Journal
MBIO
Volume 13, Issue 2, Pages -Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/mbio.03002-21
Keywords
SARS-CoV-2; COVID-19; coronavirus; influenza virus; ebolavirus; genome-wide CRISPR screen; respiratory viruses; VPS29; retromer; viral entry; trafficking; zoonosis; Ebola; endosomes; influenza; virus entry
Categories
Funding
- National Institute of Allergy and Infectious Diseases [F30AI157898, R01AI 50111, R37AI640003, P01AI65075]
- National Institute of General Medical Sciences [T32GM007739]
- Charles H. Revson Senior Fellowship in Biomedical Science
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These data identify a host pathway by which VPS29 and associated factors control the endosomal environment and influence susceptibility to viral infection. This pathway could serve as a pharmaceutical target for intervention in zoonotic viral diseases, including those caused by coronaviruses, influenza viruses, and filoviruses, all of which are pandemic threats.
These data identify a host pathway by which VPS29 and associated factors control the endosomal environment in a manner that influences susceptibility to viral infection. This pathway could serve as a pharmaceutical target for intervention in zoonotic viral diseases, including those caused by coronaviruses, influenza viruses, and filoviruses, all of which are pandemic threats. Emerging zoonotic viral pathogens threaten global health, and there is an urgent need to discover host and viral determinants influencing infection. We performed a loss-of-function genome-wide CRISPR screen in a human lung cell line using HCoV-OC43, a human betacoronavirus. One candidate gene, VPS29, a component of the retromer complex, was required for infection by HCoV-OC43, SARS-CoV-2, other endemic- and pandemic-threat coronaviruses, as well as ebolavirus. Notably, we observed a heightened requirement for VPS29 by the recently described Omicron variant of SARS-CoV-2 compared to the ancestral variant. However, VPS29 deficiency had no effect on certain other viruses that enter cells via endosomes and had an opposing, enhancing effect on influenza A virus infection. Deficiency in VPS29 or other retromer components caused changes in endosome morphology and acidity and attenuated the activity of endosomal proteases. These changes in endosome properties caused incoming coronavirus, but not influenza virus particles, to become entrapped therein. Overall, these data show how host regulation of endosome characteristics can influence cellular susceptibility to viral infection and identify a host pathway that could serve as a pharmaceutical target for intervention in zoonotic viral diseases. IMPORTANCE These data identify a host pathway by which VPS29 and associated factors control the endosomal environment in a manner that influences susceptibility to viral infection. This pathway could serve as a pharmaceutical target for intervention in zoonotic viral diseases, including those caused by coronaviruses, influenza viruses, and filoviruses, all of which are pandemic threats. Our findings show how host regulation of endosome characteristics can influence viral susceptibility in both a positive and negative manner.
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