NCIt definition : An autosomal recessive condition caused by mutation(s) in the POLR3B gene, encoding
DNA-directed RNA polymerase III subunit RPC2. It is characterized by early onset cerebellar
ataxia and mild intellectual disability. Diffuse cerebral hypomyelination and cerebellar
atrophy are apparent on MRI. Hypogonadotropic hypogonadism and hypodontia are also
features of this condition.;