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Novel, Missense, and Loss-of-Function Mutations in the Sodium/Iodide Symporter Gene Causing Iodide Transport Defect in Three Japanese Patients

Department of Laboratory Medicine (S.K., A.M.), Kyoto University School of Medicine, Kyoto 606-8507; Department of Pediatrics (S.I.), Miyazaki Medical College, Kiyotake, Miyazaki 889-1602, Japan; Department of Physiology (S.M.J.), The Ohio State University, Columbus, Ohio 43210

Abstract

Iodide transport defect is a disorder affecting the active transport of iodide, an essential step in the synthesis of thyroid hormones. We have identified novel germ-line mutations in the Na⁺/I^- symporter (NIS) gene from these Japanese patients with iodide transport defect. One patient had a compound heterozygous mutation of T354P/G93R (Gly93 ARg [GGC CGC]), and two sibling patients had a homozygous mutation of G543E (Gly543 Glu [CGA GAA]). G93R and G543E, two novel mutations, are located in the 3rd and 12th transmembrane domains of NIS which are encoded by exons 1 and 13, respectively. The NIS mutants carring these mutations had minimal iodide uptake activity when expressed in COS-7 cells, confirming that the identified mutations are the direct cause of the iodide transport defect in these patients. Genotyping of unaffected family members and functional assays of co-transfected COS-7 cells indicate that expression of one normal NIS allele in the heterozygote (T354P, G93R, or G543E) is sufficient to maintain active iodide uptake activity. Thus, one of these NIS mutants acts as a dominant-negative mutant.

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