RNA detection in situ with FISH-STICs.

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• In situ detection of RNA is crucial for molecular biology.
• Current methods using labeled transcripts or synthetic oligodeoxynucleotides (ODN) have limitations.

Purpose of the Study:

• To develop a novel, efficient, and accessible method for in situ RNA detection using unmodified synthetic oligonucleotides.
• To introduce Fluorescence In Situ Hybridization with Sequential Tethered and Intertwined ODN Complexes (FISH-STICs) as a new probe strategy.

Main Methods:

• Utilizing commercially synthesized oligonucleotides as direct probes for RNA detection in cultured cells.
• Developing the FISH-STICs approach for enhanced probe binding and fluorescent labeling.
• Applying FISH-STICs for detecting specific mRNA molecules, including β-actin, γ-actin, and neuron-specific transcripts.

Main Results:

• FISH-STICs successfully detect mRNA in cultured cells without probe modification.
• The method allows for high concentrations of fluorescent probes to bind target RNA.
• Detection sensitivity can be improved by using multiple FISH-STIC probes, enabling robust mRNA quantification.
• Demonstrated non-overlapping distribution of β-actin and γ-actin mRNA in fibroblasts.
• Successfully detected neuron-specific transcripts in primary hippocampal neurons.

Conclusions:

• FISH-STICs offer a practical and effective alternative for in situ RNA detection and quantification.
• This method leverages accessible commercial DNA synthesis for widespread laboratory use.
• FISH-STICs provide valuable insights into mRNA localization and expression patterns in various cell types.