Abstract
Lysosomal storage disorders (LSDs) are monogenic inborn errors of metabolism. Various groups have been delineated according to the affected pathway and the accumulated substrate, and new entities are still being identified. They are severe disorders with a heterogeneous clinical spectrum encompassing visceral, skeletal and neurologic involvement, and high morbidity and mortality. Most of the genes encoding the lysosomal enzymes have been cloned, and animal models have been obtained for almost each disease. In the last decades, LSDs have been models for the development of molecular and cellular therapies for inherited metabolic diseases. Studies in preclinical in vitro systems and animal models have allowed the successful development of bone marrow transplantation, substrate deprivation, enzyme replacement therapy and gene transfer methods as therapeutic options for several LSDs. The aim of this paper is to review the biology of acid hydrolases and lysosomal membrane proteins, to describe the systematic classification of LSDs and the most recently identified entities, and to briefly review novel therapeutic approaches for two lipidoses: Gaucher disease and Fabry disease.
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