期刊
ANALYTICAL BIOCHEMISTRY
卷 278, 期 2, 页码 175-184出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/abio.1999.4461
关键词
dihydropyrimidine dehydrogenase; quantitative RT-PCR; TaqMan; real-time PCR; pharmacogenetics; pharmacogenomics
Several recent studies have reported a correlation between intratumor dihydropyrimidine dehydrogenase (DPD) messenger RNA (mRNA) levels and sensitivity to 5-fluorouracil (5-FU). However, significant tissue requirements and labor-intensive methodology have limited the large-scale studies necessary for statistical validation. In addition, the semiquantitative results obtained by these methods further limit their application, We have developed a realtime reverse transcription-PCR (RT-PCR) assay, based on TaqMan fluorescence methodology, capable of rapid and accurate quantitation of DPD mRNA levels in biopsy-sized tissue samples. Results obtained with this approach indicate a linear dynamic range of 10(8)-10(8) DPD mRNA copies, with an intraassay variation of <5%. We evaluated the data using three different methods (absolute standard curve, relative standard curve, and comparative C-T) and show them to be equivalent. This RT-PCR assay was validated by quantitative comparison to Northern blot analysis in five tissues. In addition, analysis of 18 colorectal tumor and liver tissue specimens demonstrated a significant correlation (r(2) = 0.90) between DPD enzyme activity and mRNA levels. This method provides the first high-throughput, reproducible, and sensitive technique capable of determining DPD mRNA expression levels in nanogram amounts of total RNA, (C) 2000 Academic Press.
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