Abstract:
:Walker-Warburg syndrome (WWS) is clinically defined as congenital muscular dystrophy that is accompanied by a variety of brain and eye malformations. It represents the most severe clinical phenotype in a spectrum of diseases associated with abnormal post-translational processing of a-dystroglycan that share a defect in laminin-binding glycan synthesis1. Although mutations in six genes have been identified as causes of WWS, only half of all individuals with the disease can currently be diagnosed on this basis2. A cell fusion complementation assay in fibroblasts from undiagnosed individuals with WWS was used to identify five new complementation groups. Further evaluation of one group by linkage analysis and targeted sequencing identified recessive mutations in the ISPD gene (encoding isoprenoid synthase domain containing). The pathogenicity of the identified ISPD mutations was shown by complementation of fibroblasts with wild-type ISPD. Finally, we show that recessive mutations in ISPD abolish the initial step in laminin-binding glycan synthesis by disrupting dystroglycan O-mannosylation. This establishes a new mechanism for WWS pathophysiology.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Willer T,Lee H,Lommel M,Yoshida-Moriguchi T,de Bernabe DB,Venzke D,Cirak S,Schachter H,Vajsar J,Voit T,Muntoni F,Loder AS,Dobyns WB,Winder TL,Strahl S,Mathews KD,Nelson SF,Moore SA,Campbell KPdoi
10.1038/ng.2252subject
Has Abstractpub_date
2012-05-01 00:00:00pages
575-80issue
5eissn
1061-4036issn
1546-1718pii
ng.2252journal_volume
44pub_type
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