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An antisense CAG repeat transcript at JPH3 locus mediates expanded polyglutamine protein toxicity in Huntington's disease-like 2 mice.

Abstract：

:Huntington's disease-like-2 (HDL2) is a phenocopy of Huntington's disease caused by CTG/CAG repeat expansion at the Junctophilin-3 (JPH3) locus. The mechanisms underlying HDL2 pathogenesis remain unclear. Here we developed a BAC transgenic mouse model of HDL2 (BAC-HDL2) that exhibits progressive motor deficits, selective neurodegenerative pathology, and ubiquitin-positive nuclear inclusions (NIs). Molecular analyses reveal a promoter at the transgene locus driving the expression of a CAG repeat transcript (HDL2-CAG) from the strand antisense to JPH3, which encodes an expanded polyglutamine (polyQ) protein. Importantly, BAC-HDL2 mice, but not control BAC mice, accumulate polyQ-containing NIs in a pattern strikingly similar to those in the patients. Furthermore, BAC mice with genetic silencing of the expanded CUG transcript still express HDL2-CAG transcript and manifest polyQ pathogenesis. Finally, studies of HDL2 mice and patients revealed CBP sequestration into NIs and evidence for interference of CBP-mediated transcriptional activation. These results suggest overlapping polyQ-mediated pathogenic mechanisms in HD and HDL2.

journal_name

Neuron

journal_title

Neuron

authors

Wilburn B,Rudnicki DD,Zhao J,Weitz TM,Cheng Y,Gu X,Greiner E,Park CS,Wang N,Sopher BL,La Spada AR,Osmand A,Margolis RL,Sun YE,Yang XW

doi

10.1016/j.neuron.2011.03.021

subject

Has Abstract

pub_date

2011-05-12 00:00:00

pages

427-40

issue

3

eissn

0896-6273

issn

1097-4199

pii

S0896-6273(11)00291-1

journal_volume

70

pub_type

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