>[Re:4] APさんは書きました :
> 横からですが、真核生物の転写停止シグナルって見つかったんですか?
いくつか論文を当たりましたが、明確なコンセンサス配列は無いようです。
Skourti-Stathaki, K., Proudfoot, N. J., & Gromak, N. (2011). Human Senataxin Resolves RNA/DNA Hybrids Formed at Transcriptional Pause Sites to Promote Xrn2-Dependent Termination. Molecular Cell, 42(6), 794–805. http://doi.org/10.1016/j.molcel.2011.04.026からコピペ。
Efficient Pol II termination is dependent on both a functional poly(A) signal and downstream terminator sequences. Two classes of terminator sequences have been identified in human genes: cotranscriptionally cleaved (CoTC) RNA sequences and transcription pause sites. The human b-globin gene contains a CoTC element, located ~1kb downstream of the poly(A) site, which is essential for efficient Pol II transcriptional termination. Another pause site, defined as the G-rich MAZ termination element. The human b-actin gene possesses a G-rich pause element downstream of the poly(A) signal. Interestingly, genome-wide analysis reveals that G-rich sequences immediately downstream of poly(A) signals are relatively common in mammalian genes. |
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