Figure 7
From: Chance and necessity in the genome evolution of endosymbiotic bacteria of insects
Transcriptional changes due to genetic drift in experimentally evolved E. coli bacteria resembles main transcriptional changes in some endosymbiotic bacteria. In the final cell of E. coli subjected to experimental evolution under strong genetic drift, some important pathways show overexpression (in red) or downregulation (in blue) when comparing evolved transcriptomes against the ancestral transcriptome. These pathways resemble those observed in B. aphidicola, some of which are involved in the host–bacterium interaction, including synthesis of essential amino acids, and others are more linked to functions unrelated with the host, including the chaperone systems GroEL and DnaK, and those corresponding to the flagellum and bacteria motility.
