Investigating gene expression profiles of whole blood and peripheral blood mononuclear cells using multiple collection and processing methods

English version

Autoři: Aarti Gautam ^aff001; Duncan Donohue ^aff001; Allison Hoke ^aff001; Stacy Ann Miller ^aff001; Seshamalini Srinivasan ^aff001; Bintu Sowe ^aff001; Leanne Detwiler ^aff001; Jesse Lynch ^aff001; Michael Levangie ^aff001; Rasha Hammamieh ^aff001; Marti Jett ^aff001
Působiště autorů: US Army Center for Environmental Health Research, Fort Detrick, MD, United States of America ^aff001; The Geneva Foundation, US Army Center for Environmental Health Research, Fort Detrick, MD, United States of America ^aff002; Oak Ridge Institute for Science and Education, Fort Detrick, US Army Center for Environmental Health Research, Fort Detrick, MD, United States of America ^aff003
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0225137

Souhrn

Gene expression profiling using blood samples is a valuable tool for biomarker discovery in clinical studies. Different whole blood RNA collection and processing methods are highly variable and might confound comparisons of results across studies. The main aim of the current study is to compare how blood storage, extraction methodologies, and the blood components themselves may influence gene expression profiling. Whole blood and peripheral blood mononuclear cell (PBMC) samples were collected in triplicate from five healthy donors. Whole blood was collected in RNAgard^® and PAXgene^® Blood RNA Tubes, as well as in collection tubes with anticoagulants such as dipotassium ethylenediaminetetraacetic acid (K₂EDTA) and Acid Citrate Dextrose Solution A (ACD-A). PBMCs were separated using sodium citrate Cell Preparation Tubes (CPT^™), FICOLL^™, magnetic separation, and the LeukoLOCK^™ methods. After blood collection, the LeukoLOCK^™, K₂EDTA and ACD-A blood tubes were shipped overnight using cold conditions and samples from the rest of the collection were immediately frozen with or without pre-processing. The RNA was isolated from whole blood and PBMCs using a total of 10 different experimental conditions employing several widely utilized RNA isolation methods. The RNA quality was assessed by RNA Integrity Number (RIN), which showed that all PBMC procedures had the highest RIN values when blood was stabilized in TRIzol^® Reagent before RNA extraction. Initial data analysis showed that human blood stored and shipped at 4°C overnight performed equally well when checked for quality using RNA integrity number when compared to frozen stabilized blood. Comparisons within and across donor/method replicates showed signal-to-noise patterns which were not captured by RIN value alone. Pathway analysis using the top 1000 false discovery rate (FDR) corrected differentially expressed genes (DEGs) showed frozen vs. cold shipping conditions greatly impacted gene expression patterns in whole blood. However, the top 1000 FDR corrected DEGs from PBMCs preserved after frozen vs. cold shipping conditions (LeukoLOCK^™ preserved in RNAlater^®) revealed no significantly affected pathways. Our results provide novel insight into how RNA isolation, various storage, handling, and processing methodologies can influence RNA quality and apparent gene expression using blood samples. Careful consideration is necessary to avoid bias resulting from downstream processing. Better characterization of the effects of collection method idiosyncrasies will facilitate further research in understanding the effect of gene expression variability in human sample types.

Klíčová slova:

Blood – Gene expression – Lymphocytes – RNA extraction – RNA isolation – Specimen storage – T cells – White blood cells

Zdroje

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Investigating gene expression profiles of whole blood and peripheral blood mononuclear cells using multiple collection and processing methods

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