Homozygous dystroglycan mutation associated with a novel muscle-eye-brain disease-like phenotype with multicystic leucodystrophy.
Defects in dystroglycan post-translational modification result in congenital muscular dystrophy with or without additional eye and brain involvement, are referred to as secondary dystroglycanopathies and have been associated with mutations in 11 different genes encoding glycosyltransferases or associated proteins. However, only one patient with a mutation in the dystroglycan encoding gene DAG1 itself has been described before. We here report a homozygous novel DAG1 missense mutation c.2006G>T predicted to result in the amino acid substitution p.Cys669Phe in the β-subunit of dystroglycan in two Libyan siblings. The affected girls presented with a severe muscle-eye-brain disease-like phenotype with distinct additional findings of macrocephaly and extended bilateral multicystic white matter disease, overlapping with the cerebral findings in patients with megalencephalic leucoencephalopathy with subcortical cysts. This novel clinical phenotype observed in our patients further expands the clinical spectrum of dystroglycanopathies and suggests a role of DAG1 not only for dystroglycanopathies but also for some forms of more extensive and multicystic leucodystrophy.
Department of Pediatric Neurology, Klinik St. Hedwig, University Children's Hospital Regensburg (KUNO), Steinmetzstr.1-3, 93049, Regensburg, Germany, tobias.geis@barmherzige-regensburg.de.
Tobias
T
Geis
Klaus
K
Marquard
Tanja
T
Rödl
Christof
C
Reihle
Sophie
S
Schirmer
Thekla
T
von Kalle
Antje
A
Bornemann
Ute
U
Hehr
Markus
M
Blankenburg
D019943:Amino Acid Substitution; D001369:Axons / Q000473:pathology; D001921:Brain / Q000473:pathology; D002675:Child, Preschool; D003560:Cysts / Q000235:genetics; D049030:Dystroglycans / Q000235:genetics*; D005260:Female; D008040:Genetic Linkage; D006720:Homozygote; D006801:Humans; D056784:Leukoencephalopathies / Q000175:diagnosis / Q000235:genetics* / Q000473:pathology*; D008002:Libya; D018482:Muscle, Skeletal / Q000473:pathology; D020125:Mutation, Missense; D010641:Phenotype; D058494:Walker-Warburg Syndrome / Q000175:diagnosis / Q000235:genetics* / Q000473:pathology*
C483081:DAG1 protein, human; D049030:Dystroglycans