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Genetic characterization of measles vaccine strains
Bettina Bankamp1, Makoto Takeda, Yan Zhang
1Division of Viral Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA. bbankamp@cdc.gov
Abstract:
The complete genomic sequences of 9 measles vaccine strains were compared with the sequence of the Edmonston wild-type virus. AIK-C, Moraten, Rubeovax, Schwarz, and Zagreb are vaccine strains of the Edmonston lineage, whereas CAM-70, Changchun-47, Leningrad-4 and Shanghai-191 were derived from 4 different wild-type isolates. Nucleotide substitutions were found in the noncoding regions of the genomes as well as in all coding regions, leading to deduced amino acid substitutions in all 8 viral proteins. Although the precise mechanisms involved in the attenuation of individual measles vaccines remain to be elucidated, in vitro assays of viral protein functions and recombinant viruses with defined genetic modifications have been used to characterize the differences between vaccine and wild-type strains. Although almost every protein contributes to an attenuated phenotype, substitutions affecting host cell tropism, virus assembly, and the ability to inhibit cellular antiviral defense mechanisms play an especially important role in attenuation.
Insights
Comparing measles vaccine genomes revealed genetic differences from wild-type virus. These substitutions in viral proteins are key to understanding measles vaccine attenuation and improving their efficacy.
Area of Science:
- Virology
- Genomics
- Vaccinology
Background:
- Measles remains a significant global health concern, necessitating effective vaccination strategies.
- Understanding the genetic basis of measles vaccine attenuation is crucial for vaccine development and efficacy.
Purpose of the Study:
- To compare the complete genomic sequences of nine measles vaccine strains with the Edmonston wild-type virus.
- To identify nucleotide and amino acid substitutions responsible for measles vaccine attenuation.
Main Methods:
- Whole-genome sequencing of nine measles vaccine strains and the Edmonston wild-type virus.
- Bioinformatic analysis to identify nucleotide substitutions in coding and noncoding regions.
- In vitro assays and recombinant viruses to characterize viral protein functions and attenuation mechanisms.
Main Results:
- Identified nucleotide substitutions across all coding and noncoding regions in vaccine strains compared to wild-type.
- Deduced amino acid substitutions in all eight viral proteins, indicating widespread genetic alterations.
- Highlighted the significant role of substitutions affecting host cell tropism, virus assembly, and immune evasion in attenuation.
Conclusions:
- Measles vaccine genomes exhibit substantial genetic divergence from wild-type strains.
- Multiple viral proteins contribute to the attenuated phenotype of measles vaccines.
- Specific substitutions influencing viral tropism, assembly, and immune evasion are critical for attenuation.
