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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Quantitation of bovine TNF-alpha mRNA by reverse transcription and competitive polymerase chain reaction amplification.

A reverse transcription (RT) and competitive polymerase chain reaction (PCR) amplification technique was developed to quantify bovine tumor necrosis factor-alpha (TNF-alpha) mRNA. A bovine TNF-alpha cDNA insert containing plasmid was used to produce a 237-bp cDNA competitive template which, when PCR-amplified with primers designed to amplify bovine TNF-alpha cDNA, resulted in a 147-bp product distinguishable by agarose gel electrophoresis from the 378-bp TNF-alpha RT-PCR-amplified cDNA product. Dilutions of competitive template were co-amplified with constant amounts of total cellular RNA harvested from bovine alveolar macrophages (BAM). Products were separated in ethidium-bromide-stained agarose gels and relative amounts of TNF-alpha mRNA were determined by densitometric scanning of TNF-alpha cDNA and competitive template product bands on photographic negatives. Digestions with Pvu II and Sty I restriction endonucleases verified that RT-PCR-amplified TNF-alpha cDNA products were authentic. A time study indicated that TNF-alpha mRNA concentrations peaked 3 h after endotoxin and virus induction of BAMs.[1]


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