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;
Origin ID : 257200;
UMLS CUI : C0268242;
Automatic exact mappings (from CISMeF team)
Currated CISMeF NLP mapping
DO Cross reference
Genes related to phenotype
HPO term(s)
ORDO concept(s)
Semantic type(s)
UMLS correspondences (same concept)
Validated automatic mappings to NTBT