Mutations in isocitrate dehydrogenase 1 and 2 occur frequently in intrahepatic cholangiocarcinomas and share hypermethylation targets with glioblastomas.

Journal Article (Journal Article)

Mutations in the genes encoding isocitrate dehydrogenase, IDH1 and IDH2, have been reported in gliomas, myeloid leukemias, chondrosarcomas and thyroid cancer. We discovered IDH1 and IDH2 mutations in 34 of 326 (10%) intrahepatic cholangiocarcinomas. Tumor with mutations in IDH1 or IDH2 had lower 5-hydroxymethylcytosine and higher 5-methylcytosine levels, as well as increased dimethylation of histone H3 lysine 79 (H3K79). Mutations in IDH1 or IDH2 were associated with longer overall survival (P=0.028) and were independently associated with a longer time to tumor recurrence after intrahepatic cholangiocarcinoma resection in multivariate analysis (P=0.021). IDH1 and IDH2 mutations were significantly associated with increased levels of p53 in intrahepatic cholangiocarcinomas, but no mutations in the p53 gene were found, suggesting that mutations in IDH1 and IDH2 may cause a stress that leads to p53 activation. We identified 2309 genes that were significantly hypermethylated in 19 cholangiocarcinomas with mutations in IDH1 or IDH2, compared with cholangiocarcinomas without these mutations. Hypermethylated CpG sites were significantly enriched in CpG shores and upstream of transcription start sites, suggesting a global regulation of transcriptional potential. Half of the hypermethylated genes overlapped with DNA hypermethylation in IDH1-mutant gliobastomas, suggesting the existence of a common set of genes whose expression may be affected by mutations in IDH1 or IDH2 in different types of tumors.

Full Text

Duke Authors

Cited Authors

  • Wang, P; Dong, Q; Zhang, C; Kuan, P-F; Liu, Y; Jeck, WR; Andersen, JB; Jiang, W; Savich, GL; Tan, T-X; Auman, JT; Hoskins, JM; Misher, AD; Moser, CD; Yourstone, SM; Kim, JW; Cibulskis, K; Getz, G; Hunt, HV; Thorgeirsson, SS; Roberts, LR; Ye, D; Guan, K-L; Xiong, Y; Qin, L-X; Chiang, DY

Published Date

  • June 20, 2013

Published In

Volume / Issue

  • 32 / 25

Start / End Page

  • 3091 - 3100

PubMed ID

  • 22824796

Pubmed Central ID

  • PMC3500578

Electronic International Standard Serial Number (EISSN)

  • 1476-5594

Digital Object Identifier (DOI)

  • 10.1038/onc.2012.315


  • eng

Conference Location

  • England