Dominant KPNA3 Mutations Cause Infantile-Onset Hereditary Spastic Paraplegia.
Ann Neurol
; 90(5): 738-750, 2021 11.
Article
en En
| MEDLINE
| ID: mdl-34564892
ABSTRACT
OBJECTIVE:
Hereditary spastic paraplegia (HSP) is a highly heterogeneous neurologic disorder characterized by lower-extremity spasticity. Here, we set out to determine the genetic basis of an autosomal dominant, pure, and infantile-onset form of HSP in a cohort of 8 patients with a uniform clinical presentation.METHODS:
Trio whole-exome sequencing was used in 5 index patients with infantile-onset pure HSP to determine the genetic cause of disease. The functional impact of identified genetic variants was verified using bioinformatics and complementary cellular and biochemical assays.RESULTS:
Distinct heterozygous KPNA3 missense variants were found to segregate with the clinical phenotype in 8 patients; in 4 of them KPNA3 variants had occurred de novo. Mutant karyopherin-α3 proteins exhibited a variable pattern of altered expression level, subcellular distribution, and protein interaction.INTERPRETATION:
Our genetic findings implicate heterozygous variants in KPNA3 as a novel cause for autosomal dominant, early-onset, and pure HSP. Mutant karyopherin-α3 proteins display varying deficits in molecular and cellular functions, thus, for the first time, implicating dysfunctional nucleocytoplasmic shuttling as a novel pathomechanism causing HSP. ANN NEUROL 2021;90738-750.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Paraplejía Espástica Hereditaria
/
Alfa Carioferinas
/
Mutación
Tipo de estudio:
Prognostic_studies
Límite:
Adult
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Child, preschool
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
Ann Neurol
Año:
2021
Tipo del documento:
Article
País de afiliación:
Alemania