Human CytoSNP-12 Infinium HD BeadChips and GenomeStudio software (Illumina) were used for genome-wide single nucleotide polymorphism (SNP) genotyping and for data filtering and analysis, respectively. Copy number variation (CNV) analysis was performed using CNVPartition version 2.4.4 with a confidence threshold set at 50 and a minimum of 10 SNP probes per CNV region [26 (link)]. Specific PEX gene exons were sequenced using described protocols [27 (link)]. 450K Infinium Methylation BeadChips (Illumina) and GenomeStudio software were used for global DNA methylation analysis, as described [28 (link), 29 (link)]. DNA methylation levels were summarized as β-values ranging from 0 (unmethylated) to 1 (fully methylated). Scaled DNA methylation scores and .idat files are available at the NCBI GEO repository [25 ] under Series Accession Number GSE68134. Confirmatory bisulfite DNA sequencing was conducted as described [28 (link), 29 (link)].
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