A universal probe system for low-abundance point mutation detection based on endonuclease IV

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Single base mutations are critical in cancer diagnosis and treatment.
• Fluorescent probe methods are key for detecting these mutations.
• Existing methods can be time-consuming and costly for multi-site detection.

Purpose of the Study:

• To develop a universal probe detection system for single-base mutations.
• To overcome the limitations of designing individual probes for each mutation site.
• To provide a rapid, economical, and efficient method for clinical applications.

Main Methods:

• Constructed a universal probe detection system utilizing endonuclease IV and DNA strand displacement reactions.
• Employed a two-step toehold strand displacement mechanism to relay mutation information to a universal strand.
• Validated the system by detecting common clinical mutation sites (PTEN R130Q, EGFR L858R, PTEN rs1473918395).

Main Results:

• The developed system eliminates the need for mutation-specific probe design.
• Achieved a detection limit ranging from 0.1% to 1% for clinical mutation sites.
• Demonstrated advantages of simple operation, rapid detection, and low cost.

Conclusions:

• The universal probe detection system offers a novel approach for clinical single-base mutation detection.
• The method presents broad application prospects in cancer diagnosis and prognostic evaluation.
• This technology provides a rapid and economical solution for molecular diagnostics.