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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Mutations of the Down-regulated in adenoma (DRA) gene cause congenital chloride diarrhoea.
Nature Genetics 1996 November
A major transport function of the human intestine involves the absorption of chloride in exchange for bicarbonate. We have studied a recessively inherited defect of this exchange, congenital chloride diarrhoea (CLD; MIM 214700). The clinical presentation of CLD is a lifetime, potentially fatal diarrhoea with a high chloride content. The CLD locus was previously mapped to 7q3 adjacent to the cystic fibrosis gene (CFTR). By refined genetic and physical mapping, a cloned gene having anion transport function, Down-regulated in adenoma (DRA), was implicated as a positional and functional candidate for CLD. In this study, we report segregation of two missense mutations, delta V317 and H124L, and one frameshift mutation, 344delT, of DRA in 32 Finnish and four Polish CLD patients. The disease-causing nature of delta V317 is supported by genetic data in relation to the population history of Finland. By mRNA in situ hybridization, we demonstrate that the expression of DRA occurs preferentially in highly differentiated colonic epithelial cells, is unchanged in Finnish CLD patients with delta V317, and is low in undifferentiated (including neoplastic) cells. We conclude that DRA is an intestinal anion transport molecule that causes chloride diarrhoea when mutated.
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