Human samples are commonly collected and long-term stored in biobanks for current and future analyses. Even though techniques for freezing human blood are well established, the storage time can compromise the cell viability as well as the yield and quality of nucleic acids (RNA and DNA) extracted from them. In this study, a protocol to obtain peripheral blood mononuclear cells (PBMCs) from 70 subjects, which were stored at − 196 °C from EDTA tubes for a long-term, was assessed. In parallel; a protocol to obtain DNA from the same subjects, which were stored at − 80 °C from citrate tubes, was also studied. Samples stored from 2008 to 2012 were studied and the results obtained showed that there were no statistically significant differences in the RNA or DNA extracted in terms of purity, integrity and functionality The freezing protocol used by the Málaga Biobank shows that viable PBMCs and DNA could be kept for a period of, at least, 10 years, with a high quality and performance. Furthermore, RNA extracted from these PBMCs presents also a good quality and performance. Therefore, the samples frozen according to the conditions of the protocols assessed in this study could be optimal for biomedical research.
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This work has been (partially) supported by Instituto de Salud Carlos III and Red Nacional de Biobancos (Hospital Regional Universitario Carlos Haya, Málaga RD09/0076/0112 and PT13/0010/0006). The authors thank all technical personnel of the genetic platform of the Instituto de Investigación Biomédica de Málaga (IBIMA).
Conflict of interest
The authors declare that they have no conflict of interest.
All individuals gave written informed consent to participate in research prior to blood collection in accordance with the Andalusian Public Health System Biobank located in Málaga, and approved by the Ethics Committee of Clinical Research (CEIC) from IBIMA.
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Ortega-Pinazo, J., Díaz, T., Martínez, B. et al. Quality assessment on the long-term cryopreservation and nucleic acids extraction processes implemented in the andalusian public biobank. Cell Tissue Bank 20, 255–265 (2019). https://doi.org/10.1007/s10561-019-09764-9
- Whole blood