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Related Concept Videos

Real Time RT-PCR02:57

Real Time RT-PCR

Real-time reverse transcription-polymerase chain reaction, or Real-time RT-PCR, is an analytical tool used to determine the expression level of target genes. The method involves converting mRNA to complementary DNA with the help of an enzyme known as reverse transcriptase, followed by the PCR amplification of the cDNA. These two processes can be performed simultaneously in a single tube or separately as a two-step reaction.
The real-time quantification of the number of amplified products is...

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Related Experiment Video

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Quantification of three DNA Lesions by Mass Spectrometry and Assessment of Their Levels in Tissues of Mice Exposed to Ambient Fine Particulate Matter
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Quantitation of cellular deoxynucleoside triphosphates.

Paola Ferraro1, Elisa Franzolin, Giovanna Pontarin

  • 1Department of Biology, University of Padova, 35131 Padova, Italy.

Nucleic Acids Research
|December 17, 2009
PubMed
Summary
This summary is machine-generated.

Accurate deoxyribonucleoside triphosphate (dNTP) quantification is crucial for DNA replication and repair. New assay conditions and enzymes minimize errors caused by ribonucleotide incorporation, ensuring more reliable dNTP measurements.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Eukaryotic cells maintain precise deoxyribonucleoside triphosphate (dNTP) levels essential for DNA replication and repair.
  • Deviations in dNTP concentrations can lead to mutations, impaired DNA repair, and mitochondrial dysfunction.

Purpose of the Study:

  • To identify and address inaccuracies in standard enzymatic assays for quantifying deoxyribonucleoside triphosphates (dNTPs).
  • To develop optimized assay conditions that prevent ribonucleotide incorporation, a common source of overestimation.

Main Methods:

  • Enzymatic quantification of dNTPs using DNA polymerase incorporation assays.
  • Modification of assay conditions, including enzyme choice (Klenow, Taq, Thermo Sequenase) and reactant concentrations.
  • Comparison of dNTP measurements under standard versus optimized conditions.

Main Results:

  • Klenow DNA polymerase can erroneously incorporate ribonucleotides, leading to significant overestimation of dNTP concentrations.
  • Optimized conditions for dATP and dTTP assays involve minimizing Klenow enzyme and labeled dATP/dTTP concentrations.
  • Replacing Klenow polymerase with Taq DNA polymerase or Thermo Sequenase is necessary for accurate dCTP and dGTP quantification.

Conclusions:

  • Standard dNTP assays using Klenow polymerase are prone to overestimation due to ribonucleotide incorporation.
  • Revised assay protocols and alternative polymerases provide more accurate dNTP measurements.
  • Previous studies may have reported inflated dGTP and dCTP values due to these methodological flaws.