Related Experiment Video
Updated: Nov 10, 2025

Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
Published on: May 13, 2019
Spt4 Promotes Pol I Processivity and Transcription Elongation
Abigail K Huffines1, Yvonne J K Edwards1, David A Schneider1
1Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham 720 20th Street South, Birmingham, AL 35294, USA.
The Spt4 protein is crucial for RNA Polymerase I (Pol I) transcription elongation in yeast. Deleting SPT4 impairs Pol I processivity, especially in G-rich ribosomal DNA regions.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- RNA polymerases (Pols) I, II, and III are essential for eukaryotic RNA synthesis.
- Spt4, a transcription factor, forms the Spt4/5 complex (DSIF) and interacts with Pol I.
- Previous studies noted transcription defects upon SPT4 deletion, but the mechanism remained unclear.
Purpose of the Study:
- To investigate the role of Spt4 in RNA Polymerase I transcription elongation in vivo.
- To elucidate the mechanism by which Spt4 influences Pol I activity.
Main Methods:
- Utilized Native Elongating Transcript Sequencing (NET-seq) in Saccharomyces cerevisiae (yeast).
- Analyzed global occupancy of Pol I at single nucleotide resolution in wild-type and spt4△ cells.
Main Results:
- Spt4 promotes Pol I processivity and enhances transcription elongation.
- This effect is particularly pronounced in G-rich regions of ribosomal DNA.
- Data suggest Spt4/5 directly impacts Pol I transcription elongation.
Conclusions:
- Spt4 is essential for efficient Pol I transcription elongation.
- The Spt4/5 complex plays a direct role in regulating Pol I processivity, especially in challenging DNA sequences.
More Related Videos
11:34Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins
Published on: August 9, 2019
09:21Saccharomyces cerevisiae Metabolic Labeling with 4-thiouracil and the Quantification of Newly Synthesized mRNA As a Proxy for RNA Polymerase II Activity
Published on: October 22, 2018
Related Concept Videos
Transcription Elongation Factors
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA...
Transcription Elongation Factors
Chromatin Structure Regulates pre-mRNA Processing
The chromatin structure, especially...
Transcription Attenuation in Prokaryotes
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
RNA Polymerase II Accessory Proteins
RNA Polymerase II Accessory Proteins