Quantifying telomere transcripts as tool to improve risk assessment for genetic instability and genotoxicity

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Telomeres, composed of repetitive DNA sequences, protect chromosome ends and are crucial for genetic stability.
• Telomere length (TL) maintenance is vital for cell proliferation and chromosomal integrity.
• Telomere shortening is linked to aging, cancer risk, and cellular damage from factors like oxidative stress.

Purpose of the Study:

• To review quantitative PCR (qPCR) studies analyzing both TL and TERRA.
• To explore TERRA's role in protecting telomeres against reactive oxygen species (ROS).
• To assess the combined utility of TL and TERRA measurements in genotoxicity assessments.

Main Methods:

• Utilizing quantitative PCR (qPCR) to measure genomic DNA for TL.
• Applying qPCR to RNA converted to cDNA for quantifying TERRA levels.
• Comparing TL and TERRA measurements from various studies.

Main Results:

• qPCR is a versatile method for both TL and TERRA quantification.
• TERRA plays a role in telomere protection against ROS-induced damage.
• Fluctuations in TERRA levels may indicate short-term cellular responses to stress.

Conclusions:

• Simultaneous measurement of TL and TERRA provides a more comprehensive view of genotoxicity.
• TERRA transcript levels can serve as a sensitive, short-term biomarker of cellular stress.
• Integrating both DNA and RNA analyses improves the robustness of genotoxicity testing.