No pathogenic mutations identified in the TGFBI gene in polymorphic corneal amyloid deposition.
Cornea
; 25(4): 413-5, 2006 May.
Article
em En
| MEDLINE
| ID: mdl-16670477
ABSTRACT
PURPOSE:
To determine whether primary, polymorphic, corneal amyloid deposition is associated with a mutation of the TGFBI gene.METHODS:
Interventional case series of 8 patients. Slit lamp examination of all patients and photodocumentation of 5 patients were performed. Genomic DNA was isolated from buccal mucosal swabs obtained from all patients and all 17 exons of the TGFBI gene were amplified and sequenced.RESULTS:
Multiple polymorphic, refractile deposits were noted throughout the central corneal stroma in all patients. The deposits appeared gray-white on direct illumination and translucent on retroillumination, characteristic of amyloid. In 2 patients, linear, branching opacities, reminiscent of lattice corneal dystrophy, were identified. Histopathologic examination confirmed the presence of stromal amyloid in the cornea of 1 patient who required corneal transplantation for pseudophakic corneal edema. Screening of the entire coding region of the TGFBI gene revealed 4 previously described synonymous substitutions, Leu217Leu, Val327Val, Leu472Leu, and Phe540Phe. A previously unreported missense change, Asp299Asn, was identified in one affected patient but not in her affected sister. No pathogenic mutations, including the Ala546Asp missense mutation previously associated with polymorphic corneal amyloidosis, were identified in any of the patients.CONCLUSIONS:
TGFBI gene mutations were not identified in a series of patients with polymorphic corneal amyloid deposition. As bilateral, discrete stromal amyloid deposits may be dystrophic or degenerative, differentiation between these phenotypically similar conditions is facilitated with the use of molecular genetic analysis.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas da Matriz Extracelular
/
Fator de Crescimento Transformador beta
/
Doenças da Córnea
/
Substância Própria
/
Amiloidose Familiar
/
Amiloide
/
Mutação
Tipo de estudo:
Prognostic_studies
Limite:
Aged
/
Aged80
/
Female
/
Humans
/
Middle aged
Idioma:
En
Revista:
Cornea
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Estados Unidos