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A rare genetic leukodystrophy disorder with characteristics of diffuse hypomyelination in the supratentorial brain white matter, brain stem and spinal cord. Patients usually present nystagmus, lower limb spasticity, hypotonia and motor developmental delay as well as MRI signal abnormalities involving the corpus callosum, anterior brainstem, pyramidal tracts, superior and inferior cerebellar peduncles, dorsal columns and/or lateral corticospinal tracts. Caused by homozygous or compound heterozygous mutation in the DARS gene on chromosome 2q21.
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