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Quantitative real time pcr

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Quantitative real-time PCR (qPCR) is a laboratory technique used to amplify and quantify specific DNA or RNA sequences. It measures the amount of target genetic material in a sample as the reaction progresses in real-time. The core function of qPCR is to provide precise and sensitive quantification of nucleic acid targets.

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25 protocols using quantitative real time pcr

1

Liver RNA Extraction and qPCR Analysis

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Total RNA was isolated from the liver by Trizol (Invitrogen, Carlsbad, CA) extraction. In brief, liver samples were homogenized, and the resulting homogenized mixture was separated using a chloroform solution. The supernatant was removed, and RNA was precipitated using sodium acetate and isopropanol. The RNA pellet was purified using a series of ethanol washes and the pellet was dissolved in RNAse free water. RNA was converted to cDNA using a commercially available kit (Quanta Bioscience, Beverly, MA). cDNA samples of 25 ng were subjected in duplicate to real-time quantitative PCR (Bio-Rad, Hercules, CA). For each target gene, the average expressed isoform was expressed relative to a housekeeping gene (18s) and the relative fold change was calculated using the comparative ΔΔCt method (Livak & Schmittgen, 2001 (link)). Primer sequences were derived from Mus musculus (National Center for Biotechnology Information GenBank).
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2

Quantitative PCR Analysis of mRNA

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For all RNA analyses, the total RNA was isolated from treated or non-treated cells using Trizol reagent (Invitrogen), treated with RQ1 RNase-Free DNase (Promega, Madison, WI) to remove residual DNA, and cDNA was synthesized using 2 μg of total RNA as a template, random hexamers, and M-MuLV reverse transcriptase (NEB). We measured relative mRNA abundance by real time quantitative PCR (BioRad, Hercules, CA) with SYBR green as the fluorescent dye. Each sample was measured in triplicate and normalized to Rpl19 mRNA levels. The primers for mouse Rpl19, Blos1 and Scar3 were previously described (Hollien et al., 2009 (link)).
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3

Liver RNA Expression Analysis

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The liver samples were stored at −80 °C for RNA extraction. The total liver RNA was extracted using RNAiso Plus (9108, Takara, Otsu, Japan) by following the manufacturer’s instructions. cDNA was synthesized simultaneously using 1 ug of RNA with the Prim-Script TM RT Reagent Kit (9108, Takara, Japan) and the SYBR Premix Ex Taq TM II Kit (9108A, Takara, Japan). The expression levels of Nrf2, HO-1, CAT, GSH-Px, and SOD-1 were detected by real-time quantitative PCR (Bio-Rad, Hercules, CA, USA). β-actin was applied as a housekeeping gene for normalization. The RNA expression levels were calculated using the 2−ΔΔCT method [30 (link)]. The primers used in this study were designed by PREMIER 5 (PREMIER Biosoft International, Palo Alto, CA, USA) and are shown in Supplementary Data Table S1.
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4

Lentiviral knockdown of Apobec genes

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Constructs containing pLKO1 nontarget control short hairpin RNA (shRNA; SHC016), Apobec1-targeting shRNA (TRCN0000311145), Apobec2-targeting shRNA (TRCN0000112015), or Apobec3-targeting shRNA (TRCN0000197906) were used. We produced lentiviruses via cotransfection of pCMV-d8.91, pVSV-G, and pLKO1 into HEK293T cells using Lipofectamine 3000 (Thermo Fisher Scientific, L3000015). Transduction was carried out according to the standard protocol of the ENCODE consortium. Briefly, viruses were collected from conditioned media after 48-hour cotransfection. Lentivirus-containing medium was mixed with the same volume of DMEM containing polybrene (8 μg/ml), which was used to infect N2a cells. After 24 hours, cells were incubated with puromycin (3 μg/m) for 24 hours. Knockdown efficiency was evaluated by real-time quantitative PCR (Bio-Rad).
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5

Validation of AFP Regulatory Genes

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We used real-time quantitative PCR (Bio-Rad®, Hercules CA) to validate four hub genes that affected AFP level. The genes were selected by their significance levels and functional relevance. Paired t-tests were used to test for significance. A detailed description of the qRT-PCR method is presented in the Supplementary materials.
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6

Quantifying Hepatic Antioxidant Gene Expression

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The livers samples were stored at −80°C for RNA extraction. Hepatic total RNA was extracted by RNAiso Plus (9108, Takara, Otsu, Japan) following the manufacture's instructions. cDNA was synthesized using one microgram of RNA concurrently with the Prim-ScriptTM RT reagent Kit (9108, Takara, Japan) and SYBR Premix Ex TaqTM II kit (9108A, Takara, Japan). The RNA expressions, including Nrf2, HO-1, GST, GSH-Px, SOD1, CAT, and NQO-1, were quantified by Real-Time quantitative PCR (Bio-Rad, USA). β-actin was used as the house-keeping gene to normalize the gene expression, and the 2-ΔΔCT method was used for calculation of the RNA expression levels (34 (link)). The primers (Table 1) were designed by using of Premier 5 (PREMIER Biosoft International, Palo Alto, CA) and synthesized by Qingke BioTech Co., Ltd (33 (link)).
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7

Quantitative Analysis of Cytokine Expression

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Total RNA was isolated following a previously described protocol from liver and kidneys [21 (link)]. Reverse transcription to cDNA was performed with iScript Select cDNA synthesis kit (Bio-Rad Laboratories) using the following thermal cycle: 5 min at 25°C, 30 min at 45°C and 8 min at 85°C. The mRNA expression levels of cytokines were analyzed with SYBR green technology in quantitative Real-Time PCR (Biorad) on a Bio-RAD CFX96 system. Gene expression was normalized relative to a housekeeping gene as previously described [25 (link)].
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8

Cardiac RNA Expression Profiling

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Total RNA was extracted from cardiac tissue and cells using TRIzol™ reagent (Invitrogen, USA) according to the manufacturer’s instructions. For reverse transcription of miRNA, 1 μg of total RNA was used as the template, together with the Bulge-Loop™ miRNA RT Primer (5 μM) (RIBOBIO, China). For reverse transcription, 1 μg of total RNA was used for synthesis of first-strand cDNA with the iScript™ cDNA Synthesis Kit (Bio-Rad, USA). The mRNA level of CACNA1S and RyR2 was analyzed by quantitative real-time PCR (Bio-Rad) using the iScript™ One-Step RT-PCR Kit with SYBR® Green (Bio-Rad) in a total volume of 20 μL and the gene-specific primers in Additional file 1: Table S1. To assess the expression of miR-24, 10 ng of cDNA product were subjected to real-time PCR amplification using the Bulge-Loop™ miRNA Forward and Reverse Primers (RIBOBIO, China). The thermocycling program was 95 °C for 5 min, followed by 40 cycles of 95 °C for 15 s, 60 °C for 30 s, and 72 °C for 30 s, with a final dissociation step to ensure the specificity of amplification. Each sample was assayed in triplicate. The small nuclear RNA U6 was used as the control for quantification of the miR-24 level, and GAPDH for quantification of the CACNA1S and RyR2 mRNA levels.
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9

Quantitative RT-PCR Analysis of Deup1 and Cep63

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Total RNA from cells and tissues was extracted with Trizol Reagent (Thermo Fisher Scientific) following the manufacturer’s protocol. SuperScriptIV reverse transcriptase (ThermoFisher Scientific) was used for cDNA synthesis. The cDNA was then used for quantitative real-time PCR (BioRad), using SYBR Green qPCR mastermix reagent (ThermoFisher Scientific). The following primers were used:
Deup1 (deleted exons)
For: 5’- GCC AGA TGT AGA CAT TTC TTG GCA TGG −3’
Rev: 5’- CCC ACC TCC TGG CCT TT −3’
Deup1 (exons 10–12):
For: 5’- TAC GTC TTC CAG AGC CAG C −3’
Rev: 5’- CAG GAA GTG CTG TGC AGC −3’
Deup1 (exons 9–10):
For: 5’- GAA TTA AGC AAG GCT GTG GAC T −3’
Rev: 5’- CTC TGG AAG ACG TAT GCC CC −3’
Cep63 (exons 6–8):
For: 5’- ATC AGA CCT ACA GTT CTG CC −3’
Rev: 5’- CTG ACT TAG AAT CTC CTT ATG CTC −3’
Cep63 (exons 13–14):
For: 5’- GCA GGA GGA ATT AAG CAG ACT −3’
Rev: 5’- CTG TCG GAA TTC CTC TAT TTT TCC AG −3’
GAPDH:
For: 5’- AAT GTG TCC GTC GTG GAT CTG A −3’
Rev: 5’- GAT GCC TGC TTC ACC ACC TTC T −3’.
All samples were normalized to GAPDH (ΔCt). The relative fold change in mRNA expression as quantified using the 2−ΔΔCt method comparing experimental samples to controls. All data was then normalized to the average value for the control samples.
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10

Time-Dependent MPP+ Experiment: MHC-I Expression

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In the MPP+ time-dependent experiment, total RNA was harvested from the treated cells at 0, 12, 24, and 36 hours using RNAiso Plus (Takara Bio, Kusatsu, Japan). For the other experiment, total RNA was extracted from the cells at 24 hours. To equalize the RNA concentrations, the NanoDrop ND-2000 Spectrophotometer (Thermo Fisher Scientific, Wilmington, DE, USA) was used to test and adjust the RNA concentrations to the same levels. To assess mRNA expression, 1 μg of total RNA was obtained to reverse transcript its complementary DNA using the PrimeScript™ RT Reagent Kit with gDNA Eraser (Takara Bio). MHC-I expression was tested using quantitative real-time PCR (Bio-Rad, Hercules, CA, USA) with SYBR® Premix Ex Taq™ II. Beta-actin was used as the control. The sequences of the MHC-I RT-PCR primers are provided in Additional Table 2.
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