A hypervariable DNA marker is closely linked to one of the most severe forms of night blindness, X-linked retinitis pigmentosa (RP). Affected individuals with X-linked RP, obligate carriers, and ophthalmologically identifiable carriers of the disease were included in a linkage study. The diagnosis was established in five sibships by funduscopic and electrophysiological investigations. When the X-linked probe M27β was used, 2 recombinants out of 29 informative meioses were detected (θ=0.07 at a maximum lod of 4.75). The hypervariable probe detected two different alleles in 38 of 39 females tested. M27β is therefore a potentially very useful probe for carrier detection and prenatal diagnosis, as well as for addressing the question of heterogeneity of X-linked RP.
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Meitinger, T., Fraser, N.A., Lorenz, B. et al. Linkage of X-linked retinitis pigmentosa to the hypervariable DNA marker M27β (DXS255). Hum Genet 81, 283–286 (1989). https://doi.org/10.1007/BF00279005
- Internal Medicine
- Metabolic Disease
- Severe Form
- Prenatal Diagnosis