Wide occurrence of measles virus subgenomic RNAs in attenuated live-virus vaccines
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1Department of Microbiology, University of Geneva Medical School, Switzerland.
Abstract:
Nine measles vaccine preparations, including four different viral strains, provided by eight different manufacturers were analysed by Northern blot for the nature of their nucleocapsid RNAs. Out of nine preparations, six were shown to contain subgenomic RNAs, along with the full length genomic RNA. Presence or absence of the subgenomic RNAs correlated strictly with the viral strains used. The role of the defective interfering particles in measles virus vaccine attenuation, and in its seroconversion efficacy upon vaccination, as well as the potential hazard of the presence of defective interfering particles in live-virus vaccine preparations, is discussed.
Insights
Northern blot analysis revealed subgenomic RNAs in six of nine measles vaccine preparations. These RNAs, linked to specific viral strains, may impact vaccine attenuation and efficacy.
Area of Science:
- Virology
- Vaccinology
- Molecular Biology
Background:
- Measles vaccines are crucial for preventing measles virus infection.
- The composition of live-virus vaccines, including measles vaccine preparations, can influence their performance.
- Defective interfering particles (DIPs) are known to affect viral replication and attenuation.
Purpose of the Study:
- To analyze the nucleocapsid RNA content of various measles vaccine preparations.
- To investigate the presence and nature of subgenomic RNAs in measles vaccines.
- To discuss the implications of subgenomic RNAs and DIPs for vaccine efficacy and safety.
Main Methods:
- Analysis of nine measles vaccine preparations from eight manufacturers.
- Utilized Northern blot technique to examine nucleocapsid RNA.
- Correlated RNA findings with specific viral strains used in the vaccines.
Main Results:
- Six out of nine measles vaccine preparations contained subgenomic RNAs alongside genomic RNA.
- The presence or absence of subgenomic RNAs strictly correlated with the viral strains employed.
- Identified potential defective interfering particles (DIPs) in the vaccine preparations.
Conclusions:
- Subgenomic RNAs, potentially indicative of DIPs, are present in a majority of analyzed measles vaccines.
- The viral strain is a key determinant for the presence of these subgenomic RNAs.
- Further research is warranted to understand the role of DIPs in measles vaccine attenuation, efficacy, and safety.