1932

Abstract

Diverse prokaryotes produce gene transfer agents (GTAs), which are bacteriophage-like particles that exclusively package pieces of the producing cell's genome and transfer them to other cells. There are clear evolutionary connections between GTAs and phages, but GTAs have properties that lead us to suggest they are more than simply defective phages and instead provide a selective advantage for the producing organisms. The five types of currently known GTAs are genetically distinct, indicating multiple instances of convergent evolution. GTA production can be regulated by the producing organism and coordinated to coincide with development of the capability to receive DNA from GTAs. Recent discoveries of the genetic basis of GTA production in the bacterium and characterization of novel phages that possess homologs of this GTA's structural and regulatory genes have provided important new connections among these elements and highlight the tangled evolutionary relationships within the phageome.

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2017-09-29
2024-06-17
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