Activating NOTCH3 mutation in a patient with small-vessel-disease of the brain.
Hum Mutat
; 29(3): 452, 2008 Mar.
Article
em En
| MEDLINE
| ID: mdl-18273901
ABSTRACT
The most common causative diagnosis of hereditary small-vessel-disease of the brain, CADASIL, is due to highly stereotyped mutations in the NOTCH3 receptor. NOTCH3 has 33 exons but all CADASIL mutations occur within the Epidermal Growth Factor-like Repeats encoded by exons 2-24, lead to an odd number of cysteine residues and are associated with GOM deposits and abnormal NOTCH3 protein accumulation. The majority of CADASIL mutations appear to retain normal level of signaling activity, while very few mutations show reduced activity. Herein we identified a novel heterozygous missense mutation (c.4544T>C) in exon 25 of NOTCH3 in a patient with cerebral small-vessel-disease but lacking GOM deposits and NOTCH3 accumulation. The mutation should result in a p.L1515P substitution in the evolutionarily highly conserved juxtamembranous region of NOTCH3, which constitutes the heterodimerization domain. The p.L1515P mutant exhibits increased canonical NOTCH3 signaling, although in a ligand-independent fashion. Biochemical analysis suggests that the mutation renders NOTCH3 hyperactive through destabilization of the heterodimer. Therefore, our study suggests that the p.L1515P mutation falls in a novel mechanistic class of NOTCH3 mutations and that NOTCH3 activating mutations should be further considered for molecular analysis of patients with cerebral small-vessel-disease.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Mutação de Sentido Incorreto
/
CADASIL
/
Receptores Notch
Tipo de estudo:
Prognostic_studies
Limite:
Animals
/
Female
/
Humans
/
Middle aged
Idioma:
En
Revista:
Hum Mutat
Assunto da revista:
GENETICA MEDICA
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
França