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Properties of lymphocytic choriomeningitis virus interfering particles
Abstract:
Lymphocytic choriomeningitis virus (LCM virus) interfering particles (IP) were generated in cultivated cells and their properties determined. Unlike true defective interfering (DI) particles, LCM virus IP did not show the phenomenon of enrichment and, consequently, passaging the virus undiluted did not result in their accumulation; in fact, more IP were produced during dilute passages. Furthermore, the progeny of each of 20 plaques contained high numbers of IP. On the basis of these and previous observations, we consider LCM virus IP not deletion mutants but by-products of virus synthesis.
Insights
Lymphocytic choriomeningitis virus (LCM virus) interfering particles (IP) are not deletion mutants. These LCM virus IPs are produced as by-products during virus synthesis, unlike typical defective interfering particles.
Area of Science:
- Virology
- Molecular Biology
Background:
- Lymphocytic choriomeningitis virus (LCMV) is a well-studied arenavirus.
- Defective interfering (DI) particles are known to arise during viral replication.
Purpose of the Study:
- To characterize the interfering particles (IP) of LCM virus.
- To determine if LCM virus IPs are true DI particles or by-products of replication.
Main Methods:
- Generation of LCM virus interfering particles (IP) in cell culture.
- Undiluted and diluted passaging of LCM virus.
- Analysis of viral progeny from individual plaques.
Main Results:
- LCM virus IPs did not exhibit enrichment during undiluted passaging, unlike true DI particles.
- Dilute passages of LCM virus resulted in higher production of IPs.
- Progeny from individual plaques consistently contained high numbers of IPs.
Conclusions:
- LCM virus IPs do not behave like canonical defective interfering particles.
- LCM virus IPs are likely by-products of viral synthesis rather than deletion mutants.
- Further research into viral by-product formation is warranted.