Templating efficiency of naked DNA

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• Template-directed DNA synthesis is essential for life, typically mediated by polymerases.
• Assessing DNA's intrinsic ability to direct nucleotide incorporation is challenging due to polymerase involvement.

Purpose of the Study:

• To investigate enzyme-free primer extension and DNA's inherent capacity for template-directed nucleotide incorporation.
• To quantify the efficiency and accuracy of DNA-based primer extension across various sequence contexts.

Main Methods:

• Utilized 64 different DNA sequences to test enzyme-free primer extension.
• Analyzed primer extension rates and accuracy with balanced monomer mixtures and a downstream-binding strand.

Main Results:

• All sequences supported enzyme-free primer extension (>93% efficiency) when monomers were reactive.
• Sequence context showed minimal impact on extension rates, with differences less than two orders of magnitude.
• High accuracy was observed, with correct base incorporation exceeding 90% for many triplets.

Conclusions:

• DNA possesses a significant intrinsic ability to direct its own replication without enzymes.
• The findings clarify substrate contributions in polymerase-catalyzed replication and highlight DNA's role as genetic material.