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. 2002 Dec;86(12):1359-62.
doi: 10.1136/bjo.86.12.1359.

Identification of FBN1 gene mutations in patients with ectopia lentis and marfanoid habitus

P Comeglio  1 , A L Evans, G Brice, R J Cooling, A H Child
Affiliations

Identification of FBN1 gene mutations in patients with ectopia lentis and marfanoid habitus

P Comeglio et al. Br J Ophthalmol. 2002 Dec.

Abstract

Background: Marfan syndrome (MFS), inherited as an autosomal dominant trait, typically affects the cardiovascular, skeletal, and ocular systems. Ectopia lentis (EL) is a clinical manifestation of MFS, with stretching or disruption of the lenticular zonular filaments, leading to displacement of the lenses. EL, with or without minor skeletal changes, exists as an independent autosomal dominant phenotype linked to the same FBN1 locus.

Methods: A consecutive series of 11 patients, affected predominantly by EL, was analysed for FBN1 mutations using PCR, SSCA, and sequencing.

Results: Six mutations were identified, of which three are novel and one is recurrent in two patients, thus establishing a mutation incidence in this group of 7/11 (63%).

Conclusion: The FBN1 variants reported are clustered in the first 15 exons of the gene, while FBN1 mutations reported in the literature are distributed throughout the entire length of the gene. A different type of FBN1 mutation presents in this group of patients, compared with MFS, with arginine to cysteine substitutions appearing frequently.

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Figures

Figure 1
Figure 1
Schematic representation of the FBN1 mutations distribution. At the top are the FBN1 mutations reported in the Marfan database, while at the bottom are indicated the mutations identified in this study. The first 15 exons of the gene, encoding for the N-terminal domains of the fibrillin-1 protein, are highlighted in dark grey, with the others represented in light grey. The exons are numbered from 1 to 65.
See this image and copyright information in PMC

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