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Closing the gap on autosomal dominant connexin-26 and connexin-43 mutants linked to human disease Laird DWJ Biol Chem 2008[Feb]; 283 (6): 2997-3001Cells within the vast majority of human tissues communicate directly through clustered arrays of intercellular channels called gap junctions. Gene ablation studies in mouse models have revealed that these intercellular channels are necessary for a variety of organ functions and that some of these genes are essential for survival. Molecular genetics has uncovered that germ line mutations in nearly half of the genes that encode the 21-member connexin family of gap junction proteins are linked to one or more human diseases. Frequently, these mutations are autosomal recessive, whereas in other cases, autosomal dominant mutations manifest as disease. Given the broad and overlapping distribution of connexins in a wide arrangement of tissues, it is hard to predict where connexin-linked diseases will clinically manifest. For instance, the most prevalent connexin in the human body is connexin-43 (Cx43), yet autosomal dominant mutations in the GJA1 gene, which encodes Cx43, exhibit modest developmental disorders resulting in a disease termed oculodentodigital dysplasia. Autosomal recessive mutations in the gene encoding Cx26 result in moderate to severe sensorineural hearing loss, whereas autosomal dominant mutations produce hearing loss and a wide range of skin diseases, including palmoplantar keratoderma. Here, we will focus on autosomal dominant mutations of the genes encoding Cx26 and Cx43 in relation to models that link genotypes to phenotypic outcomes with particular reference to how these approaches provide insight into human disease.|*Mutation[MESH]|Animals[MESH]|Cell Line[MESH]|Connexin 26[MESH]|Connexin 43/*genetics/*physiology[MESH]|Connexins/*genetics/*physiology[MESH]|Disease Models, Animal[MESH]|Gap Junctions/*physiology[MESH]|Genes, Dominant[MESH]|Genetic Diseases, Inborn/genetics[MESH]|Germ-Line Mutation[MESH]|Humans[MESH]|Mice[MESH]|Models, Biological[MESH]|Models, Genetic[MESH]|Phenotype[MESH] |
