Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 101, Issue 37, Pages 13525-13530Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0405536101
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Funding
- NHLBI NIH HHS [P50 HL062178-050003] Funding Source: Medline
- NIGMS NIH HHS [R01 GM069944-04, R01 GM069944-01, R01 GM069944-02, R01 GM069944-03, R01 GM069944] Funding Source: Medline
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The general transcription factor TATA-binding protein (TBP) is a key initiation factor involved in transcription by all three eukaryotic RNA polymerases. In addition, the related metazoan-specific TBP-like factor (TLF/TRF2) is essential for transcription of a distinct subset of genes. Here we characterize the vertebrate-specific TBP-like factor TBP2, using in vitro assays, in vivo antisense knockdown, and mRNA rescue experiments, as well as chromatin immunoprecipitation. We show that TBP2 is recruited to promoters in Xenopus oocytes in the absence of detectable TBP recruitment. Furthermore, TBP2 is essential for gastrulation and for the transcription of a subset of genes during Xenopus embryogenesis. In embryos, TBP2 protein is much less abundant than TBP, and moderate overexpression of TBP2 partially rescues an antisense knockdown of TBP levels and restores transcription of many TBP-dependent genes. TBP2 may be a TBP replacement factor in oocytes, whereas in embryos both TBP and TBP2 are required even though they exhibit partial redundancy and gene selectivity.
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