Publication protocol
RNAs were isolated using TRIzol (Thermo Fisher Scientific) or RNeasy 96 Kits (Qiagen) according to protocols supplied by the manufacturers. TaqMan One-step qRT-PCR was performed using AgPath-ID™ One-Step RT-PCR Reagents (Thermo Fisher Scientific). Briefly, total RNAs (50–100 ng) in 5 μl nuclease-free water were mixed with 0.3 μl primer probe sets containing forward and reverse primers (10 μM of each) and fluorescently labeled probe (3 μM), 10 μl 2 × RT-PCR Buffer, 0.8 μl 25 × RT-PCR Enzyme Mix, 1.7 μl Detection Enhancer and 2.2 μl nuclease-free water in a 20 μl reaction. Reverse transcription was performed at 45°C for 10 min, the reactions were then denatured at 95°C for 10 min, and forty cycles of PCR reactions were conducted at 95°C for 15 s and 60°C for 60 s within each cycle, using Applied Biosystems StepOnePlus Real-Time PCR system. Expression levels of target RNA were normalized to total RNA quantified using Quant-iT RiboGreen RNA Reagent (Thermo Fisher Scientific). Primer-probe sets for human (Hs00161407_m1), human (Hs00243257_m1), mouse (Mm01303209_m1), and mouse (Mm00457866_m1) mRNAs were purchased from Thermo Fisher Scientific. Primer sequences for quantification of mRNA precursor (NCL1 pre-mRNA) are: forward, 5′-CTC TGT CAC TGG TAT CTT TTC CC-3′; reverse, 5′-CAA AAC CAA ACC TAG AAC ACC AAA TG-3′; and probe, 5′-CAA GGC TAC TTT CTG TGG GAT GGC T-3′. Expression levels of 47S pre-rRNA precursor and mature 18S rRNA were examined using EXPRESS One-Step SYBR GreenER Kit (Thermo Fisher Scientific). Levels of 47S pre-rRNA precursor were normalized to the levels of 18S rRNA. Primer sequences for 47S pre-rRNA are: forward, 5′-TGT CAG GCG TTC TCG TCT C-3′ and reverse, 5′-AGC ACG ACG TCA CCA CAT C-3′. Primer sequences for 18S rRNA are: forward, 5′-GCA ATT ATT CCC CAT GAA CG-3′ and reverse, 5′-GGG ACT TAA TCA ACG CAA GC-3′. Northern analysis was performed as described previously (). Briefly, total RNAs (5 μg) were resolved on a 1% agarose gel buffered with 1 × MOPS and transferred onto a nylon membrane. Hybridization was performed at 42°C using 5′-end [γ-P] labeled oligonucleotide probes. The probe for detecting pre-rRNA spans the boundary between 18S and ITS1. Probe sequence: 5′-CCT CGC CCT CCG GGC TCC GGG CTC CGT TAA TGA TC-3′
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