X-linked dominant cone-rod degeneration: linkage mapping of a new locus for retinitis pigmentosa (RP 15) to Xp22.13-p22.11.

Abstract:

:Retinitis pigmentosa is the name given to a heterogeneous group of hereditary retinal degenerations characterized by progressive visual field loss, pigmentary changes of the retina, abnormal electroretinograms, and, frequently, night blindness. In this study, we investigated a family with dominant cone-rod degeneration, a variant form of retinitis pigmentosa. We used microsatellite markers to test for linkage to the disease locus and excluded all mapped autosomal loci. However, a marker from the short arm of the X chromosome, DXS989, showed 0% recombination to the disease locus, with a maximum lod (log-odds) score of 3.3. On the basis of this marker, the odds favoring X-linked dominant versus autosomal dominant inheritance are > 10(5):1. Haplotype analysis using an additional nine microsatellite markers places the disease locus in the Xp22.13-p22.11 region and excludes other X-linked disease loci causing retinal degeneration. The clinical expression of the retinal degeneration is consistent with X-linked dominant inheritance with milder, variable effects of Lyonization affecting expression in females. On the basis of these data we propose that this family has a novel form of dominant, X-linked cone-rod degeneration with the gene symbol "RP15."

journal_name

Am J Hum Genet

authors

McGuire RE,Sullivan LS,Blanton SH,Church MW,Heckenlively JR,Daiger SP

subject

Has Abstract

pub_date

1995-07-01 00:00:00

pages

87-94

issue

1

eissn

0002-9297

issn

1537-6605

journal_volume

57

pub_type

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