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Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae

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Engineering a robust DNA split proximity circuit with minimized circuit leakage.

Yan Shan Ang¹, Rachel Tong¹, Lin-Yue Lanry Yung²

¹Chemical & Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585.

Nucleic Acids Research

|May 22, 2016

Summary

Researchers developed a DNA circuit that overcomes leakage issues for biomolecular sensing. A novel

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Area of Science:

Synthetic Biology
Molecular Engineering
Biomolecular Sensing

Background:

DNA circuits offer programmable autonomous sensing of dynamic biological events.
Circuit leakage, particularly from truncated oligonucleotides, impedes experimental implementation.
Existing designs struggle with unwanted signal generation and reduced specificity.

Purpose of the Study:

To systematically analyze and mitigate circuit leakage in DNA proximity circuits.
To engineer a robust DNA circuit for sensitive and specific biomolecular detection.
To enhance strand displacement kinetics and define optimal domain lengths for circuit components.

Main Methods:

Analysis of leakage sources in a split proximity DNA circuit.
Introduction of 'inter-domain bridging' to eliminate toehold-independent leakage.
Kinetic analysis of intermediate complexes and domain length optimization.
Implementation and testing on a model streptavidin-biotin system.

Main Results:

Identified 3'-truncated oligonucleotides as the primary cause of circuit leakage.
Demonstrated that 'inter-domain bridging' effectively eliminates leakage and enhances kinetics.
Optimized domain lengths for reporter toehold and association regions.
Achieved a robust DNA circuit functional in a model system, resistant to leakage and interference.

Conclusions:

A novel DNA circuit design effectively overcomes leakage challenges in biomolecular sensing.
The 'inter-domain bridging' strategy provides a robust solution for signal transduction.
This approach enables reliable probing of diverse biomolecular interactions.