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Lightcycler

Manufactured by Roche
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The LightCycler is a real-time PCR instrument manufactured by Roche. It is designed for the detection and quantification of nucleic acid sequences. The LightCycler utilizes fluorescent dyes or probes to monitor the amplification of DNA or RNA during the PCR process.

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1 119 protocols using lightcycler

1

Fluorescence Melting Curve Analysis

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Fluorescence melting curves were determined in a Roche LightCycler (Roche Diagnostics Ltd, Burgess Hill, UK), using a total reaction volume of 20 μl. For each reaction, the final oligonucleotide concentration was 0.25 μM, diluted in 10 mM sodium phosphate pH 7.4 containing 100 mM NaCl. The experiments used the duplexes 5′-F-AAAAGGATCCAAAA/5′-TTTTGGATCCTTTT-Q and 5′-F-AAAAGTATACAAAA/5′-TTTTGTATACTTTT-Q (F = fluorescein and Q = dabcyl). In a typical experiment the samples were first denatured by heating to 95 °C at a rate of 0.1 °C s -1 . The samples were then maintained at 95 °C for 5 min before annealing by cooling to 25 °C at 0.1 °C s -1 (this is the slowest heating and cooling rate for the LightCycler). They were held at 25 °C for a further 5 min and then melted by heating to 95 °C at 0.1 °C s -1 . Recordings of the fluorescence emission at 520 nm were taken during both the melting steps, as well as during annealing. The data were normalized to show the fractional change in fluorescence for each sample between the starting and final values. T m values were determined from the first derivatives of the melting profiles using the Roche LightCycler software.
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2

Quantitative RT-PCR Analysis of HO1 and Hepcidin

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HO1 and hepcidin (Hepc) hepatic mRNAs were measured by real-time quantitative RT-PCR as described previously [31] (link). Specific cDNA fragments were amplified using the following pairs of oligonucleotide primers: HO1, 5′-GTCGTGGTCAGTCAACATGG-3′ (forward) and 5′-TCTTGCCTGGCTCTCTTCTC-3′ (reverse); Hepc, 5′-CAATGTCTGCCCTGCTTTCT-3′ (forward) and 5′-TCTCCTGCTTCTCCTTG-3′ (reverse). The reactions were performed in a Light Cycler (Roche Diagnostics) and Light Cycler 3.5 Software was used for data analysis. Expression was quantified relative to that of a control transcript encoding glyceraldehyde-3-phosphate dehydrogenase [GAPDH; 5′-GACCACAGTCCATGCCATCAC-3′ (forward) and 5′-TCCACCACCCTGTTGCTGTAG-3′ (reverse)].
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3

Quantitative RT-PCR for Striatal Gene Expression

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Total RNA was obtained from the striatal tissues collected from each mouse according to the acid guanidinium thiocyanate-phenol-chloroform method [13 (link)]. Complementary DNA was obtained using 4 μg total RNA, 50 U M-MLV Reverse Transcriptase (Thermo Fisher Scientific, Waltham, MA, USA), and 50 pmol random primers, and subjected to quantitative PCR using a LightCycler (Roche, Basel, Switzerland). The amount of cDNA corresponding to 0.1 μg of original total RNA was used per reaction with the LightCycler Fast Start DNA Master SYBR Green I (Roche) and 1 μM gene-specific primers. Primer sequences used in the study are shown in Table 1. The amounts of sample mRNA were set relative to the control group using LightCycler software (Roche) and expressed as values normalized to the GAPDH level.
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4

qPCR Analysis of Innate Immune Genes

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mRNA isolated via TRAP was DNAse treated (Promega, M6101) for 30 min at 37°C. cDNA was synthesized using SuperScript III First-Strand Synthesis kit (ThermoFisher, 18080051) according to manufacturer specifications. Sybr green (Roche) qPCR master mix was used to quantify il1b, cxcl8a, cxcl8b.1, and tnfa gene expression in addition to rps11 expression as a normalization control (Table 1). qPCR reactions were run on a Lightcycler (Roche) and Cq values were quantified from Lightcycler software and normalized to housekeeping gene rps11.
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5

Sensitive Real-Time PCR Detection

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16S rRNA-and OspA-specific primers and probes, as described earlier (6, 22) . Real-time PCR with LightCycler ® (Roche, Basel, Switzerland) was also performed. Briefly, PCR reactions contained 10 µl 2×MasterMix of the DyNAmo Flash Probe qPCR Kit (ThermoFisher Scientific, Waltham, MA, USA), 1 µl 10 µM the corresponding forward and reverse primers, 0.5 µl 10 µM probe, and 100 ng template DNA in a total reaction volume of 20 µl. PCR cycling (60 cycles of 95°C 15 s, 60°C 1 min) was performed with a LightCycler instrument (Roche).
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6

Folate, Homocysteine, and DNA Methylation

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Plasma folate and homocysteine levels were measured using commercially available kits by fluorescence polarization immunoassay (Becton Dickinson, Franklin Lakes, NJ, USA) on an Abbott 130 AxSYM system (Becton Dickinson). Tissue folate was quantified using a microbiological assay by glycerol-protected Lactobacillus casei (BCRC®10697) in 96-well microtiter plates as previously described elsewhere [29 (link)]. Lymphocytic DNA was extracted using standard proteinase K digestion and the phenol–chloroform extraction procedure. The MTHFR C677T polymorphism was determined through RT-PCR and melting curve analysis by using a LightCycler instrument (Light-Cycler, Roche Diagnostics, Mannheim, Germany) as previously described [30 (link)]. Bisulfite modification of lymphocytic DNA was performed using the EpiTect PCR Control DNA set (Qiagen, Hilden, Germany), and the high-resolution melt-based PCR method was used to measure DNA methylation. Primers used for LINE-1 were F 5′-GCG AGG TAT TGT TTT ATT TGG GA-3′ and R 5′-CGC CGT TTC TTA AAC C-3′ to encompass eight CpG islands between primers and yield 141 bp of amplicon size. RT-PCR was conducted by use of a LightCycler instrument (Light-Cycler, Roche Diagnostics, Mannheim, Germany).
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7

Quantifying PRODH mRNA Expression

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Total RNA was isolated from human cell lines and breast tumor tissue samples from patients using TRIzol (Invitrogen, Carlsbad, CA) according to the manufacturer’s protocol. A LightCycler thermocycler (LC 2.0, Roche Molecular Biochemicals, Mannheim, Germany) was used for real-time quantitative PCR. PRODH mRNA fluorescence intensity was measured and normalized to β-glucuronidase expression using built-in software (Roche LightCycler version 4). The following primer sequences were used: PRODH primer sense sequence: 5′-GGATGCCTATGACAATG-3′ and PRODH primer antisense sequence: 5′-CCTTGGCGTTGTGCTTC-3′.
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8

Quantitative RT-PCR for Gene Expression

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Total RNA was extracted from cells and exosomes by the mirVana™ miRNA Isolation Kit (Ambion Inc.). Retrotranscription and amplification were performed using Transcription first-strand cDNA Synthesis Kit and LightCycler 480 SYBR Green I Master Kit in a Light-Cycler apparatus (Roche Diagnostics). For PCR Arrays analysis we used RT2 PreAMP CDNA Synthesis Kit and RT2 PreAMP Pathway Primer Mix for Stem Cell Transcription Factors and for Human Tumor Metastasis, in the appropriate PCR Arrays following the manufacturer's instructions (Qiagen). In the validation set, retrotranscription was achieved as described above. Next, we performed a specific pre-amplification using Real-Time Ready cDNA PreAMP Master using PreAMP Primer Pools, followed by Real-Time Ready Custom Panels in a Light-Cycler apparatus (Roche Diagnostics) in line with the manufacturer's instructions.
cDNAs were quantified by NanoDrop ND-1000 (Thermo Scientific); and concentrations were equalized to 100 μg/μL to standardize per cDNA amount.
The sequences of the primer sets and the reaction conditions are shown in Supplementary Table S5.
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9

Quantification of miRNA expression

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Total RNA was isolated using the RNeasy Mini Kit (EZ™ Total RNA Mini Prep Kit, Enzynomics, South Korea) according to the manufacturer’s protocol and reverse transcribed using the HB_I RT Reaction Kit. cDNAs were amplified by qRT-PCR using the synthesized specific HB_I Nucleic Mix II primers and RNU6B HB primers (HeimBiotek, South Korea). PCR was performed using the LightCycler instrument (Roche Applied Sciences, Indianapolis, IN, USA). PCR was started at 95°C for 15 min, followed by 40 cycles at 95°C for 10 s and 60°C for 40 s, and finished with 95°C for 60 s, 55°C for 30 s and 95°C for 30 s. The expression of RNU6B was used to normalize the expression of target genes. The specific primer Has-miR-216b was designed and synthesized by HeimBiotek Company (HeimBiotek, South Korea). Relative miRNA fold change was normalized using standard Ct values of RNU6B (U6) (HeimBiotek, South Korea). RT-PCR was performed using the LightCycler instrument (Roche Applied Science, Indianapolis, IN, USA).
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10

Evaluating AECS Effects on Hyphal Gene Expression

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Effect of AECS on the expression of hyphal specific genes, hyphal wall protein 1 (HWP1), Agglutinin-like protein 1 (ALS1) and fourth secreted aspartyl proteinase (SAP4), was evaluated by qRT-PCR. Hot phenol/chloroform extraction method51 was used in extraction of total RNA from AECS treated (80 μg/ml) and untreated (0 μg/ml) hyphal growth of selected strain. Quantitative RT-PCR amplification mixtures (25 ml) contained 10 ng template cDNA, Light Cycler Hybridization Probes Master Mix kit (Roche diagnostics, Tenay, Turkey), and SYBR Green I master mix buffer with fluorescein. Light Cycler (Roche diagnostics, Tenay, Turkey) and Light Cycler 3.5 software were used52 (link),53 .
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