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Updated: May 8, 2026
MicroRNA-based Regulation of Picornavirus Tropism
Published on: February 6, 2017
MicroRNA-based strategy to mitigate the risk of gain-of-function influenza studies
Ryan A Langlois1,2, Randy A Albrecht1,2, Brian Kimble3
1Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA.
Abstract:
Recent gain-of-function studies in influenza A virus H5N1 strains revealed that as few as three-amino-acid changes in the hemagglutinin protein confer the capacity for viral transmission between ferrets. As transmission between ferrets is considered a surrogate indicator of transmissibility between humans, these studies raised concerns about the risks of gain-of-function influenza A virus research. Here we present an approach to strengthen the biosafety of gain-of-function influenza experiments. We exploit species-specific endogenous small RNAs to restrict influenza A virus tropism. In particular, we found that the microRNA miR-192 was expressed in primary human respiratory tract epithelial cells as well as in mouse lungs but absent from the ferret respiratory tract. Incorporation of miR-192 target sites into influenza A virus did not prevent influenza replication and transmissibility in ferrets, but did attenuate influenza pathogenicity in mice. This molecular biocontainment approach should be applicable beyond influenza A virus to minimize the risk of experiments involving other pathogenic viruses.
Insights
Researchers developed a molecular biocontainment strategy using microRNA-192 to enhance biosafety in gain-of-function influenza A virus (H5N1) research. This method limits viral spread in specific hosts, reducing risks associated with dangerous virus studies.
Area of Science:
- Virology
- Molecular Biology
- Biotechnology
Background:
- Gain-of-function studies on influenza A virus (H5N1) have raised biosafety concerns due to potential human transmissibility.
- Influenza A virus H5N1 hemagglutinin mutations can confer ferret transmissibility, a surrogate for human transmission.
Purpose of the Study:
- To develop and assess a molecular biocontainment strategy to enhance biosafety in gain-of-function influenza virus research.
- To investigate the use of species-specific endogenous small RNAs to restrict influenza virus tropism.
Main Methods:
- Exploited species-specific microRNA (miRNA) targeting to restrict influenza virus tropism.
- Identified miR-192 as present in human and mouse respiratory cells but absent in ferrets.
- Engineered influenza A virus with miR-192 target sites.
Main Results:
- Engineered influenza A virus replicated and transmitted in ferrets without significant attenuation.
- Influenza virus with miR-192 target sites showed attenuated pathogenicity in mice.
- Demonstrated the potential of molecular biocontainment using endogenous small RNAs.
Conclusions:
- Molecular biocontainment using species-specific miRNAs offers a promising approach to enhance biosafety in gain-of-function influenza research.
- This strategy can be applied to minimize risks associated with experiments involving other pathogenic viruses.
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