A cell type specific factor recognizes the rat thyroglobulin promoter

Anna Maria Musti, Valeria Matilde Ursini, Enrico Vittorio Avvedimento, Vincenzo Zimarino, Roberto Di Lauro

Research output: Contribution to journalArticlepeer-review


We have fused a 900 base pair long DNA segment containing the transcriptional start site of the rat thyroglobulin (Tg) gene to the bacterial gene for chloramphenicol acetyltransferase (cat). The fusion gene has been introduced into three different cell lines derived from the rat thyroid gland and into a rat liver cell line. Expression of the fusion gene was detected only in the one thyroid cell line that is able to express the endogenous Tg gene. The minimum DNA sequence required for the cell type specific expression was determined by deletion analysis; it extends 170 nucleotides upstream of the transcription initiation site. The Tg promoter contains a readily detectable binding sites for a factor present in salt extracts of thyroid cell nuclei. This binding site is not recognized by the nuclear extracts of any other cell type that we have tested, suggesting that it may help mediate the cell type specific expression of the Tg gene.

Original languageEnglish
Pages (from-to)8149-8166
Number of pages18
JournalNucleic Acids Research
Issue number20
Publication statusPublished - Oct 26 1987

ASJC Scopus subject areas

  • Statistics, Probability and Uncertainty
  • Applied Mathematics
  • Health, Toxicology and Mutagenesis
  • Toxicology
  • Genetics(clinical)
  • Genetics


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