Pathogenic TFG Mutations Underlying Hereditary Spastic Paraplegia Impair Secretory Protein Trafficking and Axon Fasciculation

作者: Erin L. Slosarek , Amber L. Schuh , Iryna Pustova , Adam Johnson , Jennifer Bird

DOI: 10.1016/J.CELREP.2018.07.081

关键词:

摘要: Length-dependent axonopathy of the corticospinal tract causes lower limb spasticity and is characteristic several neurological disorders, including hereditary spastic paraplegia (HSP) amyotrophic lateral sclerosis. Mutations in Trk-fused gene (TFG) have been implicated both diseases, but pathomechanisms by which these alterations cause neuropathy remain unclear. Here, we biochemically genetically define impact a mutation within TFG coiled-coil domain, underlies early-onset forms HSP. We find that (p.R106C) alters compaction ring complexes, which play critical role export cargoes from endoplasmic reticulum (ER). Using CRISPR-mediated genome editing, engineered human stem cells express mutant form at endogenous levels identified specific defects secretion ER axon fasciculation following neuronal differentiation. Together, our data highlight key for TFG-mediated protein transport pathogenesis

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