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Novel mutations in the arylsulfatase A gene in eight Italian families with metachromatic leukodystrophy.

Research paper by M M Bertelli, S S Gallo, A A Buda, S S Cecchin, A A Fabbri, C C Lapucci, G G Andrighetto, V V Sidoti, L L Lorusso, M M Pandolfo

Indexed on: 09 May '06Published on: 09 May '06Published in: Journal of Clinical Neuroscience



Abstract

Metachromatic leukodystrophy (MLD) is an autosomal recessive lysosomal storage disease caused by arylsulfatase A (ARSA) deficiency. We analysed the ARSA gene in eight unrelated Italian families with different clinical variants of MLD and identified three novel mutations: two Ser406Gly, (Glu329Ter) associated with late infantile MLD and one (Leu52Pro) with juvenile MLD. Only one family carried a pseudodeficiency allele (Asn350Ser). The IVS2+1G>A mutation occurred in four families. We also identified three polymorphisms, all in heterozygosis: Thr391Ser was present in five families, Trp193Cys in four families, and Ala210Ala in one family. We could identify 100% of the alleles causing MLD in the families, involving 12 different mutations, resulting in improved prognosis and genetic counselling.