Hereditary Spastic Paraplegia - paediatric

Gene: SOD1

Green List (high evidence)

Three individuals reported with biallelic LoF variants, with two apparently unrelated individuals having the same variant (c.335dupG).

Phenotypes include one individual with axial hypotonia and loss of gross and fine motor function beginning at 6 months of age, after which severe, progressive spastic tetraparesis developed and Babinski’s sign was present in both feet. MRI of brain detected mild frontoparietal atrophy.

The second individual had severe and marked by progressive loss of motor abilities from 9 months of age, tetraspasticity with predominance in the lower extremities, mild cerebellar atrophy, and hyperekplexia-like symptoms. Dysmorphic features such as low set, posteriorly rotated ears, and overlapping toes.

The third individual is an infant with severe global developmental delay, axial hypotonia and limb spasticity. No dysmorphic facial features were noted, but she had a high arched palate, bilateral 5th finger clinodactyly, partial toe syndactyly of the second and third toes, and a single hyperpigmented macule tongue fasciculations, axial hypotonia with limb spasticity (more pronounced in the lower limbs), ankle clonus, and brisk patellar deep tendon reflexes.
Sources: Literature

Created: 2 Feb 2022, 12:09 a.m.

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Spastic tetraplegia and axial hypotonia, progressive, MIM#618598

Publications

• PMID: 31314961
• 31332433
• 34788402