Imaging of endogenous RNA in live cells using sequence-activated fluorescent RNA probes

Area of Science:

• Molecular Biology
• Biochemistry
• Cell Biology

Background:

• RNA molecules are crucial for numerous cellular processes, including gene regulation and chromosome maintenance.
• Accurate visualization of RNA in its native cellular environment is essential for understanding its functions.
• Existing RNA imaging techniques face limitations in specificity, robustness, and real-time tracking.

Purpose of the Study:

• To develop a novel, sequence-specific method for fluorescently labeling and imaging RNA in living and fixed cells.
• To create a versatile tool that overcomes limitations of current RNA imaging technologies.
• To demonstrate the utility of the new technique in tracking dynamic RNA processes within cells.

Main Methods:

• Development of a sequence-activated fluorescent RNA (SaFR) system utilizing a target-dependent conformational change.
• Design of fluorogenic RNA structures that are activated upon binding to specific target RNA sequences.
• Application of SaFR for imaging both exogenous and endogenous RNAs in cellular models.
• Utilizing SaFR to monitor the real-time dynamics of stress granule assembly and disassembly.

Main Results:

• The SaFR technique demonstrated high specificity, large dynamic ranges, and rapid fluorescence signal generation.
• Successful imaging of both exogenous and endogenous RNAs in live and fixed cellular systems was achieved.
• SaFR effectively monitored the dynamic assembly and disassembly of stress granules in real-time.
• The system showed robust performance, enabling clear visualization of RNA localization and dynamics.

Conclusions:

• SaFR provides a robust and versatile platform for labeling and imaging endogenous RNA within cells.
• This technique facilitates the study of RNA localization, function, and molecular mechanisms.
• SaFR is a valuable tool for advancing research in molecular biology and cell biology by enabling precise RNA visualization.