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Abstract
This group has previously reported the mapping of a novel locus for autosomal dominant retinitis pigmentosa (adRP) in a South African kindred to 17q. Using a new series of microsatellite markers in this study, twopoint and multipoint analysis provide evidence for the localization of the disease gene to the 17q22 region. In addition, a second South African adRP family is shown to be linked to this 17q22 locus. Disease-associated haplotypes constructed for both families and multipoint linkage analysis place the gene in the 10-cM interval between D17S1607 and D17S1874. Three candidate genes on 17q were investigated: PDEG, the gamma subunit of rod phosphodiesterase; TIMP2, tissue inhibitor of metalloproteinases-2; and PRKCA, protein kinase C alpha. Recombination events between the adRP locus and: (1) a single-stranded conformation polymorphism in PDEG; and (2) a restriction fragment length polymorphism in TIMP2 provided evidence for the exclusion of these candidate genes as being responsible for adRP in the South African kindred.
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