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Spinal muscular atrophy associated with progressive myoclonic epilepsy is caused by mutations in ASAH1.

Abstract：

:Spinal muscular atrophy (SMA) is a clinically and genetically heterogeneous disease characterized by the degeneration of lower motor neurons. The most frequent form is linked to mutations in SMN1. Childhood SMA associated with progressive myoclonic epilepsy (SMA-PME) has been reported as a rare autosomal-recessive condition unlinked to mutations in SMN1. Through linkage analysis, homozygosity mapping, and exome sequencing in three unrelated SMA-PME-affected families, we identified a homozygous missense mutation (c.125C>T [p.Thr42Met]) in exon 2 of ASAH1 in the affected children of two families and the same mutation associated with a deletion of the whole gene in the third family. Expression studies of the c.125C>T mutant cDNA in Farber fibroblasts showed that acid-ceramidase activity was only 32% of that generated by normal cDNA. This reduced activity was able to normalize the ceramide level in Farber cells, raising the question of the pathogenic mechanism underlying the CNS involvement in deficient cells. Morpholino knockdown of the ASAH1 ortholog in zebrafish led to a marked loss of motor-neuron axonal branching, a loss that is associated with increased apoptosis in the spinal cord. Our results reveal a wide phenotypic spectrum associated with ASAH1 mutations. An acid-ceramidase activity below 10% results in Farber disease, an early-onset disease starting with subcutaneous lipogranulomata, joint pain, and hoarseness of the voice, whereas a higher residual activity might be responsible for SMA-PME, a later-onset phenotype restricted to the CNS and starting with lower-motor-neuron disease.

journal_name

Am J Hum Genet

journal_title

American journal of human genetics

authors

Zhou J,Tawk M,Tiziano FD,Veillet J,Bayes M,Nolent F,Garcia V,Servidei S,Bertini E,Castro-Giner F,Renda Y,Carpentier S,Andrieu-Abadie N,Gut I,Levade T,Topaloglu H,Melki J

doi

10.1016/j.ajhg.2012.05.001

subject

Has Abstract

pub_date

2012-07-13 00:00:00

pages

5-14

issue

1

eissn

0002-9297

issn

1537-6605

pii

S0002-9297(12)00255-8

journal_volume

91

pub_type

杂志文章

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