RGD uses the Human Disease Ontology (DO, https://disease-ontology.org/) for disease curation across species. RGD automatically downloads each new release of the ontology on a monthly basis. Some additional terms which are required for RGD's curation purposes but are not currently covered in the official version of DO have been added. As corresponding terms are added to DO, these custom terms are retired and the DO terms substituted in existing annotations and subsequently used for curation.
A childhood spinal muscular atrophy that is characterized by progressive muscular weakness and respiratory failure, develops in children between the ages of 6 and 12 months and drastically reduces length of life, and has_material_basis_in mutations in the SMN1 or SMN2 genes that are required for the survival of motor neurons. (DO)
Synonyms:
exact_synonym:
SMA II; SMA2; spinal muscular atrophy 2; spinal muscular atrophy, infantile chronic form; spinal muscular atrophy, intermediate type; spinal muscular atrophy, type 2; spinal muscular atrophy, type II