Skip Navigation LinksHome > July 2013 - Volume 32 - Issue 7 > Genotype–Phenotype Analysis of Bietti Crystalline Dystrophy...
doi: 10.1097/ICO.0b013e31828a27bc
Clinical Science

Genotype–Phenotype Analysis of Bietti Crystalline Dystrophy in a Family with the CYP4V2 Ile111Thr Mutation

García-García, Gerardo-Pedro MD*; López-Garrido, María-Pilar PhD†,‡; Martínez-Rubio, Magdalena MD*; Moya-Moya, Medina-Azahara MD*; Belmonte-Martínez, José MD, PhD*; Escribano, Julio PhD†,‡

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Purpose: The purposes of this study were to evaluate the genotypic and phenotypic correlations of Bietti crystalline dystrophy and to investigate the utility of in vivo corneal confocal microscopy in diagnosing this disorder.

Methods: A Spanish woman (proband) with a clinical diagnosis of Bietti crystalline dystrophy and 7 members of her family were recruited prospectively for complete clinical ophthalmic examination and genetic study. The medical records of an additional family member were reviewed retrospectively. Genomic DNA was obtained from blood samples, and 11 exons of the CYP4V2 gene were screened for mutations by polymerase chain reaction DNA sequencing.

Results: Clinical examination revealed an atypical pattern of corneal dystrophy with central and paracentral distribution not only in the proband but also in 2 elderly heterozygous carriers. Corneal deposits were observed by slit-lamp examination and in vivo corneal confocal microscopy. Genetic analysis revealed the homozygous CYP4V2 Ile111Thr mutation in the proband and identified 5 heterozygous carriers.

Conclusions: The authors identified a case of Bietti crystalline dystrophy with central and paracentral keratopathy and the molecular analysis of the causative gene in a Spanish family. Data suggest a dose-dependent phenotype ranging from subclinical corneal changes in subjects carrying 1 mutant Ile111Thr CYP4V2 allele to the complete manifestation of the disease in homozygous subjects. In vivo corneal confocal microscopy is a useful technique in the diagnosis of this disorder.

© 2013 by Lippincott Williams & Wilkins.


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