Mondo Description A rare form of spinal muscular atrophy characterized by the neonatal onset of severe hypotonia, areflexia, profound weakness, multiple congenital contractures, facial dysmorphic features (myopathic face with open, tent-shaped mouth), cryptorchidism, and mild skeletal abnormalities (i.e. kyphosis, scoliosis), that is often preceded by polyhydramnios and reduced fetal movements in utero and followed by bone fractures shortly after birth. SMAX2 patients often have a limited life span, often succumbing to the disease within 2 years, as muscle weakness is progressive and chest muscle involvement eventually leads to ventilatory insufficiency and respiratory failure.
Uniprot Description A lethal infantile form of spinal muscular atrophy, a neuromuscular disorder characterized by degeneration of the anterior horn cells of the spinal cord, leading to symmetrical muscle weakness and atrophy. Clinical features include hypotonia, areflexia, and multiple congenital contractures.
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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 UniProt.
DataSources which have contributed target associations to this disease, and the identifiers by which the disease is referenced.
GARD:0008521
MESH:C535380
OMIM:301830
Orphanet:1145
SCTID:719836007
UMLS:C1844934
MONDO:0010532
High level summary of knowledge for a disease, including descriptions and datasource references.