Unverricht-Lundborg disease: Homozygosity for a new splicing mutation in the cystatin B gene

Pinto, Eugenia; Freitas, Joel; Duarte, Ana Joana; Ribeiro, Isaura; Lima, JL; Chaves, Joao; Amaral, Olga

http://hdl.handle.net/10400.18/538

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Abstract(s)

Unverricht-Lundborg disease is the most common form of progressive myoclonic epilepsy (PME). It is due to cystatin B gene (CSTB) mutations. Several mutations in CSTB gene have been published, but few in homozygosity. We describe a patient with a new splicing alteration. Mutation Gln22Gln leads to abnormal splicing and partial inclusion of intronic sequence. This is one of the few cases of homozygosity for a non-classic mutation and adds to mutational heterogeneity of CSTB.