Fig. 2: Phylogeny and comparative analysis of deep-branching Rickettsiales genomes.
From: The evolutionary origin of host association in the Rickettsiales
a, Rickettsiales species tree based on a dataset of 116 marker genes of which the most heterogeneous sites were removed, highlighting the phylogenetic position of Gamibacteraceae (orange shading), Athabascaceae (blue shading) and Mitibacteraceae (green shading). The tree was inferred using PhyloBayes (CAT+LG+Γ4, 20,000 generations with a burn-in of 5,000 generations). Support values correspond to posterior probabilities and are only shown for values below 1. See Supplementary Fig. 7 for the complete tree including the outgroup. b–f, Distribution of environmental Gamibacteraceae (b) and Mitibacteraceae sequences (c) obtained from the NCBI nt database. Colours represent the sequences’ source environments. For each genome, the observed genome size in Mbp (d), with estimated genome size in dark grey shading, the GC content (e) and the coding density, calculated as the total length of protein-coding genes divided by the genome size (f), are shown. Source data for graphs in d–f can be found in Supplementary Data 3.
