DNA tumor virus oncogenes antagonize the cGAS-STING DNA-sensing pathway
Viral oncogenes remove the host's STING
Cancer-causing viruses, such as the human papilloma virus (HPV) that causes cervical cancer, account for 12% of human cancers. One way they can cause cancer is by targeting tumor suppressor proteins in the host. Now Lau et al. report that DNA tumor viruses can also thwart the host's immune system. Oncogenes from HPV and human adenovirus bound to the protein STING, a key component of the cGAS-STING pathway that senses and defends against intracellular DNA. In this way, the viruses subvert the host's antiviral immunity and set up shop, which, for an unlucky few, eventually causes cancer.
Science, this issue p. 568
Abstract
Cyclic guanosine monophosphate–adenosine monophosphate synthase (cGAS) detects intracellular DNA and signals through the adapter protein STING to initiate the antiviral response to DNA viruses. Whether DNA viruses can prevent activation of the cGAS-STING pathway remains largely unknown. Here, we identify the oncogenes of the DNA tumor viruses, including E7 from human papillomavirus (HPV) and E1A from adenovirus, as potent and specific inhibitors of the cGAS-STING pathway. We show that the LXCXE motif of these oncoproteins, which is essential for blockade of the retinoblastoma tumor suppressor, is also important for antagonizing DNA sensing. E1A and E7 bind to STING, and silencing of these oncogenes in human tumor cells restores the cGAS-STING pathway. Our findings reveal a host-virus conflict that may have shaped the evolution of viral oncogenes.
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Supplementary Material
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Materials and Methods
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Science
Volume 350 | Issue 6260
30 October 2015
30 October 2015
Copyright
Copyright © 2015, American Association for the Advancement of Science.
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Submission history
Received: 10 April 2015
Accepted: 11 September 2015
Published in print: 30 October 2015
Acknowledgments
We are grateful to D. DiMaio for the BPV-E2 construct; to J. Kagan for the p450 ER-targeting motif; to J. Sage for providing the Rb/p107/p130 triple-knockout MEFs; and to members of the Stetson lab for discussions. The data presented in this paper are tabulated in the main paper and in the supplementary materials. D.B.S. is a scholar of the Rita Allen Foundation and a Burroughs Wellcome Fund Investigator in the Pathogenesis of Infectious Disease. E.E.G. is supported by a Cancer Research Institute Irvington postdoctoral fellowship.
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