Single-Molecule Live-Cell Visualization of Pre-mRNA Splicing.

Area of Science:

• Molecular Biology
• Cell Biology
• Biophysics

Background:

• Live-cell imaging is crucial for understanding cellular processes.
• Genetically encoded fluorescent tags and advanced microscopy enable detection of single molecules in vivo.
• Visualizing dynamic molecular events like RNA processing remains challenging.

Purpose of the Study:

• To develop and describe a novel approach for visualizing single nascent pre-messenger RNA (pre-mRNA) molecules in real time.
• To quantify the dynamics of intron synthesis and excision during pre-mRNA maturation.
• To advance the capabilities of live-cell microscopy for studying gene expression.

Main Methods:

• Utilized genetically encoded fluorescent tags for pre-mRNA labeling.
• Employed high-resolution fluorescence microscopy for live-cell imaging.
• Developed quantitative methods to track and analyze pre-mRNA dynamics, including intron dynamics.

Main Results:

• Successfully visualized individual nascent pre-mRNA molecules within living cells.
• Quantified the real-time kinetics of intron synthesis and excision.
• Demonstrated the feasibility of tracking dynamic molecular events at the single-molecule level.

Conclusions:

• The described approach provides unprecedented insight into the temporal dynamics of pre-mRNA processing.
• This method opens new avenues for studying gene expression regulation at the molecular level in real time.
• Advances in live-cell imaging and molecular tagging are transforming our understanding of fundamental biological processes.