What is the role of the distal convoluted tubule (DCT) in the pathogenesis of hypomagnesemia?

Updated: Oct 30, 2020
  • Author: Tibor Fulop, MD, PhD, FACP, FASN; Chief Editor: Vecihi Batuman, MD, FASN  more...
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In the distal convoluted tubule (DCT), magnesium is reabsorbed via an active, transcellular process that is thought to involve TRPM6, a member of the transient receptor potential (TRP) family of cation channels. [20, 21]  Mutations in TRPM6 have been identified as the underlying defect in patients with hypomagnesemia with secondary hypocalcemia (HSH), [9, 22, 23, 24]  an autosomal-recessive disorder that manifests in early infancy with generalized convulsions refractory to anticonvulsant treatment or with other symptoms of increased neuromuscular excitability, such as muscle spasms or tetany. Laboratory evaluation reveals extremely low serum magnesium and serum calcium levels.

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