title: Multipoint linkage analysis and heterogeneity testing in 20 X-linked retinitis pigmentosa families.
abstract: Using multipoint linkage analysis in 20 families segregating for X-linked retinitis pigmentosa (XLRP), the lod scores on a map of eight RFLP loci were obtained. Our results indicate that under the hypothesis of homogeneity the maximal multipoint lod score supports one disease locus located slightly distal to OTC at Xp21.1. Heterogeneity testing for two XLRP loci suggested that a second XLRP locus may be located 8.5 cM proximal to DXS28 at Xp21.3. Further heterogeneity testing for three disease loci failed to detect a third XLRP locus proximal to DXS7 in any of our 20 XLRP families.
authors.affiliation: Department of Ophthalmology, University of Toronto, Hospital for Sick Children, Ontario, Canada.
authors.forename: M A
authors.initials: MA
authors.lastname: Musarella
authors.forename: L
authors.initials: L
authors.lastname: Anson-Cartwright
authors.forename: S M
authors.initials: SM
authors.lastname: Leal
authors.forename: L D
authors.initials: LD
authors.lastname: Gilbert
authors.forename: R G
authors.initials: RG
authors.lastname: Worton
authors.forename: G A
authors.initials: GA
authors.lastname: Fishman
authors.forename: J
authors.initials: J
authors.lastname: Ott
mesh_terms: D000483:Alleles; D002874:Chromosome Mapping; D005260:Female; D005819:Genetic Markers; D006801:Humans; D008126:Lod Score; D008297:Male; D010375:Pedigree; D012150:Polymorphism, Restriction Fragment Length; D012174:Retinitis Pigmentosa / Q000235:genetics*; D014960:X Chromosome
chemical_list: D005819:Genetic Markers