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Missense mutations in β-1,3-N-acetylglucosaminyltransferase 1 (B3GNT1) cause Walker-Warburg syndrome.

Abstract：

:Several known or putative glycosyltransferases are required for the synthesis of laminin-binding glycans on alpha-dystroglycan (αDG), including POMT1, POMT2, POMGnT1, LARGE, Fukutin, FKRP, ISPD and GTDC2. Mutations in these glycosyltransferase genes result in defective αDG glycosylation and reduced ligand binding by αDG causing a clinically heterogeneous group of congenital muscular dystrophies, commonly referred to as dystroglycanopathies. The most severe clinical form, Walker-Warburg syndrome (WWS), is characterized by congenital muscular dystrophy and severe neurological and ophthalmological defects. Here, we report two homozygous missense mutations in the β-1,3-N-acetylglucosaminyltransferase 1 (B3GNT1) gene in a family affected with WWS. Functional studies confirmed the pathogenicity of the mutations. First, expression of wild-type but not mutant B3GNT1 in human prostate cancer (PC3) cells led to increased levels of αDG glycosylation. Second, morpholino knockdown of the zebrafish b3gnt1 orthologue caused characteristic muscular defects and reduced αDG glycosylation. These functional studies identify an important role of B3GNT1 in the synthesis of the uncharacterized laminin-binding glycan of αDG and implicate B3GNT1 as a novel causative gene for WWS.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Buysse K,Riemersma M,Powell G,van Reeuwijk J,Chitayat D,Roscioli T,Kamsteeg EJ,van den Elzen C,van Beusekom E,Blaser S,Babul-Hirji R,Halliday W,Wright GJ,Stemple DL,Lin YY,Lefeber DJ,van Bokhoven H

doi

10.1093/hmg/ddt021

subject

Has Abstract

pub_date

2013-05-01 00:00:00

pages

1746-54

issue

9

eissn

0964-6906

issn

1460-2083

pii

ddt021

journal_volume

22

pub_type

杂志文章

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