Homozygous loss-of-function mutations in SLC26A7 cause goitrous congenital hypothyroidism.
Serra, Eva G
Williams, E Dillwyn
American Society for Clinical Investigation (ASCI)
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Cangul, H., Liao, X., Schoenmakers, E., Kero, J., Barone, S., Srichomkwun, P., Iwayama, H., et al. (2018). Homozygous loss-of-function mutations in SLC26A7 cause goitrous congenital hypothyroidism.. JCI insight, 3 (20)https://doi.org/10.1172/jci.insight.99631
Defects in genes mediating thyroid hormone biosynthesis result in dyshormonogenic congenital hypothyroidism (CH). Here, we report homozygous truncating mutations in SLC26A7 in six unrelated families with goitrous, CH and show that goitrous hypothyroidism also occurs in Slc26a7 null mice. In both species, the gene is expressed predominantly in the thyroid gland, and loss of function is associated with impaired availability of iodine for thyroid hormone synthesis, partially corrected in mice by iodine supplementation. SLC26A7 is a member of the same transporter family as SLC26A4 (pendrin), an anion exchanger with affinity for iodide and chloride (among others), whose gene mutations cause congenital deafness and dyshormonogenic goiter. However, in contrast to pendrin, SLC26A7 does not mediate cellular iodide efflux and hearing in affected individuals is normal. We delineate a hitherto unrecognized role for SLC26A7 in thyroid hormone biosynthesis, for which the mechanism remains unclear.
UK10K Consortium, Thyroid Gland, Animals, Mice, Knockout, Humans, Mice, Goiter, Antiporters, Codon, Nonsense, Pedigree, DNA Mutational Analysis, Homozygote, Adult, Middle Aged, Child, Child, Preschool, Congenital Hypothyroidism, Female, Male, HEK293 Cells, Whole Exome Sequencing, Sulfate Transporters
Wellcome Trust (100574/Z/12/Z)
Wellcome Trust (100585/Z/12/Z)
Wellcome Trust (095564/Z/11/Z)
Wellcome Trust (091310/Z/10/Z)
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External DOI: https://doi.org/10.1172/jci.insight.99631
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286298