Evolutionary Trade-Off Exists Between Advantage and Disadvantage
Some viruses’ ability to exploit the human body’s own defenses to increase their replication may be both a blessing and curse, according to the findings of a study conducted by researchers at the Johns Hopkins Bloomberg School of Public Health. The process is known as antibody-dependent enhancement. Scientists believe antibody-dependent enhancement may allow the dengue virus to grow more rapidly in people who were previously infected and have partial but incomplete immunity to the virus. Enhanced virus replication triggers a more deadly, hemorrhagic form of the disease. A study published in the online edition of Proceedings of the National Academy of Sciences suggests that antibody-dependent enhancement offers an evolutionary trade-off between advantage and disadvantage for the dengue virus. The findings could one day lead to new strategies for developing and deploying vaccines.
Using computational models based on epidemic theory, the researchers examined the dynamic role antibody-dependent enhancement plays in the spread of dengue viruses. They concluded that when antibody-dependent enhancement triggered small increases in transmission it gave viruses an edge over other co-circulating dengue viruses that did not experience enhancement. Counter-intuitively, larger increases in transmission resulted in more extinctions of the enhanced virus.
Tim Parsons | EurekAlert!
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