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Dong YN, Ngaba LV, An J, Adeshina MW, Warren N, Wong J, Lynch DR. A peptide derived from TID1S rescues frataxin deficiency and mitochondrial defects in FRDA cellular models. Front Pharmacol 2024; 15:1352311. [PMID: 38495102 PMCID: PMC10940384 DOI: 10.3389/fphar.2024.1352311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 02/02/2024] [Indexed: 03/19/2024] Open
Abstract
Friedreich's ataxia (FRDA), the most common recessive inherited ataxia, results from homozygous guanine-adenine-adenine (GAA) repeat expansions in intron 1 of the FXN gene, which leads to the deficiency of frataxin, a mitochondrial protein essential for iron-sulphur cluster synthesis. The study of frataxin protein regulation might yield new approaches for FRDA treatment. Here, we report tumorous imaginal disc 1 (TID1), a mitochondrial J-protein cochaperone, as a binding partner of frataxin that negatively controls frataxin protein levels. TID1 interacts with frataxin both in vivo in mouse cortex and in vitro in cortical neurons. Acute and subacute depletion of frataxin using RNA interference markedly increases TID1 protein levels in multiple cell types. In addition, TID1 overexpression significantly increases frataxin precursor but decreases intermediate and mature frataxin levels in HEK293 cells. In primary cultured human skin fibroblasts, overexpression of TID1S results in decreased levels of mature frataxin and increased fragmentation of mitochondria. This effect is mediated by the last 6 amino acids of TID1S as a peptide made from this sequence rescues frataxin deficiency and mitochondrial defects in FRDA patient-derived cells. Our findings show that TID1 negatively modulates frataxin levels, and thereby suggests a novel therapeutic target for treating FRDA.
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Affiliation(s)
- Yi Na Dong
- Department of Pediatrics and Neurology, The Children’s Hospital of Philadelphia, Philadelphia, PA, United States
- Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Lucie Vanessa Ngaba
- Department of Pediatrics and Neurology, The Children’s Hospital of Philadelphia, Philadelphia, PA, United States
| | - Jacob An
- Department of Pediatrics and Neurology, The Children’s Hospital of Philadelphia, Philadelphia, PA, United States
| | - Miniat W. Adeshina
- Department of Pediatrics and Neurology, The Children’s Hospital of Philadelphia, Philadelphia, PA, United States
| | - Nathan Warren
- Department of Pediatrics and Neurology, The Children’s Hospital of Philadelphia, Philadelphia, PA, United States
| | - Johnathan Wong
- Department of Pediatrics and Neurology, The Children’s Hospital of Philadelphia, Philadelphia, PA, United States
| | - David R. Lynch
- Department of Pediatrics and Neurology, The Children’s Hospital of Philadelphia, Philadelphia, PA, United States
- Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States
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Ricci FS, Stanga S, Mezzanotte M, Marinaccio C, D'Alessandro R, Somà A, Sottemano S, Conio A, Morana G, Spada M, Boido M, Mongini TE. Biochemical characterization on muscle tissue of a novel biallelic ACO2 mutation in an infant with progressive encephalopathy. JIMD Rep 2024; 65:3-9. [PMID: 38186851 PMCID: PMC10764196 DOI: 10.1002/jmd2.12400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 10/06/2023] [Accepted: 10/10/2023] [Indexed: 01/09/2024] Open
Abstract
The ACO2 gene encodes the mitochondrial protein aconitate hydratase, which is responsible for catalyzing the interconversion of citrate into isocitrate in the tricarboxylic acid (TCA) cycle. Mitochondrial aconitase is expressed ubiquitously, and deficiencies in TCA-cycle enzymes have been reported to cause various neurodegenerative diseases due to disruption of cellular energy metabolism and development of oxidative stress. We investigated a severe early infantile-onset neurometabolic syndrome due to a homozygous novel variant in exon 13 of the ACO2 gene. The in vitro pathogenicity of this variant of unknown significance was demonstrated by the loss of both protein expression and its enzymatic activity on muscle tissue sample taken from the patient. The patient presented with progressive encephalopathy soon after birth, characterized by hypotonia, progressive severe muscle atrophy, and respiratory failure. Serial brain magnetic resonance imaging showed progressive abnormalities compatible with a metabolic disorder, possibly mitochondrial. Muscle biopsy disclosed moderate myopathic alterations and features consistent with a mitochondriopathy albeit nonspecific. The course was characterized by progressive worsening of the clinical and neurological picture, and the patient died at 5 months of age. This study provides the first report on the validation in muscle from human subjects regarding in vitro analysis for mitochondrial aconitase activity. To our knowledge, no prior reports have demonstrated a correlation of phenotypic and diagnostic characteristics with in vitro muscle enzymatic activity of mitochondrial aconitase in humans. In conclusion, this case further expands the genetic spectrum of ACO2 variants and defines a complex case of severe neonatal neurometabolic disorder.
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Affiliation(s)
- Federica Silvia Ricci
- Division of Child and Adolescent Neuropsychiatry, Department of Public Health and Pediatric SciencesUniversity of TurinTurinItaly
| | - Serena Stanga
- Department of Neuroscience “Rita Levi Montalcini”Neuroscience Institute Cavalieri Ottolenghi, University of TurinTurinItaly
| | - Mariarosa Mezzanotte
- Department of Neuroscience “Rita Levi Montalcini”Neuroscience Institute Cavalieri Ottolenghi, University of TurinTurinItaly
| | - Cristina Marinaccio
- Division of Child and Adolescent Neuropsychiatry, Department of Child Care and PathologyChildren Hospital “Regina Margherita”TurinItaly
| | - Rossella D'Alessandro
- Division of Child and Adolescent Neuropsychiatry, Department of Child Care and PathologyChildren Hospital “Regina Margherita”TurinItaly
| | - Alessandra Somà
- Division of Child and Adolescent Neuropsychiatry, Department of Public Health and Pediatric SciencesUniversity of TurinTurinItaly
| | - Stefano Sottemano
- Division of Child and Adolescent Neuropsychiatry, Department of Public Health and Pediatric SciencesUniversity of TurinTurinItaly
| | - Alessandra Conio
- Pediatric Intensive Care Unit, Anesthesia, Resuscitation and Emergency DepartmentUniversity of TurinTurinItaly
| | - Giovanni Morana
- Neuroradiology Unit, Department of Neuroscience “Rita Levi Montalcini”University of TurinTurinItaly
| | - Marco Spada
- Division of Child and Adolescent Neuropsychiatry, Department of Child Care and PathologyChildren Hospital “Regina Margherita”TurinItaly
| | - Marina Boido
- Department of Neuroscience “Rita Levi Montalcini”Neuroscience Institute Cavalieri Ottolenghi, University of TurinTurinItaly
| | - Tiziana E. Mongini
- Division of Neurology 1, Department of Neuroscience “Rita Levi Montalcini”University of TurinTurinItaly
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Zhu J, Xu F, Lai H, Yuan H, Li XY, Hu J, Li W, Liu L, Wang C. ACO2 deficiency increases vulnerability to Parkinson's disease via dysregulating mitochondrial function and histone acetylation-mediated transcription of autophagy genes. Commun Biol 2023; 6:1201. [PMID: 38007539 PMCID: PMC10676364 DOI: 10.1038/s42003-023-05570-y] [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: 03/20/2023] [Accepted: 11/10/2023] [Indexed: 11/27/2023] Open
Abstract
Parkinson's disease (PD) is characterized by α-synuclein aggregation in dopaminergic (DA) neurons, which are sensitive to oxidative stress. Mitochondria aconitase 2 (ACO2) is an essential enzyme in the tricarboxylic acid cycle that orchestrates mitochondrial and autophagic functions to energy metabolism. Though widely linked to diseases, its relation to PD has not been fully clarified. Here we revealed that the peripheral ACO2 activity was significantly decreased in PD patients and associated with their onset age and disease durations. The knock-in mouse and Drosophila models with the A252T variant displayed aggravated motor deficits and DA neuron degeneration after 6-OHDA and rotenone-induction, and the ACO2 knockdown or blockade cells showed features of mitochondrial and autophagic dysfunction. Moreover, the transcription of autophagy-related genes LC3 and Atg5 was significantly downregulated via inhibited histone acetylation at the H3K9 and H4K5 sites. These data provided multi-dimensional evidences supporting the essential roles of ACO2, and as a potential early biomarker to be used in clinical trials for assessing the effects of antioxidants in PD. Moreover, ameliorating energy metabolism by targeting ACO2 could be considered as a potential therapeutic strategy for PD and other neurodegenerative disorders.
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Affiliation(s)
- Junge Zhu
- Department of Neurology & Neurobiology, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing, 100053, China
| | - Fanxi Xu
- Department of Neurology & Neurobiology, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing, 100053, China
| | - Hong Lai
- Department of Neurology & Neurobiology, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing, 100053, China
- Department of Neurology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, 341000, China
| | - Huiyao Yuan
- Department of Biochemistry and Molecular Biology, Capital Medical University; School of Basic Medicine, Beijing, 100069, China
| | - Xu-Ying Li
- Department of Neurology & Neurobiology, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing, 100053, China
| | - Junya Hu
- Department of Neurology & Neurobiology, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing, 100053, China
| | - Wei Li
- Department of Neurology & Neurobiology, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing, 100053, China
- Department of Stroke Center, Central Hospital Affiliated to Shandong First Medical University, Jinan, 250000, China
| | - Lei Liu
- Department of Biochemistry and Molecular Biology, Capital Medical University; School of Basic Medicine, Beijing, 100069, China.
| | - Chaodong Wang
- Department of Neurology & Neurobiology, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing, 100053, China.
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Lail N, Pandey AK, Venkatesh S, Noland RD, Swanson G, Pain D, Branson HM, Suzuki CK, Yoon G. Child Neurology: Progressive Cerebellar Atrophy and Retinal Dystrophy: Clues to an Ultrarare ACO2-Related Neurometabolic Diagnosis. Neurology 2023; 101:e1567-e1571. [PMID: 37460232 PMCID: PMC10585704 DOI: 10.1212/wnl.0000000000207649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 05/31/2023] [Indexed: 10/11/2023] Open
Abstract
Pathogenic biallelic variants in ACO2, which encodes the enzyme mitochondrial aconitase, are associated with the very rare diagnosis of ACO2-related infantile cerebellar retinal degeneration (OMIM 614559). We describe the diagnostic odyssey of a 4-year-old female patient with profound global developmental delays, microcephaly, severe hypotonia, retinal dystrophy, seizures, and progressive cerebellar atrophy. Whole-exome sequencing revealed 2 variants in ACO2; c.2105_2106delAG (p.Gln702ArgfsX9), a likely pathogenic variant, and c.988C>T (p.Pro330Ser) which was classified as a variant of uncertain significance (VUS). While the VUS was confirmed to be maternally inherited, the phase of the other variant could not be confirmed due to lack of a paternal sample. Functional biochemical studies were performed on a research basis to clarify the interpretation of the VUS, which enabled clinical confirmation of the diagnosis of ACO2-related infantile cerebellar retinal degeneration for our patient.
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Affiliation(s)
- Noor Lail
- From the Division of Clinical and Metabolic Genetics (N.L., G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada; Department of Pharmacology, Physiology and Neuroscience (A.K.P., D.P.), and Department of Microbiology, Biochemistry and Molecular Genetics (S.V., R.D.N., G.S., C.K.S.), Rutgers-New Jersey Medical School, Newark; and Division of Neuroradiology (H.M.B.), Department of Diagnostic Imaging, and Division of Neurology (G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada. S. Venkatesh is now with Department of Physiology and Pharmacology, School of Medicine, West Virginia University, Morgantown
| | - Ashutosh K Pandey
- From the Division of Clinical and Metabolic Genetics (N.L., G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada; Department of Pharmacology, Physiology and Neuroscience (A.K.P., D.P.), and Department of Microbiology, Biochemistry and Molecular Genetics (S.V., R.D.N., G.S., C.K.S.), Rutgers-New Jersey Medical School, Newark; and Division of Neuroradiology (H.M.B.), Department of Diagnostic Imaging, and Division of Neurology (G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada. S. Venkatesh is now with Department of Physiology and Pharmacology, School of Medicine, West Virginia University, Morgantown
| | - Sundararajan Venkatesh
- From the Division of Clinical and Metabolic Genetics (N.L., G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada; Department of Pharmacology, Physiology and Neuroscience (A.K.P., D.P.), and Department of Microbiology, Biochemistry and Molecular Genetics (S.V., R.D.N., G.S., C.K.S.), Rutgers-New Jersey Medical School, Newark; and Division of Neuroradiology (H.M.B.), Department of Diagnostic Imaging, and Division of Neurology (G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada. S. Venkatesh is now with Department of Physiology and Pharmacology, School of Medicine, West Virginia University, Morgantown
| | - Roberto D Noland
- From the Division of Clinical and Metabolic Genetics (N.L., G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada; Department of Pharmacology, Physiology and Neuroscience (A.K.P., D.P.), and Department of Microbiology, Biochemistry and Molecular Genetics (S.V., R.D.N., G.S., C.K.S.), Rutgers-New Jersey Medical School, Newark; and Division of Neuroradiology (H.M.B.), Department of Diagnostic Imaging, and Division of Neurology (G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada. S. Venkatesh is now with Department of Physiology and Pharmacology, School of Medicine, West Virginia University, Morgantown
| | - Gabriel Swanson
- From the Division of Clinical and Metabolic Genetics (N.L., G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada; Department of Pharmacology, Physiology and Neuroscience (A.K.P., D.P.), and Department of Microbiology, Biochemistry and Molecular Genetics (S.V., R.D.N., G.S., C.K.S.), Rutgers-New Jersey Medical School, Newark; and Division of Neuroradiology (H.M.B.), Department of Diagnostic Imaging, and Division of Neurology (G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada. S. Venkatesh is now with Department of Physiology and Pharmacology, School of Medicine, West Virginia University, Morgantown
| | - Debkumar Pain
- From the Division of Clinical and Metabolic Genetics (N.L., G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada; Department of Pharmacology, Physiology and Neuroscience (A.K.P., D.P.), and Department of Microbiology, Biochemistry and Molecular Genetics (S.V., R.D.N., G.S., C.K.S.), Rutgers-New Jersey Medical School, Newark; and Division of Neuroradiology (H.M.B.), Department of Diagnostic Imaging, and Division of Neurology (G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada. S. Venkatesh is now with Department of Physiology and Pharmacology, School of Medicine, West Virginia University, Morgantown
| | - Helen M Branson
- From the Division of Clinical and Metabolic Genetics (N.L., G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada; Department of Pharmacology, Physiology and Neuroscience (A.K.P., D.P.), and Department of Microbiology, Biochemistry and Molecular Genetics (S.V., R.D.N., G.S., C.K.S.), Rutgers-New Jersey Medical School, Newark; and Division of Neuroradiology (H.M.B.), Department of Diagnostic Imaging, and Division of Neurology (G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada. S. Venkatesh is now with Department of Physiology and Pharmacology, School of Medicine, West Virginia University, Morgantown
| | - Carolyn K Suzuki
- From the Division of Clinical and Metabolic Genetics (N.L., G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada; Department of Pharmacology, Physiology and Neuroscience (A.K.P., D.P.), and Department of Microbiology, Biochemistry and Molecular Genetics (S.V., R.D.N., G.S., C.K.S.), Rutgers-New Jersey Medical School, Newark; and Division of Neuroradiology (H.M.B.), Department of Diagnostic Imaging, and Division of Neurology (G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada. S. Venkatesh is now with Department of Physiology and Pharmacology, School of Medicine, West Virginia University, Morgantown
| | - Grace Yoon
- From the Division of Clinical and Metabolic Genetics (N.L., G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada; Department of Pharmacology, Physiology and Neuroscience (A.K.P., D.P.), and Department of Microbiology, Biochemistry and Molecular Genetics (S.V., R.D.N., G.S., C.K.S.), Rutgers-New Jersey Medical School, Newark; and Division of Neuroradiology (H.M.B.), Department of Diagnostic Imaging, and Division of Neurology (G.Y.), Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Ontario, Canada. S. Venkatesh is now with Department of Physiology and Pharmacology, School of Medicine, West Virginia University, Morgantown.
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5
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Fink JK. The hereditary spastic paraplegias. HANDBOOK OF CLINICAL NEUROLOGY 2023; 196:59-88. [PMID: 37620092 DOI: 10.1016/b978-0-323-98817-9.00022-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/26/2023]
Abstract
The hereditary spastic paraplegias (HSPs) are a group of more than 90 genetic disorders in which lower extremity spasticity and weakness are either the primary neurologic impairments ("uncomplicated HSP") or when accompanied by other neurologic deficits ("complicated HSP"), important features of the clinical syndrome. Various genetic types of HSP are inherited such as autosomal dominant, autosomal recessive, X-linked, and maternal (mitochondrial) traits. Symptoms that begin in early childhood may be nonprogressive and resemble spastic diplegic cerebral palsy. Symptoms that begin later, typically progress insidiously over a number of years. Genetic testing is able to confirm the diagnosis for many subjects. Insights from gene discovery indicate that abnormalities in diverse molecular processes underlie various forms of HSP, including disturbance in axon transport, endoplasmic reticulum morphogenesis, vesicle transport, lipid metabolism, and mitochondrial function. Pathologic studies in "uncomplicated" HSP have shown axon degeneration particularly involving the distal ends of corticospinal tracts and dorsal column fibers. Treatment is limited to symptom reduction including amelioration of spasticity, reducing urinary urgency, proactive physical therapy including strengthening, stretching, balance, and agility exercise.
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Affiliation(s)
- John K Fink
- Department of Neurology, University of Michigan, Ann Arbor, MI, United States.
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Panwala TF, Garcia-Santibanez R, Vizcarra JA, Garcia AG, Verma S. Childhood-Onset Hereditary Spastic Paraplegia (HSP): A Case Series and Review of Literature. Pediatr Neurol 2022; 130:7-13. [PMID: 35303589 DOI: 10.1016/j.pediatrneurol.2022.02.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 01/30/2022] [Accepted: 02/25/2022] [Indexed: 11/17/2022]
Abstract
BACKGROUND Hereditary spastic paraplegia (HSP) encompasses several rare genetic disorders characterized by progressive lower extremity spasticity and weakness caused by corticospinal tract degeneration. Published literature on genetically confirmed pediatric HSP cases is limited. METHODS We conducted a retrospective review of childhood-onset HSP cases followed in the neuromuscular clinics at Children's and Emory Healthcare in Atlanta. Clinical presentation, family history, examination, electrodiagnostic data, neuroimaging, genetic test results, comorbidities, and treatment were recorded. RESULTS Sixteen patients with HSP (eight males, eight females) with a mean age 19 years ± 15.7 years were included. Ten patients (66%) presented with gait difficulty. Seven (44%) were ambulatory at the last clinic follow-up visit with an average disease duration of 7.4 years. Genetically confirmed etiologies included SPAST (3 patients), MARS (2), KIF1A (2), KIF5A (1), SACS (1), SPG7 (1), REEP1 (1), PNPT1 (1), MT-ATP6 (1), and ATL1 (1). Symptom onset to genetic confirmation on an average was 8.2 years. Sensory motor axonal polyneuropathy was found in seven patients, and two exhibited cerebellar atrophy on magnetic resonance imaging (MRI) of the brain. Neurological comorbidities included developmental delay (n = 9), autism (n = 5), epilepsy (n = 3), and attention-deficit/hyperactivity disorder (n = 2). CONCLUSIONS In our study, a significant proportion (70%) of subjects with childhood-onset HSP had comorbid neurocognitive deficits, polyneuropathy with or without neuroimaging abnormalities, and rare genetic etiology. Genetic diagnosis was established either through inherited genetic neuropathy panel or whole-exome sequencing, which supports the utility of whole-exome sequencing in aiding in HSP diagnosis.
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Affiliation(s)
- Tanya F Panwala
- Florida Atlantic University, Charles E. Schmidt College of Medicine, Boca Raton, Florida
| | | | - Joaquin A Vizcarra
- Department of Neurology, Emory University School of Medicine, Atlanta, Georgia
| | - Aixa Gonzalez Garcia
- Department of Pediatrics, Genetics Section, University of Arkansas for Medical Sciences and Arkansas Children's Hospital, Little Rock, Arkansas
| | - Sumit Verma
- Department of Neurology, Emory University School of Medicine, Atlanta, Georgia; Division of Pediatric Neurology, Children's Healthcare of Atlanta and Emory University School of Medicine, Atlanta, Georgia.
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Ha DJ, Park J, Seo GH, Lee K, Kwon YS, Lee JE, Kim SJ. Case Report: Infantile Cerebellar-Retinal Degeneration With Compound Heterozygous Variants in ACO2 Gene-Long-Term Follow-Up of a Sibling. Front Genet 2022; 13:729980. [PMID: 35368710 PMCID: PMC8965713 DOI: 10.3389/fgene.2022.729980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 02/09/2022] [Indexed: 11/13/2022] Open
Abstract
Infantile cerebellar-retinal degeneration (ICRD) is an extremely rare, infantile-onset neuro-degenerative disease, characterized by autosomal recessive inherited, global developmental delay (GDD), progressive cerebellar and cortical atrophy, and retinal degeneration. In 2012, a biallelic pathogenic variant in ACO2 gene (NM_001098.3) was found to be causative of this disease. To date, approximately 44 variants displaying various clinical features have been reported. Here, we report a case of two siblings with compound heterozygous variants in the ACO2 gene. Two siblings without perinatal problems were born to healthy non-consanguineous Korean parents. They showed GDD and seizures since infancy. Their first brain magnetic resonance imaging (MRI), electroencephalography, and metabolic workup revealed no abnormal findings. As they grew, they developed symptoms including ataxia, dysmetria, poor sitting balance, and myopia. Follow-up brain MRI findings revealed atrophy of the cerebellum and optic nerve. Through exome sequencing of both siblings and their parents, we identified the following compound heterozygous variants in the ACO2: c.85C > T (p.Arg29Trp) and c.2303C > A (p.Ala768Asp). These two variants were categorized as likely pathogenic based on ACMG/AMP guidelines. In conclusion, this case help to broaden the genetic and clinical spectrum of the ACO2 variants associated with ICRD. We have also documented the long-term clinical course and serial brain MRI findings for two patients with this extremely rare disease.
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Affiliation(s)
- Dong Jun Ha
- Department of Pediatrics, Inha University Hospital, Inha University College of Medicine, Incheon, South Korea
| | - Jisun Park
- Department of Pediatrics, Inha University Hospital, Inha University College of Medicine, Incheon, South Korea.,Northwest Gyeonggi Regional Center for Rare Disease, Inha University Hospital, Incheon, Korea
| | | | | | - Young Se Kwon
- Department of Pediatrics, Inha University Hospital, Inha University College of Medicine, Incheon, South Korea.,Northwest Gyeonggi Regional Center for Rare Disease, Inha University Hospital, Incheon, Korea
| | - Ji Eun Lee
- Department of Pediatrics, Inha University Hospital, Inha University College of Medicine, Incheon, South Korea.,Northwest Gyeonggi Regional Center for Rare Disease, Inha University Hospital, Incheon, Korea
| | - Su Jin Kim
- Department of Pediatrics, Inha University Hospital, Inha University College of Medicine, Incheon, South Korea.,Northwest Gyeonggi Regional Center for Rare Disease, Inha University Hospital, Incheon, Korea
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8
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Malformations of cerebral development and clues from the peripheral nervous system: A systematic literature review. Eur J Paediatr Neurol 2022; 37:155-164. [PMID: 34535379 DOI: 10.1016/j.ejpn.2021.08.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 08/19/2021] [Accepted: 08/24/2021] [Indexed: 11/22/2022]
Abstract
Clinical manifestations of malformations of cortical development (MCD) are variable and can range from mild to severe intellectual disability, cerebral palsy and drug-resistant epilepsy. Besides common clinical features, non-specific or more subtle clinical symptoms may be present in association with different types of MCD. Especially in severely affected individuals, subtle but specific underlying clinical symptoms can be overlooked or overshadowed by the global clinical presentation. To facilitate the interpretation of genetic variants detailed clinical information is indispensable. Detailed (neurological) examination can be helpful in assisting with the diagnostic trajectory, both when referring for genetic work-up as well as when interpreting data from molecular genetic testing. This systematic literature review focusses on different clues derived from the neurological examination and potential further work-up triggered by these signs and symptoms in genetically defined MCDs. A concise overview of specific neurological findings and their associations with MCD subtype and genotype are presented, easily applicable in daily clinical practice. The following pathologies will be discussed: neuropathy, myopathy, muscular dystrophies and spastic paraplegia. In the discussion section, tips and pitfalls are illustrated to improve clinical outcome in the future.
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9
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Elsayed LEO, Eltazi IZ, Ahmed AE, Stevanin G. Insights into Clinical, Genetic, and Pathological Aspects of Hereditary Spastic Paraplegias: A Comprehensive Overview. Front Mol Biosci 2021; 8:690899. [PMID: 34901147 PMCID: PMC8662366 DOI: 10.3389/fmolb.2021.690899] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Accepted: 10/19/2021] [Indexed: 12/31/2022] Open
Abstract
Hereditary spastic paraplegias (HSP) are a heterogeneous group of motor neurodegenerative disorders that have the core clinical presentation of pyramidal syndrome which starts typically in the lower limbs. They can present as pure or complex forms with all classical modes of monogenic inheritance reported. To date, there are more than 100 loci/88 spastic paraplegia genes (SPG) involved in the pathogenesis of HSP. New patterns of inheritance are being increasingly identified in this era of huge advances in genetic and functional studies. A wide range of clinical symptoms and signs are now reported to complicate HSP with increasing overall complexity of the clinical presentations considered as HSP. This is especially true with the emergence of multiple HSP phenotypes that are situated in the borderline zone with other neurogenetic disorders. The genetic diagnostic approaches and the utilized techniques leave a diagnostic gap of 25% in the best studies. In this review, we summarize the known types of HSP with special focus on those in which spasticity is the principal clinical phenotype ("SPGn" designation). We discuss their modes of inheritance, clinical phenotypes, underlying genetics, and molecular pathways, providing some observations about therapeutic opportunities gained from animal models and functional studies. This review may pave the way for more analytic approaches that take into consideration the overall picture of HSP. It will shed light on subtle associations that can explain the occurrence of the disease and allow a better understanding of its observed variations. This should help in the identification of future biomarkers, predictors of disease onset and progression, and treatments for both better functional outcomes and quality of life.
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Affiliation(s)
- Liena E. O. Elsayed
- Department of Basic Sciences, College of Medicine, Princess Nourah bint Abdulrahman University [PNU], Riyadh, Saudi Arabia
- Faculty of Medicine, University of Khartoum, Khartoum, Sudan
| | | | - Ammar E. Ahmed
- Faculty of Medicine, University of Khartoum, Khartoum, Sudan
| | - Giovanni Stevanin
- Institut du Cerveau – Paris Brain Institute - ICM, Sorbonne Université, INSERM, CNRS, APHP, Paris, France
- CNRS, INCIA, Université de Bordeaux, Bordeaux, France
- Ecole Pratique des Hautes Etudes, EPHE, PSL Research University, Paris, France
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10
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Guehlouz K, Foulonneau T, Amati-Bonneau P, Charif M, Colin E, Bris C, Desquiret-Dumas V, Milea D, Gohier P, Procaccio V, Bonneau D, den Dunnen JT, Lenaers G, Reynier P, Ferré M. ACO2 clinicobiological dataset with extensive phenotype ontology annotation. Sci Data 2021; 8:205. [PMID: 34354088 PMCID: PMC8342444 DOI: 10.1038/s41597-021-00984-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 06/22/2021] [Indexed: 11/08/2022] Open
Abstract
Pathogenic variants of the aconitase 2 gene (ACO2) are responsible for a broad clinical spectrum involving optic nerve degeneration, ranging from isolated optic neuropathy with recessive or dominant inheritance, to complex neurodegenerative syndromes with recessive transmission. We created the first public locus-specific database (LSDB) dedicated to ACO2 within the "Global Variome shared LOVD" using exclusively the Human Phenotype Ontology (HPO), a standard vocabulary for describing phenotypic abnormalities. All the variants and clinical cases listed in the literature were incorporated into the database, from which we produced a dataset. We followed a rational and comprehensive approach based on the HPO thesaurus, demonstrating that ACO2 patients should not be classified separately between isolated and syndromic cases. Our data highlight that certain syndromic patients do not have optic neuropathy and provide support for the classification of the recurrent pathogenic variants c.220C>G and c.336C>G as likely pathogenic. Overall, our data records demonstrate that the clinical spectrum of ACO2 should be considered as a continuum of symptoms and refines the classification of some common variants.
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Affiliation(s)
- Khadidja Guehlouz
- Département d'Ophtalmologie, Centre Hospitalier Universitaire d'Angers, Angers, France
| | - Thomas Foulonneau
- Unité Mixte de Recherche MITOVASC, CNRS 6015/INSERM 1083, Université d'Angers, Angers, France
| | - Patrizia Amati-Bonneau
- Unité Mixte de Recherche MITOVASC, CNRS 6015/INSERM 1083, Université d'Angers, Angers, France
- Département de Biochimie et Génétique, Centre Hospitalier Universitaire d'Angers, Angers, France
| | - Majida Charif
- Unité Mixte de Recherche MITOVASC, CNRS 6015/INSERM 1083, Université d'Angers, Angers, France
- Genetics, and immuno-cell therapy Team, Mohammed First University, Oujda, Morocco
| | - Estelle Colin
- Unité Mixte de Recherche MITOVASC, CNRS 6015/INSERM 1083, Université d'Angers, Angers, France
- Département de Biochimie et Génétique, Centre Hospitalier Universitaire d'Angers, Angers, France
| | - Céline Bris
- Unité Mixte de Recherche MITOVASC, CNRS 6015/INSERM 1083, Université d'Angers, Angers, France
- Département de Biochimie et Génétique, Centre Hospitalier Universitaire d'Angers, Angers, France
| | - Valérie Desquiret-Dumas
- Unité Mixte de Recherche MITOVASC, CNRS 6015/INSERM 1083, Université d'Angers, Angers, France
- Département de Biochimie et Génétique, Centre Hospitalier Universitaire d'Angers, Angers, France
| | - Dan Milea
- Singapore National Eye Centre, Singapore Eye Research Institute, Duke-NUS, Singapore
| | - Philippe Gohier
- Département d'Ophtalmologie, Centre Hospitalier Universitaire d'Angers, Angers, France
| | - Vincent Procaccio
- Unité Mixte de Recherche MITOVASC, CNRS 6015/INSERM 1083, Université d'Angers, Angers, France
- Département de Biochimie et Génétique, Centre Hospitalier Universitaire d'Angers, Angers, France
| | - Dominique Bonneau
- Unité Mixte de Recherche MITOVASC, CNRS 6015/INSERM 1083, Université d'Angers, Angers, France
- Département de Biochimie et Génétique, Centre Hospitalier Universitaire d'Angers, Angers, France
| | - Johan T den Dunnen
- Human Genetics and Clinical Genetics, Leiden University Medical Centre, Leiden, The Netherlands
| | - Guy Lenaers
- Unité Mixte de Recherche MITOVASC, CNRS 6015/INSERM 1083, Université d'Angers, Angers, France
| | - Pascal Reynier
- Unité Mixte de Recherche MITOVASC, CNRS 6015/INSERM 1083, Université d'Angers, Angers, France
- Département de Biochimie et Génétique, Centre Hospitalier Universitaire d'Angers, Angers, France
| | - Marc Ferré
- Unité Mixte de Recherche MITOVASC, CNRS 6015/INSERM 1083, Université d'Angers, Angers, France.
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11
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Vavouraki N, Tomkins JE, Kara E, Houlden H, Hardy J, Tindall MJ, Lewis PA, Manzoni C. Integrating protein networks and machine learning for disease stratification in the Hereditary Spastic Paraplegias. iScience 2021; 24:102484. [PMID: 34113825 PMCID: PMC8169945 DOI: 10.1016/j.isci.2021.102484] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 04/01/2021] [Accepted: 04/23/2021] [Indexed: 12/14/2022] Open
Abstract
The Hereditary Spastic Paraplegias are a group of neurodegenerative diseases characterized by spasticity and weakness in the lower body. Owing to the combination of genetic diversity and variable clinical presentation, the Hereditary Spastic Paraplegias are a strong candidate for protein-protein interaction network analysis as a tool to understand disease mechanism(s) and to aid functional stratification of phenotypes. In this study, experimentally validated human data were used to create a protein-protein interaction network based on the causative genes. Network evaluation as a combination of topological analysis and functional annotation led to the identification of core proteins in putative shared biological processes, such as intracellular transport and vesicle trafficking. The application of machine learning techniques suggested a functional dichotomy linked with distinct sets of clinical presentations, indicating that there is scope to further classify conditions currently described under the same umbrella-term of Hereditary Spastic Paraplegias based on specific molecular mechanisms of disease.
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Affiliation(s)
- Nikoleta Vavouraki
- School of Pharmacy, University of Reading, Reading, RG6 6AX, UK
- Department of Mathematics and Statistics, University of Reading, Reading, RG6 6AX, UK
| | | | - Eleanna Kara
- Department of Neurodegenerative Disease, UCL Queen Square Institute of Neurology, London, WC1N 3BG, UK
| | - Henry Houlden
- Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology, London, WC1N 3BG, UK
| | - John Hardy
- Department of Neurodegenerative Disease, UCL Queen Square Institute of Neurology, London, WC1N 3BG, UK
- UK Dementia Research Institute at UCL and Department of Neurodegenerative Disease, UCL IoN, UCL London, W1T 7NF UK
- Reta Lila Weston Institute, UCL IoN, 1 Wakefield Street, London, WC1N 1PJ, UK
- UCL Movement Disorders Centre, Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, WC1N 3BG, UK
- Institute for Advanced Study, The Hong Kong University of Science and Technology, Hong Kong SAR, China
- Aligning Science Across Parkinson's (ASAP) Collaborative Research Network, Chevy Chase, MD 20815, USA
| | - Marcus J. Tindall
- Department of Mathematics and Statistics, University of Reading, Reading, RG6 6AX, UK
- Institute of Cardiovascular and Metabolic Research, University of Reading, Reading, RG6 6AS, UK
| | - Patrick A. Lewis
- School of Pharmacy, University of Reading, Reading, RG6 6AX, UK
- Department of Neurodegenerative Disease, UCL Queen Square Institute of Neurology, London, WC1N 3BG, UK
- Aligning Science Across Parkinson's (ASAP) Collaborative Research Network, Chevy Chase, MD 20815, USA
- Department of Comparative Biomedical Sciences, Royal Veterinary College, London, NW1 0TU, UK
| | - Claudia Manzoni
- School of Pharmacy, University of Reading, Reading, RG6 6AX, UK
- School of Pharmacy, University College London, London, WC1N 1AX, UK
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12
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Tozawa T, Nishimura A, Ueno T, Shikata A, Taura Y, Yoshida T, Nakagawa N, Wada T, Kosugi S, Uehara T, Takenouchi T, Kosaki K, Chiyonobu T. Complex hereditary spastic paraplegia associated with episodic visual loss caused by ACO2 variants. Hum Genome Var 2021; 8:4. [PMID: 33500398 PMCID: PMC7838304 DOI: 10.1038/s41439-021-00136-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 12/15/2020] [Accepted: 12/15/2020] [Indexed: 11/09/2022] Open
Abstract
Most patients with homozygous or compound heterozygous pathogenic ACO2 variants present with muscular hypotonia features, namely, infantile cerebellar-retinal degeneration. Recently, two studies reported rare familial cases of ACO2 variants presenting as complex hereditary spastic paraplegia (HSP) with broad clinical spectra. Here, we report the case of a 20-year-old Japanese woman with complex HSP caused by compound heterozygous ACO2 variants, revealing a new phenotype of episodic visual loss during febrile illness.
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Affiliation(s)
- Takenori Tozawa
- Department of Pediatrics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan. .,Department of Pediatrics, Ayabe City Hospital, Ayabe, Japan.
| | - Akira Nishimura
- Department of Neonatology, Japanese Red Cross Society Kyoto Daiichi Hospital, Kyoto, Japan
| | - Tamaki Ueno
- Department of Pediatrics, Ayabe City Hospital, Ayabe, Japan.,Department of Pediatrics, Tokai Central Hospital, Kakamigahara, Japan
| | - Akane Shikata
- Kyoto Prefectural Maizuru Rehabilitation Center for Children, Maizuru, Japan
| | - Yoshihiro Taura
- Department of Pediatrics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Takeshi Yoshida
- Department of Pediatrics, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Naoko Nakagawa
- Department of Medical Ethics/Medical Genetics, Kyoto University School of Public Health, Kyoto, Japan
| | - Takahito Wada
- Department of Medical Ethics/Medical Genetics, Kyoto University School of Public Health, Kyoto, Japan
| | - Shinji Kosugi
- Department of Medical Ethics/Medical Genetics, Kyoto University School of Public Health, Kyoto, Japan
| | - Tomoko Uehara
- Center for Medical Genetics, Keio University School of Medicine, Tokyo, Japan
| | - Toshiki Takenouchi
- Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan
| | - Kenjiro Kosaki
- Center for Medical Genetics, Keio University School of Medicine, Tokyo, Japan
| | - Tomohiro Chiyonobu
- Department of Pediatrics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
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13
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Charif M, Gueguen N, Ferré M, Elkarhat Z, Khiati S, LeMao M, Chevrollier A, Desquiret-Dumas V, Goudenège D, Bris C, Kane S, Alban J, Chupin S, Wetterwald C, Caporali L, Tagliavini F, LaMorgia C, Carbonelli M, Jurkute N, Barakat A, Gohier P, Verny C, Barth M, Procaccio V, Bonneau D, Zanlonghi X, Meunier I, Weisschuh N, Schimpf-Linzenbold S, Tonagel F, Kellner U, Yu-Wai-Man P, Carelli V, Wissinger B, Amati-Bonneau P, Reynier P, Lenaers G. Dominant ACO2 mutations are a frequent cause of isolated optic atrophy. Brain Commun 2021; 3:fcab063. [PMID: 34056600 PMCID: PMC8152918 DOI: 10.1093/braincomms/fcab063] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 02/11/2021] [Accepted: 02/12/2021] [Indexed: 12/24/2022] Open
Abstract
Biallelic mutations in ACO2, encoding the mitochondrial aconitase 2, have been identified in individuals with neurodegenerative syndromes, including infantile cerebellar retinal degeneration and recessive optic neuropathies (locus OPA9). By screening European cohorts of individuals with genetically unsolved inherited optic neuropathies, we identified 61 cases harbouring variants in ACO2, among whom 50 carried dominant mutations, emphasizing for the first time the important contribution of ACO2 monoallelic pathogenic variants to dominant optic atrophy. Analysis of the ophthalmological and clinical data revealed that recessive cases are affected more severely than dominant cases, while not significantly earlier. In addition, 27% of the recessive cases and 11% of the dominant cases manifested with extraocular features in addition to optic atrophy. In silico analyses of ACO2 variants predicted their deleterious impacts on ACO2 biophysical properties. Skin derived fibroblasts from patients harbouring dominant and recessive ACO2 mutations revealed a reduction of ACO2 abundance and enzymatic activity, and the impairment of the mitochondrial respiration using citrate and pyruvate as substrates, while the addition of other Krebs cycle intermediates restored a normal respiration, suggesting a possible short-cut adaptation of the tricarboxylic citric acid cycle. Analysis of the mitochondrial genome abundance disclosed a significant reduction of the mitochondrial DNA amount in all ACO2 fibroblasts. Overall, our data position ACO2 as the third most frequently mutated gene in autosomal inherited optic neuropathies, after OPA1 and WFS1, and emphasize the crucial involvement of the first steps of the Krebs cycle in the maintenance and survival of retinal ganglion cells.
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Affiliation(s)
- Majida Charif
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
- Genetics and Immuno-Cell Therapy Team, Mohammed First University, Oujda, Morocco
| | - Naïg Gueguen
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
| | - Marc Ferré
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
| | - Zouhair Elkarhat
- Laboratory of Genomics and Human Genetics, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Salim Khiati
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
| | - Morgane LeMao
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
| | - Arnaud Chevrollier
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
| | - Valerie Desquiret-Dumas
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
| | - David Goudenège
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
| | - Céline Bris
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
| | - Selma Kane
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
| | - Jennifer Alban
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
| | - Stéphanie Chupin
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
| | | | - Leonardo Caporali
- Unit of Neurology, Department of Biomedical and NeuroMotor Sciences (DIBINEM), University of Bologna, Bologna, Italy
| | - Francesca Tagliavini
- Unit of Neurology, Department of Biomedical and NeuroMotor Sciences (DIBINEM), University of Bologna, Bologna, Italy
| | - Chiara LaMorgia
- Unit of Neurology, Department of Biomedical and NeuroMotor Sciences (DIBINEM), University of Bologna, Bologna, Italy
- IRCCS Institute of Neurological Sciences of Bologna, Bellaria Hospital, Bologna, Italy
| | - Michele Carbonelli
- Unit of Neurology, Department of Biomedical and NeuroMotor Sciences (DIBINEM), University of Bologna, Bologna, Italy
| | - Neringa Jurkute
- Moorfields Eye Hospital, London, UK
- UCL Institute of Ophthalmology, University College London, London, UK
- Cambridge Eye Unit, Addenbrooke’s Hospital, Cambridge University Hospitals, Cambridge, UK
- Cambridge Centre for Brain Repair and MRC Mitochondrial Biology Unit, Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Abdelhamid Barakat
- Laboratory of Genomics and Human Genetics, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Philippe Gohier
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
| | - Christophe Verny
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
- Centre de référence des Maladies Neurogénétiques, Département de Neurologie, CHU d’Angers, Angers, France
| | - Magalie Barth
- Department of Pediatrics, Competence Center of Inherited Metabolic Disorders, Angers Hospital, Angers, France
| | - Vincent Procaccio
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
| | - Dominique Bonneau
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
| | | | - Isabelle Meunier
- National Center for Rare Diseases, Genetics of Sensory Diseases, University Hospital, Montpellier, France
| | - Nicole Weisschuh
- Institute for Ophthalmic Research, Centre for Ophthalmology, University of Tübingen, Tübingen, Germany
| | | | - Felix Tonagel
- Centre for Ophthalmology, University of Tübingen, Tübingen, Germany
| | - Ulrich Kellner
- Rare Retinal Disease Center, AugenZentrum Siegburg, MVZ ADTC Siegburg GmbH, Siegburg, Germany
- RetinaScience, 53113 Bonn, Germany
| | - Patrick Yu-Wai-Man
- Moorfields Eye Hospital, London, UK
- UCL Institute of Ophthalmology, University College London, London, UK
- Cambridge Eye Unit, Addenbrooke’s Hospital, Cambridge University Hospitals, Cambridge, UK
- Cambridge Centre for Brain Repair and MRC Mitochondrial Biology Unit, Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Valerio Carelli
- Unit of Neurology, Department of Biomedical and NeuroMotor Sciences (DIBINEM), University of Bologna, Bologna, Italy
- IRCCS Institute of Neurological Sciences of Bologna, Bellaria Hospital, Bologna, Italy
| | - Bernd Wissinger
- Institute for Ophthalmic Research, Centre for Ophthalmology, University of Tübingen, Tübingen, Germany
| | - Patrizia Amati-Bonneau
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
| | - Pascal Reynier
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
| | | | - Guy Lenaers
- Université Angers, MitoLab Team, UMR CNRS 6015 - INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France
- Correspondence to: Guy Lenaers MitoLab Team, Mitochondrial Medicine Research Centre, MitoVasc Unit, Université d'Angers UMR CNRS 6015, INSERM U1083, CHU Bât IRIS/IBS, Rue des Capucins 49933 Angers cedex 9, France E-mail:
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14
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Abbas S, Brugger B, Zubair M, Gul S, Blatterer J, Wenninger J, Rehman K, Tatrai B, Khan MA, Windpassinger C. Exome sequencing of a Pakistani family with spastic paraplegia identified an 18 bp deletion in the cytochrome B5 domain of FA2H. Neurol Res 2020; 43:133-140. [PMID: 33246395 DOI: 10.1080/01616412.2020.1831329] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Hereditary spastic paraplegias (HSPs) are a diverse class of neurodegenerative disorders that mainly affect the corticospinal tract of the body and result in various clinical conditions such as lower limb spasticity and muscle weakness in the lower extremities. Worldwide, more than 70 chromosomal loci/genes have been reported to be associated with HSPs, out of which, six genes viz., ATL1, FA2H, GJC2, AP4E1, ALDH18A1 and ATP13A2 have been mapped in Pakistani families. In the present genetic study, we report on a large consanguineous Pakistani family with a complex form of HSP segregating with a 18 bp deletion in the first exon of the Fatty Acid 2-Hydroxylase (FA2H) gene (NM_024306.5:c.159_176del). The identified in-frame deletion results in loss of six amino acids (p.Arg53_Ile58del) within the cytochrome B5 domain of the protein. FA2H is required for alpha-hydroxylation of free fatty acids to form alpha-hydroxylated sphingolipids. Its cytochrome b5-like heme-binding domain, which spans from residues 15 to 85, imparts the redox activity to FA2H. This mutation has previously been reported in a Pakistani family presenting with a similar form of complex HSP. Together with our findings the pathogenic role of the observed variant is further supported. Mutation studies on additional Pakistani families for FA2H will further elucidate its mutational spectrum, which may help in developing a prenatal diagnostic test for Khyber Pakhtunkhwa resident Pakistani families.
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Affiliation(s)
- Safdar Abbas
- Gomal Center of Biochemistry and Biotechnology, Gomal University , D.I.Khan, Pakistan
| | - Beatrice Brugger
- Diagnostic and Research Institute of Human Genetics, Medical University of Graz , Graz, Austria
| | - Muhammad Zubair
- Gomal Center of Biochemistry and Biotechnology, Gomal University , D.I.Khan, Pakistan.,Department of Cell and Developmental Biology, School of Life Sciences, University of Science and Technology , Hefei, China
| | - Sana Gul
- Gomal Center of Biochemistry and Biotechnology, Gomal University , D.I.Khan, Pakistan
| | - Jasmin Blatterer
- Diagnostic and Research Institute of Human Genetics, Medical University of Graz , Graz, Austria
| | - Julian Wenninger
- Diagnostic and Research Institute of Human Genetics, Medical University of Graz , Graz, Austria
| | - Khurram Rehman
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Gomal University , D.I.Khan, Pakistan
| | - Benjamin Tatrai
- Diagnostic and Research Institute of Human Genetics, Medical University of Graz , Graz, Austria
| | - Muzammil Ahmad Khan
- Gomal Center of Biochemistry and Biotechnology, Gomal University , D.I.Khan, Pakistan
| | - Christian Windpassinger
- Diagnostic and Research Institute of Human Genetics, Medical University of Graz , Graz, Austria
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15
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Haploinsufficiency due to a novel ACO2 deletion causes mitochondrial dysfunction in fibroblasts from a patient with dominant optic nerve atrophy. Sci Rep 2020; 10:16736. [PMID: 33028849 PMCID: PMC7541502 DOI: 10.1038/s41598-020-73557-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 09/02/2020] [Indexed: 01/20/2023] Open
Abstract
ACO2 is a mitochondrial protein, which is critically involved in the function of the tricarboxylic acid cycle (TCA), the maintenance of iron homeostasis, oxidative stress defense and the integrity of mitochondrial DNA (mtDNA). Mutations in the ACO2 gene were identified in patients suffering from a broad range of symptoms, including optic nerve atrophy, cortical atrophy, cerebellar atrophy, hypotonia, seizures and intellectual disabilities. In the present study, we identified a heterozygous 51 bp deletion (c.1699_1749del51) in ACO2 in a family with autosomal dominant inherited isolated optic atrophy. A complementation assay using aco1-deficient yeast revealed a growth defect for the mutant ACO2 variant substantiating a pathogenic effect of the deletion. We used patient-derived fibroblasts to characterize cellular phenotypes and found a decrease of ACO2 protein levels, while ACO2 enzyme activity was not affected compared to two age- and gender-matched control lines. Several parameters of mitochondrial function, including mitochondrial morphology, mitochondrial membrane potential or mitochondrial superoxide production, were not changed under baseline conditions. However, basal respiration, maximal respiration, and spare respiratory capacity were reduced in mutant cells. Furthermore, we observed a reduction of mtDNA copy number and reduced mtDNA transcription levels in ACO2-mutant fibroblasts. Inducing oxidative stress led to an increased susceptibility for cell death in ACO2-mutant fibroblasts compared to controls. Our study reveals that a monoallelic mutation in ACO2 is sufficient to promote mitochondrial dysfunction and increased vulnerability to oxidative stress as main drivers of cell death related to optic nerve atrophy.
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16
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Park JS, Kim MJ, Kim SY, Lim BC, Kim KJ, Seong MW, Lee JS, Chae JH. Novel compound heterozygous ACO2 mutations in an infant with progressive encephalopathy: A newly identified neurometabolic syndrome. Brain Dev 2020; 42:680-685. [PMID: 32713659 DOI: 10.1016/j.braindev.2020.07.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Revised: 06/18/2020] [Accepted: 07/06/2020] [Indexed: 11/17/2022]
Abstract
BACKGROUND The ACO2 gene encodes mitochondrial aconitase, the enzyme involved in the second step of the tricarboxylic acid cycle, catalyzing the interconversion of citrate into isocitrate. To date, fewer than 20 families harboring ACO2 mutations have been identified since the first report of a neurodegenerative disorder such as infantile cerebellar retinal degeneration in 2012. Subsequently, various phenotypes, from isolated optic atrophy to spastic paraplegia, have been recognized. Here, we report a case of a newly identified neurometabolic syndrome resulting from novel ACO2 mutations, which expands the genetic spectrum and increases clinical awareness in real-world clinical practice. CASE REPORT A 2-month-old boy presented with hypotonia, cyanosis, and abnormal eye movements. He had severe psychomotor retardation and intractable seizures manifesting with cyanotic episodes. Diffuse cerebral atrophy and bilateral optic atrophy were noted without cerebellar atrophy. With unremarkable results on comprehensive diagnostic work-up and targeted genetic tests, whole exome sequencing revealed novel compound heterozygous variants in ACO2 (p.Met393Ile and p.Cys448Ser), which were confirmed by Sanger sequencing. Although no definitive signs suggestive of metabolic disturbances or mitochondrial dysfunction have been noted in patients with ACO2 mutations to date, elevated plasma glutamate levels were noted in our case. CONCLUSION A high index of clinical suspicion and awareness of this disease may aid in the diagnosis of cases with unknown neurodegenerative diseases, facilitated by deep sequencing.
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Affiliation(s)
- Ji Soo Park
- Department of Pediatrics, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, Republic of Korea
| | - Man Jin Kim
- Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Republic of Korea; Rare Disease Center, Seoul National University Hospital, Seoul, Republic of Korea
| | - Soo Yeon Kim
- Department of Pediatrics, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, Republic of Korea; Pediatric Clinical Neuroscience Center, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, Republic of Korea
| | - Byung Chan Lim
- Department of Pediatrics, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, Republic of Korea; Pediatric Clinical Neuroscience Center, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, Republic of Korea
| | - Ki Joong Kim
- Department of Pediatrics, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, Republic of Korea; Pediatric Clinical Neuroscience Center, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, Republic of Korea
| | - Moon-Woo Seong
- Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Republic of Korea; Rare Disease Center, Seoul National University Hospital, Seoul, Republic of Korea
| | - Jin Sook Lee
- Department of Pediatrics, Department of Genome Medicine and Science, Gil Medical Center, Gachon University College of Medicine, Incheon, Republic of Korea.
| | - Jong-Hee Chae
- Department of Pediatrics, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, Republic of Korea; Rare Disease Center, Seoul National University Hospital, Seoul, Republic of Korea; Pediatric Clinical Neuroscience Center, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, Republic of Korea.
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17
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Blackburn PR, Schultz MJ, Lahner CA, Li D, Bhoj E, Fisher LJ, Renaud DL, Kenney A, Ibrahim N, Hashem M, Zain Seidahmed M, Hasadsri L, Schrier Vergano SA, Alkuraya FS, Lanpher BC. Expanding the clinical and phenotypic heterogeneity associated with biallelic variants in ACO2. Ann Clin Transl Neurol 2020; 7:1013-1028. [PMID: 32519519 PMCID: PMC7318087 DOI: 10.1002/acn3.51074] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 05/08/2020] [Accepted: 05/10/2020] [Indexed: 11/06/2022] Open
Abstract
OBJECTIVE We describe the clinical characteristics and genetic etiology of several new cases within the ACO2-related disease spectrum. Mitochondrial aconitase (ACO2) is a nuclear-encoded tricarboxylic acid cycle enzyme. Homozygous pathogenic missense variants in the ACO2 gene were initially associated with infantile degeneration of the cerebrum, cerebellum, and retina, resulting in profound intellectual and developmental disability and early death. Subsequent studies have identified a range of homozygous and compound heterozygous pathogenic missense, nonsense, frameshift, and splice-site ACO2 variants in patients with a spectrum of clinical manifestations and disease severities. METHODS We describe a cohort of five novel patients with biallelic pathogenic variants in ACO2. We review the clinical histories of these patients as well as the molecular and functional characterization of the associated ACO2 variants and compare with those described previously in the literature. RESULTS Two siblings with relatively mild symptoms presented with episodic ataxia, mild developmental delays, severe dysarthria, and behavioral abnormalities including hyperactivity and depressive symptoms with generalized anxiety. One patient presented with the classic form with cerebellar hypoplasia, ataxia, seizures, optic atrophy, and retinitis pigmentosa. Another unrelated patient presented with ataxia but developed severe progressive spastic quadriplegia. Another patient demonstrated a spinal muscular atrophy-like presentation with severe neonatal hypotonia, diminished reflexes, and poor respiratory drive, leading to ventilator dependence until death at the age of 9 months. INTERPRETATION In this study, we highlight the importance of recognizing milder forms of the disorder, which may escape detection due to atypical disease presentation.
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Affiliation(s)
- Patrick R Blackburn
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Matthew J Schultz
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Carrie A Lahner
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Dong Li
- Center for Applied Genomics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Elizabeth Bhoj
- Center for Applied Genomics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Laura J Fisher
- Department of Clinical Genomics, Mayo Clinic, Rochester, Minnesota
| | - Deborah L Renaud
- Departments of Neurology and Pediatrics, Mayo Clinic, Rochester, Minnesota
| | - Amy Kenney
- Division of Medical Genetics and Metabolism, Children's Hospital of The King's Daughters, Norfolk, Virginia
| | - Niema Ibrahim
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Mais Hashem
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Mohammed Zain Seidahmed
- Division of Neonatology, Department of Pediatrics, Security Forces Hospital, Riyadh, Saudi Arabia
| | - Linda Hasadsri
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Samantha A Schrier Vergano
- Division of Medical Genetics and Metabolism, Children's Hospital of The King's Daughters, Norfolk, Virginia.,Department of Pediatrics, Eastern Virginia Medical School, Norfolk, Virginia
| | - Fowzan S Alkuraya
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.,Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
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18
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Gibson S, Azamian MS, Lalani SR, Yen KG, Sutton VR, Scott DA. Recessive ACO2 variants as a cause of isolated ophthalmologic phenotypes. Am J Med Genet A 2020; 182:1960-1966. [PMID: 32449285 DOI: 10.1002/ajmg.a.61634] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 04/15/2020] [Accepted: 05/04/2020] [Indexed: 12/20/2022]
Abstract
The mitochondrial aconitase gene (ACO2) encodes an enzyme that catalyzes the conversion of citrate to isocitrate in the tricarboxylic acid cycle. Biallelic variants in ACO2 are purported to cause two distinct disorders: infantile cerebellar-retinal degeneration (ICRD) which is characterized by CNS abnormalities, neurodevelopmental phenotypes, optic atrophy and retinal degeneration; and optic atrophy 9 (OPA9), characterized by isolated ophthalmologic phenotypes including optic atrophy and low vision. However, some doubt remains as to whether biallelic ACO2 variants can cause isolated ophthalmologic phenotypes. A review of the literature revealed five individuals from three families who carry biallelic ACO2 variants whose phenotypes are consistent with OPA9. Here, we describe a brother and sister with OPA9 who are compound heterozygous for novel missense variants in ACO2; c.[487G>T];[1894G>A], p.[(Val163Leu)];[(Val632Met)]. A review of pathogenic ACO2 variants revealed that those associated with OPA9 are distinct from those associated with ICRD. Missense variants associated with either OPA9 or ICRD do not cluster in distinct ACO2 domains, making it difficult to predict the severity of a variant based on position alone. We conclude that biallelic variants in ACO2 can cause the milder OPA9 phenotype, and that the OPA9-related ACO2 variants identified to date are distinct from those that cause ICRD.
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Affiliation(s)
- Shelley Gibson
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA
| | - Mahshid S Azamian
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA
- Texas Children's Hospital, Houston, Texas, USA
| | - Seema R Lalani
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA
- Texas Children's Hospital, Houston, Texas, USA
| | - Kimberly G Yen
- Texas Children's Hospital, Houston, Texas, USA
- Department of Ophthalmology, Baylor College of Medicine, Houston, Texas, USA
| | - V Reid Sutton
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA
- Texas Children's Hospital, Houston, Texas, USA
| | - Daryl A Scott
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA
- Texas Children's Hospital, Houston, Texas, USA
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, Texas, USA
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19
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Chen Y, Cai GH, Xia B, Wang X, Zhang CC, Xie BC, Shi XC, Liu H, Lu JF, Zhang RX, Zhu MQ, Liu M, Yang SZ, Yang Zhang D, Chu XY, Khan R, Wang YL, Wu JW. Mitochondrial aconitase controls adipogenesis through mediation of cellular ATP production. FASEB J 2020; 34:6688-6702. [PMID: 32212192 DOI: 10.1096/fj.201903224rr] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 03/10/2020] [Accepted: 03/11/2020] [Indexed: 11/11/2022]
Abstract
Mitochondrial aconitase (Aco2) catalyzes the conversion of citrate to isocitrate in the TCA cycle, which produces NADH and FADH2, driving synthesis of ATP through OXPHOS. In this study, to explore the relationship between adipogenesis and mitochondrial energy metabolism, we hypothesize that Aco2 may play a key role in the lipid synthesis. Here, we show that overexpression of Aco2 in 3T3-L1 cells significantly increased lipogenesis and adipogenesis, accompanied by elevated mitochondrial biogenesis and ATP production. However, when ATP is depleted by rotenone, an inhibitor of the respiratory chain, the promotive role of Aco2 in adipogenesis is abolished. In contrast to Aco2 overexpression, deficiency of Aco2 markedly reduced lipogenesis and adipogenesis, along with the decreased mitochondrial biogenesis and ATP production. Supplementation of isocitrate efficiently rescued the inhibitory effect of Aco2 deficiency. Similarly, the restorative effect of isocitrate was abolished in the presence of rotenone. Together, these results show that Aco2 sustains normal adipogenesis through mediating ATP production, revealing a potential mechanistic link between TCA cycle enzyme and lipid synthesis. Our work suggest that regulation of adipose tissue mitochondria function may be a potential way for combating abnormal adipogenesis related diseases such as obesity and lipodystrophy.
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Affiliation(s)
- Yan Chen
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Guo He Cai
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Bo Xia
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Xin Wang
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Cong Cong Zhang
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Bao Cai Xie
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Xiao Chen Shi
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Huan Liu
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Jun Feng Lu
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Rui Xin Zhang
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Meng Qing Zhu
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Min Liu
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Shi Zhen Yang
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Dan Yang Zhang
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Xin Yi Chu
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Rajwali Khan
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Yong Liang Wang
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Jiang Wei Wu
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
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20
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Cascón A, Remacha L, Calsina B, Robledo M. Pheochromocytomas and Paragangliomas: Bypassing Cellular Respiration. Cancers (Basel) 2019; 11:E683. [PMID: 31100940 PMCID: PMC6562521 DOI: 10.3390/cancers11050683] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 05/08/2019] [Accepted: 05/13/2019] [Indexed: 12/14/2022] Open
Abstract
Abstract: Pheochromocytomas and paragangliomas (PPGL) are rare neuroendocrine tumors that show the highest heritability of all human neoplasms and represent a paradoxical example of genetic heterogeneity. Amongst the elevated number of genes involved in the hereditary predisposition to the disease (at least nineteen) there are eleven tricarboxylic acid (TCA) cycle-related genes, some of which are also involved in the development of congenital recessive neurological disorders and other cancers such as cutaneous and uterine leiomyomas, gastrointestinal tumors and renal cancer. Somatic or germline mutation of genes encoding enzymes catalyzing pivotal steps of the TCA cycle not only disrupts cellular respiration, but also causes severe alterations in mitochondrial metabolite pools. These latter alterations lead to aberrant accumulation of "oncometabolites" that, in the end, may lead to deregulation of the metabolic adaptation of cells to hypoxia, inhibition of the DNA repair processes and overall pathological changes in gene expression. In this review, we will address the TCA cycle mutations leading to the development of PPGL, and we will discuss the relevance of these mutations for the transformation of neural crest-derived cells and potential therapeutic approaches based on the emerging knowledge of underlying molecular alterations.
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Affiliation(s)
- Alberto Cascón
- Hereditary Endocrine Cancer Group, Spanish National Cancer Research Centre (CNIO), 28029 Madrid, Spain.
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), 28029 Madrid, Spain.
| | - Laura Remacha
- Hereditary Endocrine Cancer Group, Spanish National Cancer Research Centre (CNIO), 28029 Madrid, Spain.
| | - Bruna Calsina
- Hereditary Endocrine Cancer Group, Spanish National Cancer Research Centre (CNIO), 28029 Madrid, Spain.
| | - Mercedes Robledo
- Hereditary Endocrine Cancer Group, Spanish National Cancer Research Centre (CNIO), 28029 Madrid, Spain.
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), 28029 Madrid, Spain.
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21
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Sharkia R, Wierenga KJ, Kessel A, Azem A, Bertini E, Carrozzo R, Torraco A, Goffrini P, Ceccatelli Berti C, McCormick ME, Plecko B, Klein A, Abela L, Hengel H, Schöls L, Shalev S, Khayat M, Mahajnah M, Spiegel R. Clinical, radiological, and genetic characteristics of 16 patients with ACO2 gene defects: Delineation of an emerging neurometabolic syndrome. J Inherit Metab Dis 2019; 42:264-275. [PMID: 30689204 DOI: 10.1002/jimd.12022] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 12/07/2018] [Indexed: 12/26/2022]
Abstract
Mitochondrial aconitase is the second enzyme in the tricarboxylic acid (TCA) cycle catalyzing the interconversion of citrate into isocitrate and encoded by the nuclear gene ACO2. A homozygous pathogenic variant in the ACO2 gene was initially described in 2012 resulting in a novel disorder termed "infantile cerebellar retinal degeneration" (ICRD, OMIM#614559). Subsequently, additional studies reported patients with pathogenic ACO2 variants, further expanding the genetic and clinical spectrum of this disorder to include milder and later onset manifestations. Here, we report an international multicenter cohort of 16 patients (of whom 7 are newly diagnosed) with biallelic pathogenic variants in ACO2 gene. Most patients present in early infancy with severe truncal hypotonia, truncal ataxia, variable seizures, evolving microcephaly, and ophthalmological abnormalities of which the most dominant are esotropia and optic atrophy with later development of retinal dystrophy. Most patients remain nonambulatory and do no acquire any language, but a subgroup of patients share a more favorable course. Brain magnetic resonance imaging (MRI) is typically normal within the first months but global atrophy gradually develops affecting predominantly the cerebellum. Ten of our patients were homozygous to the previously reported c.336C>G founder mutation while the other six patients were all compound heterozygotes displaying 10 novel mutations of whom 2 were nonsense predicting a deleterious effect on enzyme function. Structural protein modeling predicted significant impairment in aconitase substrate binding in the additional missense mutations. This study provides the most extensive cohort of patients and further delineates the clinical, radiological, biochemical, and molecular features of ACO2 deficiency.
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Affiliation(s)
- Rajech Sharkia
- Unit of Human Biology and Genetics, The Triangle Regional Research and Development Center, Kafr Qari, Israel
- Unit of Nature Science, Beit-Berl Academic College, Beit-Berl, Israel
| | - Klaas J Wierenga
- Department of Pediatrics, Oklahoma University Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Amit Kessel
- Department of Biochemistry and Molecular Biology, Faculty of Life Sciences, Tel-Aviv University, Tel-Aviv, Israel
| | - Abdussalam Azem
- Department of Biochemistry and Molecular Biology, Faculty of Life Sciences, Tel-Aviv University, Tel-Aviv, Israel
| | - Enrico Bertini
- Unit of Muscular and Neurodegenerative Disorders, Laboratory of Molecular Medicine, Bambino Gesu' Children's Research Hospital, Rome, Italy
| | - Rosalba Carrozzo
- Unit of Muscular and Neurodegenerative Disorders, Laboratory of Molecular Medicine, Bambino Gesu' Children's Research Hospital, Rome, Italy
| | - Alessandra Torraco
- Unit of Muscular and Neurodegenerative Disorders, Laboratory of Molecular Medicine, Bambino Gesu' Children's Research Hospital, Rome, Italy
| | - Paola Goffrini
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy
| | - Camilla Ceccatelli Berti
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy
| | - M Eileen McCormick
- Department of Pediatrics, Oakland University William Beaumont School of Medicine, Rochester, Michigan
| | - Barbara Plecko
- Division of Child Neurology, University Children's Hospital Zurich, Zurich, Switzerland
- Department of Pediatrics, Medical University of Graz, Graz, Austria
| | - Andrea Klein
- Department of Pediatric Neurology, University Children's Hospital Basel and University Children's Hospital, Bern, Switzerland
| | - Lucia Abela
- Molecular Neurosciences, Developmental Neuroscience, UCL Institute of Child Health, London, UK
| | - Holger Hengel
- German Research Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
- Department of Neurodegenerative Diseases and Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Ludger Schöls
- German Research Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
- Department of Neurodegenerative Diseases and Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Stavit Shalev
- Rappaport Faculty of Medicine, Technion- Israel Institute of Technology, Haifa, Israel
- Institute of Medical Genetics, Emek Medical Center, Afula, Israel
| | - Morad Khayat
- Institute of Medical Genetics, Emek Medical Center, Afula, Israel
| | - Muhammad Mahajnah
- Rappaport Faculty of Medicine, Technion- Israel Institute of Technology, Haifa, Israel
- Child Neurology and Development Center, Hillel-Yaffe Medical Center, Hadera, Israel
| | - Ronen Spiegel
- Rappaport Faculty of Medicine, Technion- Israel Institute of Technology, Haifa, Israel
- Department of Pediatrics B, Emek Medical Center, Afula, Israel
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22
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Boutry M, Morais S, Stevanin G. Update on the Genetics of Spastic Paraplegias. Curr Neurol Neurosci Rep 2019; 19:18. [DOI: 10.1007/s11910-019-0930-2] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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23
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Finsterer J, Zarrouk‐Mahjoub S. Mitochondrial ataxia is genetically and phenotypically heterogeneous. CNS Neurosci Ther 2018; 24:1301-1302. [PMID: 29998495 PMCID: PMC6490036 DOI: 10.1111/cns.13031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Affiliation(s)
| | - Sinda Zarrouk‐Mahjoub
- Pasteur Institute of TunisUniversity of Tunis El Manar and Genomics PlatformTunisTunisia
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