RNA export through the nuclear pore complex: pathways, mechanisms, and imaging strategies

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• The nuclear pore complex (NPC) regulates gene expression by controlling RNA export from the nucleus.
• Various RNA classes (mRNAs, tRNAs, miRNAs, etc.) utilize specific pathways and factors for NPC transport.
• Understanding RNA transport dynamics is crucial for comprehending cellular function.

Purpose of the Study:

• To review and compare NPC-resolved imaging findings for different RNA classes.
• To describe methods for studying mRNA and pre-ribosomal particle export at the NPC.
• To identify challenges and propose strategies for studying small or low-abundance RNA transport.

Main Methods:

• Single-molecule microscopy
• Super-resolution microscopy
• Quantitative analysis of RNA trajectories and interactions within the NPC.

Main Results:

• NPC-resolved imaging reveals shared principles and cargo-specific behaviors in RNA export.
• Established toolboxes enable detailed analysis of mRNA and pre-ribosomal particle transport.
• Technical limitations hinder the study of small/low-abundance RNAs at the NPC.

Conclusions:

• A unified framework is provided for dissecting RNA dynamics at the nuclear pore using single-molecule techniques.
• Future research should focus on overcoming current limitations to study diverse RNA classes.
• Advances in imaging and analysis will deepen our understanding of RNA-NPC interactions.