Ablation of Programmed −1 Ribosomal Frameshifting in Venezuelan Equine Encephalitis Virus Results in Attenuated Neuropathogenicity
Abstract
The alphaviruses Venezuelan equine encephalitis virus (VEEV), eastern equine encephalitis virus (EEEV), and western equine encephalitis virus (WEEV) are arthropod-borne positive-strand RNA viruses that are capable of causing acute and fatal encephalitis in many mammals, including humans. VEEV was weaponized during the Cold War and is recognized as a select agent. Currently, there are no FDA-approved vaccines or therapeutics for these viruses. The spread of VEEV and other members of this family due to climate change-mediated vector range expansion underscores the need for research aimed at developing medical countermeasures. These viruses utilize programmed −1 ribosomal frameshifting (−1 PRF) to synthesize the viral trans -frame (TF) protein, which has previously been shown to be important for neuropathogenesis in the related Sindbis virus. Here, the alphavirus −1 PRF signals were characterized, revealing novel −1 PRF stimulatory structures. −1 PRF attenuation mildly affected the kinetics of VEEV accumulation in cultured cells but strongly inhibited its pathogenesis in an aerosol infection mouse model. Importantly, the decreased viral titers in the brains of mice infected with the mutant virus suggest that the alphavirus TF protein is important for passage through the blood-brain barrier and/or for neuroinvasiveness. These findings suggest a novel approach to the development of safe and effective live attenuated vaccines directed against VEEV and perhaps other closely related −1 PRF-utilizing viruses.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 01, 2017
- Source ID
- 10.1128/jvi.01766-16
Entities
People
- Ashwini Brahms
- Bin Chen
- Caitlin Woodson
- Cynthia De La Fuente
- Jonathan D. Dinman
- Jonathan L. Jacobs
- Joseph A. Kendra
- Kylene Kehn-Hall
- Todd M. Bell
- Yousuf A. Khan
Organizations
- Defense Threat Reduction Agency
- George Mason University
- MRIGlobal
- National Institutes of Health
- University of Maryland