What is the reassortment of influenza?
What is the reassortment of influenza?
Reassortment is the process by which influenza viruses swap gene segments. This genetic exchange is possible due to the segmented nature of the viral genome and occurs when two differing influenza viruses co-infect a cell.
What viruses undergo reassortment?
In theory, any virus with a segmented genome can undergo reassortment. Among viruses that infect vertebrates, those that carry segmented genomes belong to the Arenaviridae, Birnaviridae, Bunyavirales, Orthomyxoviridae, Picobirnaviridae, and Reoviridae.
Why is reassortment an important process in the evolution of influenza viruses?
The reassortment is an important evolutionary mechanism which can result in antigenic shifts that modify host range, pathology, and transmission of the influenza A viruses. In this process, the influenza virus strain with epidemic and/or pandemic potential can be created.
What is reassortment vaccine?
A vaccine made by combining antigens from several viruses or from several strains of the same virus.
Where does genetic reassortment occur?
Reassortment is a form of genetic recombination that occurs in RNA viruses with segmented genomes, regardless of whether they are single- or double-stranded and whether these involve few or many segments.
Is reassortment a mutation?
2.12 Mutation, Recombination, and Reassortment as Individual and Combined Evolutionary Forces. Mutation, recombination, and segment reassortment contribute to the evolution of most DNA and RNA viruses.
What role does viral reassortment play in flu pandemics?
Genetic reassortment causes major changes in the influenza A virus, resulting in a genetic shift in the virus and epidemics. Recombination occurs among bacteria by a process known as horizontal gene transfer (described in Section 5.6), which also has been observed among virus and fungi.
What is mechanism of genetic reassortment in viruses?
2.2 Reassortment Reassortment of segmented RNA viruses is a mechanism by which cognate genome segments are exchanged in progeny viruses upon infection of a single cell by two or more closely related virus strains. When these viruses contain different cogent genes, new genotype constellations may emerge.
How often does reassortment of influenza viruses occur?
How often does reassortment of influenza viruses occur? We know that reassortment occurs frequently in nature. Fortunately, reassortment rarely results in a virus with pandemic potential, though it has done so at least twice in the 20th century.
Is reassortment mutation?
When does reassortment occur meiosis?
Genetic Reassortment Occurs during prophase 1 of meiosis.
Can Type B influenza viruses undergo reassortment?
Reassortment can only occur between influenza viruses of the same type. Why influenza A viruses never exchange RNA segments with influenza B or C viruses is not understood.
