Methylation profiling

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Epigenetic blueprint identifies poor outcome and hypomethylating agent-responsive T-ALL subgroup


ABSTRACT: Adult T-cell acute lymphoblastic leukemia (T-ALL) is an aggressive hematological malignancy still associated with poor outcome calling for new therapeutic options. DNA methylation landscapes of adult T-ALL remain largely uncharacterized. Here, we systematically analyzed the DNA methylation profiles of normal thymic sorted T-cell subpopulations and 143 primary adult T-ALLs as part of French GRAALL 2003-2005 trial. Our results indicated that T-ALL is epigenetically distinct from normal T-cell subpopulations and consisted of five major subtypes (C1-C5) which were either associating with co-occurring DNMT3A/IDH2 mutations (C1), TAL1 deregulation (C2), TLX3 (C3), TLX1/in cis-HOXA9 (C4) or in trans-HOXA9 (C5) overexpression. Importantly, our data identified an unexpected subset of hypermethylated T-ALL associated with poor outcome and primary therapeutic response. Using mouse xenografts, we showed that hypermethylated T-ALL samples displayed therapeutic response to the DNA hypomethylating agent, 5-Azacitidine, which significantly delayed tumor progression suggesting epigenetic-based therapies as a novel treatment option in hypermethylated T-ALL.

ORGANISM(S): Homo sapiens

PROVIDER: GSE147667 | GEO | 2021/03/01

REPOSITORIES: GEO

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