Real-Time PCR Data Processing Shown by the Analysis of Colorectal Specific Candidate Genes, ERCC1, RRM1 and TS in Relation to β2M as Endogenous Control
Open Access
- 24 February 2012
- journal article
- research article
- Published by MDPI AG in Applied Sciences
- Vol. 2 (1), 139-159
- https://doi.org/10.3390/app2010139
Abstract
Currently, quantitative real-time PCR (Q-PCR) of archival formalin-fixed, paraffin embedded (FFPE) tissue is a critical tool for research and is not well established in routine diagnostics. Therefore, continuous improvement in mathematics and statistics associated with interpreting final accurate and reproducible results are fundamental. This project describes and discusses specificity and sensitivity with respect to intra- and inter-assay variances by use of a commercial Human Reference RNA and individual RNA derived from colorectal cancer patients (n = 25). All patients were treated with 5-fluoruracil (5-FU) and a concomitant pelvic radiotherapy (50.4 Gy). Quality assessment of target tissue samples was evaluated by clinicopathological findings and optical density (OD) measurements. We analyzed the steady state messenger RNA (mRNA) expression level of a small panel of cancer relevant genes, excision repair cross-complementing group 1 (ERCC1), ribonucleoside-diphosphate reductase subunit M1 (RRM1), thymidylate synthase (TYMS) and ß-2microglobulin (ß-2M) as endogenous control. The mRNA of a Human Reference RNA, tumor and non-neoplastic material was reverse transcribed into its complementary DNA (cDNA). cDNA was amplified based on dual-labeled TaqMan real-time fluorescence measurements. The real-time efficiency and therefore the output data can be influenced through the kind of calibrator used, the amount and quality of used RNA and by the degree of individual assay variability. Each sample presents an individual amplification curve. Thus, confirmation of primer specificity, one or more invariant endogenous controls, RNA and cDNA quality, as well as real-time PCR amplification efficiencies and linearity calculations from individual slopes or R2-values must be included in each study.This publication has 12 references indexed in Scilit:
- Evaluation of real-time PCR endogenous control genes for analysis of gene expression in bovine endometriumBMC Molecular Biology, 2009
- A novel G/C single-nucleotide polymorphism in the double 28-bp repeat thymidylate synthase alleleThe Pharmacogenomics Journal, 2006
- RNA integrity and the effect on the real-time qRT-PCR performanceMolecular Aspects of Medicine, 2006
- Analysis of pigmented villonodular synovitis with genome‐wide complementary DNA microarray and tissue array technology reveals insight into potential novel therapeutic approachesArthritis & Rheumatism, 2006
- Quantification of mRNA using real-time reverse transcription PCR (RT-PCR): trends and problemsJournal of Molecular Endocrinology, 2002
- Analysis of Relative Gene Expression Data Using Real-Time Quantitative PCR and the 2−ΔΔCT MethodMethods, 2001
- A new mathematical model for relative quantification in real-time RT-PCRNucleic Acids Research, 2001
- Pathological features of rectal cancer after preoperative radiochemotherapyInternational Journal of Colorectal Disease, 1997
- Thymidylate synthase mRNA level in adenocarcinoma of the stomach: a predictor for primary tumor response and overall survival.Journal of Clinical Oncology, 1996
- Enzyme Activity in Invasive Tumors of Human Breast and ColonProceedings of the National Academy of Sciences of the United States of America, 1974