title: Remapping of the RP15 locus for X-linked cone-rod degeneration to Xp11.4-p21.1, and identification of a de novo insertion in the RPGR exon ORF15.
abstract: X-linked forms of retinitis pigmentosa (XLRP) are among the most severe, because of their early onset, often leading to significant vision loss before the 4th decade. Previously, the RP15 locus was assigned to Xp22, by linkage analysis of a single pedigree with "X-linked dominant cone-rod degeneration." After clinical reevaluation of a female in this pedigree identified her as affected, we remapped the disease to a 19.5-cM interval (DXS1219-DXS993) at Xp11.4-p21.1. This new interval overlapped both RP3 (RPGR) and COD1. Sequencing of the previously published exons of RPGR revealed no mutations, but a de novo insertion was detected in the new RPGR exon, ORF15. The identification of an RPGR mutation in a family with a severe form of cone and rod degeneration suggests that RPGR mutations may encompass a broader phenotypic spectrum than has previously been recognized in "typical" retinitis pigmentosa.
authors.affiliation: Department of Ophthalmology and Visual Sciences, W. K. Kellogg Eye Center, University of Michigan, Ann Arbor, MI 48105, USA.
authors.forename: A J
authors.initials: AJ
authors.lastname: Mears
authors.forename: S
authors.initials: S
authors.lastname: Hiriyanna
authors.forename: R
authors.initials: R
authors.lastname: Vervoort
authors.forename: B
authors.initials: B
authors.lastname: Yashar
authors.forename: L
authors.initials: L
authors.lastname: Gieser
authors.forename: S
authors.initials: S
authors.lastname: Fahrner
authors.forename: S P
authors.initials: SP
authors.lastname: Daiger
authors.forename: J R
authors.initials: JR
authors.lastname: Heckenlively
authors.forename: P A
authors.initials: PA
authors.lastname: Sieving
authors.forename: A F
authors.initials: AF
authors.lastname: Wright
authors.forename: A
authors.initials: A
authors.lastname: Swaroop
mesh_terms: D000328:Adult; D000595:Amino Acid Sequence; D001483:Base Sequence; D002874:Chromosome Mapping; D005091:Exons / Q000235:genetics*; D005260:Female; D008040:Genetic Linkage / Q000235:genetics*; D006239:Haplotypes / Q000235:genetics; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics*; D016366:Open Reading Frames / Q000235:genetics*; D010375:Pedigree; D010641:Phenotype; D011995:Recombination, Genetic / Q000235:genetics; D012174:Retinitis Pigmentosa / Q000235:genetics*; D014960:X Chromosome / Q000235:genetics*