Phenotypic high myopia in X-linked retinitis pigmentosa secondary to a novel mutation in the RPGR gene

Retinitis pigmentosa (RP) is a clinically and genetically heterogeneous disease causing progressive degeneration of retinal photoreceptor cells. The most severe form of this disease is X-linked RP (XLRP), in which photoreceptor degeneration begins in early childhood and complete blindness often occu...

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Bibliographic Details
Published in:Ophthalmic genetics 2019-03, Vol.40 (2), p.170-176
Main Authors: Sanchez Tocino, Hortensia, Diez Montero, Cecilia, Villanueva Gómez, Ana, Lobo Valentin, Rosa, Montero-Moreno, Javier Antonio
Format: Article
Language:English
Subjects:
Adult
Aged
Child
DNA Mutational Analysis
Electroretinography
Exons - genetics
Eye Proteins - genetics
Female
Genetic Association Studies
Genetic Diseases, X-Linked - diagnosis
Genetic Diseases, X-Linked - genetics
Heterozygote
Humans
Male
Middle Aged
Mutation
Myopia, Degenerative - diagnosis
Myopia, Degenerative - genetics
Pedigree
Phenotype
Retinitis Pigmentosa - diagnosis
Retinitis Pigmentosa - genetics
Visual Field Tests
Visual Fields - physiology
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Summary:Retinitis pigmentosa (RP) is a clinically and genetically heterogeneous disease causing progressive degeneration of retinal photoreceptor cells. The most severe form of this disease is X-linked RP (XLRP), in which photoreceptor degeneration begins in early childhood and complete blindness often occurs by the fourth decade of life. Two genes commonly associated with XLRP have been previously identified. One Spanish family with confirmed XLRP was studied for mutations using direct sequencing. A genotype-phenotype correlation with pathologic myopia (PM) is detailed. A new pathogenic mutation in the third exon of the RP GTPase regulator (RPGR) was identified: a variant c212C>G (pSER71*). This mutation appears as a hemizygous variant in the male proband with RP, and as heterozygous variant in the females of this pedigree who invariably exhibit symmetrical PM in both eyes. A complete family history allowed determination of the inheritance pattern providing genetic counseling for patients and their families. The geno-phenotypic attributes of this heterozygosity suggest a correlation between RP and PM. This novel mutation would expand the mutation spectrum of RP2 and RPGR, and help to study molecular pathogenesis of RP.
ISSN:1381-6810
1744-5094
DOI:10.1080/13816810.2019.1605385