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qPCR Is a Sensitive and Rapid Method for Detection of Cytomegaloviral DNA in Formalin-fixed, Paraffin-embedded Biopsy Tissue
Published on: July 9, 2014
Use of proteinase K for RT-PCR of cytokine mRNA in formalin fixed tissue
G N Davies1, I S Bevan, J B Lundemose
1Microbial Molecular Genetics and Cell Biology Research Group, School of Biological Sciences.
Abstract:
Fresh tissue from cases of sudden infant death syndrome is becoming increasingly scarce and therefore researchers interesting in studying the aetiology of this syndrome have had to resort to archival tissue, usually in the form of paraffin wax sections. A simple method for isolating mRNA from formalin fixed, paraffin wax embedded material of sufficient purity for reverse transcription (RT)-PCR is described. Proteinase K treatment of formalin fixed, wax embedded tissue followed by RNA STAT-60 extraction was successful in isolating mRNA suitable for RT-PCR. Interleukin (IL)-1alpha, IL-6 and tumour necrosis factor (TNF) transcripts were amplified successfully from heart, but not thyroid, kidney or liver tissue, of a patient who died following rejection of a transplanted heart, and IL-1alpha, but not IL-6 or TNF, transcripts from lung tissue of a six month old baby who died of viral pneumonia. Transcripts of a housekeeping gene were detected in all tissues. This method should be useful for examining gene expression in archival material.
Insights
Researchers can now isolate mRNA from archival paraffin-embedded tissues for gene expression studies. This method successfully amplified cytokine transcripts (Interleukin-1alpha, Interleukin-6, and Tumor Necrosis Factor) from challenging samples.
Area of Science:
- Molecular Biology
- Pathology
- Biochemistry
Background:
- Sudden Infant Death Syndrome (SIDS) research is limited by the scarcity of fresh tissue samples.
- Archival formalin-fixed, paraffin-embedded (FFPE) tissues are an alternative but pose challenges for RNA isolation.
- Gene expression analysis in FFPE tissues is crucial for understanding disease etiology.
Purpose of the Study:
- To develop a simple and effective method for isolating messenger RNA (mRNA) from FFPE tissues.
- To assess the purity and suitability of isolated mRNA for downstream applications like reverse transcription-polymerase chain reaction (RT-PCR).
- To demonstrate the feasibility of detecting specific gene transcripts in archival SIDS-related cases.
Main Methods:
- Utilized archival FFPE tissue samples.
- Employed Proteinase K treatment followed by RNA STAT-60 extraction for mRNA isolation.
- Performed RT-PCR to amplify transcripts of Interleukin (IL)-1alpha, IL-6, and Tumor Necrosis Factor (TNF).
- Amplified transcripts of a housekeeping gene as a control.
Main Results:
- Successfully isolated mRNA of sufficient purity for RT-PCR from FFPE tissues.
- Detected IL-1alpha, IL-6, and TNF transcripts in heart tissue from a patient with heart transplant rejection.
- Detected IL-1alpha transcripts in lung tissue from an infant with viral pneumonia.
- Confirmed the presence of housekeeping gene transcripts in all tested tissues.
Conclusions:
- The described method enables successful mRNA isolation from archival FFPE tissues.
- This technique is valuable for studying gene expression in SIDS and other conditions using limited archival material.
- The findings support the use of FFPE tissues for molecular investigations in historical cases.
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