Related Experiment Video
Updated: Jul 31, 2025

Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins
Published on: August 9, 2019
Nuclear SRP9/SRP14 heterodimer transcriptionally regulates 7SL and BC200 RNA expression
Daniel Gussakovsky1, Evan P Booy1, Mira J F Brown1
1Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.
Abstract:
The SRP9/SRP14 heterodimer is a central component of signal recognition particle (SRP) RNA (7SL) processing and Alu retrotransposition. In this study, we sought to establish the role of nuclear SRP9/SRP14 in the transcriptional regulation of 7SL and BC200 RNA. 7SL and BC200 RNA steady-state levels, rate of decay, and transcriptional activity were evaluated under SRP9/SRP14 knockdown conditions. Immunofluorescent imaging, and subcellular fractionation of MCF-7 cells, revealed a distinct nuclear localization for SRP9/SRP14. The relationship between this localization and transcriptional activity at 7SL and BC200 genes was also examined. These findings demonstrate a novel nuclear function of SRP9/SRP14 establishing that this heterodimer transcriptionally regulates 7SL and BC200 RNA expression. We describe a model in which SRP9/SRP14 cotranscriptionally regulate 7SL and BC200 RNA expression. Our model is also a plausible pathway for regulating Alu RNA transcription and is consistent with the hypothesized roles of SRP9/SRP14 transporting 7SL RNA into the nucleolus for posttranscriptional processing, and trafficking of Alu RNA for retrotransposition.
Related Concept Videos
Regulation of Nuclear Protein Sorting
Regulation of Expression at Multiple Steps
RNA Splicing
Nuclear Export of mRNA
Alternative RNA Splicing
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
Chromatin Structure Regulates pre-mRNA Processing
The chromatin structure, especially...

