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• W2103153979 abstract "Cystinosis is an inherited disorder characterized by defective lysosomal efflux of cystine. Three clinical forms (infantile, juvenile and ocular cystinosis) have been described according to the age of onset and severity of the symptoms. The causative gene, CTNS, encodes a seven transmembrane domain protein, cystinosin, which we recently identified as a H+-driven cystine transporter using an in vitro transport assay. In this study, we explored the relationship between transport activity and intracellular localization of cystinosin mutants and their associated clinical phenotype. Thirty-one pathogenic mutations (24 missense mutations, seven in-frame deletions or insertions) were analysed. Most of the mutations did not alter the lysosomal localization of cystinosin, although three partially mislocalized the protein independently of its C-terminal sorting motif, thus confirming the presence of an additional sorting mechanism. Sixteen of 19 mutations associated with infantile cystinosis abolished transport, whereas three of five mutations associated with juvenile or ocular forms strongly reduced transport, in agreement with the milder clinical phenotype. Five atypical, unclassified or misclassified mutations could be clarified using the transport data and additional genetic information. Overall, our data demonstrate that, excluding premature termination of cystinosin, impaired transport is the most frequent cause of pathogenicity, with infantile cystinosis generally resulting from a total loss of activity. Thus the transport assay could be used as a prognostic tool when novel mutations are identified." @default.
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• W2103153979 date "2004-05-11" @default.
• W2103153979 modified "2023-10-10" @default.
• W2103153979 title "Molecular pathogenesis of cystinosis: effect of CTNS mutations on the transport activity and subcellular localization of cystinosin" @default.
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• W2103153979 doi "https://doi.org/10.1093/hmg/ddh152" @default.
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