Spinocerebellar ataxia type 1 (SCA1): new pathoanatomical and clinico-pathological insights

Neuropathology and Applied Neurobiology
U RübT Deller

Abstract

Spinocerebellar ataxia type 1 (SCA1) represents the first molecular genetically characterized autosomal dominantly inherited cerebellar ataxia and is assigned to the CAG-repeat or polyglutamine diseases. Owing to limited knowledge about SCA1 neuropathology, appropriate pathoanatomical correlates of a large variety of SCA1 disease symptoms are missing and the neuropathological basis for further morphological and experimental SCA1 studies is still fragmentary. In the present study, we investigated for the first time serial tissue sections through the complete brains of clinically diagnosed and genetically confirmed SCA1 patients. Brain damage in the three SCA1 patients studied went beyond the well-known brain predilection sites of the underlying pathological process. Along with neuronal loss in the primary motor cortex, it included widespread degeneration of gray components of the basal forebrain, thalamus, brainstem and cerebellum, as well as of white matter components in the cerebellum and brainstem. It involved the motor cerebellothalamocortical and basal ganglia-thalamocortical circuits, the visual, auditory, somatosensory, oculomotor, vestibular, ingestion-related, precerebellar, basal forebrain cholinergic and midbrain dopa...Continue Reading

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