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Real Time RT-PCR

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

Updated: Oct 26, 2025

Polymerase Chain Reaction: Basic Protocol Plus Troubleshooting and Optimization Strategies

Polymerase Chain Reaction: Basic Protocol Plus Troubleshooting and Optimization Strategies

Published on: May 22, 2012

An optimized protocol for stepwise optimization of real-time RT-PCR analysis.

Fangzhou Zhao^1,2, Nathan A Maren^2,3, Pawel Z Kosentka²

¹Soybean Research Institute, Nanjing Agricultural University, 210095, Nanjing, China.

Horticulture Research

|August 1, 2021

Summary

This study introduces an optimized method for designing primers for quantitative real-time reverse transcription PCR (qRT-PCR). The approach ensures primer specificity by considering gene similarities, improving data accuracy in plant gene expression analysis.

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Area of Science:

Molecular Biology
Plant Science
Biotechnology

Background:

Primer design for quantitative real-time reverse transcription PCR (qRT-PCR) often overlooks homologous gene similarities in plant genomes, potentially leading to inaccurate results.
Optimization of qRT-PCR parameters is crucial for ensuring primer efficiency, specificity, and sensitivity, which is frequently bypassed due to false confidence in primer design tools.

Purpose of the Study:

To propose and validate an optimized sequential approach for primer and qRT-PCR parameter optimization.
To enhance the accuracy and reliability of gene expression analysis in plants, particularly for reference gene selection.

Main Methods:

Developed a primer design strategy focusing on single-nucleotide polymorphisms (SNPs) within homologous sequences.
Implemented sequential optimization of primer sequences, annealing temperatures, primer concentrations, and cDNA concentrations.
Utilized efficiency calibration, standard curve, and the 2^-ΔΔCt method to achieve high primer efficiency (E = 100 ± 5%) and coefficient of determination (R² ≥ 0.9999).

Main Results:

The optimized approach successfully identified optimal reference genes in *Tripidium ravennae* across different tissues and developmental stages.
Validated the utility of the identified reference genes under varying abiotic stress conditions.
Demonstrated the protocol's effectiveness by assessing reference gene expression stability in soybean under biotic stress.

Conclusions:

The proposed optimized protocol significantly improves the accuracy and reliability of qRT-PCR analysis by ensuring primer specificity and optimal reaction conditions.
This method provides a robust framework for selecting and validating reference genes, essential for accurate gene expression studies in plants.
The approach is effective for various applications, including stress response studies and comparative gene expression analysis in different plant species.