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Molecular and Cellular Biology, December 1999, p. 7972-7982, Vol. 19, No. 12
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Translation of Maternal TATA-Binding Protein mRNA Potentiates Basal but Not Activated Transcription in Xenopus Embryos at the Midblastula Transition

Gert Jan C. Veenstra,1 Olivier H. J. Destrée,2 and Alan P. Wolffe1,*

Laboratory for Molecular Embryology, National Institute of Child Health and Human Development, Bethesda, Maryland 20892,1 and Hubrecht Laboratory, Netherlands Institute for Developmental Biology, 3584 CT Utrecht, The Netherlands2

Received 11 June 1999/Returned for modification 3 August 1999/Accepted 7 September 1999

Early embryonic development in Xenopus laevis is characterized by transcriptional repression which is relieved at the midblastula stage (MBT). Here we show that the relative abundance of TATA-binding protein (TBP) increases robustly at the MBT and that the mechanism underlying this increase is translation of maternally stored TBP RNA. We show that TBP is rate-limiting in egg extract under conditions that titrate nucleosome assembly. Precocious translation of TBP mRNA in Xenopus embryos facilitates transcription before the MBT, without requiring TBP to be prebound to the promoter before injection. This effect is transient in the absence of chromatin titration and is sustained when chromatin is titrated. These data show that translational regulation of TBP RNA contributes to limitations on the transcriptional capacity before the MBT. Second, we examined the ability of trans-acting factors to contribute to promoter activity before the MBT. Deletion of cis-acting elements does not affect histone H2B transcription in egg extract, a finding indicative of limited trans-activation. Moreover, in the context of the intact promoter, neither the transcriptional activator Oct-1, nor TBP, nor TFIID enable transcriptional activation in vitro. HeLa cell extract, however, reconstitutes activated transcription in mixed extracts. These data suggest a deficiency in egg extract cofactors required for activated transcription. We show that the capacity for activated H2B transcription is gradually acquired at the early gastrula transition. This transition occurs well after the blastula stage when the basal transcription machinery can first be complemented with TBP.

* Corresponding author. Mailing address: Laboratory for Molecular Embryology, NICHHD, NIH, Bldg. 18T, Rm. 106, Bethesda, MD 20892. Phone: (301) 496-4045. Fax: (301) 402-1323. E-mail: awlme{at}helix.nih.gov.

Molecular and Cellular Biology, December 1999, p. 7972-7982, Vol. 19, No. 12
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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