Cyclic enzymatic solid phase synthesis of isotopically labeled DNA oligonucleotides

Area of Science:

• Biochemistry
• Molecular Biology
• Synthetic Chemistry

Background:

• Standard solid-phase DNA synthesis for isotopic labeling necessitates costly phosphoramidites in large quantities.
• This presents a significant economic barrier for researchers requiring labeled DNA for various applications.

Purpose of the Study:

• To develop a more economical protocol for isotopic DNA labeling.
• To enable efficient use and recycling of less expensive labeled DNA triphosphates (dNTPs).

Main Methods:

• Enzymatic, cyclic, solid-phase DNA synthesis utilizing an epoxy-activated solid support.
• Immobilization of DNA template with robust linkage stable under high pH conditions.
• Optimization of enzymatic fill-in, product release, and dNTP recycling without purification.

Main Results:

• Successful development of a protocol for cost-effective isotopic DNA labeling.
• Demonstrated efficient covalent attachment of DNA to the solid support.
• Generated a selectively [(13)C, (15)N] G labeled 10-mer duplex using the optimized protocol.

Conclusions:

• The developed enzymatic, cyclic, solid-phase synthesis offers a significantly more economical approach to isotopic DNA labeling.
• This method facilitates efficient reuse of labeled dNTPs, reducing overall experimental costs.
• The protocol is robust and effective for generating specifically labeled DNA duplexes.