alexa Mutations in ISPD cause Walker-Warburg syndrome and defective glycosylation of α-dystroglycan.
Pediatrics

Pediatrics

Pediatrics & Therapeutics

Author(s): Roscioli T, Kamsteeg EJ, Buysse K, Maystadt I, van Reeuwijk J,

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Abstract Walker-Warburg syndrome (WWS) is an autosomal recessive multisystem disorder characterized by complex eye and brain abnormalities with congenital muscular dystrophy (CMD) and aberrant a-dystroglycan glycosylation. Here we report mutations in the ISPD gene (encoding isoprenoid synthase domain containing) as the second most common cause of WWS. Bacterial IspD is a nucleotidyl transferase belonging to a large glycosyltransferase family, but the role of the orthologous protein in chordates is obscure to date, as this phylum does not have the corresponding non-mevalonate isoprenoid biosynthesis pathway. Knockdown of ispd in zebrafish recapitulates the human WWS phenotype with hydrocephalus, reduced eye size, muscle degeneration and hypoglycosylated a-dystroglycan. These results implicate ISPD in a-dystroglycan glycosylation in maintaining sarcolemma integrity in vertebrates.
This article was published in Nat Genet and referenced in Pediatrics & Therapeutics

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