Aberrant DNA hypermethylation signature in acute myeloid leukemia directed by EVI1
Blood , Volume 117 - Issue 1 p. 234- 241
DNA methylation patterns are frequently dysregulated in cancer, although little is known of the mechanisms through which specific gene sets become aberrantly methylated. The ecotropic viral integration site 1 (EVI1) locus encodes a DNA binding zinc-finger transcription factor that is aberrantly expressed in a subset of acute myeloid leukemia (AML) patients with poor outcome. We find that the promoter DNA methylation signature of EVI1 AML blast cells differs from those of normal CD34+bone marrow cells and other AMLs. This signature contained 294 differentially methylated genes, of which 238 (81%) were coordinately hypermethylated. An unbiased motif analysis revealed an overrepresentation of EVI1 binding sites among these aberrantly hypermethylated loci. EVI1 was capable of binding to these promoters in 2 different EVI1-expressing cell lines, whereas no binding was observed in an EVI1-negative cell line. Furthermore, EVI1 was observed to interact with DNA methyl transferases 3A and 3B. Among the EVI1 AML cases, 2 subgroups were recognized, of which 1 contained AMLs with many more methylated genes, which was associated with significantly higher levels of EVI1 than in the cases of the other subgroup. Our data point to a role for EVI1 in directing aberrant promoter DNA methylation patterning in EVI1 AMLs.
|Organisation||Erasmus MC: University Medical Center Rotterdam|
Lugthart, S, Figueroa, M.E, Bindels, E.M.J, Skrabanek, L, Valk, P.J.M, Li, Y, … Delwel, H.R. (2011). Aberrant DNA hypermethylation signature in acute myeloid leukemia directed by EVI1. Blood, 117(1), 234–241. doi:10.1182/blood-2010-04-281337