The pathogenesis and treatment of acid sphingomyelinase‐deficient Niemann–Pick disease

Journal of Inherited Metabolic Disease - 2007
Edward H. Schuchman1,2
1[email protected]
2Department of Genetics and Genomic Sciences, Mount Sinai School of Medicine, 1425 Madison Avenue, Room 14-20A, New York, NY, 10029 USA

Tóm tắt

SummaryPatients with types A and B Niemann–Pick disease (NPD) have an inherited deficiency of acid sphingomyelinase (ASM) activity. The clinical spectrum of this disorder ranges from the infantile, neurological form that results in death by 3 years of age (type A NPD) to the non‐neurological form (type B NPD) that is compatible with survival into adulthood. Intermediate cases also have been reported, and the disease is best thought of as a single entity with a spectrum of phenotypes. ASM deficiency is panethnic, but appears to be more frequent in individuals of Middle Eastern and North African descent. Current estimates of the disease incidence range from ~0.5 to 1 per 100 000 births. However, these approximations likely under estimate the true frequency of the disorder since they are based solely on cases referred to biochemical testing laboratories for enzymatic confirmation. The gene encoding ASM (SMPD1) has been studied extensively; it resides within an imprinted region on chromosome 11, and is preferentially expressed from the maternal chromosome. Over 100 SMPD1 mutations causing ASM‐deficient NPD have been described, and some useful genotype–phenotype correlations have been made. Based on these findings, DNA‐based carrier screening has been implemented in the Ashkenazi Jewish community. ASM ‘knockout’ mouse models also have been constructed and used to investigate disease pathogenesis and treatment. Based on these studies in the mouse model, an enzyme replacement therapy clinical trial has recently begun in adult patients with non‐neurological ASM‐deficient NPD.

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Journal of Inherited Metabolic Disease

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