Key result
RNeasy FFPE kit achieves 100% RNA extraction success from archival myocardium, outperforming Trizol and SDS.
Absolute Event Rate: 100% vs 87.5%
p-value: p=0.002
The Qiagen RNeasy FFPE kit provides superior RNA yield and reproducibility from archival FFPE myocardial tissues compared to Trizol and SDS methods, enabling downstream gene expression and pathogen detection.
May aid archival myocardial RNA research; hypothesis-generating, with human validation needed before clinical use.
INTRODUCTION: Archival tissue samples preserved in formalin are a great source of treasure for biomedical research and diagnostics. Formalin, though is a good preservative, causes the modification of nucleic acid limiting the application of fixed tissues. The present study evaluated three methods of RNA extraction for constitutive gene expression and pathogen detection. MATERIAL AND METHODS: Sixteen archival formalin-fixed paraffin-embedded (FFPE) myocardial tissues were subjected to RNA extraction by Trizol, SDS, and RNeasy FFPE kit followed by RT-PCR and Taqman Real-Time PCR to study the expression of housekeeping genes. RESULTS: RNA was extracted from all 16 myocardial tissues (100%) by RNeasy FFPE kit, as compared to 14/16 by Trizol and 8/10 by SDS methods. The expression of Glyceraldehyde-3-phosphate dehydrogenase (GAPDH)was observed in RNA extracted by RNeasy FFPE kit and Trizol. High yield of RNA was obtained by RNeasy FFPE kit than Trizol (P = 0.002) and SDS(P = 0.012). Of the three methods, RNeasy FFPE kit was evaluated for Enterovirus RNA detection in 16 other histopathologically confirmed FFPE tissues of dilated cardiomyopathy (DCM) cases and Enterovirus genome was detected in 4/16 (25%) FFPE tissues of DCM cases. The enteroviral sequences of the viral isolates revealed 99% homology with Human coxsackievirus B5. CONCLUSION: The Qiagen RNeasy FFPE kit resulted in significantly high reproducibility of RNA from FFPE myocardial tissues, which are suitable for amplification by Taq-Man Real-Time and RT-PCR. Thus, the results show that these FFPE tissues can be used for gene expression, pathogen detection, and epidemiological studies.
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Sharma et al. (2012) studied Dilated cardiomyopathy (n=32). RNeasy FFPE kit vs. Trizol and SDS methods was evaluated on RNA extraction success rate (p=0.002). The RNeasy FFPE kit successfully extracted RNA from 100% of archival myocardial tissues, yielding significantly more RNA than Trizol (P=0.002) and SDS (P=0.012) methods.
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