Bicyclic Caged Morpholino Oligonucleotides for Optical Gene Silencing

Area of Science:

• Molecular Biology
• Oligonucleotide Chemistry
• Gene Regulation

Background:

• Caged morpholino oligonucleotides (cMOs) are light-inducible gene silencing tools.
• Existing cMO designs (hairpin, duplex, cyclic, caged nucleobases) offer optical control but can have limited dynamic range.
• Antisense technologies are crucial for modulating RNA splicing and translation.

Purpose of the Study:

• To develop a novel caging strategy for morpholino oligonucleotides (MOs) with improved conformational resistance.
• To create a bicyclic cMO (bicyclic cMO) resistant to RNA binding.
• To evaluate the efficacy of the bicyclic cMO design in zebrafish embryos.

Main Methods:

• Conjugation of MO termini to an internal position via a self-immolative trifunctional linker.
• Generation of a bicyclic cMO structure.
• Demonstration of efficacy in zebrafish embryos.
• Comparison with linear MOs and monocyclic constructs.

Main Results:

• A novel bicyclic cMO design was successfully developed.
• The bicyclic cMO exhibits conformational resistance to RNA binding.
• The new cMO design demonstrated efficacy in zebrafish embryos.
• Comparative analysis showed potential advantages over linear and monocyclic MOs.

Conclusions:

• The developed bicyclic cMO represents an advancement in caged morpholino oligonucleotide technology.
• This new design offers enhanced conformational stability for improved optical gene silencing.
• The bicyclic cMO strategy holds promise for precise control of RNA splicing and translation in vivo.