We have developed a rapid, sensitive, and reliable method based on Real-Time RT-PCR for measuring mRNA half-life. The t 1/2 value obtained for Nalm-6 is comparable to those estimated from Northern blot studies, using normal human leukocytes (5.5 h). Using this method, the β-actin mRNA exhibited a half-life of 6.6 h and 13.5 h in Nalm-6 and CCRF-CEM cells, respectively. To generate the standard curve, serial ten-fold dilutions of the pBactin-231 vector containing the cDNA amplified fragment were employed, β-actin mRNAs were quantified by Real-Time RT-PCR using the SYBR ® Green I fluorogenic dye and data analyzed using the iCycle iQ system software. One μg of total RNA was reverse transcribed and used as template for the amplification of a region of the β-actin gene (231 bp). Total RNA was isolated and quantified using the RiboGreen ® fluorescent dye with the VersaFluor Fluorometer System. Human leukemia Nalm-6 and CCRF-CEM cells were treated with various concentrations of Actinomycin D to block transcription and aliquots were removed periodically. This approach was evaluated by using the β-actin gene as a reference molecule for measuring of mRNA stability. We describe an alternative method to determine mRNA half-life (t 1/2) based on the Real-Time RT-PCR procedure.
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