Genome-wide DNA methylation analysis identifies MEGF10 as a novel epigenetically repressed candidate tumor suppressor gene in neuroblastoma

Research output: Contribution to journalArticlepeer-review

Authors

  • J CHARLET
  • A TOMARI
  • AR Dallosso
  • M Szemes
  • M Kaselova
  • TJ Curry
  • B Almutairi
  • HC Etchevers
  • KT Malik
  • KW Brown

Colleges, School and Institutes

Abstract

Neuroblastoma is a childhood cancer in which many children still have poor
outcomes, emphasising the need to better understand its pathogenesis. Despite
recent genome-wide mutation analyses, many primary neuroblastomas do not contain recognizable driver mutations, implicating alternate molecular pathologies such as epigenetic alterations. To discover genes that become epigenetically deregulated during neuroblastoma tumorigenesis, we took the novel approach of comparing neuroblastomas to neural crest precursor cells, using genome-wide DNA methylation analysis. We identified 93 genes that were significantly differentially methylated of which 26 (28%) were hypermethylated and 67 (72%) were hypomethylated. Concentrating on hypermethylated genes to identify candidate tumor suppressor loci, we found the cell engulfment and adhesion factor gene MEGF10 to be epigenetically repressed by DNA hypermethylation or by H3K27/K9 methylation in neuroblastoma cell lines. MEGF10 showed significantly down-regulated expression in neuroblastoma tumor samples; furthermore patients with the lowest-expressing tumors had reduced relapse-free survival. Our functional studies showed that knock-down of MEGF10 expression in neuroblastoma cell lines promoted cell growth, consistent with MEGF10 acting as a clinically relevant, epigenetically deregulated neuroblastoma tumor suppressor gene.

Details

Original languageEnglish
Pages (from-to)1290-1301
JournalMolecular Carcinogenesis
Volume56
Issue number4
Early online date29 Nov 2016
Publication statusPublished - Apr 2017

Keywords

  • neuroblastoma, MEGF10, epigenetics, DNA methylation, histone methylation