Experimental factors affecting the robustness of DNA methylation analysis View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2016-12

AUTHORS

Heidi D Pharo, Hilde Honne, Hege M Vedeld, Christina Dahl, Kim Andresen, Knut Liestøl, Marine Jeanmougin, Per Guldberg, Guro E Lind

ABSTRACT

Diverging methylation frequencies are often reported for the same locus in the same disease, underscoring the need for limiting technical variability in DNA methylation analyses. We have investigated seven likely sources of variability at different steps of bisulfite PCR-based DNA methylation analyses using a fully automated quantitative methylation-specific PCR setup of six gene promoters across 20 colon cancer cell lines. Based on >15,000 individual PCRs, all tested parameters affected the normalized percent of methylated reference (PMR) differences, with a fourfold varying magnitude. Additionally, large variations were observed across the six genes analyzed. The highest variation was seen using single-copy genes as reference for normalization, followed by different amounts of template in the PCR, different amounts of DNA in the bisulfite reaction, and storage of bisulfite converted samples. Finally, when a highly standardized pipeline was repeated, the difference in PMR value for the same assay in the same cell line was on average limited to five (on a 0-100 scale). In conclusion, a standardized pipeline is essential for consistent methylation results, where parameters are kept constant for all samples. Nevertheless, a certain level of variation in methylation values must be expected, underscoring the need for careful interpretation of data. More... »

PAGES

33936

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/srep33936

DOI

http://dx.doi.org/10.1038/srep33936

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1006258605

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/27671843


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