Association of CRX genotypes and retinal phenotypes confounded by variable expressivity and electronegative electroretinogram

Koji M. Nishiguchi, Hiroshi Kunikata, Kosuke Fujita, Kazuki Hashimoto, Yoshito Koyanagi, Masato Akiyama, Yasuhiro Ikeda, Yukihide Momozawa, Koh Hei Sonoda, Akira Murakami, Yuko Wada, Toru Nakazawa

Research output: Contribution to journalArticle

Abstract

Importance: A framework for understanding the phenotypic features of CRX retinopathy was established. Background: To perform a phenotype-genotype correlation analysis in two groups of patients with heterozygous mutations in distinct locations of the CRX gene, encoding the cone-rod homeobox. Design: Multicentre retrospective study. Participants: Twenty-one Japanese patients from 14 families with a heterozygous CRX mutation. Methods: Retrospective data analysis. Main Outcome Measures: Clinical records on CRX mutation, symptoms, best-corrected visual acuity (BCVA), visual field, fundus photography, fundus auto-fluorescence, optical coherence tomography and electroretinograms (ERGs). Results: Six different CRX heterozygous mutations were identified in the subjects. Twelve patients from 9 families shared the p.R41W mutation and 1 patient had the p.R43C mutation, both of which affect the homeobox domain of CRX. These patients often displayed adult-onset retinal dystrophy with macular degeneration. In contrast, five patients with downstream mutations (p.S204fs, p.S213fs, p.G243X and p.L299F) displayed retinal degeneration or macular degeneration with bone-spicule pigmentation. Three asymptomatic carriers with different mutations (p.R41W, p.S213fs and p.G243X) were present in both groups. Nearly all patients and carriers had an electronegative ERG in response to a bright flash under dark adaptation. There was no cross-sectional association between patients' age and BCVA, despite progressive decline in BCVA. Conclusions and Relevance: Heterozygous mutations within or downstream of the homeobox domain in CRX relate to the difference associated retinal phenotypes, which was confounded by variable expressivity and electronegative ERGs. CRX mutations should be considered in patients with an electronegative ERG with minimal or no macular changes.

Original languageEnglish
JournalClinical and Experimental Ophthalmology
DOIs
Publication statusAccepted/In press - Jan 1 2020

All Science Journal Classification (ASJC) codes

  • Ophthalmology

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    Nishiguchi, K. M., Kunikata, H., Fujita, K., Hashimoto, K., Koyanagi, Y., Akiyama, M., Ikeda, Y., Momozawa, Y., Sonoda, K. H., Murakami, A., Wada, Y., & Nakazawa, T. (Accepted/In press). Association of CRX genotypes and retinal phenotypes confounded by variable expressivity and electronegative electroretinogram. Clinical and Experimental Ophthalmology. https://doi.org/10.1111/ceo.13743