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Related Concept Videos

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Updated: Oct 5, 2025

Targeted RNA Sequencing Assay to Characterize Gene Expression and Genomic Alterations
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Massively parallel characterization of engineered transcript isoforms using direct RNA sequencing.

Matthew J Tarnowski1, Thomas E Gorochowski2,3

  • 1School of Biological Sciences, University of Bristol, Tyndall Avenue, Bristol, BS8 1TQ, UK.

Nature Communications
|January 22, 2022
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Summary
This summary is machine-generated.

Researchers engineered transcriptional valves to control RNA polymerase read-through, enabling precise regulation of gene expression. This innovation offers new tools for bioengineering and synthetic biology applications.

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Area of Science:

  • Molecular Biology
  • Synthetic Biology
  • Biotechnology

Background:

  • Transcriptional terminators normally halt RNA polymerase (RNAP) but exhibit stochasticity, leading to variable transcript isoforms.
  • Controlling transcript isoform abundance is crucial for regulating multi-gene constructs at the transcriptional level.
  • Existing methods lack precise control over RNAP termination efficiency.

Purpose of the Study:

  • To repurpose transcriptional terminators as tunable 'transcriptional valves' to regulate RNAP read-through.
  • To develop a high-throughput method for characterizing transcriptional valve performance.
  • To engineer multiplexed transcriptional control for applications like CRISPR guide RNA synthesis.

Main Methods:

  • Combinatorial DNA assembly was used to construct a library of 1780 transcriptional valves for T7 RNAP.
  • Nanopore-based direct RNA sequencing (dRNA-seq) was employed for simultaneous, nucleotide-resolution characterization of valve libraries in vitro.
  • Genetic design principles for tuning and insulating termination were elucidated through sequence-function analysis.

Main Results:

  • Demonstrated the ability of engineered transcriptional valves to tune the proportion of RNAP read-through.
  • Successfully characterized large libraries of transcriptional valves using dRNA-seq, revealing design principles.
  • Engineered valves for multiplexed regulation of CRISPR guide RNAs, showcasing practical application.

Conclusions:

  • Transcriptional valves provide a novel mechanism for controlling transcription and regulating gene expression.
  • Direct RNA sequencing is a powerful tool for exploring complex sequence-function relationships in genetic elements.
  • This work opens new avenues for bioengineering and synthetic biology, particularly in designing complex genetic circuits.