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Brain. 2013 May;136(Pt 5):1508-17. doi: 10.1093/brain/awt074. Epub 2013 Mar 29.

Limb-girdle muscular dystrophy 1F is caused by a microdeletion in the transportin 3 gene.

Author information

1
Research Group on Neuromuscular and Mitochondrial Disorders, Vall d'Hebron Institut de Recerca, VHIR, Universitat Autònoma de Barcelona, Passeig Vall d'Hebron, 119-129 08035 Barcelona, Spain.

Abstract

In 2001, we reported linkage of an autosomal dominant form of limb-girdle muscular dystrophy, limb-girdle muscular dystrophy 1F, to chromosome 7q32.1-32.2, but the identity of the mutant gene was elusive. Here, using a whole genome sequencing strategy, we identified the causative mutation of limb-girdle muscular dystrophy 1F, a heterozygous single nucleotide deletion (c.2771del) in the termination codon of transportin 3 (TNPO3). This gene is situated within the chromosomal region linked to the disease and encodes a nuclear membrane protein belonging to the importin beta family. TNPO3 transports serine/arginine-rich proteins into the nucleus, and has been identified as a key factor in the HIV-import process into the nucleus. The mutation is predicted to generate a 15-amino acid extension of the C-terminus of the protein, segregates with the clinical phenotype, and is absent in genomic sequence databases and a set of >200 control alleles. In skeletal muscle of affected individuals, expression of the mutant messenger RNA and histological abnormalities of nuclei and TNPO3 indicate altered TNPO3 function. Our results demonstrate that the TNPO3 mutation is the cause of limb-girdle muscular dystrophy 1F, expand our knowledge of the molecular basis of muscular dystrophies and bolster the importance of defects of nuclear envelope proteins as causes of inherited myopathies.

PMID:
23543484
PMCID:
PMC3634201
DOI:
10.1093/brain/awt074
[Indexed for MEDLINE]
Free PMC Article

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