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Published on: March 23, 2022
Hypothesis: SLC12A3 Polymorphism modifies thiazide hypersensitivity of antenatal Bartter syndrome to thiazide
Cherry Mammen1, Rosemarie Rupps, Peter Trnka
1Department of Pediatrics, Division of Nephrology, University of British Columbia, Vancouver, Canada. cmammen@cw.bc.ca
Abstract:
We report a 5-year-old boy with thiazide-resistant Bartter syndrome. This is highly unusual since thiazide hypersensitivity is a common diagnostic finding in Bartter syndrome patients. Subsequent molecular testing identified compound heterozygosity for two novel mutations in KCNJ1, (c.556A > G and c.683G > A) which is associated with Bartter syndrome, and a paternally inherited polymorphism in SLC12A3 (c.791G > C). Mutations in SLC12A3 cause the thiazide-resistant tubulopathy Gitelman syndrome. Based on published studies of this polymorphism in SLC12A3 and the features of the proband's father, we postulate that this polymorphism modifies the phenotype of Bartter syndrome in the proband to thiazide resistance.
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