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Monkeypox Virus Evolution before 2022 Outbreak
Emerging Infectious Diseases
|January 24, 2023
Summary
The 2022 mpox outbreak revealed significant genetic divergence in monkeypox virus, indicating new subclades. Increased G>A/C>T mutations, likely due to APOBEC3 editing, suggest viral adaptation and human-to-human transmission.
Area of Science:
- Virology
- Genomics
- Evolutionary Biology
Background:
- The 2022 mpox outbreak presented a unique opportunity to study viral evolution in real-time.
- Understanding the genetic dynamics of monkeypox virus (MPXV) is crucial for public health surveillance and response.
Discussion:
- Phylogenetic analysis revealed statistically significant divergence and the emergence of nascent subclades within MPXV genomes during the 2022 outbreak.
- A notable increase in G>A and C>T transitions was observed in recent MPXV genomes.
- This mutational pattern is strongly associated with the activity of apolipoprotein B mRNA editing enzyme catalytic polypeptide 3G (APOBEC3) deaminases.
Key Insights:
- The observed microevolutionary patterns suggest extensive community spread of mpox.
- APOBEC3-mediated editing appears to be a significant driver of MPXV genetic changes, indicating adaptation to a human host.
- The emergence of distinct subclades highlights the rapid evolutionary capacity of the virus.
Outlook:
- Continued genomic surveillance is essential to track further MPXV evolution and identify potential shifts in transmissibility or virulence.
- Investigating the precise mechanisms and impact of APOBEC3 editing on MPXV pathogenesis is warranted.
- These findings provide a foundation for predicting future viral adaptation and informing public health strategies against mpox and other zoonotic viruses.
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