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Pre-natal manifestation of systemic developmental abnormalities in spinal muscular atrophy.

Abstract：

:Spinal muscular atrophy (SMA) is a neuromuscular disease caused by mutations in survival motor neuron 1 (SMN1). SMN-restoring therapies have recently emerged; however, preclinical and clinical studies revealed a limited therapeutic time window and systemic aspects of the disease. This raises a fundamental question of whether SMA has presymptomatic, developmental components to disease pathogenesis. We have addressed this by combining micro-computed tomography (μCT) and comparative proteomics to examine systemic pre-symptomatic changes in a prenatal mouse model of SMA. Quantitative μCT analyses revealed that SMA embryos were significantly smaller than littermate controls, indicative of general developmental delay. More specifically, cardiac ventricles were smaller in SMA hearts, whilst liver and brain remained unaffected. In order to explore the molecular consequences of SMN depletion during development, we generated comprehensive, high-resolution, proteomic profiles of neuronal and non-neuronal organs in SMA mouse embryos. Significant molecular perturbations were observed in all organs examined, highlighting tissue-specific prenatal molecular phenotypes in SMA. Together, our data demonstrate considerable systemic changes at an early, presymptomatic stage in SMA mice, revealing a significant developmental component to SMA pathogenesis.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Motyl AAL,Faller KME,Groen EJN,Kline RA,Eaton SL,Ledahawsky LM,Chaytow H,Lamont DJ,Wishart TM,Huang YT,Gillingwater TH

doi

10.1093/hmg/ddaa146

subject

Has Abstract

pub_date

2020-09-29 00:00:00

pages

2674-2683

issue

16

eissn

0964-6906

issn

1460-2083

pii

5869328

journal_volume

29

pub_type

杂志文章

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