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.
Term:
NEURODEVELOPMENTAL DISORDER WITH MICROCEPHALY AND SPEECH DELAY, WITH OR WITHOUT BRAIN ABNORMALITIES
This disease is an autosomal recessive disorder characterized by global developmental delay, hypotonia, delayed or absent walking, impaired intellectual development, and poor or absent speech, apparent from early infancy. Patients have postnatal progressive microcephaly.