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Updated: May 13, 2025
11:48
Generation, Amplification, and Titration of Recombinant Respiratory Syncytial Viruses
Published on: April 4, 2019
14.8K
Functional implications of respiratory syncytial virus F sequence variability: a comparative analysis using
Kim Stobbelaar1,2,3, Lotte Jacobs1, Francisco I Serrano-Cano1
1Laboratory of Microbiology, Parasitology and Hygiene, Faculty of Biomedical Sciences, University of Antwerp, Antwerp, Belgium.
Msphere
|April 14, 2025
Summary
Respiratory syncytial virus (RSV) fusion (F) protein sequence variation is limited but shows phenotypic differences between RSV-A and RSV-B strains. Continued surveillance of RSV F sequences and antibody sensitivity is crucial for effective prophylactics.
Area of Science:
- Virology
- Immunology
- Public Health
Background:
- Respiratory syncytial virus (RSV) is a significant global health concern, particularly for young children.
- Limited therapeutic options exist, but new prophylactics targeting the RSV fusion (F) glycoprotein have been licensed.
- Understanding F protein variability and its phenotypic impact is crucial for vaccine and prophylactic efficacy.
Purpose of the Study:
- To analyze the genomic and phenotypic variability of contemporary RSV isolates.
- To investigate how F protein sequence variations influence viral characteristics and susceptibility to monoclonal antibodies (mAbs).
- To assess the importance of ongoing RSV surveillance for prophylactic development.
Main Methods:
- Analysis of full F gene sequences from 105 contemporary RSV isolates from children with lower respiratory tract infections.
- Functional characterization of 20 selected isolates based on F antigenic site variation.
- Comparison of RSV-A and RSV-B strain characteristics, including syncytium formation and thermal stability.
Main Results:
- RSV-A strains exhibited higher genetic diversity than RSV-B strains.
- Sequence variability in mAb-binding sites did not fully explain differential mAb neutralization sensitivity.
- RSV-A strains showed larger syncytium size and lower syncytium frequency compared to RSV-B strains.
- Some RSV-A isolates demonstrated enhanced stability at higher temperatures.
Conclusions:
- Genomic and phenotypic variability in contemporary RSV isolates is generally limited but shows notable exceptions.
- Phenotypic differences between RSV subgroups highlight the need for clinical isolate-based evaluations.
- Continuous RSV surveillance, including sequencing and antibody sensitivity testing, is essential to monitor for and counter potential escape mutants and ensure prophylactic effectiveness.
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