Results 31 to 40 of about 3,759 (166)

Gene gain and loss events in Rickettsia and Orientia species

Biology Direct, 2011
Background Genome degradation is an ongoing process in all members of the Rickettsiales order, which makes these bacterial species an excellent model for studying reductive evolution through interspecies variation in genome size and gene content. In this
Raoult Didier, El Karkouri Khalid, Merhej Vicky, Georgiades Kalliopi, Pontarotti Pierre   +4 more
doaj   +1 more source

The “Other” Rickettsiales : an Overview of the Family “ Candidatus Midichloriaceae”

Applied and Environmental Microbiology, 2022
Among endosymbiotic bacterial lineages, few are as intensely studied as Rickettsiales , which include the causative agents of spotted fever, typhus, and anaplasmosis. However, an important subgroup called “ Candidatus Midichloriaceae” receives little attention despite accounting for a third ...
Daniele Giannotti, Vittorio Boscaro, Filip Husnik, Claudia Vannini, Patrick J. Keeling   +4 more
openaire   +3 more sources

An automated approach for the identification of horizontal gene transfers from complete genomes reveals the rhizome of Rickettsiales

BMC Evolutionary Biology, 2012
Background Horizontal gene transfer (HGT) is considered to be a major force driving the evolutionary history of prokaryotes. HGT is widespread in prokaryotes, contributing to the genomic repertoire of prokaryotic organisms, and is particularly apparent ...
Le Phuong, Ramulu Hemalatha, Guijarro Laurent, Paganini Julien, Gouret Philippe, Chabrol Olivier, Raoult Dider, Pontarotti Pierre   +7 more
doaj   +1 more source

Ehrlichia chaffeensis proteomic profiling reveals distinct expression patterns of infectious and replicating forms

Frontiers in Cellular and Infection Microbiology
Ehrlichia chaffeensis is a tick-transmitted rickettsial pathogen responsible for causing human monocytic ehrlichiosis (HME). The pathogen’s developmental cycle includes infectious dense-core cells (DCs) and non-infectious replicating cells (RCs ...
Chandramouli Kondethimmanahalli, Roman R. Ganta, Roman R. Ganta   +2 more
doaj   +1 more source

tRNA signatures reveal a polyphyletic origin of SAR11 strains among alphaproteobacteria.

PLoS Computational Biology, 2014
Molecular phylogenetics and phylogenomics are subject to noise from horizontal gene transfer (HGT) and bias from convergence in macromolecular compositions.
Katherine C H Amrine, Wesley D Swingley, David H Ardell   +2 more
doaj   +1 more source

Rediscovering the genus Lyticum, multiflagellated symbionts of the order Rickettsiales [PDF]

Scientific Reports, 2013
AbstractAmong the bacterial symbionts harbored by the model organism Paramecium, many still lack a recent investigation that includes a molecular characterization. The genus Lyticum consists of two species of large-sized bacteria displaying numerous flagella, despite their inability to move inside their hosts' cytoplasm.
BOSCARO, VITTORIO, Martina Schrallhammer, Konstantin A. Benken, Sascha Krenek, Franziska Szokoli, Thomas U. Berendonk, Michael Schweikert, VERNI, FRANCO, Elena V. Sabaneyeva, PETRONI, GIULIO   +9 more
openaire   +3 more sources

Rickettsia parkeri (Rickettsiales: Rickettsiaceae) in the Sky Islands of West Texas [PDF]

Journal of Medical Entomology, 2020
Abstract Rickettsia parkeri, a tick-borne pathogen distributed throughout several countries of the Americas, causes a mild to moderately severe, eschar-associated spotted fever rickettsiosis. Although most U.S. cases of R. parkeri rickettsiosis are reported from southeastern states, some have been reported recently from remote regions of
Christopher D, Paddock, Joy A, Hecht, Amy N, Green, Kenneth A, Waldrup, Pete D, Teel, Sandor E, Karpathy, Tammi L, Johnson   +6 more
openaire   +2 more sources

Anaplasma platys and Rickettsia massiliae in Rhipicephalus sanguineus sensu stricto ticks collected on dogs in the Patagonian region of Argentina

Parasitology
The aim of this study was to examine the presence of tick-borne rickettsial bacteria in Rhipicephalus sanguineus sensu stricto ticks collected from dogs in the Patagonian region of Argentina.
Lara M. I. Maas, Marina Winter, Verónica Herrmann, Sergio D. Abate, Anna Obiegala, Santiago Nava, Patrick S. Sebastian   +6 more
doaj   +1 more source

A 10-year surveillance of Rickettsiales (Rickettsia spp. and Anaplasma phagocytophilum) in the city of Hanover, Germany, reveals Rickettsia spp. as emerging pathogens in ticks

Parasites & Vectors, 2017
Background Rickettsiales (Rickettsia spp. and Anaplasma phagocytophilum) transmitted by ticks are considered (re-)emerging pathogens posing a risk to public health.
Katrin Blazejak, Elisabeth Janecek, Christina Strube   +2 more
doaj   +1 more source

Environmental Metagenomic Assemblies Reveal Seven New Highly Divergent Chlamydial Lineages and Hallmarks of a Conserved Intracellular Lifestyle

Frontiers in Microbiology, 2018
The Chlamydiae phylum exclusively encompasses bacteria sharing a similar obligate intracellular life cycle. Existing 16S rDNA data support a high diversity within the phylum, however genomic data remain scarce owing to the difficulty in isolating strains
Trestan Pillonel, Claire Bertelli, Gilbert Greub   +2 more
doaj   +1 more source