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Translation of Expanded CGG Repeats into FMRpolyG Is Pathogenic and May Contribute to Fragile X Tremor Ataxia Syndrome

Abstract : Fragile X-associated tremor/ataxia syndrome (FXTAS) is a neurodegenerative disorder caused by a limited expansion of CGG repeats in the 5' UTR of FMR1. Two mechanisms are proposed to cause FXTAS: RNA gain-of-function, where CGG RNA sequesters specific proteins, and translation of CGG repeats into a polyglycine-containing protein, FMRpolyG. Here we developed transgenic mice expressing CGG repeat RNA with or without FMRpolyG. Expression of FMRpolyG is pathogenic, while the sole expression of CGG RNA is not. FMRpolyG interacts with the nuclear lamina protein LAP2β and disorganizes the nuclear lamina architecture in neurons differentiated from FXTAS iPS cells. Finally, expression of LAP2β rescues neuronal death induced by FMRpolyG. Overall, these results suggest that translation of expanded CGG repeats into FMRpolyG alters nuclear lamina architecture and drives pathogenesis in FXTAS.
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https://www.hal.inserm.fr/inserm-03375211
Contributor : Stéphane Dieterle Connect in order to contact the contributor
Submitted on : Tuesday, October 12, 2021 - 3:55:16 PM
Last modification on : Friday, October 15, 2021 - 3:38:57 AM

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Chantal Sellier, Ronald Buijsen, Fang He, Sam Natla, Laura Jung, et al.. Translation of Expanded CGG Repeats into FMRpolyG Is Pathogenic and May Contribute to Fragile X Tremor Ataxia Syndrome. Neuron, Elsevier, 2017, 93 (2), pp.331-347. ⟨10.1016/j.neuron.2016.12.016⟩. ⟨inserm-03375211⟩

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