Linkage analysis of a large Latin-American family with X-linked retinitis pigmentosa and metallic sheen in the heterozygote carrier

An extended linkage analysis was performed on the large Latin-American kindred with X-linked retinitis pigmentosa (XLRP) and metallic sheen in the heterozygous carrier studied and reported previously by R. L. Nussbaum et al. (1985, Hum. Genet. 70: 45–50) and on a smaller family with the same XLRP variant. In these kindreds the XLRP locus shows close linkage with Xp21 marker loci OTC and DXS206. The results of this linkage analysis agree with the observations made by Nussbaum et al. (1985) that an XLRP locus is distal to DXS7.