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Human Rotaviruses of Multiple Genotypes Acquire Conserved VP4 Mutations during Serial Passage
Maximilian H Carter1, Jennifer Gribble2, Julia R Diller1
1Department of Pediatrics, Vanderbilt University Medical Center, Nashville, TN 37232, USA.
Viruses
|June 27, 2024
Summary
Researchers adapted human rotaviruses to cell cultures, identifying conserved mutations in the VP4 attachment protein. This suggests a common adaptation mechanism that could aid in studying rotavirus and developing vaccines.
Area of Science:
- Virology
- Molecular Biology
- Cell Biology
Background:
- Human rotaviruses have limited cell tropism and poor replication in vitro.
- The VP4 attachment protein is a critical determinant of rotavirus tropism.
- Previous adaptation studies focused on single rotavirus genotypes.
Purpose of the Study:
- To investigate conserved adaptation mechanisms of multiple human rotavirus genotypes in cell culture.
- To identify mutations in the VP4 protein associated with improved replication in MA104 cells.
Main Methods:
- Serial passaging of 50 human rotavirus clinical specimens (five genotypes) in monkey kidney cells (primary and MA104).
- Culturing and antigen detection to obtain adapted rotavirus lineages.
- Illumina next-generation sequencing to identify genetic variants, particularly in VP4.
Main Results:
- 25 adapted rotavirus lineages were obtained from 13 specimens, showing increased replication in MA104 cells over passages.
- Identified 28 conserved VP4 mutations for P[8] rotaviruses and 12 conserved mutations across all five genotypes.
- These mutations suggest a conserved mechanism for human rotavirus adaptation to MA104 cells.
Conclusions:
- Human rotaviruses share conserved adaptation mechanisms when cultured in MA104 cells.
- Understanding these mechanisms can facilitate rotavirus research and vaccine production.
- The identified VP4 mutations provide insights into rotavirus host-cell interactions.
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