Pathological impact of SMN2 mis-splicing in adult SMA mice.

Abstract:

:Loss-of-function mutations in SMN1 cause spinal muscular atrophy (SMA), a leading genetic cause of infant mortality. The related SMN2 gene expresses suboptimal levels of functional SMN protein, due to a splicing defect. Many SMA patients reach adulthood, and there is also adult-onset (type IV) SMA. There is currently no animal model for adult-onset SMA, and the tissue-specific pathogenesis of post-developmental SMN deficiency remains elusive. Here, we use an antisense oligonucleotide (ASO) to exacerbate SMN2 mis-splicing. Intracerebroventricular ASO injection in adult SMN2-transgenic mice phenocopies key aspects of adult-onset SMA, including delayed-onset motor dysfunction and relevant histopathological features. SMN2 mis-splicing increases during late-stage disease, likely accelerating disease progression. Systemic ASO injection in adult mice causes peripheral SMN2 mis-splicing and affects prognosis, eliciting marked liver and heart pathologies, with decreased IGF1 levels. ASO dose-response and time-course studies suggest that only moderate SMN levels are required in the adult central nervous system, and treatment with a splicing-correcting ASO shows a broad therapeutic time window. We describe distinctive pathological features of adult-onset and early-onset SMA.

journal_name

EMBO Mol Med

journal_title

EMBO molecular medicine

authors

Sahashi K,Ling KK,Hua Y,Wilkinson JE,Nomakuchi T,Rigo F,Hung G,Xu D,Jiang YP,Lin RZ,Ko CP,Bennett CF,Krainer AR

doi

10.1002/emmm.201302567

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

1586-601

issue

10

eissn

1757-4676

issn

1757-4684

journal_volume

5

pub_type

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