Dataset Information

Heterozygous variants in MGP lead to endoplasmic reticulum stress causing spondyloepiphyseal dysplasia

ABSTRACT: Matrix Gla protein (MGP) is a vitamin K-dependent post-translationally modified protein, highly expressed in vascular and cartilaginous tissues. It is a potent inhibitor of extracellular matrix mineralization. Biallelic loss of function variants in the MGP gene cause Keutel syndrome, an autosomal recessive disorder characterized by widespread calcification of various cartilaginous tissues and skeletal and vascular anomalies. In this study, we report four individuals from two unrelated families with two heterozygous variants in MGP, both altering the Cysteine 19 residue to phenylalanine or tyrosine. These individuals presented with a spondyloepiphyseal skeletal dysplasia characterized by short stature with a short trunk, diffuse platyspondyly, midface retrusion, progressive epiphyseal anomalies and brachytelephalangism. We investigated the cellular and molecular effects of one of the heterozygous deleterious variants (C19F) using both cell and genetically modified mouse models. Heterozygous ‘knock-in’ mice expressing C19F MGP recapitulated most of the skeletal anomalies observed in the affected individuals. We demonstrated that the main underlying mechanism leading to the observed skeletal dysplasia is endoplasmic reticulum stress-induced apoptosis of the growth plate chondrocytes. Our findings support that heterozygous variants in MGP altering Cys19 residue cause autosomal dominant spondyloepiphyseal dysplasia, a condition distinct from Keutel syndrome both clinically and molecularly.

INSTRUMENT(S): Orbitrap Fusion

ORGANISM(S): Mus Musculus (mouse)

SUBMITTER: Sultanah Alshahrani

LAB HEAD: Monzur Murshed

PROVIDER: PXD043374 | Pride | 2024-01-26

REPOSITORIES: Pride

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Specific heterozygous variants in MGP lead to endoplasmic reticulum stress and cause spondyloepiphyseal dysplasia.

Gourgas Ophélie O Lemire Gabrielle G Eaton Alison J AJ Alshahrani Sultanah S Duker Angela L AL Li Jingjing J Carroll Ricki S RS Mackenzie Stuart S Nikkel Sarah M SM Bober Michael B MB Boycott Kym M KM Murshed Monzur M

Nature communications 20231103 1

Matrix Gla protein (MGP) is a vitamin K-dependent post-translationally modified protein, highly expressed in vascular and cartilaginous tissues. It is a potent inhibitor of extracellular matrix mineralization. Biallelic loss-of-function variants in the MGP gene cause Keutel syndrome, an autosomal recessive disorder characterized by widespread calcification of various cartilaginous tissues and skeletal and vascular anomalies. In this study, we report four individuals from two unrelated families w ...[more]

PMID: 37923733

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			Action	DRS
	1.mgf	Mgf
	1.mgf.export.F006271.dat	Mgf
	1.raw	Raw
	2.mgf	Mgf
	2.mgf.export.F006272.dat	Mgf