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Evaluation of control transcripts in real-time RT-PCR expression analysis during maritime pine embryogenesis
Sónia Gonçalves1, John Cairney, João Maroco
1Grupo Pinus, Instituto de Biologia Experimental e Tecnológica (IBET)/Instituto de Tecnologia Química e Biológica (ITQB), Aptd. 12, 2781-901 Oeiras, Portugal.
Planta
|July 22, 2005
Summary
This study found that common housekeeping genes are not suitable as internal controls for real-time RT-PCR in maritime pine embryos. Reliable mRNA quantification requires alternative methods, avoiding controversial gene selection.
Area of Science:
- Molecular Biology
- Plant Science
- Biotechnology
Background:
- Accurate mRNA quantification is crucial for understanding gene expression.
- Reference genes are commonly used as internal controls in real-time RT-PCR (reverse transcriptase polymerase chain reaction).
- The suitability of reference genes can vary significantly between species and experimental conditions.
Purpose of the Study:
- To evaluate the expression stability of four candidate reference genes in maritime pine embryos.
- To determine if commonly used housekeeping genes are reliable internal controls for gene expression analysis in this species.
- To propose an alternative strategy for accurate mRNA quantification.
Main Methods:
- Real-time RT-PCR was used to quantify the expression levels of four candidate reference genes: glyceraldehyde-3-phosphate-dehydrogenase, 18S ribosomal RNA, eukaryotic translation initiation factor eIF4AII, and ubiquitin.
- Gene expression was analyzed across nine distinct stages of maritime pine embryo development.
- Copy number quantification was performed to assess transcript variation.
Main Results:
- None of the four tested candidate reference genes exhibited stable expression levels throughout maritime pine embryo development.
- Significant variation, averaging a seven-fold difference, was observed in the copy number quantification of the candidate transcripts.
- This indicates that these genes are not suitable as internal controls for this specific experimental system.
Conclusions:
- The use of conventional housekeeping genes as internal controls in real-time RT-PCR for maritime pine embryos is unreliable.
- A combination of precise RNA quantification, monitoring of RT and PCR efficiency, and a robust external standard curve is proposed for reliable absolute mRNA quantification.
- This alternative approach can circumvent the issues associated with housekeeping gene selection and is particularly important for analyzing gene expression in developing tissues.