4.6 Article

Identifying Cancers Impacted by CDK8/19

Journal

CELLS
Volume 8, Issue 8, Pages -

Publisher

MDPI
DOI: 10.3390/cells8080821

Keywords

CDK8; CDK19; Cyclin C; cancer genomics; survival correlations

Categories

Funding

  1. NIH [P30GM103336]
  2. Ministry of Science and Education of the Russian Federation [14.W03.31.0020]
  3. Institute of Gene Biology, Russian Academy of Sciences [14.W03.31.0020]
  4. National Research, Development and Innovation Office, Hungary [NVKP_16-1-2016-0037, 2018-1.3.1-VKE-2018-00032, KH-129581]

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CDK8 and CDK19 Mediator kinases are transcriptional co-regulators implicated in several types of cancer. Small-molecule CDK8/19 inhibitors have recently entered or are entering clinical trials, starting with breast cancer and acute myeloid leukemia (AML). To identify other cancers where these novel drugs may provide benefit, we queried genomic and transcriptomic databases for potential impact of CDK8, CDK19, or their binding partner CCNC. sgRNA analysis of a panel of tumor cell lines showed that most tumor types represented in the panel, except for some central nervous system tumors, were not dependent on these genes. In contrast, analysis of clinical samples for alterations in these genes revealed a high frequency of gene amplification in two highly aggressive subtypes of prostate cancer and in some cancers of the GI tract, breast, bladder, and sarcomas. Analysis of survival correlations identified a group of cancers where CDK8 expression correlated with shorter survival (notably breast, prostate, cervical cancers, and esophageal adenocarcinoma). In some cancers (AML, melanoma, ovarian, and others), such correlations were limited to samples with a below-median tumor mutation burden. These results suggest that Mediator kinases are especially important in cancers that are driven primarily by transcriptional rather than mutational changes and warrant an investigation of their role in additional cancer types.

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