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endosymbionts

  • Open Access
    The Hypercomplex Genome of an Insect Reproductive Parasite Highlights the Importance of Lateral Gene Transfer in Symbiont Biology
    Observation | Ecological and Evolutionary Science
    The Hypercomplex Genome of an Insect Reproductive Parasite Highlights the Importance of Lateral Gene Transfer in Symbiont Biology

    The biology of many bacteria is critically dependent on genes carried on plasmid and phage mobile elements. These elements shuttle between microbial species, thus providing an important source of biological innovation across taxa. It has recently been recognized that mobile elements are also important in symbiotic bacteria, which form long-lasting interactions with their host. In this study, we report a bacterial symbiont genome that...

    Crystal L. Frost, Stefanos Siozios, Pol Nadal-Jimenez, Michael A. Brockhurst, Kayla C. King, Alistair C. Darby, Gregory D. D. Hurst
  • Open Access
    Cicada Endosymbionts Have tRNAs That Are Correctly Processed Despite Having Genomes That Do Not Encode All of the tRNA Processing Machinery
    Research Article | Host-Microbe Biology
    Cicada Endosymbionts Have tRNAs That Are Correctly Processed Despite Having Genomes That Do Not Encode All of the tRNA Processing Machinery

    The smallest bacterial genomes, in the range of about 0.1 to 0.5 million base pairs, are commonly found in the nutritional endosymbionts of insects. These tiny genomes are missing genes that encode proteins and RNAs required for the translation of mRNAs, one of the most highly conserved and important cellular processes. In this study, we found that the bacterial endosymbionts of cicadas have genomes which encode incomplete tRNA sets and...

    James T. Van Leuven, Meng Mao, Denghui D. Xing, Gordon M. Bennett, John P. McCutcheon
  • Open Access
    Is <span class="named-content genus-species" id="named-content-1">Anopheles gambiae</span> a Natural Host of <em>Wolbachia</em>?
    Observation | Host-Microbe Biology
    Is Anopheles gambiae a Natural Host of Wolbachia?

    Anopheles gambiae mosquitos are the main vectors of malaria, threatening around half of the world’s population. The bacterial symbiont Wolbachia can interfere with disease transmission by other important insect vectors, but until recently, it was thought to be absent from natural A. gambiae populations. Here, we critically analyze the genomic,...

    Ewa Chrostek, Michael Gerth
  • Open Access
    Symbiont-Mediated Defense against <span class="named-content genus-species" id="named-content-1">Legionella pneumophila</span> in Amoebae
    Research Article | Host-Microbe Biology
    Symbiont-Mediated Defense against Legionella pneumophila in Amoebae

    Bacterial pathogens are generally investigated in the context of disease. To prevent outbreaks, it is essential to understand their lifestyle and interactions with other microbes in their natural environment. Legionella pneumophila is an important human respiratory pathogen that survives and multiplies in biofilms or intracellularly within protists, such as amoebae....

    Lena König, Cecilia Wentrup, Frederik Schulz, Florian Wascher, Sarah Escola, Michele S. Swanson, Carmen Buchrieser, Matthias Horn
  • Open Access
    Changes in Endosymbiont Complexity Drive Host-Level Compensatory Adaptations in Cicadas
    Research Article | Host-Microbe Biology
    Changes in Endosymbiont Complexity Drive Host-Level Compensatory Adaptations in Cicadas

    Sap-feeding insects critically rely on one or more bacteria or fungi to provide essential nutrients that are not available at sufficient levels in their diets. These microbes are passed between insect generations when the mother places a small packet of microbes into each of her eggs before it is laid. We have previously described an unusual lineage fragmentation process in a nutritional endosymbiotic bacterium of cicadas called ...

    Matthew A. Campbell, Piotr Łukasik, Mariah C. Meyer, Mark Buckner, Chris Simon, Claudio Veloso, Anna Michalik, John P. McCutcheon
  • Open Access
    Research Article
    Life Cycle, Ultrastructure, and Phylogeny of New Diplonemids and Their Endosymbiotic Bacteria

    We describe the morphology, behavior, and life cycle of two new Diplonema species that established a relationship with two Holospora-like bacteria in the first report of an endosymbiosis in diplonemids. Both endosymbionts reside in the cytoplasm and the mitochondrion, which establishes an extremely rare case. Within their life cycle, the diplonemids undergo transformation from a trophic to a sessile and eventually a...

    Daria Tashyreva, Galina Prokopchuk, Jan Votýpka, Akinori Yabuki, Aleš Horák, Julius Lukeš
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