Genomic and molecular evolutionary dynamics of transcriptional response regulator genes in bacterial species of the Harveyi clade of Vibrio

• The genetic repertory of transcriptional response regulators in Harveyi clade species is conformed by 16 core and 38 accessory genes. • The TRR genes by species varies from 18 to 40 and could be related to genome size and phylogenetic position. • Natural selection could shape an ancestral state of conserved genes by purifying processes and the loss of non-conserved genes by diversifying processes. • Random genetic drift could be driving gene...