Further testing is recommended where spastin and atlastin both test negative.
The KIF5A gene should be routinely analyzed in patients with hereditary spastic paraplegia who test negative for spastin and atlastin mutations. This finding enlarges the phenotypic spectrum of ADHSP linked to KIF5A and enhances the role of that gene in the epidemiology of the disease.
BACKGROUND: To our knowledge, up to now, only 2 mutations in the KIF5A gene, a member of the kinesin superfamily, have been identified as the molecular cause of early-onset autosomal dominant hereditary spastic paraparesis (ADHSP).
OBJECTIVE: To assess the genetic defect in a family with late-onset ADHSP.
PATIENTS AND METHODS: Only the proband agreed to undergo complete neurological testing and mutational analysis. The proband was screened for mutations in the spastin, atlastin, NIPA1, and KIF5A genes.
RESULTS: The history of the family was consistent with ADHSP characterized by late onset of the disease. Mutational analysis results were negative for the spastin, atlastin, and NIPA1 genes but identified a missense mutation (c.1082C>T) in the coiled-coil coding region of the KIF5A gene.
Arch Neurol. 2006 Feb;63(2):284-7.
A missense mutation in the coiled-coil domain of the KIF5A gene and late-onset hereditary spastic paraplegia.
Lo Giudice M, Neri M, Falco M, Sturnio M, Calzolari E, Di Benedetto D, Fichera M.
Genetic Diagnostic Laboratory, Istituto di Ricovero e Cura a Carattere Scientifico Oasi Maria SS, Troina, Italy.