RT Journal Article SR Electronic(1) A1 Pillonel, Trestan A1 Bertelli, Claire A1 Salamin, Nicolas A1 Greub, GilbertYR 2015 T1 Taxogenomics of the order Chlamydiales JF International Journal of Systematic and Evolutionary Microbiology, VO 65 IS Pt_4 SP 1381 OP 1393 DO https://doi.org/10.1099/ijs.0.000090 PB Microbiology Society, SN 1466-5034, AB Bacterial classification is a long-standing problem for taxonomists and species definition itself is constantly debated among specialists. The classification of strict intracellular bacteria such as members of the order Chlamydiales mainly relies on DNA- or protein-based phylogenetic reconstructions because these organisms exhibit few phenotypic differences and are difficult to culture. The availability of full genome sequences allows the comparison of the performance of conserved protein sequences to reconstruct Chlamydiales phylogeny. This approach permits the identification of markers that maximize the phylogenetic signal and the robustness of the inferred tree. In this study, a set of 424 core proteins was identified and concatenated to reconstruct a reference species tree. Although individual protein trees present variable topologies, we detected only few cases of incongruence with the reference species tree, which were due to horizontal gene transfers. Detailed analysis of the phylogenetic information of individual protein sequences (i) showed that phylogenies based on single randomly chosen core proteins are not reliable and (ii) led to the identification of twenty taxonomically highly reliable proteins, allowing the reconstruction of a robust tree close to the reference species tree. We recommend using these protein sequences to precisely classify newly discovered isolates at the family, genus and species levels., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijs.0.000090