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