The structure of the coding and 5'-flanking region of the type 1 iodothyronine deiodinase (dio1) gene is normal in a patient with suspected congenital dio1 deficiency.
We analyzed the exon-intron structure of the human type 1 deiodinase gene (dio1) and compared it with that of a patient with suspected congenital type 1 deiodinase (D1) deficiency. The hdio1 gene is identical in exon-intron arrangement to the mouse gene, with coding sequences and a selenocysteine insertion sequence (SECIS) element contained in four exons. There were no mutations in the sequences of exons 1-4 of the patient's genomic DNA. Functional studies by transient expression techniques showed no difference in basal promoter activity or T3 responsiveness between the patient's and the normal dio1 gene. A structural abnormality in the dio1 gene is not a likely explanation for this patient's D1-deficient phenotype.
Toyoda
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Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.
Kleinhaus
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N
Larsen
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PR
D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics; D015870:Gene Expression; D005796:Genes; D006801:Humans; D007453:Iodide Peroxidase / Q000172:deficiency* / Q000235:genetics*; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D012016:Reference Values
D004247:DNA; D007453:Iodide Peroxidase