A standardized microinjection framework with hierarchical quantitative evaluation supports multi-genotype human...

Area of Science:

• Virology
• Zebrafish Embryo Models
• Infectious Disease Research

Background:

• Human norovirus (HuNoV) is a leading cause of gastroenteritis, necessitating robust models for studying its replication and pathogenesis.
• Technical variability in microinjection poses a significant challenge to establishing reproducible HuNoV infection models in zebrafish embryos.
• Understanding genotype-specific infection dynamics is crucial for developing effective antiviral strategies.

Purpose of the Study:

• To establish a reproducible and consistent zebrafish embryo model for multi-genotype human norovirus (HuNoV) replication.
• To address technical variability in microinjection, a critical bottleneck in current models.
• To systematically characterize HuNoV infection dynamics across different genotypes.

Main Methods:

• Developed a standardized microinjection framework using a hierarchical quantitative evaluation scheme.
• Minimized operator-dependent variability through a systematic approach.
• Validated the framework by assessing the correlation between injection efficiency and embryo survival.

Main Results:

• Achieved consistent, low-damage delivery of viral inoculum.
• Established stable replication models for five HuNoV genotypes (GII.2[P16], GII.4[P31], GII.4[P16], GII.17[P17], GII.3[P12]).
• Determined minimum effective inoculum titers and defined replication kinetics for each genotype.

Conclusions:

• Provided a comprehensive and standardized methodology for HuNoV research in zebrafish embryos.
• Significantly enhanced the reproducibility of HuNoV infection models.
• Established a robust platform for comparative studies of viral pathogenesis, host interactions, and antiviral efficacy across multiple norovirus genotypes.