van Eekelen J A, Shammas F V, Wee L, Heikkilä R, Osland A
Department of Clinical Chemistry, Rogaland Central Hospital, Stavanger, Norway.
Clin Biochem. 2000 Aug;33(6):457-64. doi: 10.1016/s0009-9120(00)00155-7.
We developed a quantitative reverse-transcription polymerase chain reaction (RT-PCR) to determine CK20 expression in colorectal tumor and hematopoietic tissue.
Our method incorporates a calibrated PCR with an internal competitor and an external standard.
The RT-PCR assay is sensitive detecting 10 target molecules of CK20 in solution with one round of 38 amplification cycles. Genomic DNA contamination was eliminated by Dnase I digestion of total RNA. The inclusion of a calibrator in the quantitative RT-PCR analysis allowed for a high throughput of unknown samples within the same assay improving comparative analysis between the samples tested. Analysis of peripheral blood and bone marrow from 20 healthy volunteers revealed a low level of CK20 expression in all samples.
To study the clinical significance of CK20 expression as a marker of systemic metastatic disease it is essential to measure CK20 mRNA levels in hematopoietic tissue with sensitive quantitative RT-PCR. A sensitive and reproducible method, which is easily performed, is described.
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