1
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Engin Erdal A, Yürek B, Kıreker Köylü O, Ceylan AC, Çıtak Kurt AN, Kasapkara ÇS. Hereditary spastic paraplegia type 35 in a Turkish girl with fatty acid hydroxylase-associated neurodegeneration. J Pediatr Endocrinol Metab 2024; 37:271-275. [PMID: 38353247 DOI: 10.1515/jpem-2023-0481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Accepted: 01/18/2024] [Indexed: 03/07/2024]
Abstract
OBJECTIVES The fatty acid 2-hydroxylase gene (FA2H) compound heterozygous or homozygous variants that cause spastic paraplegia type 35 (SPG35) (OMIM # 612319) are autosomal recessive HSPs. FA2H gene variants in humans have been shown to be associated with not only SPG35 but also leukodystrophy and neurodegeneration with brain iron accumulation. CASE PRESENTATION A patient with a spastic gait since age seven was admitted to the paediatric metabolism department. She was born to consanguineous, healthy Turkish parents and had no family history of neurological disease. She had normal developmental milestones and was able to walk at 11 months. At age seven, she developed a progressive gait disorder with increased muscle tone in her lower limbs, bilateral ankle clonus and dysdiadochokinesis. She had frequent falls and deteriorating school performance. Despite physiotherapy, her spastic paraplegia was progressive. Whole exome sequencing (WES) identified a homozygous NM_024306.5:c.460C>T missense variant in the FA2H gene, of which her parents were heterozygous carriers. A brain MRI showed a slight reduction in the cerebellar volume with no iron deposits. CONCLUSIONS Pathogenic variants of the FA2H gene have been linked to neurodegeneration with iron accumulation in the brain, leukodystrophy and SPG35. When patients developed progressive gait deterioration since early childhood even if not exhibited hypointensity in the basal ganglia detected by neuroimaging, FA2H-related neurodegeneration with brain iron accumulation should be ruled out. FA2H/SPG35 disease is characterised by notable clinical and imaging variability, as well as phenotypic diversity.
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Affiliation(s)
- Ayşenur Engin Erdal
- Department of Pediatric Metabolic Diseases, Children's Hospital, Ankara Bilkent City Hospital, Ankara, Türkiye
| | - Burak Yürek
- Department of Pediatric Metabolic Diseases, Children's Hospital, Ankara Bilkent City Hospital, Ankara, Türkiye
| | - Oya Kıreker Köylü
- Department of Pediatric Metabolic Diseases, Children's Hospital, Ankara Bilkent City Hospital, Ankara, Türkiye
| | - Ahmet Cevdet Ceylan
- Department of Medical Genetics, Ankara Bilkent City Hospital, Ankara, Türkiye
| | - Ayşegül Neşe Çıtak Kurt
- Department of Pediatric Neurology, Children's Hospital, Ankara Bilkent City Hospital, Ankara, Türkiye
| | - Çiğdem Seher Kasapkara
- Department of Pediatric Metabolic Diseases, Children's Hospital, Ankara Bilkent City Hospital, Ankara, Türkiye
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2
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Mo L, Tie X, Che F, Zhang L, Li B, Wang G, Yang Y. A Novel Homozygous Deletion Including Exon 1 of FA2H Gene Causes Spastic Paraplegia-35: Genetic and Lipidomics Analysis of the Patients. Pediatr Neurol 2024; 152:200-208. [PMID: 38306901 DOI: 10.1016/j.pediatrneurol.2023.12.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 12/20/2023] [Accepted: 12/31/2023] [Indexed: 02/04/2024]
Abstract
BACKGROUND Fatty acid 2-hydroxylase (FA2H) is encoded by the FA2H gene, with mutations therein leading to the neurodegenerative condition, spastic paraplegia-35 (SPG35). We aim to elucidate the genetic underpinnings of a nonconsanguineous Chinese family diagnosed with SPG35 by examining the clinical manifestations, scrutinizing genetic variants, and establishing the role of FA2H mutation in lipid metabolism. METHODS Using next-generation sequencing analysis to identify the pathogenic gene in this pedigree and family cosegregation verification. The use of lipidomics of patient pedigree peripheral blood mononuclear cells further substantiated alterations in lipid metabolism attributable to the FA2H exon 1 deletion. RESULTS The proband exhibited gait disturbance from age 5 years; he developed further clinical manifestations such as scissor gait and dystonia. His younger sister also presented with a spastic gait from the same age. We identified a homozygous deletion in the region of FA2H exon 1, spanning from chr16:74807867 to chr16: 74810391 in the patients. Lipidomic analysis revealed significant differences in 102 metabolites compared with healthy controls, with 62 metabolites increased and 40 metabolites decreased. We specifically zeroed in on 19 different sphingolipid metabolites, which comprised ceramides, ganglioside, etc., with only three of these sphingolipids previously reported. CONCLUSIONS This is the first study of lipid metabolism in the blood of patients with SPG35. The results broaden our understanding of the SPG35 gene spectrum, offering insights for future molecular mechanism research and laying groundwork for determining metabolic markers.
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Affiliation(s)
- Lidangzhi Mo
- Shaanxi Institute for Pediatric Diseases, Xi'an Children's Hospital, Xi'an, China
| | - Xiaoling Tie
- Department of Rehabilitation, Xi'an Children's Hospital, Xi'an, China
| | - Fengyu Che
- Shaanxi Institute for Pediatric Diseases, Xi'an Children's Hospital, Xi'an, China
| | - Liyu Zhang
- Shaanxi Institute for Pediatric Diseases, Xi'an Children's Hospital, Xi'an, China
| | - Benchang Li
- Shaanxi Institute for Pediatric Diseases, Xi'an Children's Hospital, Xi'an, China
| | - Guoxia Wang
- Shaanxi Institute for Pediatric Diseases, Xi'an Children's Hospital, Xi'an, China
| | - Ying Yang
- Shaanxi Institute for Pediatric Diseases, Xi'an Children's Hospital, Xi'an, China.
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3
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German A, Jukic J, Laner A, Arnold P, Socher E, Mennecke A, Schmidt MA, Winkler J, Abicht A, Regensburger M. Novel Homozygous FA2H Variant Causing the Full Spectrum of Fatty Acid Hydroxylase-Associated Neurodegeneration (SPG35). Genes (Basel) 2023; 15:14. [PMID: 38275596 PMCID: PMC10815826 DOI: 10.3390/genes15010014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 12/15/2023] [Accepted: 12/16/2023] [Indexed: 01/27/2024] Open
Abstract
Fatty acid hydroxylase-associated neurodegeneration (FAHN/SPG35) is caused by pathogenic variants in FA2H and has been linked to a continuum of specific motor and non-motor neurological symptoms, leading to progressive disability. As an ultra-rare disease, its mutational spectrum has not been fully elucidated. Here, we present the prototypical workup of a novel FA2H variant, including clinical and in silico validation. An 18-year-old male patient presented with a history of childhood-onset progressive cognitive impairment, as well as progressive gait disturbance and lower extremity muscle cramps from the age of 15. Additional symptoms included exotropia, dystonia, and limb ataxia. Trio exome sequencing revealed a novel homozygous c.75C>G (p.Cys25Trp) missense variant in the FA2H gene, which was located in the cytochrome b5 heme-binding domain. Evolutionary conservation, prediction models, and structural protein modeling indicated a pathogenic loss of function. Brain imaging showed characteristic features, thus fulfilling the complete multisystem neurodegenerative phenotype of FAHN/SPG35. In summary, we here present a novel FA2H variant and provide prototypical clinical findings and structural analyses underpinning its pathogenicity.
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Affiliation(s)
- Alexander German
- Department of Molecular Neurology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
| | - Jelena Jukic
- Department of Molecular Neurology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
| | - Andreas Laner
- MGZ—Medizinisch Genetisches Zentrum, 80335 Munich, Germany
| | - Philipp Arnold
- Institute of Functional and Clinical Anatomy, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
| | - Eileen Socher
- Institute of Functional and Clinical Anatomy, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
| | - Angelika Mennecke
- Institute of Neuroradiology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
| | - Manuel A. Schmidt
- Institute of Neuroradiology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
| | - Jürgen Winkler
- Department of Molecular Neurology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
- Center for Rare Diseases (ZSEER), University Hospital Erlangen, 91054 Erlangen, Germany
| | - Angela Abicht
- MGZ—Medizinisch Genetisches Zentrum, 80335 Munich, Germany
| | - Martin Regensburger
- Department of Molecular Neurology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
- Center for Rare Diseases (ZSEER), University Hospital Erlangen, 91054 Erlangen, Germany
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4
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Khan A, Tian S, Tariq M, Khan S, Safeer M, Ullah N, Akbar N, Javed I, Asif M, Ahmad I, Ullah S, Satti HS, Khan R, Naeem M, Ali M, Rendu J, Fauré J, Dieterich K, Latypova X, Baig SM, Malik NA, Zhang F, Khan TN, Liu C. NGS-driven molecular diagnosis of heterogeneous hereditary neurological disorders reveals novel and known variants in disease-causing genes. Mol Genet Genomics 2022; 297:1601-1613. [PMID: 36002593 DOI: 10.1007/s00438-022-01945-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 08/11/2022] [Indexed: 11/28/2022]
Abstract
Hereditary neurological disorders (HNDs) are a clinically and genetically heterogeneous group of disorders. These disorders arise from the impaired function of the central or peripheral nervous system due to aberrant electrical impulses. More than 600 various neurological disorders, exhibiting a wide spectrum of overlapping clinical presentations depending on the organ(s) involved, have been documented. Owing to this clinical heterogeneity, diagnosing these disorders has been a challenge for both clinicians and geneticists and a large number of patients are either misdiagnosed or remain entirely undiagnosed. Contribution of genetics to neurological disorders has been recognized since long; however, the complete picture of the underlying molecular bases are under-explored. The aim of this study was to accurately diagnose 11 unrelated Pakistani families with various HNDs deploying NGS as a first step approach. Using exome sequencing and gene panel sequencing, we successfully identified disease-causing genomic variants these families. We report four novel variants, one each in, ECEL1, NALCN, TBR1 and PIGP in four of the pedigrees. In the rest of the seven families, we found five previously reported pathogenic variants in POGZ, FA2H, PLA2G6 and CYP27A1. Of these, three families segregate a homozygous 18 bp in-frame deletion of FA2H, indicating a likely founder mutation segregating in Pakistani population. Genotyping for this mutation can help low-cost population wide screening in the corresponding regions of the country. Our findings not only expand the existing repertoire of mutational spectrum underlying neurological disorders but will also help in genetic testing of individuals with HNDs in other populations.
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Affiliation(s)
- Ayaz Khan
- National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Shixiong Tian
- Shanghai Key Laboratory of Metabolic Remodeling and Health, Institute of Metabolism and Integrative Biology, Human Phenome Institute, Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai, 200438, China
| | - Muhammad Tariq
- National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Sheraz Khan
- National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Muhammad Safeer
- Department of Biotechnology and Genetic Engineering, Hazara University, Mansehra, Pakistan
| | - Naimat Ullah
- National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Nazia Akbar
- Department of Biotechnology and Genetic Engineering, Hazara University, Mansehra, Pakistan
| | - Iram Javed
- Department of Paediatric Neurology, Children Hospital and Institute of Child Health, Faisalabad, Pakistan
| | - Mahnoor Asif
- National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Ilyas Ahmad
- Institute for Cardiogenetics, University of Lübeck, DZHK (German Research Centre for Cardiovascular Research), partner site Hamburg/Lübeck/Kiel, University Heart Center Lübeck, Lübeck, Germany
| | - Shahid Ullah
- Department of General Surgery, Hayatabad Medical Complex, Peshawar, 2500, Pakistan
| | - Humayoon Shafique Satti
- Department of Biological Sciences, National University of Medical Sciences, Rawalpindi, 46000, Pakistan
| | - Raees Khan
- Department of Biological Sciences, National University of Medical Sciences, Rawalpindi, 46000, Pakistan.,NUMS Institute of Advance Studies and Research, National University of Medical Sciences, Rawalpindi, 46000, Pakistan
| | - Muhammad Naeem
- Department of Biological Sciences, National University of Medical Sciences, Rawalpindi, 46000, Pakistan
| | - Mahwish Ali
- Department of Biological Sciences, National University of Medical Sciences, Rawalpindi, 46000, Pakistan.,NUMS Institute of Advance Studies and Research, National University of Medical Sciences, Rawalpindi, 46000, Pakistan
| | - John Rendu
- Inserm, U1216, CHU Grenoble Alpes, Grenoble Institute of Neurosciences, University of Grenoble Alpes, 38000, Grenoble, France
| | - Julien Fauré
- Inserm, U1216, CHU Grenoble Alpes, Grenoble Institute of Neurosciences, University of Grenoble Alpes, 38000, Grenoble, France
| | - Klaus Dieterich
- Inserm, U1209, CHU Grenoble Alpes, Institute of Advanced Biosciences, University of Grenoble Alpes, 38000, Grenoble, France
| | - Xenia Latypova
- Inserm, U1216, CHU Grenoble Alpes, Grenoble Institute of Neurosciences, University of Grenoble Alpes, 38000, Grenoble, France
| | - Shahid Mahmood Baig
- National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan.,Pakistan Science Foundation, Constitution Avenue, Islamabad, Pakistan
| | - Naveed Altaf Malik
- National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Feng Zhang
- Obstetrics and Gynecology Hospital, Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Institute of Reproduction and Development, Fudan University, Shanghai, 200438, China
| | - Tahir Naeem Khan
- Department of Biological Sciences, National University of Medical Sciences, Rawalpindi, 46000, Pakistan. .,NUMS Institute of Advance Studies and Research, National University of Medical Sciences, Rawalpindi, 46000, Pakistan. .,Advanced Center for Translational and Genetic Medicine, Stanley Manne Children's Research Institute, Lurie Children's Hospital, Departments of Pediatrics and Cell and Developmental Biology, Feinberg School of Medicine, Northwestern University, Chicago, United States.
| | - Chunyu Liu
- Obstetrics and Gynecology Hospital, Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Institute of Reproduction and Development, Fudan University, Shanghai, 200438, China.
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5
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Identification of novel mutations by targeted NGS in Moroccan families clinically diagnosed with a neuromuscular disorder. Clin Chim Acta 2022; 524:51-58. [PMID: 34852264 DOI: 10.1016/j.cca.2021.11.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 11/16/2021] [Accepted: 11/20/2021] [Indexed: 01/18/2023]
Abstract
BACKGROUND AND AIMS The identification of underlying genes of genetic conditions has expanded greatly in the past decades, which has broadened the field of genes responsible for inherited neuromuscular diseases. We aimed to investigate mutations associated with neuromuscular disorders phenotypes in 2 Moroccan families. MATERIAL AND METHODS Next-generation sequencing combined with Sanger sequencing could assist with understanding the hereditary variety and underlying disease mechanisms in these disorders. RESULTS Two novel homozygous mutations were described in this study. The SIL1 mutation is the first identified in the Moroccan population, the mutation was identified as the main cause of Marinesco-Sjogren syndrome in one patient. While the second mutation identified in the fatty acid 2-hydroxylase gene (FA2H) was associated with the Spastic paraplegia 35 in another patient, both transmitted in an autosomal recessive pattern. DISCUSSION AND CONCLUSIONS These conditions are extremely rare in the North African population and may be underdiagnosed due to overlapping clinical characteristics and heterogeneity of these diseases. We have reported in this study mutations associated with the diseases found in the patients. In addition, we have narrowed the phenotypic spectrum, as well as the diagnostic orientation of patients with neuromuscular disorders, who might have very similar symptoms to other disease groups.
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6
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Dosi C, Pasquariello R, Ticci C, Astrea G, Trovato R, Rubegni A, Tessa A, Cioni G, Santorelli FM, Battini R. Neuroimaging patterns in paediatric onset hereditary spastic paraplegias. J Neurol Sci 2021; 425:117441. [PMID: 33866115 DOI: 10.1016/j.jns.2021.117441] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 03/06/2021] [Accepted: 04/05/2021] [Indexed: 11/26/2022]
Abstract
Hereditary spastic paraplegias (HSPs) are a clinically and genetically heterogeneous group of neurodegenerative disorders characterized by progressive spasticity and weakness of the lower limbs with a notable phenotypic variation and an autosomal recessive (AR), autosomal dominant (AD), and X-linked inheritance pattern. The recent clinical use of next generation sequencing methods has facilitated the diagnostic approach to HSPs, but the diagnosis remains quite challenging considering its wide clinical and genetic heterogeneity. In this scenario, magnetic resonance imaging (MRI) emerges as a valuable tool in helping to exclude mimicking disorders and to guide genetic testing. The aim of this study is to investigate the presence of possible patterns of morphostructural MRI findings that may provide relevant clues for a specific genetic HSP subtype. In our cohort, for example, white matter abnormalities were the most common finding followed by the thinning of the corpus callosum, which, interestingly, presented different thinning characteristics depending on the HSP subtype.
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Affiliation(s)
- Claudia Dosi
- IRCCS Stella Maris Foundation, Calambrone, 56128 Pisa, Italy
| | | | - Chiara Ticci
- IRCCS Stella Maris Foundation, Calambrone, 56128 Pisa, Italy
| | - Guja Astrea
- IRCCS Stella Maris Foundation, Calambrone, 56128 Pisa, Italy
| | - Rosanna Trovato
- IRCCS Stella Maris Foundation, Calambrone, 56128 Pisa, Italy
| | - Anna Rubegni
- IRCCS Stella Maris Foundation, Calambrone, 56128 Pisa, Italy
| | | | - Giovanni Cioni
- IRCCS Stella Maris Foundation, Calambrone, 56128 Pisa, Italy; Department of Clinical and Experimental Medicine, University of Pisa, 56125 Pisa, Italy
| | | | - Roberta Battini
- IRCCS Stella Maris Foundation, Calambrone, 56128 Pisa, Italy; Department of Clinical and Experimental Medicine, University of Pisa, 56125 Pisa, Italy.
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7
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Rattay TW, Lindig T, Baets J, Smets K, Deconinck T, Söhn AS, Hörtnagel K, Eckstein KN, Wiethoff S, Reichbauer J, Döbler-Neumann M, Krägeloh-Mann I, Auer-Grumbach M, Plecko B, Münchau A, Wilken B, Janauschek M, Giese AK, De Bleecker JL, Ortibus E, Debyser M, Lopez de Munain A, Pujol A, Bassi MT, D'Angelo MG, De Jonghe P, Züchner S, Bauer P, Schöls L, Schüle R. FAHN/SPG35: a narrow phenotypic spectrum across disease classifications. Brain 2020; 142:1561-1572. [PMID: 31135052 DOI: 10.1093/brain/awz102] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 01/15/2019] [Accepted: 02/16/2019] [Indexed: 12/14/2022] Open
Abstract
The endoplasmic reticulum enzyme fatty acid 2-hydroxylase (FA2H) plays a major role in the formation of 2-hydroxy glycosphingolipids, main components of myelin. FA2H deficiency in mice leads to severe central demyelination and axon loss. In humans it has been associated with phenotypes from the neurodegeneration with brain iron accumulation (fatty acid hydroxylase-associated neurodegeneration, FAHN), hereditary spastic paraplegia (HSP type SPG35) and leukodystrophy (leukodystrophy with spasticity and dystonia) spectrum. We performed an in-depth clinical and retrospective neurophysiological and imaging study in a cohort of 19 cases with biallelic FA2H mutations. FAHN/SPG35 manifests with early childhood onset predominantly lower limb spastic tetraparesis and truncal instability, dysarthria, dysphagia, cerebellar ataxia, and cognitive deficits, often accompanied by exotropia and movement disorders. The disease is rapidly progressive with loss of ambulation after a median of 7 years after disease onset and demonstrates little interindividual variability. The hair of FAHN/SPG35 patients shows a bristle-like appearance; scanning electron microscopy of patient hair shafts reveals deformities (longitudinal grooves) as well as plaque-like adhesions to the hair, likely caused by an abnormal sebum composition also described in a mouse model of FA2H deficiency. Characteristic imaging features of FAHN/SPG35 can be summarized by the 'WHAT' acronym: white matter changes, hypointensity of the globus pallidus, ponto-cerebellar atrophy, and thin corpus callosum. At least three of four imaging features are present in 85% of FA2H mutation carriers. Here, we report the first systematic, large cohort study in FAHN/SPG35 and determine the phenotypic spectrum, define the disease course and identify clinical and imaging biomarkers.
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Affiliation(s)
- Tim W Rattay
- Department of Neurodegenerative Diseases, Hertie-Institute for Clinical Brain Research, and Center for Neurology, University of Tübingen, Tübingen, Germany.,German Center of Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Tobias Lindig
- Department of Diagnostic and Interventional Neuroradiology, University Hospital Tübingen, Tübingen, Germany
| | - Jonathan Baets
- Neurogenetics Group, University of Antwerp, Antwerp, Belgium.,Institute Born-Bunge, University of Antwerp, Antwerp, Belgium.,Department of Neurology, Antwerp University Hospital, Antwerp, Belgium
| | - Katrien Smets
- Neurogenetics Group, University of Antwerp, Antwerp, Belgium.,Institute Born-Bunge, University of Antwerp, Antwerp, Belgium.,Department of Neurology, Antwerp University Hospital, Antwerp, Belgium
| | - Tine Deconinck
- Neurogenetics Group, University of Antwerp, Antwerp, Belgium.,Institute Born-Bunge, University of Antwerp, Antwerp, Belgium
| | - Anne S Söhn
- Department of Medical Genetics, Institute of Human Genetics, University of Tübingen, Tübingen, Germany
| | | | - Kathrin N Eckstein
- Department of Neurodegenerative Diseases, Hertie-Institute for Clinical Brain Research, and Center for Neurology, University of Tübingen, Tübingen, Germany.,German Center of Neurodegenerative Diseases (DZNE), Tübingen, Germany.,Department of Psychiatry, University of Tübingen, Tübingen, Germany
| | - Sarah Wiethoff
- Department of Neurodegenerative Diseases, Hertie-Institute for Clinical Brain Research, and Center for Neurology, University of Tübingen, Tübingen, Germany.,German Center of Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Jennifer Reichbauer
- Department of Neurodegenerative Diseases, Hertie-Institute for Clinical Brain Research, and Center for Neurology, University of Tübingen, Tübingen, Germany
| | - Marion Döbler-Neumann
- Department of Pediatric Neurology, University Children's Hospital, Tübingen, Germany
| | | | - Michaela Auer-Grumbach
- Department of Orthopaedics and Trauma-Surgery, Medical University Vienna, Vienna, Austria
| | - Barbara Plecko
- Division of Child Neurology, University Childrens Hospital Zurich, Zurich, Switzerland
| | - Alexander Münchau
- Department of Pediatric and Adult Movement Disorders and Neuropsychiatry, Institute of Neurogenetics, University of Lübeck, Germany
| | - Bernd Wilken
- Department of Neuropediatrics, Klinikum Kassel, Germany
| | - Marc Janauschek
- Department for Social Pediatrics, Kinderhospital Osnabrück, Germany
| | - Anne-Katrin Giese
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | | | - Els Ortibus
- Department of Development and Regeneration, KU Leuven, Leuven, Belgium
| | - Martine Debyser
- Department of Pediatrics, University Hospitals Leuven, Leuven, Belgium
| | - Adolfo Lopez de Munain
- CIBERNED, Center for Networked Biomedical Research into Neurodegenerative Diseases, Madrid, Spain.,Neuroscience Area, Institute Biodonostia, and Department of Neurosciences, University of Basque Country EHU-UPV, San Sebastián, Spain
| | - Aurora Pujol
- Neurometabolic Diseases Laboratory, Institut d'Investigació Biomedica de Bellvitge IDIBELL, Hospital Duran i Reynals, Barcelona, 08908, Spain.,Centre for Biomedical Research on Rare Diseases (CIBERER), Institute Carlos III, Madrid, Spain.,Catalan Institution for Research and Advanced Studies (ICREA), Barcelona, Spain
| | - Maria Teresa Bassi
- Scientific Institute IRCCS E. Medea, Laboratory of Molecular Biology, 23842 Bosisio Parini, Lecco, Italy
| | - Maria Grazia D'Angelo
- Scientific Institute IRCCS E. Medea, Neuromuscular Unit, 23842 Bosisio Parini , Lecco, Italy
| | - Peter De Jonghe
- Neurogenetics Group, University of Antwerp, Antwerp, Belgium.,Institute Born-Bunge, University of Antwerp, Antwerp, Belgium.,Department of Neurology, Antwerp University Hospital, Antwerp, Belgium
| | - Stephan Züchner
- John P. Hussman Institute for Human Genomics, University of Miami, Miller School of Medicine, FL33136 Miami, USA.,Dr. John T. Macdonald Foundation, Department of Human Genetics, FL33136 Miami, USA
| | - Peter Bauer
- Department of Medical Genetics, Institute of Human Genetics, University of Tübingen, Tübingen, Germany.,CENTOGENE AG, Rostock, Germany
| | - Ludger Schöls
- Department of Neurodegenerative Diseases, Hertie-Institute for Clinical Brain Research, and Center for Neurology, University of Tübingen, Tübingen, Germany.,German Center of Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Rebecca Schüle
- Department of Neurodegenerative Diseases, Hertie-Institute for Clinical Brain Research, and Center for Neurology, University of Tübingen, Tübingen, Germany.,German Center of Neurodegenerative Diseases (DZNE), Tübingen, Germany
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8
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Incecik F, Besen S, Bozdogan ST. Hereditary Spastic Paraplegia Type 35 with a Novel Mutation in Fatty Acid 2-Hydroxylase Gene and Literature Review of the Clinical Features. Ann Indian Acad Neurol 2018; 21:335-339. [PMID: 30532373 PMCID: PMC6238570 DOI: 10.4103/aian.aian_106_18] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Faruk Incecik
- Department of Pediatric Neurology, Faculty of Medicine, Cukurova University, Adana, Turkey
| | - Seyda Besen
- Department of Pediatric Neurology, Faculty of Medicine, Cukurova University, Adana, Turkey
| | - Sevcan Tug Bozdogan
- Department of Medical Genetics, Faculty of Medicine, Cukurova University, Adana, Turkey
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9
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Apostolakis S, Kypraiou AM. Iron in neurodegenerative disorders: being in the wrong place at the wrong time? Rev Neurosci 2018; 28:893-911. [PMID: 28792913 DOI: 10.1515/revneuro-2017-0020] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 06/02/2017] [Indexed: 12/22/2022]
Abstract
Brain iron deposits have been reported consistently in imaging and histologic examinations of patients with neurodegenerative disorders. While the origins of this finding have not been clarified yet, it is speculated that impaired iron homeostasis or deficient transport mechanisms result in the accumulation of this highly toxic metal ultimately leading to formation of reactive oxygen species and cell death. On the other hand, there are also those who support that iron is just an incidental finding, a by product of neuronal loss. A literature review has been performed in order to present the key findings in support of the iron hypothesis of neurodegeneration, as well as to identify conditions causing or resulting from iron overload and compare and contrast their features with the most prominent neurodegenerative disorders. There is an abundance of experimental and observational findings in support of the hypothesis in question; however, as neurodegeneration is a rare incident of commonly encountered iron-associated disorders of the nervous system, and this metal is found in non-neurodegenerative disorders as well, it is possible that iron is the result or even an incidental finding in neurodegeneration. Understanding the underlying processes of iron metabolism in the brain and particularly its release during cell damage is expected to provide a deeper understanding of the origins of neurodegeneration in the years to come.
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10
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Mari F, Berti B, Romano A, Baldacci J, Rizzi R, Grazia Alessandrì M, Tessa A, Procopio E, Rubegni A, Lourenḉo CM, Simonati A, Guerrini R, Santorelli FM. Clinical and neuroimaging features of autosomal recessive spastic paraplegia 35 (SPG35): case reports, new mutations, and brief literature review. Neurogenetics 2018; 19:123-130. [DOI: 10.1007/s10048-018-0538-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 01/15/2018] [Indexed: 11/24/2022]
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11
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Abstract
Hereditary ataxias and spastic paraplegias are genetic disorders with age-dependent nearly complete penetrance. The mostly monogenetic etiology allows one to establish the diagnosis, study pathogenesis and to develop new causative therapeutic approaches for these diseases. Both the causative genes as well as the clinical presentation overlap considerably between hereditary ataxias and spastic paraplegias. This strongly argues towards a united classification for these two groups of diseases. Next generation sequencing technologies have greatly expanded the number of genes known to be causative for hereditary ataxias and spastic paraplegias and allow simultaneous time- and cost-effective diagnostic testing of > 200 genes. However, repeat expansions and large genomic deletions must be considered separately. Here, we suggest a pragmatic algorithm for genetic testing in hereditary ataxias and spastic paraplegias that we have developed in our specialized outpatient clinics. Detailed phenotyping remains crucial to interpret the multitude of genetic variants discovered by high throughput sequencing techniques. Despite recent technical advances, a substantial proportion of ataxia and spastic paraplegia families are still without a molecular diagnosis. Beside new and so far undetected ataxia and spasticity genes, unusual mutation types including noncoding variants and polygenic inheritance patterns may contribute. Because of these clinical, genetic, and technological challenges, patients with hereditary ataxias and spastic paraplegias should be referred to specialized centers offering research and clinical studies. This will also help to recruit representative patient cohorts for upcoming interventional trials.
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Affiliation(s)
- R Schüle
- Neurologische Klinik und Hertie-Institut für Klinische Hirnforschung, Eberhard-Karls-Universität, Hoppe-Seyler Str. 3, 72076, Tübingen, Deutschland
- Deutsches Zentrum für Neurodegenerative Erkrankungen, Tübingen, Deutschland
| | - L Schöls
- Neurologische Klinik und Hertie-Institut für Klinische Hirnforschung, Eberhard-Karls-Universität, Hoppe-Seyler Str. 3, 72076, Tübingen, Deutschland.
- Deutsches Zentrum für Neurodegenerative Erkrankungen, Tübingen, Deutschland.
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12
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13
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Aguirre-Rodríguez FJ, Lucenilla MIR, Alvarez-Cubero M, Mata C, Entrala-Bernal C, Fernandez-Rosado F. Novel FA2H mutation in a girl with familial spastic paraplegia. J Neurol Sci 2015; 357:332-4. [DOI: 10.1016/j.jns.2015.07.042] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Revised: 07/27/2015] [Accepted: 07/28/2015] [Indexed: 11/26/2022]
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14
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Dusek P, Litwin T, Czlonkowska A. Wilson disease and other neurodegenerations with metal accumulations. Neurol Clin 2015; 33:175-204. [PMID: 25432729 DOI: 10.1016/j.ncl.2014.09.006] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Trace elements, such as iron, copper, manganese, and calcium, which are essential constituents necessary for cellular homeostasis, become toxic when present in excess quantities. In this article, we describe disorders arising from endogenous dysregulation of metal homeostasis leading to their tissue accumulation. Although subgroups of these diseases lead to regional brain metal accumulation, mostly in globus pallidus, which is susceptible to accumulate divalent metal ions, other subgroups cause systemic metal accumulation affecting the whole brain, liver, and other parenchymal organs. The latter group comprises Wilson disease, manganese transporter deficiency, and aceruloplasminemia and responds favorably to chelation treatment.
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Affiliation(s)
- Petr Dusek
- Department of Neurology and Centre of Clinical Neuroscience, First Faculty of Medicine and General University Hospital in Prague, Charles University in Prague, Kateřinská 30, Prague 128 21, Czech Republic; Institute of Neuroradiology, University Medicine Goettingen, Robert-Koch-Street 40, Göttingen 37075, Germany.
| | - Tomasz Litwin
- 2nd Department of Neurology, Institute Psychiatry and Neurology, Sobieskiego 9, Warsaw 02-957, Poland
| | - Anna Czlonkowska
- 2nd Department of Neurology, Institute Psychiatry and Neurology, Sobieskiego 9, Warsaw 02-957, Poland; Department of Experimental and Clinical Pharmacology, Medical University, Banacha 1b, Warsaw 02-097, Poland
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15
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Marelli C, Salih MA, Nguyen K, Mallaret M, Leboucq N, Hassan HH, Drouot N, Labauge P, Koenig M. Cerebral Iron Accumulation Is Not a Major Feature of FA2H/SPG35. Mov Disord Clin Pract 2015; 2:56-60. [PMID: 30713878 DOI: 10.1002/mdc3.12118] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 11/01/2014] [Accepted: 11/03/2014] [Indexed: 11/05/2022] Open
Abstract
Mutations in the fatty-acid 2-hydroxylase (FA2H) gene cause an autosomal recessive spastic paraplegia (SPG35), often associating with cerebellar ataxia; cerebral MRI may show iron accumulation in the basal ganglia, leading to the inclusion of SPG35 among the causes of neurodegeneration with brain iron accumulation. This finding was initially considered strongly relevant for diagnosis, although its frequency is not yet established. We found 5 novel patients (from two families) with mutations in the FA2H gene: none of them showed cerebral iron accumulation (T2-weighted images performed in all; T2 gradient-echo in 2); notably, in 1 case, iron accumulation was absent even after 18 years from disease onset on both T2 gradient-echo and susceptibility-weight MRI sequences. Cerebral iron accumulation is not a prominent feature in SPG35 and is not always dependent on disease duration; its absence should not discourage from evoking this diagnosis.
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Affiliation(s)
- Cecilia Marelli
- Department of Neurology University Hospital Gui de Chauliac Montpellier France
| | - Mustafa A Salih
- Division of Pediatric Neurology Department of Pediatrics College of Medicine King Saud University Riyadh Saudi Arabia
| | - Karine Nguyen
- Department of Medical Genetics University Hospital "Timone Enfants" Marseille France
| | - Martial Mallaret
- Institute of Genetics and Cellular and Molecular Biology INSERM U964 CNRS UMR7104 University of Strasbourg Illkirch France.,Department of Neurology Strasbourg University Hospital Strasbourg France
| | - Nicolas Leboucq
- Department of Neuroradiology University Hospital Gui de Chauliac Montpellier France
| | - Hamdy H Hassan
- Department of Radiology King Khalid University Hospital and College of Medicine King Saud University Riyadh Saudi Arabia
| | - Nathalie Drouot
- Institute of Genetics and Cellular and Molecular Biology INSERM U964 CNRS UMR7104 University of Strasbourg Illkirch France
| | - Pierre Labauge
- Department of Neurology University Hospital Gui de Chauliac Montpellier France
| | - Michel Koenig
- Institute of Genetics and Cellular and Molecular Biology INSERM U964 CNRS UMR7104 University of Strasbourg Illkirch France.,University Institute of Clinical Research INSERM UMR_S 827 and Laboratoire de Genetique Moleculaire University Hospital Montpellier France
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16
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Astudillo L, Sabourdy F, Therville N, Bode H, Ségui B, Andrieu-Abadie N, Hornemann T, Levade T. Human genetic disorders of sphingolipid biosynthesis. J Inherit Metab Dis 2015; 38:65-76. [PMID: 25141825 DOI: 10.1007/s10545-014-9736-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Accepted: 06/12/2014] [Indexed: 12/19/2022]
Abstract
Monogenic defects of sphingolipid biosynthesis have been recently identified in human patients. These enzyme deficiencies affect the synthesis of sphingolipid precursors, ceramides or complex glycosphingolipids. They are transmitted as autosomal recessive or dominant traits, and their resulting phenotypes often replicate the abnormalities seen in murine models deficient for the corresponding enzymes. In quite good agreement with the known critical roles of sphingolipids in cells from the nervous system and the epidermis, these genetic defects clinically manifest as neurological disorders, including paraplegia, epilepsy or peripheral neuropathies, or present with ichthyosis. The present review summarizes the genetic alterations, biochemical changes and clinical symptoms of this new group of inherited metabolic disorders. Hypotheses regarding the molecular pathophysiology and potential treatments of these diseases are also discussed.
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Affiliation(s)
- Leonardo Astudillo
- Centre de Recherches en Cancérologie de Toulouse (CRCT), Institut National de la Santé et de la Recherche Médicale (INSERM) UMR1037, Team n 4, CHU Rangueil, BP, 84225, 31432, Toulouse, France
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17
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Willet KA, Hama H. Mouse Models of FA2H Deficiency. Mov Disord 2015. [DOI: 10.1016/b978-0-12-405195-9.00060-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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18
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Scheid I, Maruani A, Huguet G, Leblond CS, Nygren G, Anckarsäter H, Beggiato A, Rastam M, Amsellem F, Gillberg IC, Elmaleh M, Leboyer M, Gillberg C, Betancur C, Coleman M, Hama H, Cook EH, Bourgeron T, Delorme R. Heterozygous FA2H mutations in autism spectrum disorders. BMC MEDICAL GENETICS 2013; 14:124. [PMID: 24299421 PMCID: PMC4219428 DOI: 10.1186/1471-2350-14-124] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Accepted: 11/18/2013] [Indexed: 11/16/2022]
Abstract
BACKGROUND Widespread abnormalities in white matter development are frequently reported in cases of autism spectrum disorders (ASD) and could be involved in the disconnectivity suggested in these disorders. Homozygous mutations in the gene coding for fatty-acid 2-hydroxylase (FA2H), an enzyme involved in myelin synthesis, are associated with complex leukodystrophies, but little is known about the functional impact of heterozygous FA2H mutations. We hypothesized that rare deleterious heterozygous mutations of FA2H might constitute risk factors for ASD. METHODS We searched deleterious mutations affecting FA2H, by genotyping 1256 independent patients with ASD genotyped using Genome Wide SNP arrays, and also by sequencing in independent set of 186 subjects with ASD and 353 controls. We then explored the impact of the identified mutations by measuring FA2H enzymatic activity and expression, in transfected COS7 cells. RESULTS One heterozygous deletion within 16q22.3-q23.1 including FA2H was observed in two siblings who share symptoms of autism and severe cognitive impairment, axial T2-FLAIR weighted MRI posterior periventricular white matter lesions. Also, two rare non-synonymous mutations (R113W and R113Q) were reported. Although predictive models suggested that R113W should be a deleterious, we did not find that FA2H activity was affected by expression of the R113W mutation in cultured COS cells. CONCLUSIONS While our results do not support a major role for FA2H coding variants in ASD, a screening of other genes related to myelin synthesis would allow us to better understand the role of non-neuronal elements in ASD susceptibility.
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Affiliation(s)
- Isabelle Scheid
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA2182, Paris, France
- APHP, Robert Debré Hospital, Child and Adolescent Psychiatry, Paris, France
| | - Anna Maruani
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA2182, Paris, France
- APHP, Robert Debré Hospital, Child and Adolescent Psychiatry, Paris, France
| | - Guillaume Huguet
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA2182, Paris, France
| | - Claire S Leblond
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA2182, Paris, France
| | - Gudrun Nygren
- Gillberg Neuropsychiatry Centre, Gothenburg University, Göteborg, Sweden
| | | | - Anita Beggiato
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA2182, Paris, France
- APHP, Robert Debré Hospital, Child and Adolescent Psychiatry, Paris, France
- Fondation FondaMental, French National Science Foundation, Creteil, France
| | - Maria Rastam
- Department of Clinical Sciences, Lund University, Lund, Sweden
| | - Fréderique Amsellem
- APHP, Robert Debré Hospital, Child and Adolescent Psychiatry, Paris, France
- INSERM U955, Psychiatry Genetics, Créteil, France
| | - I Carina Gillberg
- Gillberg Neuropsychiatry Centre, Gothenburg University, Göteborg, Sweden
| | - Monique Elmaleh
- APHP, Robert Debré Hospital Paediatric Imaging, Paris, France
| | - Marion Leboyer
- Fondation FondaMental, French National Science Foundation, Creteil, France
- INSERM U955, Psychiatry Genetics, Créteil, France
| | - Christopher Gillberg
- Gillberg Neuropsychiatry Centre, Gothenburg University, Göteborg, Sweden
- Institute of Child Health, University College London, London, UK
| | - Catalina Betancur
- INSERM U952, Paris, France
- CNRS UMR7224, Paris, France
- UPMC Univ Paris 06, Paris, France
| | - Mary Coleman
- Foundation for Autism Research, Sarasota, Florida 34235-7117, USA
| | - Hiroko Hama
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Edwin H Cook
- Institute for Juvenile Research, Department of Psychiatry, University of Illinois at Chicago, Illinois, USA
| | - Thomas Bourgeron
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA2182, Paris, France
- University Denis Diderot Paris 7, 75013 Paris, France
| | - Richard Delorme
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA2182, Paris, France
- APHP, Robert Debré Hospital, Child and Adolescent Psychiatry, Paris, France
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19
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Kota V, Hama H. 2'-Hydroxy ceramide in membrane homeostasis and cell signaling. Adv Biol Regul 2013; 54:223-30. [PMID: 24139861 DOI: 10.1016/j.jbior.2013.09.012] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2013] [Accepted: 09/15/2013] [Indexed: 01/25/2023]
Abstract
Ceramide is a precursor of complex sphingolipids and also plays important roles in cell signaling. With the advances in lipid analytical technologies, the structural diversity of ceramide species have become evident, and the complexity of cellular metabolism and function associated with distinct ceramide species is beginning to be revealed. One of the common structural variations of ceramide is 2'-hydroxylation of the N-acyl chain. Fatty acid 2-hydroxylase (FA2H) is one of the enzymes that introduce the hydroxyl group during de novo synthesis of ceramide. FA2H is essential for the normal functioning of the nervous system, as evidenced by demyelinating disorder associated with FA2H mutations in humans and mice. Studies of Fa2h mutant mice indicate that lack of 2'-hydroxy galactosylceramide in the myelin membrane results in loss of long-term stability of myelin and eventual demyelination. FA2H also regulates differentiation of various cell types (epidermal keratinocytes, schwannoma cells, adipocytes). When provided exogenously, ceramide induces apoptosis in many cell types. Interestingly, the effective concentration of 2'-hydroxy ceramide that induces apoptosis is significantly lower compared to non-hydroxy ceramide, and cells die much more rapidly, suggesting that 2'-hydroxy ceramide can mediate proapoptotic signaling distinct from non-hydroxy ceramide. Collectively, current evidence clearly shows that 2'-hydroxy ceramide and 2'-hydroxy complex sphingolipids have unique functions in membrane homeostasis and cell signaling that could not be substituted by non-hydroxy counterparts.
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Affiliation(s)
- Venkatesh Kota
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA
| | - Hiroko Hama
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
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20
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Donkervoort S, Dastgir J, Hu Y, Zein WM, Marks H, Blackstone C, Bönnemann CG. Phenotypic variability of a likely FA2H founder mutation in a family with complicated hereditary spastic paraplegia. Clin Genet 2013; 85:393-5. [PMID: 23745665 DOI: 10.1111/cge.12185] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 05/03/2013] [Accepted: 05/03/2013] [Indexed: 11/30/2022]
Affiliation(s)
- S Donkervoort
- Neurogenetics Branch, Neuromuscular and Neurogenetic Disorders of Childhood Section, National Institutes of Health, National Institute of Neurological Disorders and Stroke, Bethesda, MD, USA
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21
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Cao L, Huang XJ, Chen CJ, Chen SD. A rare family with Hereditary Spastic Paraplegia Type 35 due to novel FA2H mutations: A case report with literature review. J Neurol Sci 2013; 329:1-5. [DOI: 10.1016/j.jns.2013.02.026] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Revised: 02/24/2013] [Accepted: 02/28/2013] [Indexed: 12/01/2022]
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