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Cell Growth & Differentiation, Vol 7, Issue 2 251-261, Copyright © 1996 by American Association of Cancer Research


ARTICLES

Expression of thyroid transcription factor 1 gene can be regulated at the transcriptional and posttranscriptional levels

R Lonigro, M De Felice, E Biffali, PE Macchia, G Damante, C Asteria and R Di Lauro
Department of Science and Biomedical Technology, University of Udine, Italy.

The complete structure of the gene for thyroid transcription factor 1 (TTF-1), both in rats and humans, has been determined. The rat TTF-1 gene shows three transcriptional start sites and contains two introns, one of which is alternatively spliced. Nuclear run-on and transient transfection experiments indicate that TTF-1 gene expression can be controlled at different levels. Using thyroid and nonthyroid cell lines, it can be shown that transcriptional mechanisms are involved in controlling thyroid-specific expression of the TTF-1 gene. In contrast, in thyroid cells expressing an activated Ki-ras oncogene, the steady-state level of TTF-1 mRNA is greatly reduced, while transcription of the TTF-1 gene is only moderately affected, suggesting that the accumulation of TTF-1 mRNA can be regulated by a posttranscriptional, Ras-sensitive mechanism.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1996 by the American Association of Cancer Research.