Expanding the phenotype associated with FOXG1 mutations and in vivo FoxG1 chromatin-binding dynamics.
Clin Genet
; 82(4): 395-403, 2012 Oct.
Article
em En
| MEDLINE
| ID: mdl-22091895
ABSTRACT
Mutations in the Forkhead box G1 (FOXG1) gene, a brain specific transcriptional factor, are responsible for the congenital variant of Rett syndrome. Until now FOXG1 point mutations have been reported in 12 Rett patients. Recently seven additional patients have been reported with a quite homogeneous severe phenotype designated as the FOXG1 syndrome. Here we describe two unrelated patients with a de novo FOXG1 point mutation, p.Gln46X and p.Tyr400X, respectively, having a milder phenotype and sharing a distinctive facial appearance. Although FoxG1 action depends critically on its binding to chromatin, very little is known about the dynamics of this process. Using fluorescence recovery after photobleaching, we showed that most of the GFP-FoxG1 fusion protein associates reversibly to chromatin whereas the remaining fraction is bound irreversibly. Furthermore, we showed that the two pathologic derivatives of FoxG1 described in this paper present a dramatic alteration in chromatin affinity and irreversibly bound fraction in comparison with Ser323fsX325 mutant (associated with a severe phenotype) and wild type Foxg1 protein. Our observations suggest that alterations in the kinetics of FoxG1 binding to chromatin might contribute to the pathological effects of FOXG1 mutations.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fenótipo
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Cromossomos Humanos Par 15
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Cromatina
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Fatores de Transcrição Forkhead
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Doenças Genéticas Inatas
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Proteínas do Tecido Nervoso
Tipo de estudo:
Risk_factors_studies
Limite:
Adult
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Child
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Female
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Humans
Idioma:
En
Revista:
Clin Genet
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Itália