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Genetic Analysis of Dent's Disease and Functional Research of CLCN5 Mutations.
DNA and Cell Biology 2017 December
Dent's disease is an X-linked inherited renal disease. Patients with Dent's disease often carry mutations in genes encoding the Cl-/H+ exchanger ClC-5 and/or inositol polyphosphate 5-phosphatase (OCRL1). However, the mutations involved and the biochemical effects of these mutations are not fully understood. To characterize genetic changes in Dent's disease patients, in this study, samples from nine Chinese patients were subjected to genetic analysis. Among the nine patients, six were classified as having Dent-1 disease, one had Dent-2 disease, and two could not be classified. Expression of ClC-5 carrying Dent's disease-associated mutations in HEK293 cells had varying effects: (1) no detectable expression of mutant protein; (2) retention of a truncated protein in the endoplasmic reticulum; or (3) diminished protein expression with normal distribution in early endosomes. Dent's disease patients showed genetic heterogeneity and over 20% of patients did not have CLCN5 or OCRL1 mutations, suggesting the existence of other genetic factors. Using next-generation sequencing, we identified possible modifier genes that have not been previously reported in Dent's disease patients. Heterozygous variants in CFTR, SCNN1A, and SCNN1B genes associated with cystic fibrosis (CF) or CF-like disease were detected in four of our nine patients. These results may form the basis for future characterization of Dent's disease and genetic counseling approaches.
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