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Genetic resistance to flaviviruses
Margo A Brinton1, Andrey A Perelygin
1Biology Department, Georgia State University, Atlanta, Georgia 30303, USA.
Advances in Virus Research
|December 24, 2003
Summary
Mice resistant to flavivirus disease possess a specific gene, Oas1b, which produces a functional protein. Susceptible mice have a non-functional Oas1b protein, leading to higher virus levels and faster disease progression.
Area of Science:
- Immunology
- Genetics
- Virology
Background:
- Resistance to flavivirus-induced disease in mice is controlled by a single dominant autosomal gene.
- While most lab mice are susceptible, the resistant allele exists in wild populations globally.
- This resistance is specific to flaviviruses, affecting both mosquito- and tick-borne types.
Purpose of the Study:
- To identify the genetic basis of flavivirus resistance in mice.
- To understand the molecular mechanisms underlying flavivirus resistance.
Main Methods:
- Positional cloning was used to identify the resistance gene.
- Genetic sequencing was performed to compare resistant and susceptible mouse strains.
Main Results:
- The flavivirus resistance gene (Flv) was identified as Oas1b.
- Susceptible mice possess a truncated Oas1b protein due to a C820T mutation causing a premature stop codon.
- Resistant mice produce lower flavivirus titers, particularly in the brain, delaying disease onset and death.
Conclusions:
- The Oas1b gene plays a crucial role in conferring resistance to flavivirus infections in mice.
- The identified mutation in Oas1b is responsible for the susceptible phenotype in laboratory mice.
- Further research is needed to elucidate the precise mechanisms by which Oas1b confers resistance.