Type : Phenotype or locus, molecular basis unknown;
Description : Spastic paraplegias (SPGs) are a genetically heterogeneous group of neurologic disorders
characterized by progressive weakness and spasticity of the legs. Complicated SPGs
are accompanied by additional neurologic symptoms such as cerebellar ataxia, sensory
loss, mental retardation, nystagmus, and optic atrophy (summary by Steinmuller et
al., 1997). A locus for spastic paraplegia-16 has been mapped to Xq11.2-q23 (Steinmuller
et al., 1997). For a discussion of genetic heterogeneity of X-linked spastic paraplegia,
see 303350.;