Abstract

We recently described a distinct form of autosomal recessive LGMD with microcephaly, mild mental retardation and significantly reduced glycosyation of the α-dystroglycan in skeletal muscle. In a subgroup of these patients, this phenotype results from a common mutation in (A200P) in the O-mannosyltransferase (POMT1) gene. We clinically evaluated 15 patients, between ages 4 and 20, from 15 families with limb-girdle muscular dystrophy, mild microcephaly and mental retardation. The common finding in their muscle biopsies was severe reduction of the glycosylated part of α-dystroglycan in the immunohistochemistry.

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