The tRNAs are central components in translation. In addition, they are esse
ntial for replication of retroviruses: tRNAs bind to viral genomes through
their 3'-end sequences and act as primers for initiation of viral replicati
on. Here, I discuss the possibility that tRNAs also play a role in the hori
zontal transfer of bacterial pathogenicity islands between different pathog
ens. Such a role would implicate tRNAs in DNA recombination.