Ontology type: schema:ScholarlyArticle Open Access: True
1999-01-28
AUTHORSMohamed T Ghorbel, Isabelle Seugnet, Nadia Hadj-Sahraoui, Piotr Topilko, Giovanni Levi, Barbara Demeneix
ABSTRACTKrox-24 (NGFI-A, Egr-1) is an immediate-early gene encoding a zinc finger transcription factor. As Krox-24 is expressed in brain areas showing post-natal neurogenesis during a thyroid hormone (T3)-sensitive period, we followed T3 effects on Krox-24 expression in newborn mice. We analysed whether regulation was associated with changes in mitotic activity in the subventricular zone and the cerebellum. In vivo T3-dependent Krox-24 transcription was studied by polyethylenimine-based gene transfer. T3 increased transcription from the Krox-24 promoter in both areas studied at post-natal day 2, but was without effect at day 6. An intact thyroid hormone response element (TRE) in the Krox-24 promoter was necessary for these inductions. These stage-dependent effects were also seen in endogenous Krox-24 mRNA levels: activation at day 2 and no effect at day 6. Moreover, similar results were obtained by examining β-galactosidase expression in heterozygous mice in which one allele of the Krox-24 gene was disrupted with an in-frame Lac-Z insertion. However, bromodeoxyuridine incorporation showed mitosis to continue through to day 6. We conclude first, that T3 activates Krox-24 transcription during early post-natal mitosis but that this effect is extinguished as development proceeds and second, loss of T3-dependent Krox-24 expression is not correlated with loss of mitotic activity. More... »
PAGES917-924
http://scigraph.springernature.com/pub.10.1038/sj.onc.1202378
DOIhttp://dx.doi.org/10.1038/sj.onc.1202378
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/10023667
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