scholarly journals The Contribution of the Cerebellum to Cognition in Spinocerebellar Ataxia Type 6

2010 ◽  
Vol 23 (1-2) ◽  
pp. 3-15 ◽  
Author(s):  
Freya E. Cooper ◽  
Manon Grube ◽  
Kelly J. Elsegood ◽  
John L. Welch ◽  
Thomas P. Kelly ◽  
...  
Keyword(s):  
Executive Function ◽  
Spinocerebellar Ataxia ◽  
Late Onset ◽  
Individual Performance ◽  
Intellectual Ability ◽  
Spinocerebellar Ataxia Type ◽  
Adult Intelligence Scale ◽  
Spinocerebellar Ataxia Type 6 ◽  
Significant Impairment ◽  
Motor Difficulties

This study sought evidence for a specific cerebellar contribution to cognition by characterising the cognitive phenotype of Spinocerebellar Ataxia Type 6 (SCA-6); an autosomal dominant genetic disease which causes a highly specific late-onset cerebellar degeneration. A comprehensive neuropsychological assessment was administered to 27 patients with genetically confirmed SCA-6. General intellectual ability, memory and executive function were examined using internationally standardised tests (Wechsler Adult Intelligence Scale-III, Wechsler Memory Scale-III, Delis and Kaplan Executive Function System, Brixton Spatial Anticipation test). The patient group showed no evidence of intellectual or memory decline. However, tests of executive function involving skills of cognitive flexibility, inhibition of response and verbal reasoning and abstraction demonstrated significant impairment at the group level with large effect sizes. The results demonstrate an executive deficit due to SCA-6 that can be conceptualised as parallel to the motor difficulties suffered by these patients: the data support a role for the cerebellum in the regulation and coordination of cognitive, as well as motor processes that is relevant to individual performance.

scholarly journals Spinocerebellar ataxia type 6 in Brazil

2008 ◽  
Vol 66 (3b) ◽  
pp. 691-694 ◽  
Author(s):  
Hélio A.G. Teive ◽  
Renato Puppi Munhoz ◽  
Salmo Raskin ◽  
Lineu César Werneck
Keyword(s):  
Cerebellar Ataxia ◽  
Spinocerebellar Ataxia ◽  
Late Onset ◽  
Cag Repeat ◽  
Autosomal Dominant Cerebellar Ataxia ◽  
Spinocerebellar Ataxia Type ◽  
Spinocerebellar Ataxia Type 6 ◽  
Voltage Dependent ◽  
Pure Cerebellar Ataxia ◽  
Japanese Ancestry

Spinocerebellar ataxia type 6 (SCA 6) is an autosomal dominant cerebellar ataxia caused by CAG repeat expansion in the SCA6 gene, a alpha 1A voltage-dependent calcium channel subunit gene on chromosome 19p13. SCA-6 is characterized predominantly by slowly progressive pure cerebellar ataxia with late onset. We report three index patients, with pure, late onset, cerebellar ataxia, belonging to three different Brazilian families, all of them with Japanese ancestry, from Hokkaido island of Japan.

scholarly journals Selective Patterns of Cognitive Impairment in Spinocerebellar Ataxia Type 6 and Idiopathic Late-Onset Cerebellar Ataxia

2017 ◽  
Vol 33 (4) ◽  
pp. 427-436 ◽  
Author(s):  
Zubir S Rentiya ◽  
Brian C Jung ◽  
Junun Bae ◽  
Christine M Liszewski ◽  
Ann Fishman ◽  
...  
Keyword(s):  
Cognitive Impairment ◽  
Cerebellar Ataxia ◽  
Spinocerebellar Ataxia ◽  
Late Onset ◽  
Spinocerebellar Ataxia Type ◽  
Spinocerebellar Ataxia Type 6

Bovine CACNA1A gene and comparative analysis of the CAG repeats associated to human spinocerebellar ataxia type-6

Gene ◽  
2006 ◽  
Vol 380 (1) ◽  
pp. 54-61 ◽  
Author(s):  
Eva Andrés-Mateos ◽  
Jesús Cruces ◽  
Jaime Renart ◽  
Luisa M. Solís-Garrido ◽  
Rocío Serantes ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Spinocerebellar Ataxia ◽  
Cag Repeats ◽  
Spinocerebellar Ataxia Type ◽  
Spinocerebellar Ataxia Type 6 ◽  
Cacna1a Gene

Altered frequency-dependent inactivation and steady-state inactivation of polyglutamine-expanded α1A in SCA6

2007 ◽  
Vol 292 (3) ◽  
pp. C1078-C1086 ◽  
Author(s):  
Haiyan Chen ◽  
Erika S. Piedras-Rentería
Keyword(s):  
Steady State ◽  
Late Onset ◽  
Spinocerebellar Ataxia Type ◽  
Gain Of Function ◽  
Calcium Dependent ◽  
Spinocerebellar Ataxia Type 6 ◽  
Dependent Inactivation ◽  
Voltage Dependent ◽  
Steady State Inactivation ◽  
Activity Dependent

Spinocerebellar ataxia type 6 (SCA6) is a neurodegenerative disease of the cerebellum and inferior olives characterized by a late-onset cerebellar ataxia and selective loss of Purkinje neurons ( 15 , 16 ). SCA6 arises from an expansion of the polyglutamine tract located in exon 47 of the α1A (P/Q-type calcium channel) gene from a nonpathogenic size of 4 to 18 glutamines (CAG4–18) to CAG19–33 in SCA6. The molecular basis of SCA6 is poorly understood. To date, the biophysical properties studied in heterologous systems support both a gain and a loss of channel function in SCA6. We studied the behavior of the human α1A isoform, previously found to elicit a gain of function in disease ( 41 ), focusing on properties in which the COOH terminus of the channel is critical for function: we analyzed the current properties in the presence of β4- and β2a-subunits (both known to interact with the α1A COOH terminus), current kinetics of activation and inactivation, calcium-dependent inactivation and facilitation, voltage-dependent inactivation, frequency dependence, and steady-state activation and inactivation properties. We found that SCA6 channels have decreased activity-dependent inactivation and a depolarizing shift (+6 mV) in steady-state inactivation properties consistent with a gain of function.

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