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Ley Martos M, Salado Reyes MJ, Marín Iglesias R, Gutiérrez Moro C, Lubián Gutiérrez M, Estepa Pedregosa L. A New Allelic Variant in the PANK2 Gene in a Patient with Incomplete HARP Syndrome. J Mov Disord 2020; 13:229-231. [PMID: 32654475 PMCID: PMC7502299 DOI: 10.14802/jmd.19071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 05/08/2020] [Indexed: 11/24/2022] Open
Affiliation(s)
- Myriam Ley Martos
- Department of Neuropediatrics, Puerta del Mar Hospital, Cádiz, Spain
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2
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Walker RH. Update on the Non-Huntington's Disease Choreas with Comments on the Current Nomenclature. Tremor Other Hyperkinet Mov (N Y) 2012; 2:tre-02-49-211-1. [PMID: 23440598 PMCID: PMC3570038 DOI: 10.7916/d89p30cs] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 08/08/2011] [Indexed: 12/23/2022] Open
Abstract
CHOREA CAN BE CAUSED BY A MULTITUDE OF ETIOLOGIES: neurodegenerative, pharmacological, structural, metabolic, and others. In absence of other apparent causes, exclusion of Huntington's disease is often a first step in the diagnostic process. There are a number of neurodegenerative disorders whose genetic etiology has been identified in the past decade. Molecular diagnosis has enabled genetic identification of disorder subtypes which were previously grouped together, such as the neurodegeneration with brain iron accumulation disorders and the neuroacanthocytosis syndromes, as well as identification of phenotypic outliers for recognized disorders. Correct molecular diagnosis is essential for genetic counseling and, hopefully, ultimately genetic therapies. In addition, there has recently been recognition of other disorders which can mimic neurodegenerative disorders, including paraneoplastic and prion disorders. This article focuses upon recent developments in the field but is not intended to provide an exhaustive review of all causes of chorea, which is available elsewhere. I also discuss the nomenclature of these disorders which has become somewhat unwieldy, but may ultimately be refined by association with the causative gene.
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Affiliation(s)
- Ruth H. Walker
- Departments of Neurology, James J. Peters Veterans Affairs Medical Center, Bronx, New York, United States of America
- Mount Sinai School of Medicine, New York City, New York, United States of America
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Uversky VN. Flexible Nets of Malleable Guardians: Intrinsically Disordered Chaperones in Neurodegenerative Diseases. Chem Rev 2010; 111:1134-66. [DOI: 10.1021/cr100186d] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Vladimir N. Uversky
- Department of Molecular Medicine, University of South Florida, Tampa, Florida 33612, United States, Institute for Intrinsically Disordered Protein Research, Center for Computational Biology and Bioinformatics, University of Indiana School of Medicine, Indianapolis, Indiana 46202, United States, and Institute for Biological Instrumentation, Russian Academy of Sciences, 142292 Pushchino, Moscow Region, Russia
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Uversky VN, Eliezer D. Biophysics of Parkinson's disease: structure and aggregation of alpha-synuclein. Curr Protein Pept Sci 2009; 10:483-99. [PMID: 19538146 PMCID: PMC3786709 DOI: 10.2174/138920309789351921] [Citation(s) in RCA: 243] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2009] [Accepted: 02/05/2009] [Indexed: 12/21/2022]
Abstract
Parkinson's disease (PD) is a slowly progressive movement disorder that results from the loss of dopaminergic neurons in the substantia nigra, a small area of cells in the mid-brain. PD is a multifactorial disorder with unknown etiology, in which both genetic and environmental factors play important roles. Substantial evidence links alpha-synuclein, a small highly conserved presynaptic protein with unknown function, to both familial and sporadic PD. Rare familial cases of PD are associated with missense point mutations in alpha-synuclein, or with the hyper-expression of the wild type protein due to its gene duplication/triplication. Furthermore, alpha-synuclein was identified as the major component of amyloid fibrils found in Lewy body and Lewy neurites, the characteristic proteinaceous deposits that are the diagnostic hallmarks of PD. alpha-Synuclein is abundant in various regions of the brain and has two closely related homologs, beta-synuclein and gamma-synuclein. When isolated in solution, the protein is intrinsically disordered, but in the presence of lipid surfaces alpha-synuclein adopts a highly helical structure that is believed to mediate its normal function(s). A number of different conformational states of alpha-synuclein have been observed. Besides the membrane-bound form, other critical conformations include a partially-folded state that is a key intermediate in aggregation and fibrillation, various oligomeric species, and fibrillar and amorphous aggregates. A number of intrinsic and extrinsic factors that either accelerate or inhibit the rate of alpha-synuclein aggregation and fibrillation in vitro are known. There is a strong correlation between the conformation of alpha-synuclein (induced by various factors) and its rate of fibrillation. The aggregation process appears to be branched, with one pathway leading to fibrils and another to oligomeric intermediates that may ultimately form amorphous deposits. The molecular basis of Parkinson's disease appears to be tightly coupled to the aggregation of alpha-synuclein and the factors that affect its conformation. This review focuses on the contributions of Prof. Anthony L. Fink to the field and presents some recent developments in this exciting area.
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Affiliation(s)
- Vladimir N. Uversky
- Institite for Intrinsically Disordered Protein Research, Center for Computational Biology and Bioinformatics, Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Institute for Biological Instrumentation, Russian Academy of Sciences, 142290 Pushchino, Moscow Region, Russia
| | - David Eliezer
- Department of Biochemistry and Program in Structural Biology, Weill Cornell Medical College, New York, New York 10021, USA
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Intrinsic Disorder in Proteins Associated with Neurodegenerative Diseases. PROTEIN FOLDING AND MISFOLDING: NEURODEGENERATIVE DISEASES 2008. [DOI: 10.1007/978-1-4020-9434-7_2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Gregory A, Polster BJ, Hayflick SJ. Clinical and genetic delineation of neurodegeneration with brain iron accumulation. J Med Genet 2008; 46:73-80. [PMID: 18981035 DOI: 10.1136/jmg.2008.061929] [Citation(s) in RCA: 233] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Neurodegeneration with brain iron accumulation (NBIA) describes a group of progressive neurodegenerative disorders characterised by high brain iron and the presence of axonal spheroids, usually limited to the central nervous system. Mutations in the PANK2 gene account for the majority of NBIA cases and cause an autosomal recessive inborn error of coenzyme A metabolism called pantothenate kinase associated neurodegeneration (PKAN). More recently, it was found that mutations in the PLA2G6 gene cause both infantile neuroaxonal dystrophy (INAD) and, more rarely, an atypical neuroaxonal dystrophy that overlaps clinically with other forms of NBIA. High brain iron is also present in a portion of these cases. Clinical assessment, neuroimaging, and molecular genetic testing all play a role in guiding the diagnostic evaluation and treatment of NBIA.
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Affiliation(s)
- A Gregory
- Molecular and Medical Genetics, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA.
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Abstract
Aggregation and subsequent development of protein deposition diseases originate from conformational changes in corresponding amyloidogenic proteins. The accumulated data support the model where protein fibrillogenesis proceeds via the formation of a relatively unfolded amyloidogenic conformation, which shares many structural properties with the pre-molten globule state, a partially folded intermediate first found during the equilibrium and kinetic (un)folding studies of several globular proteins and later described as one of the structural forms of natively unfolded proteins. The flexibility of this structural form is essential for the conformational rearrangements driving the formation of the core cross-beta structure of the amyloid fibril. Obviously, molecular mechanisms describing amyloidogenesis of ordered and natively unfolded proteins are different. For ordered protein to fibrillate, its unique and rigid structure has to be destabilized and partially unfolded. On the other hand, fibrillogenesis of a natively unfolded protein involves the formation of partially folded conformation; i.e., partial folding rather than unfolding. In this review recent findings are surveyed to illustrate some unique features of the natively unfolded proteins amyloidogenesis.
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Affiliation(s)
- Vladimir N Uversky
- Department of Biochemistry and Molecular Biology, Center for Computational Biology and Bioinformatics, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
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Walker RH, Danek A, Dobson-Stone C, Guerrini R, Jung HH, Lafontaine AL, Rampoldi L, Tison F, Andermann E. Developments in neuroacanthocytosis: Expanding the spectrum of choreatic syndromes. Mov Disord 2006; 21:1794-805. [PMID: 16958034 DOI: 10.1002/mds.21108] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
As with other neurodegenerative disorders, research into the group of diseases known under the umbrella term of "neuroacanthocytosis" has greatly benefited from the identification of causative genes. The distinct and unifying aspect of these disorders is the presence of thorny deformations of circulating erythrocytes. This may be due to abnormal properties of red cell membranes, which could lead to insights into mechanisms of neurodegeneration. Research approaches in this field, in addition to examining functions and protein interactions of the affected proteins with particular respect to neurons, have also drawn upon the expertise of hematologists and red cell membrane biologists. In this article, recent developments in the field are presented.
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Affiliation(s)
- Ruth H Walker
- Department of Neurology, Veterans Affairs Medical Center, Bronx, and Mount Sinai School of Medicine, New York, NY 10468, USA.
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Neuroacanthocytosis. NEURODEGENER DIS 2005. [DOI: 10.1017/cbo9780511544873.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Abstract
The historic and current status of Hallervorden-Spatz syndrome diagnosis, classification, and therapies are discussed. A number of symptomatic therapies are available and should be used optimally for each patient. Although one gene locus has been identified, many patients do not manifest linkage to the NBIA1 locus (neurodegeneration with brain iron accumulation). Further investigation is necessary. The lack of understanding of the basic mechanisms that underlie the syndrome have hindered the development of more meaningful classification and definitive therapies. The recent report of a defect in a novel pantothenate kinase gene (PANK2) in Hallervorden-Spatz syndrome will undoubtedly lead the way to future advances in the diagnosis and management of the syndrome. The clarification of the role of oxidative distress in the pathophysiology of the syndrome will fill a large void in the understanding of the condition.
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Affiliation(s)
- K F Swaiman
- Division of Pediatric Neurology, Department of Neurology, University of Minnesota, Minneapolis, USA
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Galvin JE, Giasson B, Hurtig HI, Lee VM, Trojanowski JQ. Neurodegeneration with brain iron accumulation, type 1 is characterized by alpha-, beta-, and gamma-synuclein neuropathology. THE AMERICAN JOURNAL OF PATHOLOGY 2000; 157:361-8. [PMID: 10934140 PMCID: PMC1850114 DOI: 10.1016/s0002-9440(10)64548-8] [Citation(s) in RCA: 141] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Neurodegeneration with brain iron accumulation, type 1 (NBIA 1), or Hallervorden-Spatz syndrome, is a rare neurodegenerative disorder characterized clinically by Parkinsonism, cognitive impairment, pseudobulbar features, as well as cerebellar ataxia, and neuropathologically by neuronal loss, gliosis, and iron deposition in the globus pallidus, red nucleus, and substantia nigra. The hallmark pathological lesions of NBIA 1 are axonal spheroids, but Lewy body (LB)-like intraneuronal inclusions, glial inclusions, and rare neurofibrillary tangles also occur. Here we show that there is an accumulation of alpha-synuclein (alphaS) in LB-like inclusions, glial inclusions, and spheroids in the brains of three NBIA 1 patients. Further, beta-synuclein (betaS) and gamma-synuclein (gammaS) immunoreactivity was detected in spheroids but not in LB-like or glial inclusions. Western blot analysis demonstrated high-molecular weight alphaS aggregates in the high-salt-soluble and Triton X-100-insoluble/sodium dodecyl sulfate-soluble fraction of the NBIA 1 brain. Significantly, the levels of alphaS were markedly reduced in the Triton X-100-soluble fractions compared to control brain, and unlike other synucleinopathies, insoluble alphaS did not accumulate in the formic acid-soluble fraction. These findings expand the concept of neurodegenerative synucleinopathies by implicating alphaS, betaS, and gammaS in the pathogenesis of NBIA 1.
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Affiliation(s)
- J E Galvin
- Department of Neurology, Medical College of Pennsylvania Hahnemann University. the Center for Neurodegenerative Disease Research, and the Department of Neurology, the University of Pennsylvania, Philadelphia, Pennsylvania, USA
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