First case of fetal goitrous hypothyroidism due to SLC5A5/NIS mutations

in European Journal of Endocrinology
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  • 1 INSERM U1016, Cochin Institute, Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris, France
  • 2 IMAGINE Institute affiliate, Paris, France
  • 3 Pediatric Endocrinology, Gynecology and Diabetology Unit, Hôpital Universitaire Necker-Enfants Malades, AP-HP, Paris, France
  • 4 Genomics Platform, INSERM UMR 1163, Imagine Institute, Paris Descartes Sorbonne Paris Cite University, Paris, France
  • 5 Bioinformatics Platform, IMAGINE Institute, Paris Descartes University, Paris, France
  • 6 Pediatric Endocrinology
  • 7 Department of Pathology, CHU de Bordeaux, Bordeaux, France
  • 8 Centre de Référence des Maladies Endocriniennes Rares de la Croissance et du Développement, Necker-Enfants Malades University Hospital, Paris, France
  • 9 Centre régional de dépistage néonatal (CRDN) Ile de France, Paris, France

Correspondence should be addressed to M Polak or A Carré; Email: michel.polak@aphp.fr or aurore.carre@inserm.fr
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Background:

Among patients with congenital hypothyroidism, 35% have dyshormonogenesis (DH) with thyroid gland in situ with or without goiter. The majority of DH cases are due to mutations in genes involved in thyroid hormone production as TG, TPO, SLC5A5/NIS, SLC26A4/PDS, IYD/DEHAL1, DUOX2, and DUOXA2, and are usually inherited on an autosomal recessive basis. Most previously reported cases of fetal hypothyroidism and goiter were related to TG or TPO mutations and recently DUOXA2.

Patient:

In a male patient with antenatal goiter treated with intraamniotic levothyroxine injections, whose long-term follow-up is described in detail, two novel NIS mutations were detected. Mutations of NIS were located in exon 1 (c.52G>A, p.G18R) and exon 13 (c.1546C>T, p.R516X), each mutation was inherited from parents, who are healthy carriers. The p.G18R mutation affecting the first transmembrane domain of the protein can be responsible for deficient iodide uptake. However, the second is a nonsense mutation leading probably to mRNA degradation. In addition, the patient has undergone a thyroidectomy and we have studied the thyroid tissue. The thyroid histology showed heterogeneity with large follicles, epithelial hyperplasia and many areas of fibrosis. Immunohistochemistry with NIS specific antibody showed NIS staining at the basolateral plasma membrane of the thyrocytes.

Conclusions:

We report the first case of fetal goitrous hypothyroidism due to two novel NIS mutations with access to thyroid tissue of the patient, specific histology studies and long-term follow-up. This case expands our knowledge and provides further insights on molecular causes of fetal goiter in humans.

 

     European Society of Endocrinology

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