An Optimized Protocol for Electrophoretic Mobility Shift Assay Using Infrared Fluorescent Dye-labeled...

Area of Science:

• Molecular Biology
• Genetics
• Neuroscience

Background:

• Electrophoretic Mobility Shift Assays (EMSA) are crucial for studying protein-DNA interactions.
• Traditional EMSA relies on radioactivity, posing handling, cost, and safety challenges.
• Fluorescent labeling offers a safer, more efficient alternative for EMSA.

Purpose of the Study:

• To present an optimized, cost-effective protocol for fluorescent EMSA (fEMSA).
• To investigate the impact of a SOX-2 G73E mutation on DNA binding and olfactory neuron diversification.
• To provide mechanistic insights into olfactory neuron type diversification.

Main Methods:

• Developed and optimized a step-by-step fluorescent EMSA (fEMSA) protocol.
• Utilized infrared fluorescent dye-labeled oligonucleotides with SOX-2 target sites.
• Employed purified wild-type (WT) and mutant SOX-2 (SOX-2^G73E) proteins.

Main Results:

• Demonstrated successful application of fEMSA for analyzing protein-DNA interactions.
• Showed that the SOX-2^G73E mutation alters specific DNA binding activity.
• Identified a link between altered SOX-2 DNA binding and olfactory neuron identity transformation.

Conclusions:

• fEMSA is a viable and advantageous alternative to radioactive EMSA.
• The SOX-2 G73E mutation disrupts DNA binding, leading to olfactory neuron misspecification.
• This work provides a valuable tool and mechanistic understanding for studying transcription factor function.