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Analysis of Termination of Transcription Using BrUTP-strand-specific Transcription Run-on (TRO) Approach
Published on: March 12, 2017
Transcriptional termination enhances protein expression in human cells
Steven West1, Nicholas J Proudfoot
1Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX13RE, UK.
Molecular Cell
|February 17, 2009
Summary
Transcriptional termination, essential for gene expression, drives optimal RNA polymerase II (Pol II) output. This process enhances pre-messenger RNA (pre-mRNA) processing and prevents nuclear surveillance, particularly with noncanonical poly(A) signals.
Area of Science:
- Molecular Biology
- Gene Regulation
- Biochemistry
Background:
- Transcriptional termination by RNA polymerase II (Pol II) in mammals involves poly(A) (pA) signals and terminator sequences.
- Termination is triggered by pA signal recognition and subsequent pre-mRNA cleavage.
- This process has been traditionally viewed as having minimal impact on overall gene expression levels.
Purpose of the Study:
- To investigate the role of transcriptional termination in regulating gene expression.
- To determine if termination influences pre-mRNA processing and nuclear surveillance.
- To elucidate the impact of termination, especially with noncanonical pA signals.
Main Methods:
- Analysis of transcriptional termination mechanisms in mammalian systems.
- Investigating the correlation between termination efficiency and gene expression levels.
- Assessing the impact of termination on post-transcriptional pre-mRNA processing and nuclear export.
Main Results:
- Demonstrated that transcriptional termination is a driving force for optimal gene expression.
- Observed the most significant effects of termination in genes with weak or noncanonical pA signals.
- Established that Pol II termination enhances the efficiency of post-transcriptional pre-mRNA processing, leading to transcript survival.
Conclusions:
- Transcriptional termination plays a crucial, active role in maximizing gene expression.
- Termination efficiency is particularly important for genes with less defined pA signals.
- Enhanced pre-mRNA processing and evasion of nuclear surveillance are key outcomes of effective Pol II termination.
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