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Reversibility of neuropathology and motor deficits in an inducible mouse model for FXTAS.

Abstract：

:Fragile X-associated tremor/ataxia syndrome (FXTAS) is a late-onset neurodegenerative disorder affecting carriers of the fragile X-premutation, who have an expanded CGG repeat in the 5'-UTR of the FMR1 gene. FXTAS is characterized by progressive development of intention tremor, ataxia, parkinsonism and neuropsychological problems. The disease is thought to be caused by a toxic RNA gain-of-function mechanism, and the major hallmark of the disease is ubiquitin-positive intranuclear inclusions in neurons and astrocytes. We have developed a new transgenic mouse model in which we can induce expression of an expanded repeat in the brain upon doxycycline (dox) exposure (i.e. Tet-On mice). This Tet-On model makes use of the PrP-rtTA driver and allows us to study disease progression and possibilities of reversibility. In these mice, 8 weeks of dox exposure was sufficient to induce the formation of ubiquitin-positive intranuclear inclusions, which also stain positive for the RAN translation product FMRpolyG. Formation of these inclusions is reversible after stopping expression of the expanded CGG RNA at an early developmental stage. Furthermore, we observed a deficit in the compensatory eye movements of mice with inclusions, a functional phenotype that could be reduced by stopping expression of the expanded CGG RNA early in the disease development. Taken together, this study shows, for the first time, the potential of disease reversibility and suggests that early intervention might be beneficial for FXTAS patients.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Hukema RK,Buijsen RA,Schonewille M,Raske C,Severijnen LA,Nieuwenhuizen-Bakker I,Verhagen RF,van Dessel L,Maas A,Charlet-Berguerand N,De Zeeuw CI,Hagerman PJ,Berman RF,Willemsen R

doi

10.1093/hmg/ddv216

subject

Has Abstract

pub_date

2015-09-01 00:00:00

pages

4948-57

issue

17

eissn

0964-6906

issn

1460-2083

pii

ddv216

journal_volume

24

pub_type

杂志文章

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