Influence of storage conditions of small volumes of blood on immune transcriptomic profiles

• Main Authors: Rebecca Mathew, Mohammed Toufiq, Valentina Mattei, Muna Al Hashmi, Harshitha Shobha Manjunath, Basirudeen Syed Ahamed Kabeer, Rita Calzone, Chiara Cugno, Damien Chaussabel, Sara Deola, Sara Tomei
• Format: Article
• Language: English
• Published: BMC 2020-03-01
• Series: BMC Research Notes
• Subjects: Storage; Blood; Trancriptome; QPCR; Immune profiling; Tempus
• Online Access: http://link.springer.com/article/10.1186/s13104-020-04980-z

Abstract Objective Transcriptome analysis of human whole blood is used to discover biomarkers of diseases and to assess phenotypic traits. Here we have collected small volumes of blood in Tempus solution and tested whether different storage conditions have an impact on transcriptomic profiling. Fifty µl of blood were collected in 100µl of Tempus solutions, freezed at − 20 °C for 1 day and eventually thawed, stored and processed under five different conditions: (i) − 20 °C for 1 week; (ii) +4 °C for 1 week; (iii) room temperature for 1 week; (iv) room temperature for 1 day, − 20 °C for 1 day, room temperature until testing at day 7, (v) − 20 °C for 1 week, RNA was isolated and stored in GenTegra solution. We used 272 immune transcript specific assays to test the expression profiling using qPCR based Fluidigm BioMark HD dynamic array. Results RNA yield ranged between 0.17 and 1.39µg. Except for one sample, RIN values were > 7. Using Principal Component Analysis, we saw that the storage conditions did not drive sample distribution. The condition that showed larger variability was the RT-FR-RT (room temperature–freezing–room temperature), suggesting that freezing–thawing cycles may have a worse effect on data reproducibility than keeping the samples at room temperature.