NDLI: Aberrant splicing of HTT generates the pathogenic exon 1 protein in Huntington disease

Content Provider	PubMed Central
Author	Sathasivam, Kirupa Andreas, Neueder Gipson, Theresa A. Landles, Christian Benjamin, Agnesska C. Bondulich, Marie K. Smith, Donna L. Faull, Richard L. M. Roos, Raymund A. C. Howland, David Detloff, Peter J. Housman, David E. Bates, Gillian P.
Abstract	Huntington disease (HD) is a devastating, late-onset, inherited neurodegenerative disorder that manifests with personality changes, movement disorders, and cognitive decline. It is caused by a CAG repeat expansion in exon 1 of the HTT gene that translates to a polyglutamine tract in the huntingtin protein (HTT). The formation of HTT fragments has been implicated as an essential step in the molecular pathogenesis of HD and several proteases that cleave HTT have been identified. However, the importance of smaller N-terminal fragments has been highlighted by their presence in HD postmortem brains and by the fact that nuclear inclusions are only detected by antibodies to the N terminus of HTT. Despite an intense research effort, the precise length of these fragments and the mechanism by which they are generated remains unknown. Here we show that CAG repeat length–dependent aberrant splicing of exon 1 HTT results in a short polyadenylated mRNA that is translated into an exon 1 HTT protein. Given that mutant exon 1 HTT proteins have consistently been shown to be highly pathogenic in HD mouse models, the aberrant splicing of HTT mRNA provides a mechanistic basis for the molecular pathogenesis of HD. RNA-targeted therapeutic strategies designed to lower the levels of HTT are under development. Many of these approaches would not prevent the production of exon 1 HTT and should be reviewed in light of our findings.
Related Links	http://dx.doi.org/10.1073/pnas.1221891110
Ending Page	2370
Page Count	5
Starting Page	2366
File Format	PDF
ISSN	10916490
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	6
Volume Number	110
Language	English
Publisher	National Academy of Sciences
Publisher Date	2013-02-05
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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