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- W2116673443 abstract "Huntington's disease (HD), is a genetic neurodegenerative disease characterized by a DNA CAG triplet repeat expansion in the first exon of the disease gene, HD. CAG DNA expansion results in a polyglutamine tract expansion in mutant huntingtin protein. Wild-type and mutant full-length huntingtin have been detected in the nucleus, but elevated levels of mutant huntingtin and huntingtin amino-terminal proteolytic fragments are seen to accumulate in the nuclei of HD-affected neurons. The presence of huntingtin in both the nucleus and the cytoplasm suggested that huntingtin may be dynamic between these compartments. By live cell time-lapse video microscopy, we have been able to visualize polyglutamine-mediated aggregation and the transient nuclear localization of huntingtin over time in a striatal cell line. A classical nuclear localization signal could not be detected in huntingtin, but we have discovered a nuclear export signal (NES) in the carboxy-terminus of huntingtin. Leptomycin B treatment of clonal striatal cells enhanced the nuclear localization of huntingtin, and a mutant NES huntingtin displayed increased nuclear localization, indicating that huntingtin can shuttle to and from the nucleus. The huntingtin NES is strictly conserved among all huntingtin proteins from diverse species. This export signal may be important in Huntington's disease because this fragment of huntingtin is proteolytically cleaved away during HD. The huntingtin NES therefore defines a potential role for huntingtin as a member of a nucleocytoplasmic dynamic protein complex." @default.
- W2116673443 created "2016-06-24" @default.
- W2116673443 creator A5090853499 @default.
- W2116673443 date "2003-06-15" @default.
- W2116673443 modified "2023-10-07" @default.
- W2116673443 title "Huntingtin contains a highly conserved nuclear export signal" @default.
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- W2116673443 doi "https://doi.org/10.1093/hmg/ddg156" @default.
- W2116673443 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12783847" @default.
- W2116673443 hasPublicationYear "2003" @default.
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