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82 protocols using pyromark gold q96 reagent

1

Validation of Somatic Mutations by Pyrosequencing

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The pyrosequencing technique was used for validation of specific discovered single base substitution-type mutations (NOTCH2 C7310T, SMYD1 G839T, MYD88 T794C, ZNF608 A3659G, PDE10A G1072A) in a validation cohort of 24 microdissected SMZL samples. An internal fragment of each gene was amplified by polymerase chain reaction (PCR) using primers specific for each gene and a PyroMark PCR kit (QIAGEN). The resulting PCR products were sequenced with the PyroMark Q24 (QIAGEN) pyrosequencer using PyroMark Gold Q96 reagents (QIAGEN) and sequencing primers specific for each gene.
Conventional Sanger sequencing was used to screen for mutations in two selected genes within the validation cohort (NOTCH2 and SMYD1). The PEST domain of NOTCH2 within exon 34 and all 10 exons of SMYD were sequenced in 8 validation and 2 WES cases. Primer sequences are given in Additional file 2: Table S2; Additional file 3: Table S3; Additional file 4: Table S4.
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2

Quantifying DNA Methylation in T Cells

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Genomic DNA from ex vivo isolated or in vitro cultivated T cells, as well as other ex vivo isolated immune cell subsets was bisulfite converted by using the EZ DNA Methylation Kit (Zymo Research). Validated candidate regions from MS-HRM analysis were amplified by PCR containing 10 ng of bisulfite-converted genomic DNA, HotStar Taq PCR buffer (Qiagen), 1 U HotStar Taq DNA polymerase, 2.5 mM MgCl2 and 0.38 μM each of forward and reverse primers (Supplementary Table S1) in a final volume of 50 μl (95°C for 15 min; 50 cycles: 95°C for 30 s, 57°C for 1 min, 72°C for 1 min; 72°C for 7 min). The PCR product was analyzed by gel electrophoresis. 20–40 μl of the PCR product, Pyromark Gold Q96 reagents (Qiagen), Pyromark buffers (Qiagen), Streptavidin Sepharose (GE Healthcare) and sequencing primers (Supplementary Table S1) were used for pyrosequencing on a PSQ96MA (Qiagen) according to the manufacturer's protocol. Significance of methylation rate differences between compared subsets was calculated using Prism (GraphPad Software) and a two-way ANOVA with Bonferroni's multiple comparisons test. Locations of analyzed CpG motifs in mouse genome GRC38m are listed in Supplementary Table S2.
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3

Parental Allelic Expression Quantification

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Parental allelic expression quantification was performed by pyrosequencing. Streptavidin Sepharose High-Performance beads (GE healthcare) dissolved in binding buffer (10 mM Tris-HCL pH7.6, 2 M NaCl, 1 mM EDTA, 0.1% Tween-20) were shaken with the qPCR product at 1400 rpm for 20 min. The biotinylated strand was purified using a PyroMark Q96 Vacuum Workstation (QIAGEN) then sequencing primers annealed in annealing buffer (20 mM Tris-acetate pH7.6, 2 M magnesium acetate) at 85 °C for 3 min. Sequencing was performed on a PyroMark Q96 MD pyrosequencer (Qiagen) using PyroMark Gold Q96 Reagents (Qiagen). The mean expression bias from three or four biological replicates of tissue was then calculated. Genomic DNA was also assessed to identify any amplification bias from the primers and all assays were corrected for this bias.
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Exon 7 Splicing Ratio Analysis

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The ratio of correctly vs. alternatively spliced exon 7 in the transfected cell lines with hepatic origin and human liver samples was analyzed using pyrosequencing. Spliced exon 7 from minigene experiments and from cDNA from human liver samples was amplified using primer pair 7 (minigene) and primer pair 8 (liver samples) listed in Supplementary table S1. Samples were prepared using PyroMark™ Binding and Annealing Buffer (QIAGEN) and the PyroMark™ Vacuum Prep Station (Biotage, Uppsala, Sweden). Pyrosequencing was carried out on the PyroMark™ Q96 ID (Pyrosequencing AB, Uppsala, Sweden) with PyroMark™ Gold Q96 reagents (QIAGEN) using the primer 9 (minigene) and primer 10 (liver samples).
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5

Quantitative DNA Methylation Analysis

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Purified genomic DNA from tissue samples was used for global long interspersed nucleotide element-1 (LINE-1) and miR-137 promoter methylation analyses. The procedure was in detail described in our previous reports36 (link),40 (link). Briefly, we applied Cells-to-CpG Bisulfite Conversion Kit (Life Technologies, Carlsbad, CA) for bisulphite modification, thereafter the standard PCR with biotin-labelled primers and eventually the pyrosequencing on PyroMark Q96 ID (Qiagen) using PyroMark Gold Q96 reagents (Qiagen). The mean methylation level of analysed CpG motifs was used for quantitative methylation analysis.
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6

Quantitative DNA Methylation Analysis

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DNA was extracted from the same tissue samples pretreated with QIAzol Lysis reagent and chloroform according to the manufacturer's protocol (provided by QIAGEN). Purified genomic DNA was bisulfite modified using the Cells-to-CpGTM Bisulfite Conversion Kit (Life Technologies, Carlsbad, CA) following the manufacturer's protocol, as described previously (17 (link),18 (link)). Briefly, quantitative methylation analyses of long interspersed nucleotide element 1 (LINE-1) were performed by bisulfite pyrosequencing on PyroMark Q96 ID (QIAGEN) using PyroMark Gold Q96 reagents (QIAGEN). For further quantitative methylation analysis, we used the mean methylation level of analyzed CpG sites.
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7

Bisulfite Conversion and Pyrosequencing Protocol

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Bisulfite converted DNA was initially subjected to PCR amplification. Primers were purchased at Metabion and the sequences are provided in Supplementary Table S2, as described before17 (link). 20 µl PCR products were subsequently immobilized to 5 µl Streptavidin Sepharose High Performance Bead (GE Healthcare, Piscataway, NJ, USA), and were finally annealed to 1 µl sequencing primer (5 μM) for 2 min at 80 °C. Amplicons were sequenced using PyroMark Gold Q96 Reagents (Qiagen) on PyroMark Q96 ID System (Qiagen, Hilden, Germany) and analyzed with PyroMark Q CpG software (Qiagen). The relevant sequences are depicted for the five relevant genomic regions in Supplementary Fig. S4. The 15 CpG model for pyrosequencing data, which was trained by lasso regression with the lambda parameter chosen by cross-fold validation, has been described before17 (link) and is provided in Supplementary Table S3.
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8

LINE-1 DNA Methylation Analysis

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Bisulfite conversion of purified genomic DNA was performed using Cells-to-CpG™ Bisulfite Conversion Kit (Life Technologies) according to the manufacturer’s protocol. After PCR using biotin-labeled LINE-1 region primers, the success of reaction was verified in agarose gel (1%) electrophoresis and no-template controls. For quantitative methylation analyses we used bisulfite pyrosequencing of LINE-1, which was performed on PyroMark Q96 ID (QIAGEN) using PyroMark® Gold Q96 reagents (QIAGEN) according to manufacturer’s instructions. As previously described, we accessed LINE-1 X58075 103–249 bp region with mean of 4 CpG-sites38 (link), 39 (link). LINE-1 primers: forward TTTTGAGTTAGGTGTGGGATATA, reverse 5′-biotin-AAAATCAAAAAATTCCCTTTC and pyrosequencing AGTTAGGTGTGGGATATAGT. Briefly, biotin-labeled PCR products were first captured on streptavidin-coated magnetic beads and then underwent pyrosequencing procedure. Mean methylation level of 4 measured CpG sites was used for the further analyses. Samples with poor DNA quality and/or repeatedly insufficient bisulfite conversion were excluded from further analyses.
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9

Bisulfite-based DNA Methylation Analysis

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DNA (0.5–1 µg) was bisulphite treated using the two-step protocol of the Imprint DNA Modification Kit (Sigma). The Dlk1 sDMR region was amplified from bisulphite converted DNA through PCR with HotStarTaq DNA Polymerase (Qiagen) (primer sequences provided below). PCR products were shaken at 1,400 rpm with Streptavidin Sepharose High Performance beads (GE healthcare) in binding buffer (10 mM Tris-HCl pH7.6, 2 M NaCl, 1 mM EDTA, 0.1% Tween-20) for 20 min. The biotinylated strand of the product was purified using the PyroMark Q96 Vacuum Workstation (Qiagen). The sequencing primer was annealed to the template in annealing buffer (20 mM Tris-acetate pH7.6, 2 M magnesium acetate) at 85 °C for 4 min. Sequencing was performed with the PyroMark Q96 MD pyrosequencer (Qiagen) using PyroMark Gold Q96 Reagents (Qiagen).
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10

Quantifying E-cadherin Promoter Methylation

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CpG methylation of the promoter region of the E‐cadherin gene was quantified by pyrosequencing. The EpiTect Bisulfite Kit (Qiagen, Germany) was used for bisulphite conversion of genomic DNA. The PyroMark Gold Q96 Reagents and the PyroMark Q96 ID instrument (Qiagen, Germany) were used for pyrosequencing according to the manufacturer's instructions. Seven total CpG sites were analysed per sample.
Pyro Q‐CPG (Biotage, SWEDEN) was used to analyse the methylation status of each Site. Pyrosequencing primers were designed using PYROMARK assay design software 2.0 (Qiagen, Germany). The primers for the analysis of E‐cadherin CPG regions were as follows (5′ biotin modification): FORWARD, 5′‐GGGTTGGGATTAGAATTTAGTGGAATTA‐3′; REVERSE, 5′‐ATTCACCTACCCACCACAACCAATCAACAA‐3′ and S, 5′‐ATTTTAGGTTAGAGGGTTAT‐3′.
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