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Pathogenesis of temperature-sensitive mutants of sindbis virus in the embryonated egg. II. Control of the infectious
Abstract:
Viral infection in the embryonated egg was controlled through appropriate temperature shifts. Through such control of the infection, certain groups of key tissues were implicated in the pathogenic processes that lead to death of the embryo, whereas other tissues were eliminated as relatively unimportant. Temperature shift-down experiments suggested that some mutants could resume the infectious process after relatively long periods (ribonucleic acid-negative mutants, Sts-4 and Sts-17) at the nonpermissive temperature, whereas others (RNA-positive mutants, Sts-2 and Sts-10) could not resume infection, even after a relatively short period at the nonpermissive temperature.
Insights
Viral infections in embryonated eggs were managed using temperature shifts. This revealed key tissues involved in embryo death and identified viral mutants that could or could not resume infection post-temperature change.
Area of Science:
- Virology
- Developmental Biology
- Genetics
Background:
- Viral infections pose a significant threat to embryonic development.
- Understanding host-pathogen interactions is crucial for controlling viral pathogenesis.
Purpose of the Study:
- To investigate the role of specific tissues in viral pathogenesis within embryonated eggs.
- To characterize the behavior of different viral mutants under varying temperature conditions.
Main Methods:
- Utilizing temperature shifts to control viral infection in embryonated eggs.
- Analyzing tissue involvement in embryo mortality during infection.
- Conducting temperature shift-down experiments with distinct viral mutants (RNA-negative and RNA-positive).
Main Results:
- Specific tissues were identified as critical in the pathogenic process leading to embryo death.
- Ribonucleic acid-negative mutants (Sts-4, Sts-17) could resume infection after prolonged nonpermissive temperatures.
- Ribonucleic acid-positive mutants (Sts-2, Sts-10) were unable to resume infection even after short nonpermissive periods.
Conclusions:
- Temperature shifts are effective in managing viral infections in embryonated eggs and dissecting pathogenic mechanisms.
- Viral RNA status influences the ability of mutants to recover from nonpermissive temperature conditions, impacting infectivity.
