Background-filtered telomerase activity assay with cyclic DNA cleavage amplification

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• Telomerase overexpression drives cancer cell proliferation, making it a key biomarker and therapeutic target.
• Current telomerase detection assays are often complex, hindering practical application.
• There is a need for simpler, more efficient methods to measure telomerase activity.

Purpose of the Study:

• To develop a straightforward and cost-effective assay for detecting telomerase activity.
• To establish a method capable of distinguishing cancer cells from normal cells based on telomerase levels.
• To demonstrate the utility of the assay in screening potential telomerase inhibitors.

Main Methods:

• Developed the Quenching-Exempt invader Signal Amplification Test (QUEST) using flap endonuclease I (FEN1) and graphene oxide (GO).
• QUEST utilizes FEN1 for signal amplification and GO for background signal quenching.
• The assay involves simple probe design without pre-preparation or separation steps.

Main Results:

• QUEST demonstrated high sensitivity and specificity in detecting telomerase activity.
• The assay successfully discriminated between cancer and normal cell lines.
• A candidate telomerase inhibitor was effectively screened using the QUEST assay.

Conclusions:

• QUEST offers a simplified, cost-effective, and efficient method for telomerase detection.
• The assay shows significant potential for cancer cell line discrimination and drug screening.
• QUEST represents a promising tool for advancing cancer biomarker research and therapeutic development.