A quantitative assay of telomerase activity

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• Telomerase is a key enzyme in telomere maintenance, linked to cellular immortality.
• The standard telomeric repeat amplification protocol (TRAP) assay for telomerase activity lacks quantitative precision.
• Accurate measurement of telomerase activity is crucial for understanding cancer biology.

Purpose of the Study:

• To develop a novel quantitative assay for telomerase activity.
• To improve the precision and sensitivity of existing telomerase detection methods.
• To enable more accurate analysis of telomerase in cancer cells and tumors.

Main Methods:

• Modified the primer extension method of the conventional TRAP assay.
• Utilized a lysis buffer for complete nuclear lysis and phenol/chloroform extraction to remove PCR inhibitors.
• Designed internal standard primers to minimize competition with telomerase products during PCR.

Main Results:

• The modified assay demonstrated a strong correlation between telomerase amount and activity (r2 = 0.99).
• Achieved significantly higher sensitivity (5.5-fold in cancer cells, >5.9-fold in tumors) and lower variability compared to conventional TRAP.
• Enabled a broader linearity range and the use of a nonradioactive detection method.

Conclusions:

• A precise and sensitive quantitative assay for telomerase activity has been successfully developed.
• This new method is applicable to cultured human cancer cells and patient tumors.
• The enhanced assay provides a valuable tool for cancer research and diagnostics.