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X-Linked retinitis pigmentosa is a most severe and heterogeneous disorder of the retina. Recently, genes (RP2 and RPGR) from two X-linked loci have been positionally cloned and mutations have been identified in many families. To further evaluate allelic and non-allelic heterogeneity and the genotype--phenotype relationships, and to determine the prevalence of mutations in the gene, we have analyzed one previously unreported X-linked retinitis pigmentosa family, using a combination of haplotype analysis and DNA sequencing. Our extensive analysis of the RP2 gene failed to detect any disease--causing or polymorphic mutations. In the case of the RP3 gene, the alleles of the dinucleotide repeat marker did not segregate with the disease. Although we cannot completely exclude the possibility of the RP2 and RP3 genes as candidate genes, the above results suggest that structural and functional changes associated with the RP2 gene are not responsible for the phenotype in the family analyzed. Further identification of the X-linked genes may facilitate the elucidation of the molecular basis of the disorder in the family analyzed.

Evaluation of RP2 and RP3 genes in an X-linked RP family manifesting loss of central vision and preserved peripheral function