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Biological Chemistry

Editor-in-Chief: Brüne, Bernhard

Editorial Board Member: Buchner, Johannes / Lei, Ming / Ludwig, Stephan / Sies, Helmut / Turk, Boris / Wittinghofer, Alfred

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The Oct-1 POU Domain Directs Developmentally Regulated Nuclear Translocation in Xenopus Embryos

G.J.C. Veenstra / M.Th. Mathu / O.H.J. Destrée

Citation Information: Biological Chemistry. Volume 380, Issue 2, Pages 253–257, ISSN (Print) 1431-6730, DOI: 10.1515/BC.1999.033, June 2005

Publication History

Published Online:


Early embryonic development in Xenopus is characterized by transcriptional repression which is relieved at the mid-blastula stage. Here we show that most of the maternally inherited POU domain transcription factor Oct-1 is retained in the cytoplasm during early development, and that it gradually translocates to the nucleus around the mid-blastula transition. Overexpressed epitope-tagged Oct-1 exhibits highly similar localization properties compared to endogenous protein. The amino acid sequence that directs this developmentally regulated nuclear translocation resides in the POU domain. Our findings may suggest that cytoplasmic retention of Oct-1 facilitates or contributes to the repression of Oct-1 target genes before the midblastula transition.

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