Journal Article

Mitotic Recombination in Patients with Ichthyosis Causes Reversion of Dominant Mutations in KRT10

Crumrine, Debra, Choi, Murim, Elias, Peter M, Milstone, Leonard M, Nopper, Amy J, Lifton, Richard P, Bree, Alanna, Farhi, Anita, Zhou, Jing, Williams, Mary L, Choate, Keith A, Lu, Yin, Nelson-Williams, Carol

2010

Overview

Somatic loss of wild-type alleles can produce disease traits such as neoplasia. Conversely, somatic loss of disease-causing mutations can revert phenotypes; however, these events are infrequently observed. Here we show that ichthyosis with confetti, a severe, sporadic skin disease in humans, is associated with thousands of revertant clones of normal skin that arise from loss of heterozygosity on chromosome 17q via mitotic recombination. This allowed us to map and identify disease-causing mutations in the gene encoding keratin 10 (KRT10); all result in frameshifts into the same alternative reading frame, producing an arginine-rich C-terminal peptide that redirects keratin 10 from the cytokeratin filament network to the nucleolus. The high frequency of somatic reversion in ichthyosis with confetti suggests that revertant stem cell clones are under strong positive selection and/or that the rate of mitotic recombination is elevated in individuals with this disorder.

• Publisher: American Association for the Advancement of Science,The American Association for the Advancement of Science
• Subject: alleles / Amino Acid Sequence / Cell division / cell nucleolus / Cell Nucleolus - metabolism / Chromosome Mapping / chromosomes / Chromosomes, Human, Pair 17 - genetics / clones / Disorders / Elevated / Female / Frameshift Mutation / Genes / Genetic mutation / Genetic recombination / Genomics / Genotypes / heterozygosity / High frequencies / Human / Humans / Ichthyosiform Erythroderma, Congenital - genetics / Ichthyosiform Erythroderma, Congenital - pathology / Ichthyosis / Intermediate Filaments - metabolism / Intermediate Filaments - ultrastructure / keratin / Keratin-10 - chemistry / Keratin-10 - genetics / Keratin-10 - metabolism / Keratinocytes / Keratins / Keratins - metabolism / Loss of Heterozygosity / Male / Mitosis / Mitotic recombination / Molecular Sequence Data / Mosaicism / Mutant Proteins - chemistry / Mutant Proteins - genetics / Mutant Proteins - metabolism / Mutation / Mutations / neoplasms / nucleotide sequences / patients / phenotype / Recombination, Genetic / Reversion / Selection, Genetic / Skin / Skin - pathology / Skin diseases / Stem cells