" /> Niemann-pick disease, type a - CISMeF





Preferred Label : Niemann-pick disease, type a;

Type : Phenotype, molecular basis known;

Alternative titles and symbols : Sphingomyelin lipidosis; Sphingomyelinase deficiency; Asmd, neurovisceral type; Acid sphingomyelinase deficiency, neurovisceral type;

Included titles and symbols : Niemann-pick disease, intermediate, protracted neurovisceral;

Description : Niemann-Pick disease types A and B are caused by an inherited deficiency of acid sphingomyelinase activity. The clinical phenotype ranges from a severe infantile form with neurologic degeneration resulting in death usually by 3 years of age (type A) to a later-onset nonneurologic form (type B) that is compatible with survival into adulthood. Since intermediate cases also have been reported, the disease is best regarded a single entity with a clinical spectrum (summary by Schuchman, 2007). Knudson and Kaplan (1962) suggested that 3 types of the disorder can be distinguished: infantile cerebral, juvenile cerebral, and noncerebral. Later, 5 forms of Niemann-Pick disease were distinguished. Four were delineated by Crocker (1961): the classical infantile form (type A), the visceral form (type B), the subacute or juvenile form (type C; 257220), and the Nova Scotian variant (type D; see 257220). The fifth, the adult form (type E; see 607616), was described by Terry et al. (1954) and Lynn and Terry (1964). Schneider et al. (1978) used the designation type F (see 607616) for a form characterized in 2 patients by a thermolabile enzyme. Most patients fall into Crocker's group A, with death before age 3 years. Schuchman (2007) provided a detailed review of Niemann-Pick disease type A, including clinical management.;

Inheritance : Autosomal recessive;

Molecular basis : Caused by mutations in the acid lysosomal sphingomyelin phosphodiesterase-1 gene (SMPD1, 607608.0001);

Laboratory abnormalities : Decreased acid sphingomyelinase activity (less than 5%); Multiple organs (lung, liver, spleen, kidney, brain) contain foamy resident cells and histiocytes; Electron microscopy of foam cells shows lamellar inclusions;

Prefixed ID : #257200;

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19/05/2024


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