PURPOSE: To describe the clinical and genetic characteristics of six Japanese families with Bietti's crystalline corneoretinal dystrophy (BCD). DESIGN: Case reports and results of DNA analysis. METHODS: Mutation screening was performed on six unrelated patients with BCD by direct sequencing. The clinical features were characterized by the visual acuity, slit-lamp biomicroscopy, electroretinography, fluorescein angiography, and kinetic visual field testing. RESULTS: An identical IVS6 to 8delTCATACAGGTCATCGCG/insGC mutation in the CYP4V2 gene was identified in five of the patients with BCD; the sixth patient had a novel Trp340X mutation in the CYP4V2 gene. Three patients showed crystalline-like deposits at the limbus by specular microscopy. Ophthalmic findings of all patients had a rapid progression after age 50 years. CONCLUSIONS: Our findings suggest that the IVS6 to 8delTCATACAGGTCATCGCG/insGC mutation is a common mutation in Japanese patients with BCD. Although phenotypic variability was found, the natural course was almost the same in all of our patients.
PURPOSE: To describe the clinical and genetic characteristics of six Japanese families with Bietti's crystalline corneoretinal dystrophy (BCD). DESIGN: Case reports and results of DNA analysis. METHODS: Mutation screening was performed on six unrelated patients with BCD by direct sequencing. The clinical features were characterized by the visual acuity, slit-lamp biomicroscopy, electroretinography, fluorescein angiography, and kinetic visual field testing. RESULTS: An identical IVS6 to 8delTCATACAGGTCATCGCG/insGC mutation in the CYP4V2 gene was identified in five of the patients with BCD; the sixth patient had a novel Trp340X mutation in the CYP4V2 gene. Three patients showed crystalline-like deposits at the limbus by specular microscopy. Ophthalmic findings of all patients had a rapid progression after age 50 years. CONCLUSIONS: Our findings suggest that the IVS6 to 8delTCATACAGGTCATCGCG/insGC mutation is a common mutation in Japanese patients with BCD. Although phenotypic variability was found, the natural course was almost the same in all of our patients.
Authors: Feng Wang; Hui Wang; Han-Fang Tuan; Duy H Nguyen; Vincent Sun; Vafa Keser; Sara J Bowne; Lori S Sullivan; Hongrong Luo; Ling Zhao; Xia Wang; Jacques E Zaneveld; Jason S Salvo; Sorath Siddiqui; Louise Mao; Dianna K Wheaton; David G Birch; Kari E Branham; John R Heckenlively; Cindy Wen; Ken Flagg; Henry Ferreyra; Jacqueline Pei; Ayesha Khan; Huanan Ren; Keqing Wang; Irma Lopez; Raheel Qamar; Juan C Zenteno; Raul Ayala-Ramirez; Beatriz Buentello-Volante; Qing Fu; David A Simpson; Yumei Li; Ruifang Sui; Giuliana Silvestri; Stephen P Daiger; Robert K Koenekoop; Kang Zhang; Rui Chen Journal: Hum Genet Date: 2013-10-24 Impact factor: 4.132