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Proc Natl Acad Sci U S A
2004 Sep 14;10137:13525-30. doi: 10.1073/pnas.0405536101.
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Specialized and redundant roles of TBP and a vertebrate-specific TBP paralog in embryonic gene regulation in Xenopus.
Jallow Z
,
Jacobi UG
,
Weeks DL
,
Dawid IB
,
Veenstra GJ
.
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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 factorTBP2, 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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