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Semi-quantitative Detection of RNA-dependent RNA Polymerase Activity of Human Telomerase Reverse Transcriptase Protein
Published on: June 12, 2018
Quantitative and spatial measurements of telomerase reverse transcriptase expression within normal and malignant
William C Hines1, Alexandra M Fajardo, Nancy E Joste
1Department of Biochemistry and Molecular Biology, University of New Mexico School of Medicine, BMSB 249, Albuquerque, NM 87131-5221, USA.
Molecular Cancer Research : MCR
|September 24, 2005
Summary
Telomerase reverse transcriptase (TERT) is expressed in normal and cancerous breast epithelial cells. Elevated TERT mRNA levels in breast tumors correlate with higher grade and increased cell proliferation, suggesting its potential as a biomarker.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Telomerase reverse transcriptase (TERT) is crucial for telomere maintenance and cellular proliferation.
- TERT is expressed in most tumors and is a potential target for breast cancer diagnostics and therapeutics.
- Understanding TERT expression in normal and cancerous breast tissue is vital.
Purpose of the Study:
- To investigate the expression patterns and levels of TERT mRNA in human breast carcinomas and normal breast tissues.
- To identify the specific cell types expressing TERT mRNA within these tissues.
- To correlate TERT expression levels with clinicopathologic features of breast cancer.
Main Methods:
- Quantitative real-time reverse transcription-PCR was used to measure TERT mRNA levels in 36 breast carcinomas and 5 normal samples.
- In situ hybridization was employed to identify and characterize cells expressing TERT mRNA.
- Statistical analyses were performed to correlate TERT expression with tumor grade, cell proliferation (S phase fraction), and MYC mRNA levels.
Main Results:
- TERT mRNA expression is specific to epithelial cells in both normal and malignant breast tissues.
- TERT is expressed in both normal and cancerous breast tissues, with heterogeneous expression patterns.
- Approximately 75% of tumors showed TERT mRNA levels similar to or lower than normal tissue.
- Higher TERT mRNA levels in tumors were significantly associated with histopathologic grade 3, increased S phase fraction, and elevated MYC mRNA levels.
Conclusions:
- TERT expression is a feature of both normal and malignant breast epithelium.
- While heterogeneous, elevated TERT mRNA levels in breast tumors are linked to aggressive features.
- TERT warrants further investigation as a potential diagnostic and prognostic marker in breast cancer.
