medicine (A.S.) and Departments of Pediatrics (M.O., M.S.) and Neurology & Neurosurgery (M.O., M.S.), McGill University; Canadian Cerebral Palsy Registry (S.D.H.), Research Institute of the McGill University Health Centre, Montreal; Department of Pediatrics (J.A.), University of Alberta, Edmonton; Janeway Children's Hospital (D.B.), St. John's; Department of Paediatrics (D.F.), Bloorview Research Institute, University of Toronto; Departments of Pediatrics and Clinical Neurosciences (A.K.), Cumming School of Medicine, University of Calgary; Centre de Réadaptation Marie Enfant du CHU Sainte-Justine (L.K.), Montreal; Centre Hospitalier Universitaire de Sherbrooke (N.P.); BC Children's Hospital (E.V.R.), Vancouver; and IWK Health Centre (E.W.), Halifax, Canada
| | - Darcy Fehlings
- From the Faculty of Medicine (A.S.) and Departments of Pediatrics (M.O., M.S.) and Neurology & Neurosurgery (M.O., M.S.), McGill University; Canadian Cerebral Palsy Registry (S.D.H.), Research Institute of the McGill University Health Centre, Montreal; Department of Pediatrics (J.A.), University of Alberta, Edmonton; Janeway Children's Hospital (D.B.), St. John's; Department of Paediatrics (D.F.), Bloorview Research Institute, University of Toronto; Departments of Pediatrics and Clinical Neurosciences (A.K.), Cumming School of Medicine, University of Calgary; Centre de Réadaptation Marie Enfant du CHU Sainte-Justine (L.K.), Montreal; Centre Hospitalier Universitaire de Sherbrooke (N.P.); BC Children's Hospital (E.V.R.), Vancouver; and IWK Health Centre (E.W.), Halifax, Canada
| | - Adam Kirton
- From the Faculty of Medicine (A.S.) and Departments of Pediatrics (M.O., M.S.) and Neurology & Neurosurgery (M.O., M.S.), McGill University; Canadian Cerebral Palsy Registry (S.D.H.), Research Institute of the McGill University Health Centre, Montreal; Department of Pediatrics (J.A.), University of Alberta, Edmonton; Janeway Children's Hospital (D.B.), St. John's; Department of Paediatrics (D.F.), Bloorview Research Institute, University of Toronto; Departments of Pediatrics and Clinical Neurosciences (A.K.), Cumming School of Medicine, University of Calgary; Centre de Réadaptation Marie Enfant du CHU Sainte-Justine (L.K.), Montreal; Centre Hospitalier Universitaire de Sherbrooke (N.P.); BC Children's Hospital (E.V.R.), Vancouver; and IWK Health Centre (E.W.), Halifax, Canada
| | - Louise Koclas
- From the Faculty of Medicine (A.S.) and Departments of Pediatrics (M.O., M.S.) and Neurology & Neurosurgery (M.O., M.S.), McGill University; Canadian Cerebral Palsy Registry (S.D.H.), Research Institute of the McGill University Health Centre, Montreal; Department of Pediatrics (J.A.), University of Alberta, Edmonton; Janeway Children's Hospital (D.B.), St. John's; Department of Paediatrics (D.F.), Bloorview Research Institute, University of Toronto; Departments of Pediatrics and Clinical Neurosciences (A.K.), Cumming School of Medicine, University of Calgary; Centre de Réadaptation Marie Enfant du CHU Sainte-Justine (L.K.), Montreal; Centre Hospitalier Universitaire de Sherbrooke (N.P.); BC Children's Hospital (E.V.R.), Vancouver; and IWK Health Centre (E.W.), Halifax, Canada
| | - Nicole Pigeon
- From the Faculty of Medicine (A.S.) and Departments of Pediatrics (M.O., M.S.) and Neurology & Neurosurgery (M.O., M.S.), McGill University; Canadian Cerebral Palsy Registry (S.D.H.), Research Institute of the McGill University Health Centre, Montreal; Department of Pediatrics (J.A.), University of Alberta, Edmonton; Janeway Children's Hospital (D.B.), St. John's; Department of Paediatrics (D.F.), Bloorview Research Institute, University of Toronto; Departments of Pediatrics and Clinical Neurosciences (A.K.), Cumming School of Medicine, University of Calgary; Centre de Réadaptation Marie Enfant du CHU Sainte-Justine (L.K.), Montreal; Centre Hospitalier Universitaire de Sherbrooke (N.P.); BC Children's Hospital (E.V.R.), Vancouver; and IWK Health Centre (E.W.), Halifax, Canada
| | - Esias Van Rensburg
- From the Faculty of Medicine (A.S.) and Departments of Pediatrics (M.O., M.S.) and Neurology & Neurosurgery (M.O., M.S.), McGill University; Canadian Cerebral Palsy Registry (S.D.H.), Research Institute of the McGill University Health Centre, Montreal; Department of Pediatrics (J.A.), University of Alberta, Edmonton; Janeway Children's Hospital (D.B.), St. John's; Department of Paediatrics (D.F.), Bloorview Research Institute, University of Toronto; Departments of Pediatrics and Clinical Neurosciences (A.K.), Cumming School of Medicine, University of Calgary; Centre de Réadaptation Marie Enfant du CHU Sainte-Justine (L.K.), Montreal; Centre Hospitalier Universitaire de Sherbrooke (N.P.); BC Children's Hospital (E.V.R.), Vancouver; and IWK Health Centre (E.W.), Halifax, Canada
| | - Ellen Wood
- From the Faculty of Medicine (A.S.) and Departments of Pediatrics (M.O., M.S.) and Neurology & Neurosurgery (M.O., M.S.), McGill University; Canadian Cerebral Palsy Registry (S.D.H.), Research Institute of the McGill University Health Centre, Montreal; Department of Pediatrics (J.A.), University of Alberta, Edmonton; Janeway Children's Hospital (D.B.), St. John's; Department of Paediatrics (D.F.), Bloorview Research Institute, University of Toronto; Departments of Pediatrics and Clinical Neurosciences (A.K.), Cumming School of Medicine, University of Calgary; Centre de Réadaptation Marie Enfant du CHU Sainte-Justine (L.K.), Montreal; Centre Hospitalier Universitaire de Sherbrooke (N.P.); BC Children's Hospital (E.V.R.), Vancouver; and IWK Health Centre (E.W.), Halifax, Canada
| | - Maryam Oskoui
- From the Faculty of Medicine (A.S.) and Departments of Pediatrics (M.O., M.S.) and Neurology & Neurosurgery (M.O., M.S.), McGill University; Canadian Cerebral Palsy Registry (S.D.H.), Research Institute of the McGill University Health Centre, Montreal; Department of Pediatrics (J.A.), University of Alberta, Edmonton; Janeway Children's Hospital (D.B.), St. John's; Department of Paediatrics (D.F.), Bloorview Research Institute, University of Toronto; Departments of Pediatrics and Clinical Neurosciences (A.K.), Cumming School of Medicine, University of Calgary; Centre de Réadaptation Marie Enfant du CHU Sainte-Justine (L.K.), Montreal; Centre Hospitalier Universitaire de Sherbrooke (N.P.); BC Children's Hospital (E.V.R.), Vancouver; and IWK Health Centre (E.W.), Halifax, Canada
| | - Michael Shevell
- From the Faculty of Medicine (A.S.) and Departments of Pediatrics (M.O., M.S.) and Neurology & Neurosurgery (M.O., M.S.), McGill University; Canadian Cerebral Palsy Registry (S.D.H.), Research Institute of the McGill University Health Centre, Montreal; Department of Pediatrics (J.A.), University of Alberta, Edmonton; Janeway Children's Hospital (D.B.), St. John's; Department of Paediatrics (D.F.), Bloorview Research Institute, University of Toronto; Departments of Pediatrics and Clinical Neurosciences (A.K.), Cumming School of Medicine, University of Calgary; Centre de Réadaptation Marie Enfant du CHU Sainte-Justine (L.K.), Montreal; Centre Hospitalier Universitaire de Sherbrooke (N.P.); BC Children's Hospital (E.V.R.), Vancouver; and IWK Health Centre (E.W.), Halifax, Canada.
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Elert-Dobkowska E, Stepniak I, Krysa W, Ziora-Jakutowicz K, Rakowicz M, Sobanska A, Pilch J, Antczak-Marach D, Zaremba J, Sulek A. Next-generation sequencing study reveals the broader variant spectrum of hereditary spastic paraplegia and related phenotypes. Neurogenetics 2019; 20:27-38. [PMID: 30778698 PMCID: PMC6411833 DOI: 10.1007/s10048-019-00565-6] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Accepted: 01/11/2019] [Indexed: 12/18/2022]
Abstract
Hereditary spastic paraplegias (HSPs) are clinically and genetically heterogeneous neurodegenerative disorders. Numerous genes linked to HSPs, overlapping phenotypes between HSP subtypes and other neurodegenerative disorders and the HSPs’ dual mode of inheritance (both dominant and recessive) make the genetic diagnosis of HSPs complex and difficult. Out of the original HSP cohort comprising 306 index cases (familial and isolated) who had been tested according to “traditional workflow/guidelines” by Multiplex Ligation-dependent Probe Amplification (MLPA) and Sanger sequencing, 30 unrelated patients (all familial cases) with unsolved genetic diagnoses were tested using next-generation sequencing (NGS). One hundred thirty-two genes associated with spastic paraplegias, hereditary ataxias and related movement disorders were analysed using the Illumina TruSight™ One Sequencing Panel. The targeted NGS data showed pathogenic variants, likely pathogenic variants and those of uncertain significance (VUS) in the following genes: SPAST (spastin, SPG4), ATL1 (atlastin 1, SPG3), WASHC5 (SPG8), KIF5A (SPG10), KIF1A (SPG30), SPG11 (spatacsin), CYP27A1, SETX and ITPR1. Out of the nine genes mentioned above, three have not been directly associated with the HSP phenotype to date. Considering the phenotypic overlap and joint cellular pathways of the HSP, spinocerebellar ataxia (SCA) and amyotrophic lateral sclerosis (ALS) genes, our findings provide further evidence that common genetic testing may improve the diagnostics of movement disorders with a spectrum of ataxia-spasticity signs.
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Affiliation(s)
- Ewelina Elert-Dobkowska
- Department of Genetics, Institute of Psychiatry and Neurology, Sobieskiego 9 Street, 02-957, Warsaw, Poland
| | - Iwona Stepniak
- Department of Genetics, Institute of Psychiatry and Neurology, Sobieskiego 9 Street, 02-957, Warsaw, Poland
| | - Wioletta Krysa
- Department of Genetics, Institute of Psychiatry and Neurology, Sobieskiego 9 Street, 02-957, Warsaw, Poland
| | - Karolina Ziora-Jakutowicz
- Department of Genetics, Institute of Psychiatry and Neurology, Sobieskiego 9 Street, 02-957, Warsaw, Poland
| | - Maria Rakowicz
- Department of Clinical Neurophysiology, Institute of Psychiatry and Neurology, Warsaw, Poland
| | - Anna Sobanska
- Department of Clinical Neurophysiology, Institute of Psychiatry and Neurology, Warsaw, Poland
| | - Jacek Pilch
- Department of Paediatric Neurology, Medical University of Silesia, Katowice, Poland
| | - Dorota Antczak-Marach
- Clinic of Neurology of Children and Adolescents, Institute of Mother and Child, Warsaw, Poland
| | - Jacek Zaremba
- Department of Genetics, Institute of Psychiatry and Neurology, Sobieskiego 9 Street, 02-957, Warsaw, Poland.,Division Five of Medical Sciences, Polish Academy of Science, Warsaw, Poland
| | - Anna Sulek
- Department of Genetics, Institute of Psychiatry and Neurology, Sobieskiego 9 Street, 02-957, Warsaw, Poland.
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Silva RP, Berton MP, Grigoletto L, Carvalho FE, Silva RMO, Peripolli E, Castro LM, Ferraz JBS, Eler JP, Lôbo RB, Baldi F. Genomic regions and enrichment analyses associated with carcass composition indicator traits in Nellore cattle. J Anim Breed Genet 2018; 136:118-133. [PMID: 30592105 DOI: 10.1111/jbg.12373] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 10/29/2018] [Accepted: 11/17/2018] [Indexed: 12/30/2022]
Abstract
The aim of this study was to estimate genetic parameters and identify genomic regions associated with carcass traits obtained by ultrasound and visual scores in Nellore cattle. Data from ~66,000 animals from the National Association of Breeders and Researchers (ANCP) were used. The variance components for backfat thickness, rump fat thickness and Longissimus muscle area (LMA) were estimated considering a linear model whereas a threshold model for body structure (BS), finishing precocity (FP) and musculature (MS) traits. The SNP solutions were estimated using the ssGBLUP approach by considering windows of 10 consecutive SNPs. Regions that accounted for more than 1.0% of the additive genetic variance were used. Genes identified within the significant windows, such as FOXA3, AP2S1, FKRP, NPASI and ATP6V1G1, were found to be related with MS, while OMA1 and FFGY with BS and FP traits. The PLTP, TNNC2 and GPAT2 genes were found in the regions associated with LMA, as well as TKT, FNDC5 and CHRND can strongly be related with fat deposition. Gene enrichment analysis revealed processes that might be directly influenced the organism growth and development. These results should help to better understand the genetic and physiological mechanisms regulating growth and body composition, muscle tissue development and subcutaneous fat expression, and this information might be useful for future genomic studies in Nellore cattle.
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Affiliation(s)
- Rosiane P Silva
- Departament of Veterinary Medicine, College of Animal Science and Food Engineer, University of São Paulo (USP), Pirassununga, SP, Brazil
| | - Mariana P Berton
- Departament of Animal Science, College of Agricultural and Veterinarian Sciences, São Paulo State University (UNESP), Jaboticabal, SP, Brazil
| | - Laís Grigoletto
- Departament of Veterinary Medicine, College of Animal Science and Food Engineer, University of São Paulo (USP), Pirassununga, SP, Brazil
| | - Felipe E Carvalho
- Departament of Veterinary Medicine, College of Animal Science and Food Engineer, University of São Paulo (USP), Pirassununga, SP, Brazil
| | - Rafael M O Silva
- Zoetis, Edifício Morumbi Corporate, Diamond Tower, São Paulo, SP, Brazil
| | - Elisa Peripolli
- Departament of Animal Science, College of Agricultural and Veterinarian Sciences, São Paulo State University (UNESP), Jaboticabal, SP, Brazil
| | - Letícia M Castro
- Nacional Association of Breeders and Researchers (ANCP), Ribeirão Preto, SP, Brazil
| | - José Bento S Ferraz
- Departament of Veterinary Medicine, College of Animal Science and Food Engineer, University of São Paulo (USP), Pirassununga, SP, Brazil
| | - Joanir P Eler
- Departament of Veterinary Medicine, College of Animal Science and Food Engineer, University of São Paulo (USP), Pirassununga, SP, Brazil
| | - Raysildo B Lôbo
- Nacional Association of Breeders and Researchers (ANCP), Ribeirão Preto, SP, Brazil
| | - Fernando Baldi
- Departament of Veterinary Medicine, College of Animal Science and Food Engineer, University of São Paulo (USP), Pirassununga, SP, Brazil
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Aberrant IP 3 receptor activities revealed by comprehensive analysis of pathological mutations causing spinocerebellar ataxia 29. Proc Natl Acad Sci U S A 2018; 115:12259-12264. [PMID: 30429331 DOI: 10.1073/pnas.1811129115] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Spinocerebellar ataxia type 29 (SCA29) is autosomal dominant congenital ataxia characterized by early-onset motor delay, hypotonia, and gait ataxia. Recently, heterozygous missense mutations in an intracellular Ca2+ channel, inositol 1,4,5-trisphosphate (IP3) receptor type 1 (IP3R1), were identified as a cause of SCA29. However, the functional impacts of these mutations remain largely unknown. Here, we determined the molecular mechanisms by which pathological mutations affect IP3R1 activity and Ca2+ dynamics. Ca2+ imaging using IP3R-null HeLa cells generated by genome editing revealed that all SCA29 mutations identified within or near the IP3-binding domain of IP3R1 completely abolished channel activity. Among these mutations, R241K, T267M, T267R, R269G, R269W, S277I, K279E, A280D, and E497K impaired IP3 binding to IP3R1, whereas the T579I and N587D mutations disrupted channel activity without affecting IP3 binding, suggesting that T579I and N587D compromise channel gating mechanisms. Carbonic anhydrase-related protein VIII (CA8) is an IP3R1-regulating protein abundantly expressed in cerebellar Purkinje cells and is a causative gene of congenital ataxia. The SCA29 mutation V1538M within the CA8-binding site of IP3R1 completely eliminated its interaction with CA8 and CA8-mediated IP3R1 inhibition. Furthermore, pathological mutations in CA8 decreased CA8-mediated suppression of IP3R1 by reducing protein stability and the interaction with IP3R1. These results demonstrated the mechanisms by which pathological mutations cause IP3R1 dysfunction, i.e., the disruption of IP3 binding, IP3-mediated gating, and regulation via the IP3R-modulatory protein. The resulting aberrant Ca2+ homeostasis may contribute to the pathogenesis of cerebellar ataxia.
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Shimobayashi E, Kapfhammer JP. Calcium Signaling, PKC Gamma, IP3R1 and CAR8 Link Spinocerebellar Ataxias and Purkinje Cell Dendritic Development. Curr Neuropharmacol 2018; 16:151-159. [PMID: 28554312 PMCID: PMC5883377 DOI: 10.2174/1570159x15666170529104000] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 05/16/2017] [Accepted: 05/25/2017] [Indexed: 01/05/2023] Open
Abstract
Background Spinocerebellar ataxias (SCAs) are a group of cerebellar diseases characterized by progressive ataxia and cerebellar atrophy. Several forms of SCAs are caused by missense mutations or deletions in genes related to calcium signaling in Purkinje cells. Among them, spinocerebellar ataxia type 14 (SCA14) is caused by missense mutations in PRKCG gene which encodes protein kinase C gamma (PKCγ). It is remarkable that in several cases in which SCA is caused by point mutations in an individual gene, the affected genes are involved in the PKCγ signaling pathway and calcium signaling which is not only crucial for proper Purkinje cell function but is also involved in the control of Purkinje cell dendritic development. In this review, we will focus on the PKCγ signaling related genes and calcium signaling related genes then discuss their role for both Purkinje cell dendritic development and cerebellar ataxia. Methods Research related to SCAs and Purkinje cell dendritic development is reviewed. Results PKCγ dysregulation causes abnormal Purkinje cell dendritic development and SCA14. Carbonic anhydrase related protein 8 (Car8) encoding CAR8 and Itpr1 encoding IP3R1were identified as upregulated genes in one of SCA14 mouse model. IP3R1, CAR8 and PKCγ proteins are strongly and specifically expressed in Purkinje cells. The common function among them is that they are involved in the regulation of calcium homeostasis in Purkinje cells and their dysfunction causes ataxia in mouse and human. Furthermore, disruption of intracellular calcium homeostasis caused by mutations in some calcium channels in Purkinje cells links to abnormal Purkinje cell dendritic development and the pathogenesis of several SCAs. Conclusion Once PKCγ signaling related genes and calcium signaling related genes are disturbed, the normal dendritic development of Purkinje cells is impaired as well as the integration of signals from other neurons, resulting in abnormal development, cerebellar dysfunction and eventually Purkinje cell loss.
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Affiliation(s)
- Etsuko Shimobayashi
- Anatomical Institute, Department of Biomedicine Basel, University of Basel, Pestalozzistrasse 20, CH-4056 Basel, Switzerland
| | - Josef P Kapfhammer
- Anatomical Institute, Department of Biomedicine Basel, University of Basel, Pestalozzistrasse 20, CH-4056 Basel, Switzerland
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Exome sequencing in congenital ataxia identifies two new candidate genes and highlights a pathophysiological link between some congenital ataxias and early infantile epileptic encephalopathies. Genet Med 2018; 21:553-563. [DOI: 10.1038/s41436-018-0089-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2018] [Accepted: 06/04/2018] [Indexed: 12/16/2022] Open
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50
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Kumari R, Kumar D, Brahmachari SK, Srivastava AK, Faruq M, Mukerji M. Paradigm for disease deconvolution in rare neurodegenerative disorders in Indian population: insights from studies in cerebellar ataxias. J Genet 2018; 97:589-609. [PMID: 30027898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Cerebellar ataxias are a group of rare progressive neurodegenerative disorders with an average prevalence ranges from 4.8 to 13.8 in 100,000 individuals. The inherited disorders affect multiple members of the families, or a community that is endogamous or consanguineous. Presence of more than 3000 mutations in different genes with overlapping clinical symptoms, genetic anticipation and pleiotropy, as well as incomplete penetrance and variable expressivity due to modifiers pose challenges in genotype-phenotype correlation. Development of a diagnostic algorithm could reduce the time as well as cost in clinicogenetic diagnostics and also help in reducing the economic and social burden of the disease. In a unique research collaboration spanning over 20 years, we have been able to develop a paradigm for studying cerebellar ataxias in the Indian population which would also be relevant in other rare diseases. This has involved clinical and genetic analysis of thousands of families from diverse Indian populations. The extensive resource on ataxia has led to the development of a clinicogenetic algorithm for cost-effective screening of ataxia and a unique ataxia clinic in the tertiary referral centre in All India Institute of Medical Sciences. Utilizing a population polymorphism scanning approach, we have been able to dissect the mechanisms of repeat instability and expansion in many ataxias, and also identify founders, and trace the mutational histories in the Indian population. This provides information for genetic testing of at-risk as well as protected individuals and populations. To dissect uncharacterized cases which comprises more than 50% of the cases, we have explored the potential of next-generation sequencing technologies coupled with the extensive resource of baseline data generated in-house and other public domains. We have also developed a repository of patient-derived peripheral blood mononuclear cells, lymphoblastoid cell lines and neuronal lineages (derived from iPSCs) for ascribing functionality to novel genes/mutations. Through integrating these technologies, novel genes have been identified that has broadened the diagnostic panel, increased the diagnostic yield to over 75%, helped in ascribing pathogenicity to novel mutations and enabled understanding of disease mechanisms. It has also provided a platform for testing novel molecules for amelioration of pathophysiological phenotypes. This review through a perspective on CAs suggests a generic paradigm fromdiagnostics to therapeutic interventions for rare disorders in the context of heterogeneous Indian populations.
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Affiliation(s)
- Renu Kumari
- CSIR Institute of Genomics and Integrative Biology (CSIR-IGIB), Mathura Road, New Delhi 110 025, India. E-mail:
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