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Loss-of-function mutations in the keratin 5 gene lead to Dowling-Degos disease.

Betz R.C., Planko L., Eigelshoven S., Hanneken S., Pasternack S.M., Buessow H., Bogaert K.V., Wenzel J., Braun-Falco M., Ruetten A., Rogers M.A., Ruzicka T., Noethen M.M., Magin T.M., Kruse R.

Dowling-Degos disease (DDD) is an autosomal dominant genodermatosis characterized by progressive and disfiguring reticulate hyperpigmentation of the flexures. We performed a genomewide linkage analysis of two German families and mapped DDD to chromosome 12q, with a total LOD score of 4.42 ( theta =0.0) for marker D12S368. This region includes the keratin gene cluster, which we screened for mutations. We identified loss-of-function mutations in the keratin 5 gene (KRT5) in all affected family members and in six unrelated patients with DDD. These represent the first identified mutations that lead to haploinsufficiency in a keratin gene. The identification of loss-of-function mutations, along with the results from additional functional studies, suggest a crucial role for keratins in the organization of cell adhesion, melanosome uptake, organelle transport, and nuclear anchorage.

Am. J. Hum. Genet. 78:510-519(2006) [PubMed] [Europe PMC]

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