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Invest Ophthalmol Vis Sci. 2010 Nov;51(11):5943-51. doi: 10.1167/iovs.10-5797. Epub 2010 Jun 16.

Homozygosity mapping in patients with cone-rod dystrophy: novel mutations and clinical characterizations.

Author information

1
The Rotterdam Eye Hospital, Rotterdam, The Netherlands.

Abstract

PURPOSE:

To determine the genetic defect and to describe the clinical characteristics in a cohort of mainly nonconsanguineous cone-rod dystrophy (CRD) patients.

METHODS:

One hundred thirty-nine patients with diagnosed CRD were recruited. Ninety of them were screened for known mutations in ABCA4, and those carrying one or two mutations were excluded from further research. Genome-wide homozygosity mapping was performed in the remaining 108. Known genes associated with autosomal recessive retinal dystrophies located within a homozygous region were screened for mutations. Patients in whom a mutation was detected underwent further ophthalmic examination.

RESULTS:

Homozygous sequence variants were identified in eight CRD families, six of which were nonconsanguineous. The variants were detected in the following six genes: ABCA4, CABP4, CERKL, EYS, KCNV2, and PROM1. Patients carrying mutations in ABCA4, CERKL, and PROM1 had typical CRD symptoms, but a variety of retinal appearances on funduscopy, optical coherence tomography, and autofluorescence imaging.

CONCLUSIONS:

Homozygosity mapping led to the identification of new mutations in consanguineous and nonconsanguineous patients with retinal dystrophy. Detailed clinical characterization revealed a variety of retinal appearances, ranging from nearly normal to extensive retinal remodeling, retinal thinning, and debris accumulation. Although CRD was initially diagnosed in all patients, the molecular findings led to a reappraisal of the diagnosis in patients carrying mutations in EYS, CABP4, and KCNV2.

PMID:
20554613
PMCID:
PMC3061516
DOI:
10.1167/iovs.10-5797
[Indexed for MEDLINE]
Free PMC Article

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