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Updated: Jun 11, 2026
Assays for the Specific Growth Rate and Cell-binding Ability of Rotavirus
Published on: January 28, 2019
Complete genome sequence analysis of candidate human rotavirus vaccine strains RV3 and 116E
Christine M Rippinger1, John T Patton, Sarah M McDonald
1Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.
Insights
Rotaviruses (RVs) cause severe infant gastroenteritis. Researchers sequenced neonatal RV strains RV3 and 116E, identifying key genetic residues for vaccine development and understanding newborn infections.
Area of Science:
- Virology
- Molecular Biology
- Vaccinology
Background:
- Rotaviruses (RVs) are a leading cause of severe gastroenteritis in infants and young children globally.
- Neonatal RV strains, such as RV3 (G3P[6]) and 116E (G9P[11]), are being developed as live-attenuated vaccines.
- Understanding the genetic basis of RV attenuation is crucial for vaccine efficacy.
Purpose of the Study:
- To sequence and compare the genomes of cell culture-adapted neonatal rotavirus strains RV3 and 116E.
- To identify specific amino acid residues contributing to RV attenuation and vaccine efficacy.
- To investigate VP4 protein residues associated with neonatal versus infant rotavirus infection.
Main Methods:
- Whole-genome sequencing of double-stranded RNA from RV3 and 116E.
- Amino acid sequence alignments and comparative analysis with other RV strains.
- Structural prediction analysis to identify key residues.
Main Results:
- The study identified specific amino acid residues in RV3 and 116E potentially responsible for their attenuated nature.
- Key residues influencing vaccine efficacy were pinpointed through comparative genomics.
- Specific VP4 protein residues were found to correlate with RV3's ability to infect newborns.
Conclusions:
- The identified molecular determinants enhance understanding of RV3 and 116E attenuation.
- These findings are vital for the continued development and optimization of rotavirus vaccine candidates.
- The research provides insights into strain-specific tropism in neonatal rotavirus infections.
Abstract:
Rotaviruses (RVs) cause severe gastroenteritis in infants and young children; yet, several strains have been isolated from newborns showing no signs of clinical illness. Two of these neonatal strains, RV3 (G3P[6]) and 116E (G9P[11]), are currently being developed as live-attenuated vaccines. In this study, we sequenced the eleven-segmented double-stranded RNA genomes of cell culture-adapted RV3 and 116E and compared their genes and protein products to those of other RVs. Using amino acid alignments and structural predictions, we identified residues of RV3 or 116E that may contribute to attenuation or influence vaccine efficacy. We also discovered residues of the VP4 attachment protein that correlate with the capacity of some P[6] strains, including RV3, to infect newborns versus older infants. The results of this study enhance our understanding of the molecular determinants of RV3 and 116E attenuation and are expected to aid in the ongoing development of these vaccine candidates.
