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Forward and reverse primer

Manufactured by Biomers
Sourced in Germany

Forward and reverse primers are short, synthetic DNA sequences used in various molecular biology techniques, such as polymerase chain reaction (PCR). They serve as the starting points for DNA synthesis, allowing the targeted amplification of specific DNA regions. The forward primer binds to the sense strand, and the reverse primer binds to the complementary antisense strand, enabling the DNA polymerase to replicate the target sequence between them.

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7 protocols using forward and reverse primer

1

mRNA Extraction and qPCR Analysis

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We extracted mRNA with Trizol isolation using Qiazol Lysis Reagent and a bead mill. RNA had to be concentrated by vacuum centrifugation and concentrations were measured by spectrophotometry with NanoDrop 1000 (PeqLab, Germany). RNA integrity was tested with automated electrophoresis with Experion Automated Electrophoresis System (Bio-Rad Laboratories, USA). Next, RNA was transcribed into cDNA with RevertAid First Strand cDNA Synthesis Kit (Fermentas, USA). PCR reactions were performed on Rotor-Gene Q (QIAgen, Germany) in a total reaction volume of 20 μL with Brilliant II SYBR Green qPCR Master Mix (Stratagene, USA) and forward and reverse primers (Biomers, Germany). Expression analyses were performed as reported31 (link). Primer sequences and complete methods are given in the supplemental section (supplementary methods and Suppl. Table 1).
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2

HotStarTaq DNA Polymerase PCR Protocol

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A HotStarTaq DNA polymerase kit was obtained from Qiagen (Hilden, Germany). The DNA template was diluted to a final concentration between 10 and 50 ng/µL in water. A volume of 29.3 µL water, 5 µL PCR buffer, 10 µL Q-Solution, 0.5 µL dNTPs (10 mM each), 1 µL 25 µM forward and reverse primers (Biomers, Ulm, Germany), 0.2 µL HotStar Taq polymerase, and 2.5 µL DNA template were mixed together. Primer sequences are listed in Table 3. Following an initial denaturation for 15 min at 95 °C, 35 cycles of denaturation (1 min, 95 °C), annealing (1 min, primer pair-specific annealing temperature), and elongation (1 min 72 °C) were performed. Final elongation was performed for 10 min at 72 °C.
The PCR products were purified using the MSB® Spin PCRapace kit (Invitek Molecular, Berlin, Germany), according to the manufacturer’s instructions.
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3

Quantitative Real-Time PCR Analysis

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RNA was isolated as previously described. 1 µg RNA was transcribed to cDNA using SuperScript II Reverse Transcriptase (Thermo Fisher Scientific, San Diego, USA). For final measurements 2.5 µl cDNA (1:10), 0.25 µl forward and reverse primer (Biomers, Ulm, Germany), 2.0 µl water and 5.0 µl LightCycler 480 SYBR Green I Master reaction mixture (Roche, Penzberg, Germany) was mixed. After incubation for 5 min at 95°C, gene expression was determined by performing 45 cycles of denaturation (95°C, 10 s), annealing (specific annealing temperature, 15 s) and elongation (72°C, 20 s). Thereafter melting curve analysis was done. Quantitative real-time PCR (qPCR) was performed using LightCycler 480 (Roche, Penzberg, Germany) under conditions described in Table 2. As IGFBP3 and GDF11 showed aberrant or ambiguous serum concentrations, relative mRNA expression levels were measured and normalized to relative β-actin (β-ACTIN), glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and β2-micro-globulin (β2M) mRNA expression. Results were calculated using delta-delta Ct method considering PCR efficiency. Technical triplicates were performed for each biological sample.
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4

Quantitative Real-Time PCR Analysis

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An amount of 1 µg total RNA was transcribed using SuperScript II Reverse Transcriptase (Thermo Fisher Scientific, Waltham, MA, USA) for complementary DNA (cDNA) synthesis. The qRT-PCR measurements were performed with reaction mixtures containing 5 µL LightCycler 480 SYBR Green I Master reaction mixture (Roche, Basel, Switzerland), 0.25 µL 25 µM forward and reverse primer (Biomers, Ulm, Germany), 2 µL water, and 2.5 µL 1:10 diluted cDNA. Primer sequences are listed in Table 2. Amplification and detection were accomplished on a LightCycler 480 Instrument II system (Roche, Basel, Switzerland). The PCR program included initial incubation for 5 min at 95 °C, 45 cycles of denaturation (95 °C, 10 s), annealing (specific annealing temperature, 15 s), and elongation (72 °C, 20 s). Following amplification, a melting curve analysis was performed. Relative mRNA gene expression was normalized on the relative succinate dehydrogenase complex flavoprotein subunit A (SDHA), hydroxymethylbilane synthase (HMBS), and ribosomal protein L13 (RPL13) gene expression was calculated based on the delta-delta Ct method considering PCR efficiency and internal calibration. Each condition was measured in biological and technical triplicates.
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5

cDNA Synthesis and qPCR Analysis

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A total of 1 µg RNA was transcribed into cDNA by using the SuperScript II Reverse Transcriptase (Thermo Fisher Scientific, San Diego, CA, USA), as described by the manufacturer. Regarding all gene expression measurements, 2.5 µL cDNA (1:10 diluted in water), 0.25 µL forward and reverse primer (Biomers, Ulm, Germany) with a final concentration of 25 µM, 2 µL water and 5 µL LightCycler 480 SYBR Green I Master reaction mixture (Roche, Penzberg, Germany) were used. The protocol for quantitative real-time PCR (qPCR) is shown in Table 2. The mRNA expression of the genes ß-actin (ACTB), glyceraldehyde-3-phosphatase-dehydrogenase (GAPDH) and ß2-microglobulin (ß2M) were used for normalization. Finally, a melting curve was measured after amplification for the analysis of purity. Three technical replicates were performed for each biological sample. All measurements were carried out by using a LightCycler480 (Roche, Penzberg, Germany). The ΔΔCt method, considering PCR efficiency, was used for the calculation of relative mRNA expression. All sequences of the primer used for qPCR are listed in Table S1.
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6

Quantifying mRNA Levels by qPCR

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For cDNA synthesis, 1 µg RNA was transcribed into cDNA using SuperScript II Reverse Transcriptase (Thermo Fisher Scientific, Waltham, MA, USA). For p27, p53, p21, LMNB1, IL6, MCP1 and ICAM1 2.5 μL cDNA (1:10), 0.25 μL forward and reverse primer (Biomers, Ulm, Germany), 2.0 μL water and 5.0 μL LightCycler 480 SYBR Green I Master reaction mixture (Roche, Penzberg, Germany) was mixed for each measurement. After an initial incubation for 5 min at 95 °C, the qPCR protocol involves 45 cycles of denaturation (95 °C, 10 s), annealing (specific annealing temperature, 15 s) and elongation (72 °C, 20 s). Relative mRNA expression of measured targets was normalized to relative β-actin (β-ACTIN), glyceraldehyde-3-phosphate-dehydrogenase (GAPDH) and β2-microglobulin (β2M) mRNA expression. After amplification, melting curve analysis was performed. Measurements of gene expression were conducted using LightCycler 480 (Roche, Penzberg, Germany). Relative mRNA expression was calculated using the delta-delta Ct method considering PCR efficiency. Technical triplicates were done for each biological sample. Sequences of forward and reverse primers can be found in Table 3.
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7

Gene Expression Analysis by qPCR

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SuperScript II Reverse Transcriptase (Thermo Fisher Scientific, San Diego, CA, USA) was used to transcribe 1 µg RNA into cDNA. For all gene expression measurements, 2.5 μL cDNA (1:10), 0.25 μL forward and reverse primer (Biomers, Ulm, Germany) with a final concentration of 25 µM (except IL6: 20 µM), 2.0 μL water and 5.0 μL LightCycler 480 SYBR Green I Master reaction mixture (Roche, Penzberg, Germany) were mixed. The qPCR protocol involves an initial incubation for 5 min at 95 °C and 45 subsequent cycles of denaturation (95 °C, 10 s), annealing (specific annealing temperature, 15 s) and elongation (72 °C, 20 s). β-actin (ACTB), glycerinaldehyde-3-phosphate-dehydrogenase (GAPDH) and β2-microglobulin (β2M) mRNA expression was used for normalization. Melting curve analysis was done after amplification and technical triplicates were performed for each biological sample. Measurements were carried out using a LightCycler 480 (Roche, Penzberg, Germany). Relative mRNA expression was calculated using the delta delta Ct method considering PCR efficiency. Sequences of the primers used for qPCR are listed in Table 2.
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