1887

Abstract

Current phylogenies of the intracellular bacteria belonging to the genus identify six major clades (A–F), termed ‘supergroups’, but the branching order of these supergroups remains unresolved. Supergroups A, B and E include most of the wolbachiae found thus far in arthropods, while supergroups C and D include most of those found in filarial nematodes. Members of supergroup F have been found in arthropods (i.e. termites), and have previously been detected in the nematode , a causative agent of human filariasis. To resolve the phylogenetic positions of from spp., and other novel strains from the flea and the filarial nematode , the authors generated new DNA sequences of the genes encoding citrate synthase (), heat-shock protein 60 (), and the cell division protein . Phylogenetic analysis confirmed the designation of from spp. as a member of the F supergroup. In addition, it was found that divergent lineages from and lack any clear affiliation with known supergroups, indicating further genetic diversity within the genus. Finally, although the data generated did not permit clear resolution of the root of the global tree, the results suggest that the transfer of spp. from arthropods to nematodes (or vice versa) probably occurred more than once.

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2005-12-01
2020-03-28
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