Marzouka NA, Nordlund J, Bäcklin CL, Lönnerholm G, Syvänen AC, Carlsson Almlöf J
Bioinformatics 32 (7) 1080-1082 [2016-04-01; online 2015-11-09]
The Illumina Infinium HumanMethylation450 BeadChip (450k) is widely used for the evaluation of DNA methylation levels in large-scale datasets, particularly in cancer. The 450k design allows copy number variant (CNV) calling using existing bioinformatics tools. However, in cancer samples, numerous large-scale aberrations cause shifting in the probe intensities and thereby may result in erroneous CNV calling. Therefore, a baseline correction process is needed. We suggest the maximum peak of probe segment density to correct the shift in the intensities in cancer samples. CopyNumber450kCancer is implemented as an R package. The package with examples can be downloaded at http://cran.r-project.org firstname.lastname@example.org Supplementary data are available at Bioinformatics online.