Abstract:
BACKGROUND:Congenital muscular dystrophies (CMD) with reduced glycosylation of alpha-dystroglycan (alpha-DG) are a heterogeneous group of conditions associated with mutations in six genes encoding proven or putative glycosyltransferases. OBJECTIVES:The aim of the study was to establish the prevalence of mutations in the six genes in the Italian population and the spectrum of clinical and brain MRI findings. METHODS:As part of a multicentric study involving all the tertiary neuromuscular centers in Italy, FKRP, POMT1, POMT2, POMGnT1, fukutin, and LARGE were screened in 81 patients with CMD and alpha-DG reduction on muscle biopsy (n = 76) or with a phenotype suggestive of alpha-dystroglycanopathy but in whom a muscle biopsy was not available for alpha-DG immunostaining (n = 5). RESULTS:Homozygous and compound heterozygous mutations were detected in a total of 43/81 patients (53%), and included seven novel variants. Mutations in POMT1 were the most prevalent in our cohort (21%), followed by POMT2 (11%), POMGnT1 (10%), and FKRP (9%). One patient carried two heterozygous mutations in fukutin and one case harbored a new homozygous variant in LARGE. No clear-cut genotype-phenotype correlation could be observed with each gene, resulting in a wide spectrum of clinical phenotypes. The more severe phenotypes, however, appeared to be consistently associated with mutations predicted to result in a severe disruption of the respective genes. CONCLUSIONS:Our data broaden the clinical spectrum associated with mutations in glycosyltransferases and provide data on their prevalence in the Italian population.
journal_name
Neurologyjournal_title
Neurologyauthors
Mercuri E,Messina S,Bruno C,Mora M,Pegoraro E,Comi GP,D'Amico A,Aiello C,Biancheri R,Berardinelli A,Boffi P,Cassandrini D,Laverda A,Moggio M,Morandi L,Moroni I,Pane M,Pezzani R,Pichiecchio A,Pini A,Minetti C,Mondoi
10.1212/01.wnl.0000346518.68110.60subject
Has Abstractpub_date
2009-05-26 00:00:00pages
1802-9issue
21eissn
0028-3878issn
1526-632Xpii
01.wnl.0000346518.68110.60journal_volume
72pub_type
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