Specific Increase of Protein Levels by Enhancing Translation Using Antisense Oligonucleotides Targeting Upstream Open...

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• Low levels of essential proteins contribute to various diseases, necessitating therapeutic strategies to boost protein expression.
• Upstream open reading frames (uORFs) in the 5' untranslated region (UTR) of messenger RNAs (mRNAs) can downregulate protein synthesis by inhibiting translation of the main coding sequence.
• This uORF-mediated translational repression reduces the efficiency of protein production from specific genes.

Purpose of the Study:

• To review recent findings on enhancing mRNA translation using antisense oligonucleotides (ASOs) that target uORF regions.
• To explore the potential of ASO-mediated uORF inhibition as a therapeutic strategy for increasing protein levels.
• To highlight the applicability of this approach in research and clinical settings.

Main Methods:

• Antisense oligonucleotides (ASOs) designed to specifically bind to the uAUG region of target mRNAs.
• Inhibition of uORF translation initiation through base-pairing of ASOs with the mRNA sequence.
• Assessment of protein expression levels in response to ASO treatment in various cell types and in vivo models.

Main Results:

• ASOs targeting uORFs effectively redirect translation to the primary open reading frame (ORF), thereby enhancing protein expression.
• The specificity of ASOs ensures sequence- and position-dependent action with minimal off-target effects.
• Increased protein levels were observed in human and mouse cells, as well as in live mice, demonstrating the in vivo efficacy of the approach.

Conclusions:

• ASO-mediated targeting of uORFs represents a promising strategy for upregulating protein expression.
• Given that uORFs are prevalent in approximately half of human mRNAs, this method holds significant potential as a research tool and therapeutic intervention.
• This approach could be valuable for treating a wide range of conditions linked to insufficient protein levels.