A new locus for dominant drusen and macular degeneration maps to chromosome 6q14.

Purpose: To report the localization of a gene causing drusen and macular degeneration in a previously undescribed North American family.

Methods: Genetic mapping studies were performed using linkage analysis in a single family with drusen and atrophic macular degeneration.

Results: The clinical manifestations in this family ranged from fine macular drusen in asymptomatic middle-aged individuals to atrophic macular lesions in two children and two elderly patients. We mapped the gene to chromosome 6q14 between markers D6S2258 and D6S1644.

Conclusions: In a family with autosomal dominant drusen and atrophic macular degeneration, the gene maps to a 3.2-cM region on chromosome 6q14. This locus appears to be distinct from, but adjacent to, the loci for cone-rod dystrophy 7 (CORD7) and North Carolina macular dystrophy (MCDR1). Future identification of the gene responsible for the disease in this family will provide a better understanding of macular degeneration.