Journal
NEUROLOGY-GENETICS
Volume 8, Issue 2, Pages -Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1212/NXG.0000000000000661
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This study reports a novel association between pathogenic variants in the SEPSECS gene and complex movement disorder with thin corpus callosum. Clinical exome sequencing revealed two missense variants. The case represents an early-onset pyramidal syndrome with optic nerve hypoplasia that slowly evolved into extrapyramidal syndrome featuring dystonia-parkinsonism, associated with thin corpus callosum.
Objectives To report a novel association between pathogenic variants in the SEPSECS gene and complex movement disorder with thin corpus callosum (TCC). Methods Clinical exome sequencing was performed in an adult patient with a genetically unsolved neurodegenerative disorder. The main clinical, neuroimaging, and genetic data were described. Results The c.865C > T (p.P289S) and c.1297T > C (p.Y433H) missense variants in SEPSECS (NM_016,955.3) were discovered. Discussion This case represents a novel form of early-onset pyramidal syndrome with optic nerve hypoplasia, which slowly evolved to extrapyramidal syndrome featuring dystonia-parkinsonism, associated with TCC, caused by SEPSECS pathogenic variants. This form enlarges the group of the so-called pyramidal-extrapyramidal syndromes, as well as complex hereditary spastic paraparesis with TCC.
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