Spatial and Temporal Single-Cell Profiling of RNA Compartmentalization in Neurons with Nanotweezers

Area of Science:

• Cell Biology
• Neuroscience
• Molecular Biology

Background:

• Subcellular mRNA mapping in live cells is crucial for understanding gene expression dynamics, especially in polarized cells like neurons.
• Defects in mRNA localization are linked to neurological disorders, highlighting the need for precise analytical tools.
• Existing techniques often compromise between subcellular resolution, live-cell compatibility, and minimal invasiveness.

Purpose of the Study:

• To develop and utilize a novel nanotweezer technology for high-resolution, minimally invasive analysis of single-cell mRNA compartmentalization.
• To investigate dynamic changes in mRNA distribution within hippocampal neurons during development and in response to stimulation.
• To enable time-resolved, subcellular gene expression profiling in living neurons.

Main Methods:

• Development of a nanotweezer with a nanoscale footprint (∼100 nm) for non-aspirative RNA isolation from living cells.
• Application of the nanotweezer to hippocampal neurons at various developmental stages.
• Sequential sampling and precise targeting for tracking mRNA abundance changes in specific subcellular regions (soma, dendrites, dendritic spines) before and after stimulation.

Main Results:

• Demonstrated the feasibility of using nanotweezers for rapid, minimally invasive RNA isolation from live neurons.
• Successfully mapped single-cell mRNA compartmentalization in somatic and dendritic regions of developing hippocampal neurons.
• Tracked dynamic changes in dendritic spine mRNA abundance in response to neuronal stimulation within the same cell.

Conclusions:

• The nanotweezer technology provides a powerful new tool for time-resolved, subcellular gene expression profiling in live, polarized cells.
• This approach overcomes limitations of existing methods, offering enhanced precision and minimal invasiveness.
• Findings offer critical insights into neuronal gene regulation, with implications for understanding neurological diseases.