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Ghosh Dastidar R, Banerjee S, Lal PB, Ghosh Dastidar S. Multifaceted Roles of AFG3L2, a Mitochondrial ATPase in Relation to Neurological Disorders. Mol Neurobiol 2024; 61:3788-3808. [PMID: 38012514 PMCID: PMC11236935 DOI: 10.1007/s12035-023-03768-z] [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: 09/09/2023] [Accepted: 11/01/2023] [Indexed: 11/29/2023]
Abstract
AFG3L2 is a zinc metalloprotease and an ATPase localized in an inner mitochondrial membrane involved in mitochondrial quality control of several nuclear- and mitochondrial-encoded proteins. Mutations in AFG3L2 lead to diseases like slow progressive ataxia, which is a neurological disorder. This review delineates the cellular functions of AFG3L2 and its dysfunction that leads to major clinical outcomes, which include spinocerebellar ataxia type 28, spastic ataxia type 5, and optic atrophy type 12. It summarizes all relevant AFG3L2 mutations associated with the clinical outcomes to understand the detailed mechanisms attributable to its structure-related multifaceted roles in proteostasis and quality control. We face early diagnostic challenges of ataxia and optic neuropathy due to asymptomatic parents and variable clinical manifestations due to heterozygosity/homozygosity of AFG3L2 mutations. This review intends to promote AFG3L2 as a putative prognostic or diagnostic marker.
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Affiliation(s)
- Ranita Ghosh Dastidar
- Department of Biochemistry, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, Madhava Nagar, Manipal, 576104, Karnataka, India.
| | - Saradindu Banerjee
- Centre for Molecular Neurosciences, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, Madhava Nagar, Manipal, 576104, Karnataka, India
| | - Piyush Behari Lal
- Department of Microbiology, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, Madhava Nagar, Manipal, 576104, Karnataka, India.
| | - Somasish Ghosh Dastidar
- Centre for Molecular Neurosciences, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, Madhava Nagar, Manipal, 576104, Karnataka, India.
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Bolmasova AV, Melikyan MA, Gadzhieva ZS, Puchkova AA, Degtyareva AV, Peterkova VA. [Congenital hypopituitarism with monosomy of chromosome 18]. ACTA ACUST UNITED AC 2021; 67:57-67. [PMID: 34533014 DOI: 10.14341/probl12761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 07/13/2021] [Accepted: 07/13/2021] [Indexed: 11/06/2022]
Abstract
Congenital hypopituitarism is a rare disease. It can be caused by isolated inborn defects of the pituitary, gene mutations (PROP1, PIT1), and chromosomal abnormalities.Deletions of chromosome 18 (De Grouchy syndrome types 1 and 2) are a group of rare genetic diseases with a frequency of 1:50,000. Hypopituitarism in these syndromes is detected in from 13 to 56% of cases and depends on the size and location of the deleted segment.We have described a series of clinical cases of patients with congenital hypopituitarism due to deletions in chromosome 18. All children had a characteristic dysmorphic features and delayed mental and speech development. Within first months of life, patients developed muscular hypotension, dysphagia, and respiratory disorders. The patients had various congenital malformations in combination with hypopituitarism (isolated growth hormone deficiency and multiple pituitaryhormone deficiencies). In the neonatal period, there were the presence of hypoglycemia in combination with cholestasis.Hormone replacement therapy led to rapid relief of symptoms.Сhromosomal microarray analysis in 2 patients allowed us to identify exact location of deleted area and deleted genes and optimize further management for them.
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Affiliation(s)
- A V Bolmasova
- Endocrinology research center; Kulakov Federal Reseаrch Center for Obstetrics, Gynecology and Perinatology
| | | | | | - A A Puchkova
- Kulakov Federal Reseаrch Center for Obstetrics, Gynecology and Perinatology
| | - A V Degtyareva
- Kulakov Federal Reseаrch Center for Obstetrics, Gynecology and Perinatology; The First Sechenov Moscow State Medical University
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Le TNU, Nguyen VN, Doan TDA, Doan HNB, Le PTQ, Le TL, Ha TMT. An experience in prenatal diagnosis via QF-PCR of a female child with a 9.9 Mb pure deletion at 18p11.32-11.22. NAGOYA JOURNAL OF MEDICAL SCIENCE 2020; 82:783-790. [PMID: 33311808 PMCID: PMC7719451 DOI: 10.18999/nagjms.82.4.783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 03/19/2020] [Indexed: 11/30/2022]
Abstract
Quantitative Fluorescent - Polymerase Chain Reaction (QF-PCR) is a rapid prenatal diagnosis test for 21, 18, 13 and sex chromosomal aneuploidy detection. However, it could not detect partial trisomy or partial monosomy of those chromosomes. Here, we report a 19-month-old Vietnamese female with a 9.9 Mb pure deletion of chromosome 18 at 18p11.32-11.22 confirmed by next generation sequencing. The patient was short statured with facial dysmorphic features as well as motor skill and speech delays. First trimester screening showed high risk of trisomy 21 with only increased nuchal translucency (NT 3.9 mm) by ultrasound as an indication. Prenatal diagnosis by QF-PCR from amniotic DNA revealed normal disomy. Noticeably, two short tandem repeat (STR) markers D18S391 and D18S976 located on 18p exhibited uninformative patterns (one peak). Thus, our case suggested that the combination of both D18S391 and D18S976 markers with uninformative patterns in QF-PCR for prenatal diagnosis and increased NT in the first trimester ultrasound may be a significant indication of 18p monosomy.
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Affiliation(s)
- Thanh Nha Uyen Le
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Viet Nhan Nguyen
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Thi Duyen Anh Doan
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Huu Nhat Binh Doan
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Phan Tuong Quynh Le
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Tuan Linh Le
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Thi Minh Thi Ha
- Department of Medical Genetics, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
- Center of Prenatal and Neonatal Screening-Diagnosis, Hospital of Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam
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Cody JD. The Consequences of Abnormal Gene Dosage: Lessons from Chromosome 18. Trends Genet 2020; 36:764-776. [PMID: 32660784 DOI: 10.1016/j.tig.2020.06.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 06/17/2020] [Accepted: 06/18/2020] [Indexed: 12/18/2022]
Abstract
Accurate interpretation of genomic copy number variation (CNV) remains a challenge and has important consequences for both congenital and late-onset disease. Hemizygosity dosage characterization of the genes on chromosome 18 reveals a spectrum of outcomes ranging from no clinical effect, to risk factors for disease, to both low- and high-penetrance disease. These data are important for accurate and predictive clinical management. Additionally, the potential mechanisms of reduced penetrance due to dosage compensation are discussed as a key to understanding avenues for potential treatment. This review describes the chromosome 18 findings, and discusses the molecular mechanisms that allow haploinsufficiency, reduced penetrance, and dosage compensation.
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Affiliation(s)
- Jannine DeMars Cody
- Department of Pediatrics, University of Texas Health San Antonio, San Antonio, TX 78229, USA; Chromosome 18 Registry and Research Society, San Antonio, TX 78229, USA.
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Mello CB, Bueno OFA, Benedetto LM, Pimenta LSE, Takeno SS, Melaragno MI, Meloni VA. Intellectual, adaptive and behavioural characteristics in four patients with 18p deletion syndrome. JOURNAL OF INTELLECTUAL DISABILITY RESEARCH : JIDR 2019; 63:225-232. [PMID: 30536814 DOI: 10.1111/jir.12568] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 10/05/2018] [Accepted: 10/15/2018] [Indexed: 06/09/2023]
Abstract
BACKGROUND The association of behavioural phenotype assessment with cytogenomic characterisation may provide a better comprehension of genotype-phenotype correlations in syndromes caused by chromosomal abnormalities, such as 18p deletion syndrome. METHOD We report on four Brazilian patients with 18p deletion syndrome characterised by cytogenomic techniques and detailed neuropsychological evaluation. Intellectual, adaptive and behavioural characteristics were assessed through the Wechsler's Scales, the Vineland-II Scale and the Child Behaviour Checklist, respectively. Socio-economic measures including main caretaker educational level and family income as defined by Brazilian criteria for social class classification were also collected to evaluate a possible contribution of environmental factors in neurocognitive variability. RESULTS Two out of four patients showed intellectual disability (IQ < 70). Wechsler's scale results suggest that in our sample, interpretation of social situations based on observation of non-verbal behaviour constitute a cognitive strength while judgement of social rules and language skills associated with word knowledge and verbal fluency may be a cognitive weakness. Concerning adaptive behaviour, motor and socialisation domains showed to better develop than communication and daily living skills on the Vineland-II Scale. Only one patient presented internalising behavioural problems based on the Child Behaviour Checklist. Our results also suggested that socio-economic status may contribute to overall patient development. CONCLUSION Our results suggest that some 18p deletion syndrome patients may present average intellectual performance and that the segment deletion size and some families' socio-economic conditions may influence cognitive development.
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Affiliation(s)
- C B Mello
- Psychobiology Department, Universidade Federal de São Paulo, São Paulo, Brazil
| | - O F A Bueno
- Psychobiology Department, Universidade Federal de São Paulo, São Paulo, Brazil
| | - L M Benedetto
- Psychobiology Department, Universidade Federal de São Paulo, São Paulo, Brazil
| | - L S E Pimenta
- Psychobiology Department, Universidade Federal de São Paulo, São Paulo, Brazil
| | - S S Takeno
- Genetics Division, Department of Morphology and Genetics, Universidade Federal de São Paulo, São Paulo, Brazil
| | - M I Melaragno
- Genetics Division, Department of Morphology and Genetics, Universidade Federal de São Paulo, São Paulo, Brazil
| | - V A Meloni
- Genetics Division, Department of Morphology and Genetics, Universidade Federal de São Paulo, São Paulo, Brazil
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Levytskyy RM, Germany EM, Khalimonchuk O. Mitochondrial Quality Control Proteases in Neuronal Welfare. J Neuroimmune Pharmacol 2016; 11:629-644. [PMID: 27137937 PMCID: PMC5093085 DOI: 10.1007/s11481-016-9683-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 04/27/2016] [Indexed: 01/01/2023]
Abstract
The functional integrity of mitochondria is a critical determinant of neuronal health and compromised mitochondrial function is a commonly recognized factor that underlies a plethora of neurological and neurodegenerative diseases. Metabolic demands of neural cells require high bioenergetic outputs that are often associated with enhanced production of reactive oxygen species. Unopposed accumulation of these respiratory byproducts over time leads to oxidative damage and imbalanced protein homeostasis within mitochondrial subcompartments, which in turn may result in cellular demise. The post-mitotic nature of neurons and their vulnerability to these stress factors necessitate strict protein homeostatic control to prevent such scenarios. A series of evolutionarily conserved proteases is one of the central elements of mitochondrial quality control. These versatile proteolytic enzymes conduct a multitude of activities to preserve normal mitochondrial function during organelle biogenesis, metabolic remodeling and stress. In this review we discuss neuroprotective aspects of mitochondrial quality control proteases and neuropathological manifestations arising from defective proteolysis within the mitochondrion.
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Affiliation(s)
- Roman M Levytskyy
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Edward M Germany
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Oleh Khalimonchuk
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA.
- Nebraska Redox Biology Center, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA.
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Charif M, Roubertie A, Salime S, Mamouni S, Goizet C, Hamel CP, Lenaers G. A novel mutation of AFG3L2 might cause dominant optic atrophy in patients with mild intellectual disability. Front Genet 2015; 6:311. [PMID: 26539208 PMCID: PMC4609881 DOI: 10.3389/fgene.2015.00311] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 09/28/2015] [Indexed: 11/23/2022] Open
Abstract
Dominant optic neuropathies causing fiber loss in the optic nerve are among the most frequent inherited mitochondrial diseases. In most genetically resolved cases, the disease is associated to a mutation in OPA1, which encodes an inner mitochondrial dynamin involved in network fusion, cristae structure and mitochondrial genome maintenance. OPA1 cleavage is regulated by two m-AAA proteases, SPG7 and AFG3L2, which are, respectively involved in Spastic Paraplegia 7 and Spino-Cerebellar Ataxia 28. Here, we identified a novel mutation c.1402C>T in AFG3L2, modifying the arginine 468 in cysteine in an evolutionary highly conserved arginine-finger motif, in a family with optic atrophy and mild intellectual disability. Ophthalmic examinations disclosed a loss of retinal nerve fibers on the temporal and nasal sides of the optic disk and a red–green dyschromatopsia. Thus, our results suggest that neuro-ophthalmological symptom as optic atrophy might be associated with AFG3L2 mutations, and should prompt the screening of this gene in patients with isolated and syndromic inherited optic neuropathies.
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Affiliation(s)
- Majida Charif
- Institut des Neurosciences de Montpellier, U1051 de l'INSERM, Université de Montpellier Montpellier, France ; PREMMi, CNRS UMR 6214 - INSERM U1083, Département de Biochimie et Génétique, Université d'Angers, CHU d'Angers Angers, France
| | - Agathe Roubertie
- Institut des Neurosciences de Montpellier, U1051 de l'INSERM, Université de Montpellier Montpellier, France ; CHRU Montpellier, Service de Neuro-pédiatrie, Hôpital Gui de Chauliac Montpellier, France
| | - Sara Salime
- Institut des Neurosciences de Montpellier, U1051 de l'INSERM, Université de Montpellier Montpellier, France
| | - Sonia Mamouni
- CHRU Montpellier, Centre de Référence pour les Maladies Sensorielles Génétiques, Hôpital Gui de Chauliac Montpellier, France
| | - Cyril Goizet
- CHU Bordeaux, Service de Génétique Médicale and Université de Bordeaux, Laboratoire Maladies Rares, Génétique et Métabolisme (MRGM) Bordeaux, France
| | - Christian P Hamel
- Institut des Neurosciences de Montpellier, U1051 de l'INSERM, Université de Montpellier Montpellier, France ; CHRU Montpellier, Centre de Référence pour les Maladies Sensorielles Génétiques, Hôpital Gui de Chauliac Montpellier, France
| | - Guy Lenaers
- Institut des Neurosciences de Montpellier, U1051 de l'INSERM, Université de Montpellier Montpellier, France ; PREMMi, CNRS UMR 6214 - INSERM U1083, Département de Biochimie et Génétique, Université d'Angers, CHU d'Angers Angers, France
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Qu J, Wu CK, Zuzuárregui JRP, Hohler AD. A novel AFG3L2 mutation in a Somalian patient with spinocerebellar ataxia type 28. J Neurol Sci 2015; 358:530-1. [PMID: 26454370 DOI: 10.1016/j.jns.2015.10.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 09/17/2015] [Accepted: 10/01/2015] [Indexed: 11/17/2022]
Affiliation(s)
- Jane Qu
- Boston University School of Medicine, 72 E. Concord Street, Boston, MA 02118, United States.
| | - Connie K Wu
- Boston University School of Medicine, 72 E. Concord Street, Boston, MA 02118, United States.
| | - José Rafael P Zuzuárregui
- Boston University School of Medicine, Department of Neurology, 72 E. Concord St, C3, Boston, MA 02118, United States.
| | - Anna D Hohler
- Boston University School of Medicine, Department of Neurology, 72 E. Concord St, C3, Boston, MA 02118, United States.
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Hasi-Zogaj M, Sebold C, Heard P, Carter E, Soileau B, Hill A, Rupert D, Perry B, Atkinson S, O'Donnell L, Gelfond J, Lancaster J, Fox PT, Hale DE, Cody JD. A review of 18p deletions. AMERICAN JOURNAL OF MEDICAL GENETICS PART C-SEMINARS IN MEDICAL GENETICS 2015; 169:251-64. [PMID: 26250845 DOI: 10.1002/ajmg.c.31445] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Since 18p- was first described in 1963, much progress has been made in our understanding of this classic deletion condition. We have been able to establish a fairly complete picture of the phenotype when the deletion breakpoint occurs at the centromere, and we are working to establish the phenotypic effects when each gene on 18p is hemizygous. Our aim is to provide genotype-specific anticipatory guidance and recommendations to families with an 18p- diagnosis. In addition, establishing the molecular underpinnings of the condition will potentially suggest targets for molecular treatments. Thus, the next step is to establish the precise effects of specific gene deletions. As we look forward to deepening our understanding of 18p-, our focus will continue to be on the establishment of robust genotype-phenotype correlations and the penetrance of these phenotypes. We will continue to follow our 18p- cohort closely as they age to determine the presence or absence of some of these diagnoses, including spinocerebellar ataxia (SCA), facioscapulohumeral muscular dystrophy (FSHD), and dystonia. We will also continue to refine the critical regions for other phenotypes as we enroll additional (hopefully informative) participants into the research study and as the mechanisms of the genes in these regions are elucidated. Mouse models will also be developed to further our understanding of the effects of hemizygosity as well as to serve as models for treatment development.
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