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| EWAS ID | EWAS164 |
| GSE ID | GSE49031 |
| EWAS Title | Genome-wide signatures of differential DNA methylation in pediatric acute lymphoblastic leukemia |
| Disease/Phenotype | pediatric acute lymphoblastic leukemia |
| Group1 | immunophenotype:BCP-ALL(the B-cell precursor ALL) |
| Group2 | immunophenotype:T-ALL |
| Group1 Sample Size | 664 |
| Group2 Sample Size | 101 |
| Summary | We surveyed the DNA methylation levels of 435,941 CpG sites in samples from 764 children at diagnosis of ALL and from 27 children at relapse. This survey uncovered four characteristic methylation signatures. First, compared with control blood cells, the methylomes of ALL cells shared 9,406 predominantly hypermethylated CpG sites, independent of cytogenetic background. Second, each cytogenetic subtype of ALL displayed a unique set of hyper- and hypomethylated CpG sites. The CpG sites that constituted these two signatures differed in their functional genomic enrichment to regions with marks of active or repressed chromatin. Third, we identified subtype-specific differential methylation in promoter and enhancer regions that were strongly correlated with gene expression. Fourth, a set of 6,612 CpG sites was predominantly hypermethylated in ALL cells at relapse, compared with matched samples at diagnosis. Analysis of relapse-free survival identified CpG sites with subtype-specific differential methylation that divided the patients into different risk groups, depending on their methylation status. |
| Contributor | Nordlund J, Bäcklin CL, Lönnerholm G, Syvänen AC |
| Public date | Public on Sep 18, 2013 |
| Citation (PubMed ID) | 24063430, 25729447, 26494837 |
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