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  • Title: Phenotype of an X-linked retinitis pigmentosa family with a novel splice defect in the RPGR gene.
    Author: Bauer S, Fujita R, Buraczynska M, Abrahamson M, Ehinger B, Wu W, Falls TJ, Andréasson S, Swaroop A.
    Journal: Invest Ophthalmol Vis Sci; 1998 Nov; 39(12):2470-4. PubMed ID: 9804156.
    Abstract:
    PURPOSE: To assess the clinical phenotype in a Swedish family with X-linked retinitis pigmentosa (XLRP) resulting from a novel splice defect in the RPGR gene. METHODS: RPGR mutation analysis was performed in one family with XLRP, and several individuals from the family were examined clinically. RESULTS: The causative mutation in the family was demonstrated to be a single base-pair change at the splice donor site in intron 7 that resulted in skipping of the complete exon 7 in the mature RPGR transcript. The aberrant mRNA is predicted to produce an RPGR protein with an in-frame deletion of 53 amino acids, corresponding to an RCC1-homology repeat. Clinical studies that included ophthalmological examination and full-field electroretinography showed that this splice mutation resulted in a comparatively less severe form of RP. CONCLUSIONS: Correlation of a causative RPGR genotype with clinical findings in hemizygotes and carrier heterozygotes is an important step toward predictive diagnosis and should assist in the development of gene-based therapies in the future.
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