Evolution of H5N1 Cross-Species Transmission: Adaptive Mutations Driving Avian-to-Human Infection
Wenxin Man1,2, Lin Du2, Ying Liu2
1College of Life Science Northeast Forestry University Harbin China.
Advanced Genetics (Hoboken, N.J.)
|January 14, 2026
Summary
The H5N1 avian influenza virus poses a global health risk due to its ability to infect mammals. Key viral mutations enhance its transmissibility and immune evasion, necessitating ongoing surveillance and countermeasures.
Area of Science:
- Virology
- Molecular Biology
- Epidemiology
Background:
- H5N1 avian influenza, first detected in 1996, is a significant public health concern.
- It exhibits high pathogenicity and has demonstrated interspecies transmission, infecting birds, mammals, and humans.
- The virus's ability to breach species barriers poses a pandemic threat.
Purpose of the Study:
- To review the molecular mechanisms of H5N1 host adaptation.
- To identify key mutations in viral proteins (HA, NA, PB2) driving mammalian adaptation.
- To outline epidemiological trends and control strategies for H5N1.
Main Methods:
- Literature review synthesizing current knowledge on H5N1.
- Analysis of molecular mechanisms and genetic mutations in viral proteins.
- Examination of epidemiological data and dissemination patterns.
Main Results:
- Specific mutations (e.g., HA-Q226L, PB2-E627K) enhance H5N1 binding to human receptors and replication in mammalian cells.
- These mutations contribute to increased viral tropism, immune evasion, and antiviral resistance.
- Epidemiological data reveal global spread via migratory birds and trade routes.
Conclusions:
- H5N1 host adaptation is driven by specific molecular changes in viral proteins.
- Continued surveillance, broad-spectrum countermeasures, and international collaboration are crucial.
- Reducing the pandemic risk of H5N1 requires a multi-faceted approach.
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