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Thyroid Division, Department of Medicine, Brigham and Womens Hospital Harvard Medical School (S.-W.K., B.G., H.M.T., J.W.H., P.R.L.), Boston, Massachusetts 02115; the Department of Physiology and Biochemistry, University of Veterinary Science (T.B., P.R.), H-1400 Budapest, Hungary; and the Dipartimento Di Biologia Cellulare E Molecolare L. Califano, Universtta Degli Studi Di Napoli (D.S.), 80131 Naples, Italy
Address all correspondence and requests for reprints to: P. Reed Larsen, M.D., Thyroid Division, Department of Medicine, Brigham and Womens Hospital, Harvard Medical School, Boston, Massachusetts 02115. E-mail: larsen{at}rascal.med.harvard.edu
The type 2 iodothyronine deiodinase (D2) catalyzes T4
activation. In humans, unlike rodents, it is widely expressed, and its
action probably contributes to both intracellular and plasma
T3 pools. We have isolated the 6.5-kb 5'-flanking region
(FR) and the previously uncloned 553 nucleotides (nt) of the
5'-untranslated region (UTR) of hdio2. The 5'-UTR is
complex, with three transcription start sites (TSS) (708, 31, and
24
nt 5' to the ATG), an alternatively spliced approximately 300-nt intron
in the 5'-UTR, and three short open reading frames 5' to the initiator
ATG. The previously reported approximately 7.5-kb D2 messenger RNA
(mRNA) is actually an approximately 7-kb doublet that is present in
thyroid, pituitary, cardiac and skeletal muscle, and possibly brain,
but with only the longer transcript in placenta. A canonical cAMP
response element-binding protein-binding site is present at about 90 bp
5' to the most 5'-TSS. It accounts for the robust response of the
6.8-kb hdio2 5'-FR to protein kinase A. Forskolin
increases D2 mRNA in human thyroid cells, which may explain the high D2
mRNA in Graves thyroid and thyroid adenomas. The hdio2
gene structure and Northern blot results suggest that D2 expression is
tightly controlled and tissue specific.
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