ANO10 mutational screening in recessive ataxia: genetic findings and refinement of the clinical phenotype.

Abstract:

:Autosomal recessive cerebellar ataxia type 3 (ARCA3) is a rare inherited disorder caused by mutations in the ANO10 gene. The disease is characterized by slowly progressive spastic ataxia variably associated with motor neuron involvement, epilepsy, and cognitive decline. We performed mutational screening in 80 patients with sporadic or autosomal recessive adult-onset ataxia. We identified 11 ANO10 gene variants in 10 patients from 8 families (10%): 4 mutations were previously described and 7 were novel. Age at onset ranged between 27 and 53 years. All patients presented ataxia, pyramidal signs and cerebellar atrophy at brain MRI. Additional signs were bradykinesia (7/10), mild vertical gaze paresis (5/10), pes cavus (4/10), and sphincteric disturbances (3/10). Six patients, with normal MMSE score, failed several neuropsychological tests rating executive functions. Three patients had giant somatosensory evoked potentials and epileptic spikes in EEG without clinical evidence of seizures. Our observational study indicates a high frequency of ARCA3 disease in sporadic patients with adult-onset cerebellar ataxia. We extended the ANO10 mutational spectrum with the identification of novel gene variants, and further defined the clinical, cognitive, and neurophysiological features in a new cohort of patients. These findings may contribute to the refinement of the complex ARCA3 phenotype and be valuable in clinical management and natural history studies.

journal_name

J Neurol

journal_title

Journal of neurology

authors

Nanetti L,Sarto E,Castaldo A,Magri S,Mongelli A,Rossi Sebastiano D,Canafoglia L,Grisoli M,Malaguti C,Rivieri F,D'Amico MC,Di Bella D,Franceschetti S,Mariotti C,Taroni F

doi

10.1007/s00415-018-9141-z

subject

Has Abstract

pub_date

2019-02-01 00:00:00

pages

378-385

issue

2

eissn

0340-5354

issn

1432-1459

pii

10.1007/s00415-018-9141-z

journal_volume

266

pub_type

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