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Genetic relationship between an influenza A and a B virus
The Journal of General Virology
|November 1, 1977
Summary
Influenza A and B viruses share significant base sequence homology across RNA segments, suggesting a common ancestor. Conserved regions in specific influenza A segments match those in influenza B, highlighting evolutionary links.
Area of Science:
- Virology
- Molecular Biology
- Evolutionary Biology
Background:
- Fowl plague virus (FPV) is an avian influenza A virus.
- Influenza B viruses are distinct from influenza A viruses.
- Understanding inter-subtype viral relationships is crucial for public health.
Purpose of the Study:
- To determine the base sequence homology between fowl plague virus (FPV) RNA segments and an influenza B virus.
- To investigate the evolutionary relationship between influenza A and B viruses.
Main Methods:
- RNA-RNA hybridization using 32P-labelled FPV RNA segments.
- Analysis of base sequence homology between influenza A (FPV, virus N) and influenza B viral RNA.
Main Results:
- Significant base sequence homology (18-50%) was found between all eight FPV RNA segments and influenza B virus complementary RNA (cRNA).
- Segment 8 of virus N also showed homology with the influenza B strain's cRNA.
- Conserved regions in segments 4, 6, and 8 of influenza A strains were identical to corresponding regions in the tested influenza B virus.
Conclusions:
- Influenza A and B viruses likely share a common ancestor.
- Evidence suggests a shared evolutionary origin and conserved genetic elements between influenza A and B viruses.