MedGen

Intellectual developmental disorder with language impairment and early-onset dopa-responsive dystonia-parkinsonism (IDLDP) is a neurodevelopmental disorder characterized by global developmental delay affecting motor, cognitive, and speech domains apparent in early childhood or infancy. Some patients may have normal early development in infancy before symptom onset. There is phenotypic heterogeneity and the severity is highly variable; less severely affected individuals have only mild deficits and are able to attend special schools. About half of patients develop various types of seizures that may be refractory or responsive to treatment. Most patients also show movement abnormalities, often hypotonia early in the disease course with later development of dopa-responsive dystonia or parkinsonism (Ramos et al., 2019, Wirth et al., 2020; Singh et al., 2020). [from OMIM]

Gaucher disease (GD) encompasses a continuum of clinical findings from a perinatal-lethal disorder to an asymptomatic type. The characterization of three major clinical types (1, 2, and 3) and two clinical forms (perinatal-lethal and cardiovascular) is useful in determining prognosis and management. Cardiopulmonary complications have been described with all the clinical phenotypes, although varying in frequency and severity. Type 1 GD is characterized by the presence of clinical or radiographic evidence of bone disease (osteopenia, focal lytic or sclerotic lesions, and osteonecrosis), hepatosplenomegaly, anemia, thrombocytopenia, lung disease, and the absence of primary central nervous system disease. Type 2 GD is characterized by primary central nervous system disease with onset before age two years, limited psychomotor development, and a rapidly progressive course with death by age two to four years. Type 3 GD is characterized by primary central nervous system disease with childhood onset, a more slowly progressive course, and survival into the third or fourth decade. The perinatal-lethal form is associated with ichthyosiform or collodion skin abnormalities or with nonimmune hydrops fetalis. The cardiovascular form is characterized by calcification of the aortic and mitral valves, mild splenomegaly, corneal opacities, and supranuclear ophthalmoplegia. [from GeneReviews]