TUBB5 and its disease-associated mutations influence the terminal differentiation and dendritic spine densities of cerebral cortical neurons.
Hum Mol Genet
; 23(19): 5147-58, 2014 Oct 01.
Article
em En
| MEDLINE
| ID: mdl-24833723
ABSTRACT
The microtubule cytoskeleton is critical for the generation and maturation of neurons in the developing mammalian nervous system. We have previously shown that mutations in the ß-tubulin gene TUBB5 cause microcephaly with structural brain abnormalities in humans. While it is known that TUBB5 is necessary for the proper generation and migration of neurons, little is understood of the role it plays in neuronal differentiation and connectivity. Here, we report that perturbations to TUBB5 disrupt the morphology of cortical neurons, their neuronal complexity, axonal outgrowth, as well as the density and shape of dendritic spines in the postnatal murine cortex. The features we describe are consistent with defects in synaptic signaling. Cellular-based assays have revealed that TUBB5 substitutions have the capacity to alter the dynamic properties and polymerization rates of the microtubule cytoskeleton. Together, our studies show that TUBB5 is essential for neuronal differentiation and dendritic spine formation in vivo, providing insight into the underlying cellular pathology associated with TUBB5 disease states.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Tubulina (Proteína)
/
Diferenciação Celular
/
Córtex Cerebral
/
Espinhas Dendríticas
/
Mutação
/
Neurônios
Tipo de estudo:
Risk_factors_studies
Limite:
Animals
Idioma:
En
Revista:
Hum Mol Genet
Assunto da revista:
BIOLOGIA MOLECULAR
/
GENETICA MEDICA
Ano de publicação:
2014
Tipo de documento:
Article
País de afiliação:
Austrália