An efficient and versatile solid-phase synthesis of 5'- and 3'-conjugated oligonucleotides

Area of Science:

• Chemical synthesis
• Oligonucleotide chemistry
• Bioconjugation

Background:

• Oligonucleotide conjugates are crucial for diagnostics and therapeutics.
• Existing methods for synthesizing these conjugates can be complex and yield impurities.
• A need exists for efficient and high-purity production strategies.

Purpose of the Study:

• To develop an easy and efficient solid-phase strategy for synthesizing 5' and 3' oligonucleotide conjugates.
• To enable the incorporation of various labels into oligonucleotide conjugates.
• To achieve high purity in the final oligonucleotide conjugate products.

Main Methods:

• Utilized ad hoc derivatized solid supports for nucleoside attachment via a phosphate linkage.
• Employed both pre-DNA assembly and post-DNA assembly conjugation approaches.
• Synthesized and characterized a range of 5' and 3' oligonucleotide conjugates with diverse labels.

Main Results:

• Successfully developed a straightforward and efficient solid-phase synthesis strategy.
• Achieved high purity of the resulting 5' and 3' oligonucleotide conjugates.
• Demonstrated the covalent linkage of various labels through phosphodiester or phosphoramidate bonds.

Conclusions:

• The developed solid-phase strategy provides a robust method for producing pure oligonucleotide conjugates.
• This approach facilitates the synthesis of diverse oligonucleotide conjugates for potential applications.
• The method is efficient for both 5' and 3' end modifications.