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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

doi: 10.1097/ICO.0b013e31828a27bc
Clinical Science

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.

*Department of Ophthalmology, University General Hospital of Alicante, Alicante, Spain;

Laboratory of Human Molecular Genetics, School of Medicine/Research Institute on Neurological Disabilities (IDINE), University of Castilla La-Mancha, Albacete, Spain; and

Cooperative Research Network on Age-Related Ocular Pathology, Visual and Life Quality, Health Institute Carlos III, Madrid, Spain.

Reprints: Gerardo-Pedro García García, Department of Ophthalmology, University General Hospital of Alicante, Maestro Alonso St 109, 03010 Alicante, Spain (e-mail:

The authors have no funding or conflicts of interest to disclose.

Received September 18, 2011

Accepted January 27, 2013

Copyright © 2013 Wolters Kluwer Health, Inc. All rights reserved.