Abstract:
:Muscle-eye-brain disease (MEB) and Walker Warburg Syndrome (WWS) belong to a spectrum of autosomal recessive diseases characterized by ocular dysgenesis, neuronal migration defects, and congenital muscular dystrophy. Until now, the pathophysiology of MEB/WWS has been attributed to alteration in dystroglycan post-translational modification. Here, we provide evidence that mutations in a gene coding for a major basement membrane protein, collagen IV alpha 1 (COL4A1), are a novel cause of MEB/WWS. Using a combination of histological, molecular, and biochemical approaches, we show that heterozygous Col4a1 mutant mice have ocular dysgenesis, neuronal localization defects, and myopathy characteristic of MEB/WWS. Importantly, we identified putative heterozygous mutations in COL4A1 in two MEB/WWS patients. Both mutations occur within conserved amino acids of the triple-helix-forming domain of the protein, and at least one mutation interferes with secretion of the mutant proteins, resulting instead in intracellular accumulation. Expression and posttranslational modification of dystroglycan is unaltered in Col4a1 mutant mice indicating that COL4A1 mutations represent a distinct pathogenic mechanism underlying MEB/WWS. These findings implicate a novel gene and a novel mechanism in the etiology of MEB/WWS and expand the clinical spectrum of COL4A1-associated disorders.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Labelle-Dumais C,Dilworth DJ,Harrington EP,de Leau M,Lyons D,Kabaeva Z,Manzini MC,Dobyns WB,Walsh CA,Michele DE,Gould DBdoi
10.1371/journal.pgen.1002062subject
Has Abstractpub_date
2011-05-01 00:00:00pages
e1002062issue
5eissn
1553-7390issn
1553-7404pii
PGENETICS-D-10-00087journal_volume
7pub_type
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