Mutations in the iodotyrosine deiodinase gene and hypothyroidism

Jose Moreno Navarro, Wim Klootwijk, Hans van Toor, G Pinto, M D'Alessandro, A Leger, D Goudie, M Polak, A Gruters, Theo Visser

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Abstract

DEHAL1 has been identified as the gene encoding iodotyrosine deiodinase in the thyroid, where it controls the reuse of iodide for thyroid hormone synthesis. We screened patients with hypothyroidism who had features suggestive of an iodotyrosine deiodinase defect for mutations in DEHAL1. Two missense mutations and a deletion of three base pairs were identified in four patients from three unrelated families; all the patients had a dramatic reduction of in vitro activity of iodotyrosine deiodinase. Patients had severe goitrous hypothyroidism, which was evident in infancy and childhood. Two patients had cognitive deficits due to late diagnosis and treatment. Thus, mutations in DEHAL1 led to a deficiency in iodotyrosine deiodinase in these patients. Because infants with DEHAL1 defects may have normal thyroid function at birth, they may be missed by neonatal screening programs for congenital hypothyroidism.
Original languageUndefined/Unknown
Pages (from-to)1811-1818
Number of pages8
JournalNew England Journal of Medicine
Volume358
Issue number17
DOIs
Publication statusPublished - 2008

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