Double-stranded RNA transcribed from vector-based oligodeoxynucleotide acts as transcription factor decoy.

Area of Science:

• Molecular Biology
• Gene Regulation
• Oligonucleotide Therapeutics

Background:

• Transcription factors (TFs) are crucial regulators of gene expression.
• Decoy strategies aim to inhibit TF activity by sequestering them.
• Existing decoy methods face challenges in stability and delivery.

Purpose of the Study:

• To design and validate a novel vector-based oligodeoxynucleotide (VB-ODN) system as a decoy for blocking TF activity.
• To assess the efficacy of VB-ODNs in inhibiting specific TF functions and downstream gene expression.
• To demonstrate the versatility of VB-ODNs for targeting multiple TFs.

Main Methods:

• Design of VB-ODNs incorporating TF consensus sequences.
• Application of VB-ODNs targeting Nuclear factor-κB (NF-κB) in HEK293 cells.
• Assessment of cell viability and downstream gene expression.
• Electrophoretic mobility shift assay (EMSA) to confirm VB-ODN-TF binding.

Main Results:

• NF-κB-targeted VB-ODN significantly inhibited HEK293 cell viability.
• Downstream gene expression regulated by NF-κB was decreased by VB-ODN.
• EMSA confirmed specific binding between the double-stranded RNA produced by VB-ODN and NF-κB.
• VB-ODNs designed for three additional TFs also effectively inhibited their respective downstream gene expression without affecting TF levels.

Conclusions:

• VB-ODNs represent a new and effective design for blocking TF activity.
• This decoy strategy offers a promising approach for modulating gene expression.
• The VB-ODN system demonstrates potential for therapeutic applications targeting TF-mediated processes.