Parasites constrain within-population diversification while accelerating between-population divergence in an RNA replication system.

Abstract excerpt

Diversification of replicators from simple self-replicating RNA molecules is a major challenge in prebiotic evolution. In our previous evolution experiment using an RNA replication system derived from the Qβ phage, a single RNA species spontaneously diversified into multiple coexisting host and parasite RNA lineages through arms race dynamics, suggesting that host-parasite interactions may promote diversification...

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