LETTER TO JMG

Dominant X linked retinitis pigmentosa is frequently accounted for by truncating mutations in exon ORF15 of the RPGR gene

J-M Rozet¹, I Perrault¹, N Gigarel¹, E Souied¹, I Ghazi², S Gerber¹, J-L Dufier², A Munnich¹, J Kaplan¹

¹ Unité de Recherches sur les Handicaps Génétiques de l'Enfant, INSERM U393, Hôpital des Enfants Malades, 149 rue de Sévres, 75743 Paris Cedex 15, France
² Service d'Ophtalmologie, Hôpital Necker, 149 rue de Sévres, 75743 Paris Cedex 15, France

Correspondence to:
Correspondence to:
Dr J Kaplan, Unité de Recherches sur les Handicaps Génétiques de l'Enfant, INSERM U393, Hôpital des Enfants Malades, 149 rue de Sévres, 75743 Paris Cedex 15, France;
Kaplan@necker.fr

Keywords: retinitis pigmentosa; RPGR gene

Retinitis pigmentosa (RP) is a group of progressive hereditary disorders of the retina in which various modes of inheritance have been described. The X linked forms of retinitis pigmentosa (XLRP, MIM 268000) are among the most severe owing to their early onset, leading to significant vision loss before the fourth decade. Five XLRP loci have been localised by linkage: RP2 (MIM 312600), RP3 (MIM 312610), RP6 (MIM 312612), RP23,¹ and RP24 (MIM 300155). The major loci, RP2 and RP3, map to Xp11.4 and Xp21.1, respectively. RP3 is accounted for by mutations in the retinitis pigmentosa GTPase regulator (RPGR) gene.² RP3 accounts for 70% of XLRP,^{3, 4} but until recently only 20% of mutations were identified in RP3 families, suggesting genetic heterogeneity at this locus. This hypothesis has been excluded by the discovery of a mutational hot spot in a new RPGR exon, ORF15.⁵

In 1997, we reported on X . . . [Full text of this article]

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