Mondo Description Spinal muscular atrophy (SMA) refers to a group of inherited conditions that affect the muscles. The severity of the condition; the associated signs and symptoms; and the age at which symptoms develop varies by subtype. In general, people with SMA experience progressive weakness and atrophy of muscles involved in mobility, the ability to sit unassisted, and head control. Breathing and swallowing may also be affected in severe cases. SMA is generally caused by changes (mutations) in the SMN1 gene and is inherited in an autosomal recessive manner. Extra copies of the SMN2 gene modify the severity of SMA. Rare autosomal dominant (caused by mutations in DYNC1H1, BICD2, or VAPB genes) and X-linked (caused by mutations in UBA1) forms of SMA exist. Treatment is based on the signs and symptoms present in each person.
Disease Ontology Description A motor neuron disease that is a degenerative neuromuscular disease characterized by lower motor neuron degeneration associated with progressive muscle weakness and atrophy.
Counts of Target Development Levels for diseases known to be associated with this disease. If the disease has a valid DOID, targets known to be associated with all child diseases are aggregated. Click "Explore Associated Targets" to view more facets and details for the target list.
This disease has been annotated by GARD as a rare disease.
Description from Mondo Disease Ontology.
Description from Disease Ontology
DataSources which have contributed target associations to this disease, and the identifiers by which the disease is referenced.
COHD:372605
DOID:12377
EFO:0008525
GARD:0007674
ICD9:335.10
MESH:D009134
NCIT:C85075
SCTID:5262007
UMLS:C0026847
MONDO:0001516
High level summary of knowledge for a disease, including descriptions and datasource references.