Abstract
Abstract
Bacteria undergo asexual reproduction, but genetic exchange is common.
Current models posit that speciation of sexual bacteria is a gradual and long
process, and genetic exchanges decrease but never cease between nascent species.
Here, we show that in a panmictic bacterial lineage found in symbiosis with
invertebrate hosts across multi-marine ecosystems, a series of speciation events
occurred unusually fast with between-species genetic exchange approximating a
complete halt. The speciation process is too rapid to sort out ancestral
polymorphisms, giving rise to between-species phylogenetic incongruence at a
genome-wide scale. This novel bacterial speciation process leads to incomplete
lineage sorting, which to date has only been observed in eukaryotes but is
100-1000 times faster. Our finding allows for a more unified understanding of
the speciation process across prokaryotes and eukaryotes.
Publisher
Cold Spring Harbor Laboratory
Cited by
1 articles.
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