A neuropathological study at autopsy of early onset spinocerebellar ataxia 6.
Spinocerebellar ataxia type 6 (SCA6) is a late-onset, autosomal dominantly inherited ataxic disorder, and most previous clinical studies consider SCA6 to be a "pure" cerebellar ataxia. We carried out a detailed pathoanatomical study at autopsy of two patients, brother and sister, with genetically confirmed SCA6. The disease in both patients was early onset and short, which is atypical for SCA6. We observed severe neurodegeneration in the cerebellum, dentate nucleus and olivary nuclei. Both patients showed evidence of synaptic modification in the cerebellar cortex, which morphologically confirmed the existence of retrograde and anterograde trans-synaptic degeneration secondary to the cerebellar cortical lesion. Furthermore, our study shows for the first time that neurodegeneration in SCA6 occurs in the spinal cord. Finally, our postmortem study confirms that SCA6 is not a simple "pure" cerebellar disease, but a complex neurodegenerative condition in which many extracerebellar structures are involved.
Wang
Xuejing
X
Department of Neurology, Xiangya Hospital, Central South University, Xiangya Road, Changsha, Hunan 410008, PR China.
Wang
Hui
H
Xia
Yujun
Y
Jiang
Hong
H
Shen
Lu
L
Wang
Shoubiao
S
Shen
Ruowu
R
Huang
Liang
L
Wang
Junling
J
Xu
Qian
Q
Li
Xiaohui
X
Luo
Xuegang
X
Tang
Beisha
B
D000328:Adult; D001344:Autopsy / Q000379:methods*; D001921:Brain / Q000473:pathology* / Q000648:ultrastructure; D064026:Calbindins; D015220:Calcium Channels / Q000235:genetics; D005192:Family Health; D005260:Female; D006801:Humans; D008297:Male; D009154:Mutation / Q000235:genetics; D064030:S100 Calcium Binding Protein G / Q000378:metabolism; D016622:Silver Staining / Q000379:methods; D020754:Spinocerebellar Ataxias / Q000235:genetics / Q000473:pathology*; D020864:Calcium Channels, N-Type
D064026:Calbindins; D015220:Calcium Channels; D064030:S100 Calcium Binding Protein G; C105656:CACNA1A protein, human; D020864:Calcium Channels, N-Type