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PLoS Genet. 2014 May 1;10(5):e1004311. doi: 10.1371/journal.pgen.1004311. eCollection 2014 May.

The impairment of MAGMAS function in human is responsible for a severe skeletal dysplasia.

Author information

1
Unité de Génétique Médicale et Laboratoire International associé INSERM à l'Unité UMR_S 910, Faculté de Médecine, Université Saint-Joseph, Beirut, Lebanon; Département de Génétique, Unité INSERM U781, Université Paris Descartes-Sorbonne Paris Cité, Fondation Imagine, Hôpital Necker Enfants Malades, Paris, France.
2
University of Paris-Sud, CNRS, UMR 8621, Institute of Genetics and Microbiology, Orsay, France.
3
Département de Génétique, Unité INSERM U781, Université Paris Descartes-Sorbonne Paris Cité, Fondation Imagine, Hôpital Necker Enfants Malades, Paris, France.
4
Inserm, UMR_S 910, Marseille, France; Aix Marseille Université, GMGF, Marseille, France.
5
Center of Excellence in Neuroscience of Université de Montréal, Centre de Recherche du CHU Sainte-Justine, Montréal, Canada; Department of Obstetrics and Gynecology, Université de Montréal, Montréal, Canada.
6
Unité de Génétique Médicale et Laboratoire International associé INSERM à l'Unité UMR_S 910, Faculté de Médecine, Université Saint-Joseph, Beirut, Lebanon.

Abstract

Impairment of the tightly regulated ossification process leads to a wide range of skeletal dysplasias and deciphering their molecular bases has contributed to the understanding of this complex process. Here, we report a homozygous mutation in the mitochondria-associated granulocyte macrophage colony stimulating factor-signaling gene (MAGMAS) in a novel and severe spondylodysplastic dysplasia. MAGMAS, also referred to as PAM16 (presequence translocase-associated motor 16), is a mitochondria-associated protein involved in preprotein translocation into the matrix. We show that MAGMAS is specifically expressed in trabecular bone and cartilage at early developmental stages and that the mutation leads to an instability of the protein. We further demonstrate that the mutation described here confers to yeast strains a temperature-sensitive phenotype, impairs the import of mitochondrial matrix pre-proteins and induces cell death. The finding of deleterious MAGMAS mutations in an early lethal skeletal dysplasia supports a key role for this mitochondrial protein in the ossification process.

PMID:
24786642
PMCID:
PMC4006740
DOI:
10.1371/journal.pgen.1004311
[Indexed for MEDLINE]
Free PMC Article

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