A poliovirus temperature-sensitive RNA synthesis mutant located in a noncoding region of the genome.
Population
Mammalian cells transfected with an infectious poliovirus cDNA clone
Design
Preclinical
Authors
Discussion
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Implication
No immediate clinical implications; leaves open whether 3' NCR mutations drive persistent poliovirus infection in vivo.
Key Points
- Investigate the impact of an insertion mutation in the 3' noncoding region of poliovirus cDNA on RNA synthesis and viral persistence.
- Constructed an 8-base-pair insertion mutation within the 3' noncoding region of an infectious poliovirus cDNA clone.
- Transfected the mutated cDNA into mammalian cells to isolate viral mutants, evaluate temperature sensitivity, and perform genetic complementation assays.
- Transfection generated a temperature-sensitive RNA synthesis mutant that enabled mammalian cells to release virus in a temperature-dependent manner, establishing a persistent infection.
- The established cell line successfully complemented a noncapsid poliovirus mutant at the nonpermissive temperature, confirming viral protein synthesis in the absence of normal permissive replication.
Structured PICO
P
Population
Mammalian cells transfected with an infectious poliovirus cDNA clone
I
Intervention
8-base-pair insertion mutation in the 3' noncoding region of the poliovirus cDNA
O
Outcome
Temperature-sensitive RNA synthesis and viral release
An 8-base-pair insertion in the 3' noncoding region of poliovirus creates a temperature-sensitive RNA synthesis mutant capable of establishing a persistent viral infection in mammalian cells.
Cite This Study
Sarnow et al. (1986) studied this question.