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Impact of thawing on RNA integrity and gene expression analysis in fresh frozen tissue
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Genetics and Pathology.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Genetics and Pathology.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Urology. (Endocrine Surgery)
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2009 (English)In: Diagnostic molecular pathology (Print), ISSN 1052-9551, E-ISSN 1533-4066, Vol. 18, no 1, 44-52 p.Article in journal (Refereed) Published
Abstract [en]

Biobanks of fresh, unfixed human tissue represent a valuable source for gene expression analysis in translational research and molecular pathology. The aim of this study was to evaluate the impact of thawing on RNA integrity and gene expression in fresh frozen tissue specimens. Portions of snap frozen tonsil tissue, unfixed or immersed in RNAlater, were thawed at room temperature for 0 minute, 5 minutes, 30 minutes, 45 minutes, 1 hour, 3 hours, 6 hours, and 16 hours before RNA extraction. Additionally, tonsil tissue underwent repetitive freezing and thawing cycles. RNA integrity was analyzed by microchip gel electrophoresis and gene expression by quantitative real-time polymerase chain reaction for selected genes (FOS, TGFB1, HIF1A, BCL2, and PCNA). Minimal RNA degradation was detected after 30 minutes of thawing in unfixed samples. This degradation was accompanied by relevant changes in gene expression for FOS and BCL2 at 45 minutes. Modified primer design or the use of different housekeeping genes could not rectify the changes for FOS. Repetitive thawing cycles had similar effects on RNA integrity. The incubation of the tissue in RNAlater efficiently prevented RNA degradation. In conclusion, degradation of RNA in frozen tissue occurs first after several minutes of thawing. Already minimal decrease in RNA quality may result in significant changes in gene expression patterns in clinical tissue samples.

Place, publisher, year, edition, pages
2009. Vol. 18, no 1, 44-52 p.
Keyword [en]
RNA degradation, gene expression, RNA quality, biobank, thawing
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:uu:diva-112901DOI: 10.1097/PDM.0b013e3181857e92ISI: 000263781000006PubMedID: 19214109OAI: oai:DiVA.org:uu-112901DiVA: diva2:288892
Available from: 2010-01-22 Created: 2010-01-22 Last updated: 2015-06-24Bibliographically approved

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Botling, JohanSegersten, UlrikaEngström, MatsMalmström, Per-UnoMicke, Patrick

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