Differential distribution of the normal and mutated forms of huntingtin in the human brain.

Abstract:

:Huntington's disease is an inherited disorder caused by expansion of a CAG trinucleotide repeat in the IT15 gene, which leads to expansion of a polyglutamine tract within the protein called huntingtin. Despite the characterization of the IT15 gene and the mutation involved in the disease, the normal function of huntingtin and the effects of the mutation on its function and on its neuronal location remain unknown. To study whether mutated huntingtin has the same neuronal distribution and intracellular location as normal huntingtin, we analyzed immunohistochemically both forms of this protein in the brain of 5 controls and 5 patients with Huntington's disease. We show that the distribution of mutated huntingtin is, like that of the normal form, heterogeneous throughout the brain, but is not limited to vulnerable neurons in Huntington's disease, supporting the hypothesis that the presence of the mutated huntingtin in a neuron is not in itself sufficient to lead to neuronal death. Moreover, whereas normal huntingtin is detected in some neuronal perikarya, nerve fibers, and nerve endings, the mutated form is observed in some neuronal perikarya and proximal nerve processes but is not detectable in nerve endings. Our results suggest that the expression or processing of the mutated huntingtin in perikarya and nerve endings differs quantitatively or qualitatively from the expression of the normal form in the same neuronal compartments.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Gourfinkel-An I,Cancel G,Trottier Y,Devys D,Tora L,Lutz Y,Imbert G,Saudou F,Stevanin G,Agid Y,Brice A,Mandel JL,Hirsch EC

doi

10.1002/ana.410420507

subject

Has Abstract

pub_date

1997-11-01 00:00:00

pages

712-9

issue

5

eissn

0364-5134

issn

1531-8249

journal_volume

42

pub_type

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