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Two Novel SLC5A5 Variants (Q263L and G350D) Causing Congenital Hypothyroidism
Kiyomi Abe1,2, Mikiko Koizumi3, Takahiko Kogai4
1Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan.
Abstract:
SLC5A5 encodes sodium-iodide symporter (NIS), which transports inorganic iodide into thyroid cells. Biallelic loss-of-function variants in SLC5A5 cause thyroid dyshormonogenesis due to iodide transport defect (ITD). We report a Japanese sibling with ITD carrying novel compound heterozygous SLC5A5 variants (p. [Gln263Leu]; [Gly350Asp]). The elder brother was diagnosed with congenital hypothyroidism (CH) through newborn screening (NBS), while the younger brother, with a negative NBS result, developed CH-related symptoms at age 3 months. We characterized the two variant NIS proteins in vitro and negligible iodide transport capacity of both proteins. These findings provide unique evidence for the structure-function relationship of the NIS protein.
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