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Genes (Basel). 2019 Nov 21;10(12). pii: E953. doi: 10.3390/genes10120953.

Clinical and Genetic Findings of Autosomal Recessive Bestrophinopathy (ARB).

Author information

1
IRO-Institute for Research in Ophthalmology, 1950 Sion, Switzerland.
2
Oculogenetic laboratory LR14SP01, Hedi Rais Institute of Ophthalmology (Department B), Tunis 1007, Tunisia.
3
Department of Ophthalmology, Cantonal Hospital St. Gallen, 9000 St. Gallen, Switzerland.
4
Department of Ophthalmology, University of Basel, 4000 Basel, Switzerland.
5
Eye Clinic, Lucerne Cantonal Hospital, 6000 Lucerne, Switzerland.
6
Jules Gonin Eye Hospital, 1004 Lausanne, Switzerland.
7
Department of Ophthalmology, University of Lausanne, 1004 Lausanne, Switzerland.
8
Faculty of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, 1004 Lausanne, Switzerland.

Abstract

Mutations in BEST1 cause several phenotypes including autosomal dominant (AD) Best vitelliform macular dystrophy type 2 (BVMD), AD vitreo-retino-choroidopathy (ADVIRC), and retinitis pigmentosa-50 (RP50). A rare subtype of Bestrophinopathy exists with biallelic mutations in BEST1. Its frequency is estimated to be 1/1,000,000 individuals. Here we report 6 families and searched for a genotype-phenotype correlation. All patients were referred due to reduced best-corrected visual acuity (BCVA), ranging from 0.1/10 to 3/10. They all showed vitelliform lesions located at the macula, sometimes extending into the midperiphery, along the vessels and the optic disc. Onset of the disease varied from the age of 3 to 25 years. Electrooculogram (EOG) revealed reduction in the EOG light rise in all patients. Molecular analysis revealed previously reported mutations p.(E35K);(E35K), p.(L31M);(L31M), p.(R141H);(A195V), p.(R202W);(R202W), and p.(Q220*);(Q220*) in five families. One family showed a novel mutation: p.(E167G);(E167G). All mutations were heterozygous in the parents. In one family, heterozygous children showed various reductions in the EOG light rise and autofluorescent deposits. Autosomal recessive Bestrophinopathy (ARB), although rare, can be recognized by its phenotype and should be validated by molecular analysis. Genotype-phenotype correlations are difficult to establish and will require the analysis of additional cases.

KEYWORDS:

ARB; BEST1; bestrophinopathy

PMID:
31766397
DOI:
10.3390/genes10120953
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Conflict of interest statement

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this article.

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