Inherited Ataxias

2015 ◽  
Author(s):  
Susan Perlman
Keyword(s):  
Autosomal Recessive ◽  
Autosomal Dominant ◽  
Friedreich Ataxia ◽  
Spinocerebellar Ataxias ◽  
Recessive Ataxia ◽  
Internet Resources ◽  
Genetic Abnormalities ◽  
Repeat Expansions ◽  
The Common ◽  
Inherited Ataxias

The inherited ataxias are disorders that cause progressive imbalance as a result of pathology in the cerebellum and its various connecting pathways. Autosomal recessive ataxias include Friedreich ataxia, ataxia with isolated vitamin E deficiency, ataxia-telangiectasia, and autosomal recessive ataxia of Charlevoix-Saguenay, among others. A discussion of autosomal dominant ataxias covers spinocerebellar ataxias (SCA) types 1 through 14, dentatorubral pallidoluysian atrophy (DRPLA), and episodic ataxia (EA) syndromes. Clinical features, laboratory studies, differential diagnosis, and management of inherited ataxias are discussed. Tables describe both autosomal recessive ataxias and autosomal dominant ataxias (with known gene loci), childhood– or young adult–onset ataxias with ill-defined genetic abnormalities, phenotypic features that may indicate a specific genotype in the common autosomal dominant ataxias, and normal and expanded ranges of various repetitive nucleotide sequences in inherited ataxias. Figures include a diagrammatic representation of the type of repeat expansions associated with ataxias, aggregates of ataxin 3, a schematic of some of the proposed pathogenic mechanisms in the polyglutamine ataxias, and dystonia in a patient with SCA3. A sidebar offers selected Internet resources for information on ataxias. This chapter contains 64 references.

scholarly journals Ataxias with Autosomal, X-Chromosomal or Maternal Inheritance

2009 ◽  
Vol 36 (4) ◽  
pp. 409-428 ◽  
Author(s):  
Josef Finsterer
Keyword(s):  
Ataxia Telangiectasia ◽  
Large Scale ◽  
Autosomal Recessive ◽  
Autosomal Dominant ◽  
Late Onset ◽  
Fragile X ◽  
Axonal Neuropathy ◽  
Friedreich Ataxia ◽  
Point Mutations ◽  
Spinocerebellar Ataxias

Heredoataxias are a group of genetic disorders with a cerebellar syndrome as the leading clinical manifestation. The current classification distinguishes heredoataxias according to the trait of inheritance into autosomal dominant, autosomal recessive, X-linked, and maternally inherited heredoataxias. The autosomal dominant heredoataxias are separated into spinocerebellar ataxias (SCA1-8, 10-15, 17-23, 25-30, and dentato-rubro-pallido-luysian atrophy), episodic ataxias (EA1-7), and autosomal dominant mitochondrial heredoataxias (Leigh syndrome, MIRAS, ADOAD, and AD-CPEO). The autosomal recessive ataxias are separated into Friedreich ataxia, ataxia due to vitamin E deficiency, ataxia due to Abeta-lipoproteinemia, Refsum disease, late-onset Tay-Sachs disease, cerebrotendineous xanthomatosis, spinocerebellar ataxia with axonal neuropathy, ataxia telangiectasia, ataxia telangiectasia-like disorder, ataxia with oculomotor apraxia 1 and 2, spastic ataxia of Charlevoix-Saguenay, Cayman ataxia, Marinesco-Sjögren syndrome, and autosomal recessive mitochondrial ataxias (AR-CPEO, SANDO, SCAE, AHS, IOSCA, MEMSA, LBSL CoQ-deficiency, PDC-deficiency). Only two of the heredoataxias, fragile X/tremor/ataxia syndrome, and XLSA/A are transmitted via an X-linked trait. Maternally inherited heredoataxias are due to point mutations in genes encoding for tRNAs, rRNAs, respiratory chain subunits or single large scale deletions/duplications of the mitochondrial DNA and include MELAS, MERRF, KSS, PS, MILS, NARP, and non-syndromic mitochondrial disorders. Treatment of heredoataxias is symptomatic and supportive and may have a beneficial effect in single patients.**Please see page 424 for abbreviation list.

scholarly journals Twenty-five years since the identification of the first SCA gene: history, clinical features and perspectives for SCA1

2018 ◽  
Vol 76 (8) ◽  
pp. 555-562 ◽  
Author(s):  
Carlos Roberto Martins Junior ◽  
Fabrício Castro de Borba ◽  
Alberto Rolim Muro Martinez ◽  
Thiago Junqueira Ribeiro de Rezende ◽  
Iscia Lopes Cendes ◽  
...  
Keyword(s):  
Clinical Features ◽  
Autosomal Dominant ◽  
Trinucleotide Repeat ◽  
Point Of View ◽  
Spinocerebellar Ataxias ◽  
Coding Region ◽  
The Past ◽  
Monogenic Diseases ◽  
Repeat Expansions ◽  
Core Features

ABSTRACT Spinocerebellar ataxias (SCA) are a clinically and genetically heterogeneous group of monogenic diseases that share ataxia and autosomal dominant inheritance as the core features. An important proportion of SCAs are caused by CAG trinucleotide repeat expansions in the coding region of different genes. In addition to genetic heterogeneity, clinical features transcend motor symptoms, including cognitive, electrophysiological and imaging aspects. Despite all the progress in the past 25 years, the mechanisms that determine how neuronal death is mediated by these unstable expansions are still unclear. The aim of this article is to review, from an historical point of view, the first CAG-related ataxia to be genetically described: SCA 1.

Ataxias

2017 ◽  
Author(s):  
Vikram G. Shakkottai
Keyword(s):  
Cerebellar Ataxia ◽  
Autosomal Recessive ◽  
Friedreich Ataxia ◽  
Specific Treatment ◽  
Specific Gene ◽  
Progressive Cerebellar Ataxia ◽  
Cerebellar Ataxias ◽  
Gene Defects ◽  
Inherited Ataxias ◽  
Autosomal Recessive Cerebellar Ataxias

Autosomal recessive cerebellar ataxias are a group of inherited neurological disorders with progressive balance and gait difficulties. In these disorders, cerebellar ataxia is often accompanied by eye movement abnormalities and peripheral nervous system involvement. A unifying mechanism for disease pathogenesis that is common to all the recessive ataxias likely does not exist. Nevertheless, some pathophysiological pathways are common to several autosomal recessive cerebellar ataxias. Specific gene defects in each disorder are summarized in the chapter. The most common recessively inherited ataxias are Friedreich ataxia and Ataxia telangiectasia. A recessive ataxia must be considered for any individual with progressive cerebellar ataxia with onset less than 30 years. The treatment is primarily supportive, but some recessive ataxias have specific treatment.

scholarly journals Clinical and molecular studies in five Brazilian cases of Friedreich ataxia

1999 ◽  
Vol 57 (1) ◽  
pp. 1-5 ◽  
Author(s):  
IDA V.D. SCHWARTZ ◽  
LAURA B. JARDIM ◽  
ANA C.S. PUGA ◽  
SÉRGIO COCOZZA ◽  
SANDRA LEISTNER ◽  
...  
Keyword(s):  
Autosomal Recessive ◽  
Friedreich Ataxia ◽  
Recessive Ataxia ◽  
Atypical Case ◽  
Autosomal Recessive Ataxia ◽  
Intron 1 ◽  
Molecular Studies ◽  
Atypical Manifestations ◽  
Gaa Expansion ◽  
Tendon Reflexes

Friedreich ataxia (FRDA), the most common autosomal recessive ataxia, is caused in 94% of cases by homozygous expansions of an unstable GAA repeat localised in intron 1 of the X25 gene. We have investigated this mutation in five Brazilian patients: four with typical FRDA findings and one patient with atypical manifestations, who was considered to have some other form of cerebellar ataxia with retained reflexes. The GAA expansion was detected in all these patients. The confirmation of FRDA diagnosis in the atypical case may be pointing out, as in other reports, that clinical spectrum of Friedreich's ataxia is broader than previously recognised and includes cases with intact tendon reflexes.

scholarly journals Clinical Characteristics and Possible Drug Targets in Autosomal Dominant Spinocerebellar Ataxias

2019 ◽  
Vol 18 (4) ◽  
pp. 279-293 ◽  
Author(s):  
Laszlo Szpisjak ◽  
Denes Zadori ◽  
Peter Klivenyi ◽  
Laszlo Vecsei
Keyword(s):  
Drug Targets ◽  
Autosomal Dominant ◽  
Scientific Progress ◽  
Cag Repeat ◽  
Motor Dysfunction ◽  
Spinocerebellar Ataxias ◽  
Coding Region ◽  
Causative Gene ◽  
Gene Therapies ◽  
Repeat Expansions

Background & Objective: The autosomal dominant spinocerebellar ataxias (SCAs) belong to a large and expanding group of neurodegenerative disorders. SCAs comprise more than 40 subtypes characterized by progressive ataxia as a common feature. The most prevalent diseases among SCAs are caused by CAG repeat expansions in the coding-region of the causative gene resulting in polyglutamine (polyQ) tract formation in the encoded protein. Unfortunately, there is no approved therapy to treat cerebellar motor dysfunction in SCA patients. In recent years, several studies have been conducted to recognize the clinical and pathophysiological aspects of the polyQ SCAs more accurately. This scientific progress has provided new opportunities to develop promising gene therapies, including RNA interference and antisense oligonucleotides. Conclusion: The aim of the current work is to give a brief summary of the clinical features of SCAs and to review the cardinal points of pathomechanisms of the most common polyQ SCAs. In addition, we review the last few year’s promising gene suppression therapies of the most frequent polyQ SCAs in animal models, on the basis of which human trials may be initiated in the near future.

scholarly journals Adult Onset Spinocerebellar Ataxia in a Canadian Movement Disorders Clinic

2005 ◽  
Vol 32 (4) ◽  
pp. 450-458 ◽  
Author(s):  
Scott Kraft ◽  
Sarah Furtado ◽  
Ranjit Ranawaya ◽  
Jillian Parboosingh ◽  
Stacey Bleoo ◽  
...  
Keyword(s):  
Family History ◽  
Movement Disorders ◽  
Autosomal Recessive ◽  
Fragile X ◽  
Positive Family History ◽  
Friedreich Ataxia ◽  
Genetic Diagnosis ◽  
Common Mutation ◽  
Adult Onset ◽  
Spinocerebellar Ataxias

ABSTRACT:Background:The spinocerebellar ataxias (SCAs) are a genetically and clinically heterogeneous group of neurodegenerative disorders. Relative frequencies vary within different ethnic groups and geographical locations.Objectives:1) To determine the frequencies of hereditary and sporadic adult onset SCAs in the Movement Disorders population; 2) to assess if the fragile X mental retardation gene 1 (FMR1) premutation is found in this population.Methods:A retrospective chart review of individuals with a diagnosis of adult onset SCA was carried out. Testing for SCA types 1, 2, 3, 6, 7, and 8, Dentatorubral-pallidoluysian atrophy (DRPLA), Friedreich ataxia and the FMR1 expansion was performed.Results:A total of 69 patients in 60 families were identified. Twenty-one (35%) of the families displayed autosomal dominant and two (3.3%) showed autosomal recessive (AR) pattern of inheritance. A positive but undefined family history was noted in nine (15%). The disorder appeared sporadic in 26 patients (43.3%). In the AD families, the most common mutation was SCA3 (23.8%) followed by SCA2 (14.3%) and SCA6 (14.3%). The SCA1 and SCA8 were each identified in 4.8%. FA was found in a pseudodominant pedigree, and one autosomal recessive pedigree. One sporadic patient had a positive test (SCA3).Dentatorubral-pallidoluysian atrophy and FMR1 testing was negative.Conclusion:A positive family history was present in 53.3% of our adult onset SCA patients. A specific genetic diagnosis could be given in 61.9% of dominant pedigrees with SCA3 being the most common mutation, followed by SCA2 and SCA6. The yield in sporadic cases was low. The fragile X premutation was not found to be responsible for SCA.

Cerebellar Disorders and Ataxias: Inherited Disorders

2021 ◽  
pp. 618-631
Author(s):  
Anhar Hassan
Keyword(s):  
Autosomal Recessive ◽  
Autosomal Dominant ◽  
Fragile X ◽  
Cerebellar Atrophy ◽  
Clinical Approach ◽  
Inherited Disorders ◽  
Inherited Ataxias ◽  
Ataxia Syndrome ◽  
Cerebellar Disorders

Disorders of the cerebellum or its circuitry can result in ataxia. These disorders may be acquired or inherited. Inherited ataxias may be autosomal recessive (eg. Friedrich ataxia), autosomal dominant (eg, spinal cerebellar atrophy) or X linked (eg, fragile X–associated ataxia syndrome). Chapter 73 (“Cerebellar Disorders and Ataxias: Acquired Disorders”) reviews the clinical approach to patients with ataxia and discusses acquired forms of ataxia. This chapter reviews clinical approaches, diagnostic details, and treatment of inherited ataxias.

Can progression of autosomal dominant or autosomal recessive polycystic kidney disease be prevented?

2001 ◽  
Vol 21 (5) ◽  
pp. 430-440 ◽  
Author(s):  
Ira D. Davis ◽  
Katherine MacRae Dell ◽  
William E. Sweeney ◽  
Ellis D. Avner
Keyword(s):  
Kidney Disease ◽  
Polycystic Kidney Disease ◽  
Autosomal Recessive ◽  
Autosomal Dominant ◽  
Polycystic Kidney

CANVAS is a common form of late-onset hereditary ataxia

2020 ◽  
pp. 51-52
Author(s):  
Е.П. Нужный ◽  
Н.Ю. Абрамычева ◽  
Е.Г. Воробьева ◽  
Е.О. Иванова ◽  
Ю.А. Шпилюкова ◽  
...  
Keyword(s):  
Cerebellar Ataxia ◽  
Clinical Picture ◽  
Autosomal Recessive ◽  
Late Onset ◽  
Repeat Expansion ◽  
Hereditary Ataxia ◽  
Recessive Ataxia ◽  
Autosomal Recessive Ataxia

Синдром CANVAS (мозжечковая атаксия, невропатия и вестибулярная арефлексия) - аутосомно-рецессивная атаксия с поздним дебютом, обусловленная носительством биаллельной экспансии (AAGGG)n во 2-м интроне гена RFC1. До настоящего момента отсутствуют сведения о распространенности данного заболевания в российских семьях. Нами был проведен поиск биаллельной экспансии AAGGG-повторов у 35 российских пациентов с поздней мозжечковой атаксией. Верифицированы 5 пациентов (14,3%) с синдромом CANVAS и характерной клинической картиной. CANVAS (cerebellar ataxia, neuropathy and vestibular areflexia) is a late-onset autosomal recessive ataxia due to biallelic (AAGGG)n repeat expansion in the 2nd intron of the RFC1 gene. There is no information on the CANVAS prevalence in Russian families. We searched for biallelic expansion of AAGGG repeats in 35 Russian patients with late-onset cerebellar ataxia. Five patients (14.3%) with CANVAS syndrome and a characteristic clinical picture were verified.

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