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ISPD gene mutations are a common cause of congenital and limb-girdle muscular dystrophies.

Cirak, Sebahattin and Foley, Aileen Reghan and Herrmann, Ralf and Willer, Tobias and Yau, Shu and Stevens, Elizabeth and Torelli, Silvia and Brodd, Lina and Kamynina, Alisa and Vondracek, Petr and Roper, Helen and Longman, Cheryl and Korinthenberg, Rudolf and Marrosu, Gianni and Nürnberg, Peter and Michele, Daniel E and Plagnol, Vincent and Hurles, Matt and Moore, Steven A and Sewry, Caroline A and Campbell, Kevin P and Voit, Thomas and Muntoni, Francesco (2013) ISPD gene mutations are a common cause of congenital and limb-girdle muscular dystrophies. Brain : a journal of neurology, 136 (Pt 1). pp. 269-81. ISSN 1460-2156. This article is accessible to all HEFT staff and students via NHS Evidence www.evidence.nhs.uk by using their HEFT Athens login IDs

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Abstract

Dystroglycanopathies are a clinically and genetically diverse group of recessively inherited conditions ranging from the most severe of the congenital muscular dystrophies, Walker-Warburg syndrome, to mild forms of adult-onset limb-girdle muscular dystrophy. Their hallmark is a reduction in the functional glycosylation of α-dystroglycan, which can be detected in muscle biopsies. An important part of this glycosylation is a unique O-mannosylation, essential for the interaction of α-dystroglycan with extracellular matrix proteins such as laminin-α2. Mutations in eight genes coding for proteins in the glycosylation pathway are responsible for ∼50% of dystroglycanopathy cases. Despite multiple efforts using traditional positional cloning, the causative genes for unsolved dystroglycanopathy cases have escaped discovery for several years. In a recent collaborative study, we discovered that loss-of-function recessive mutations in a novel gene, called isoprenoid synthase domain containing (ISPD), are a relatively common cause of Walker-Warburg syndrome. In this article, we report the involvement of the ISPD gene in milder dystroglycanopathy phenotypes ranging from congenital muscular dystrophy to limb-girdle muscular dystrophy and identified allelic ISPD variants in nine cases belonging to seven families. In two ambulant cases, there was evidence of structural brain involvement, whereas in seven, the clinical manifestation was restricted to a dystrophic skeletal muscle phenotype. Although the function of ISPD in mammals is not yet known, mutations in this gene clearly lead to a reduction in the functional glycosylation of α-dystroglycan, which not only causes the severe Walker-Warburg syndrome but is also a common cause of the milder forms of dystroglycanopathy.

Item Type: Article
Additional Information: This article is accessible to all HEFT staff and students via NHS Evidence www.evidence.nhs.uk by using their HEFT Athens login IDs
Subjects: WE Musculoskeletal. Orthopaedics
Divisions: Womens and Childrens > Paediatrics
Related URLs:
Depositing User: Sophie Rollason
Date Deposited: 11 Jun 2014 13:27
Last Modified: 11 Jun 2014 13:27
URI: http://www.repository.heartofengland.nhs.uk/id/eprint/242

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