A number sign (#) is used with this entry because of evidence that episodic ataxia type 2 (EA2) is caused by heterozygous mutation in the calcium ion channel. PDF | O autor relata um caso clínico de ataxia episódica não familiar responsiva a acetazolamida, semelhante clinicamente a ataxia episódica tipo 2 (EA-2). Ataxia episódica não familiar possivelmente associada com o uso de nicotina: relato de caso. Arq. Neuro-Psiquiatr. [online]. , vol, n.3A, pp

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During later attacks, he also presented with distortions of the left hemifield, ataxia, slurred speech, followed by headache.

In fact, juvenile myoclonic epilepsy and EA5 are allelic and produce proteins with similar dysfunction. GeneReviews is not responsible for the information provided by other organizations.

Channelopathies Neurological disorders Membrane transport protein disorders. These episodes are precipitated by high protein loads and intercurrent illness.

ataxja The phenotype was characterized by onset before age 20 years, attacks lasting hours to days, and associated weakness and dysarthria. Support Center Support Center.

The proportion of cases caused by de novo pathogenic variants is unknown. Clinical spectrum of episodic ataxia type 2. Clinical Synopsis Toggle Dropdown. Epsodica has also been known as periodic vestibulocerebellar ataxia and acetazolamide-responsive episodic ataxia. Attacks can be triggered by stress, exertion, caffeine, alcohol, and phenytoin.

89. Ataxia episódica tipo 2

However, 21 CACNA1A pathogenic variants do not disrupt the reading frame, including 18 pathogenic missense variants resulting in substitutions of conserved amino acids mostly located in the pore regions of the channel [ Pietrobon ]. Because it is likely that testing methodology and our understanding of genes, allelic variants, and diseases will improve in the future, consideration should be given to banking DNA of affected individuals.


For a discussion epispdica genetic heterogeneity of episodic ataxia, see EA1 In a family initially classified as autosomal dominant cerebellar ataxia of unknown type, Jodice et al.

Hill and Sherman described episodic cerebellar ataxia occurring particularly in children in a large kindred with an autosomal dominant pattern of inheritance.

Ataxia episódica não familiar possivelmente associada com o uso de nicotina: relato de caso

University of Washington, Seattle ; Mutations were identified in a total of 46 affected and 8 unaffected family members, demonstrating incomplete penetrance. For all other comments, please send your remarks via contact us. Prenatal Testing and Preimplantation Genetic Diagnosis Once the CACNA1A pathogenic variant has been identified in an affected family member, prenatal testing for a pregnancy at increased risk and preimplantation genetic diagnosis for EA2 are possible.

The authors suggested that dystonia may be a manifestation of a degenerative cerebellar process. OMIM is intended for use primarily by physicians and other professionals concerned with genetic disorders, by genetics researchers, and by advanced students in science and medicine.

The frequency of attacks diminishes with maturation. Episodic ataxia, type 4. Coding and noncoding variation of the human calcium-channel beta4-subunit gene CACNB4 in patients with idiopathic generalized epilepsy and episodic ataxia.

Furthermore, the EA2 phenotype in individuals with small intragenic deletions or duplications is similar to that of individuals with pathogenic missensenonsenseor splice-site variants [ Mantuano et al ]. FHM is characterized by an aura of hemiplegia that is always associated with at least one other aura symptom such as hemianopsia, hemisensory deficit, or aphasia. Episodic ataxia epissodica 3 EA3 is a very rare form of Hereditary episodic ataxia see this term characterized by vestibular ataxia, vertigo, tinnitus, and interictal myokymia.


Onset was before age 20 years in all cases except 1 with reported ataxia at age Am J Hum Genet. Clinical Variability Reinson et al. A locus for the nystagmus-associated form of episodic ataxia maps to an cM region on chromosome 19p. Differential Diagnosis Episodic ataxia can occur sporadically or in a number of hereditary disorders. CC HPO: Intermittent branched-chain ketoaciduria OMIM is characterized by intermittent transient ataxia, intellectual disability, physical developmental delay, feeding problems, and elevation of branched-chain amino acids and keto acids in the urine as well as a distinctive odor of maple syrup to the urine.

Episodic ataxia type 2 EA2 is characterized by paroxysmal attacks of ataxia, vertigo, and nausea typically lasting minutes to days in duration. Sporadic Disorders Sporadic causes of episodic ataxia include multiple sclerosis, Arnold Chiari malformation, vertebral basilar insufficiency, basilar migraine, and labyrinthine abnormalities.