Figure s1: Bioanalyzer trace, long RNA vs miRNA Figure s2: miRNA sequencing saturation curves Figure s3: Small RNA detected in Janus samples Table s1: Adjusted p-values for mean DNA yield between treatments. Significant values in bold. Figure s4: DNA yield by serum treatments Figure s5: Example of DNA Bioanalyzer trace Figure s6: DNA sequencing results Figure s7: Example of sequence distribution
ARTICLE ABSTRACTBackground: The impacts of long-term storage and varying preanalytical factors on the quality and quantity of DNA and miRNA from archived serum have not been fully assessed. Preanalytical and analytical variations and degradation may introduce bias in representation of DNA and miRNA and may result in loss or corruption of quantitative data.Methods: We have evaluated DNA and miRNA quantity, quality, and variability in samples stored up to 40 years using one of the oldest prospective serum collections in the world, the Janus Serumbank, a biorepository dedicated to cancer research.Results: miRNAs are present and stable in archived serum samples frozen at −25°C for at least 40 years. Long-time storage did not reduce miRNA yields; however, varying preanalytical conditions had a significant effect and should be taken into consideration during project design. Of note, 500 μL serum yielded sufficient miRNA for qPCR and small RNA sequencing and on average 650 unique miRNAs were detected in samples from presumably healthy donors. Of note, 500 μL serum yielded sufficient DNA for whole-genome sequencing and subsequent SNP calling, giving a uniform representation of the genomes.Conclusions: DNA and miRNA are stable during long-term storage, making large prospectively collected serum repositories an invaluable source for miRNA and DNA biomarker discovery.Impact: Large-scale biomarker studies with long follow-up time are possible utilizing biorepositories with archived serum and state-of-the-art technology. Cancer Epidemiol Biomarkers Prev; 24(9); 1381–7. ©2015 AACR.