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7. The transposable element-rich genome of the cereal pest Sitophilus oryzae

Author

Parisot, Nicolas, Vargas-Chávez, Carlos, Goubert, Clément, Baa-Puyoulet, Patrice, Balmand, Séverine, Beranger, Louis, Blanc, Caroline, Bonnamour, Aymeric, Boulesteix, Matthieu, Burlet, Nelly, Calevro, Federica, Callaerts, Patrick, Chancy, Théo, Charles, Hubert, Colella, Stefano, Da Silva Barbosa, André, Dell’Aglio, Elisa, Di Genova, Alex, Febvay, Gérard, Gabaldón, Toni, Galvão Ferrarini, Mariana, Gerber, Alexandra, Gillet, Benjamin, Hubley, Robert, Hughes, Sandrine, Jacquin-Joly, Emmanuelle, Maire, Justin, Marcet-Houben, Marina, Masson, Florent, Meslin, Camille, Montagné, Nicolas, Moya, Andrés, Ribeiro de Vasconcelos, Ana Tereza, Richard, Gautier, Rosen, Jeb, Sagot, Marie-France, Smit, Arian F. A., Storer, Jessica M., Vincent-Monegat, Carole, Vallier, Agnès, Vigneron, Aurélien, Zaidman-Rémy, Anna, Zamoum, Waël, Vieira, Cristina, Rebollo, Rita, Latorre, Amparo, and Heddi, Abdelaziz

Published
2021
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12. Colocalization and potential interactions of Endozoicomonas and chlamydiae in microbial aggregates of the coral Pocillopora acuta

Author

Maire, Justin, primary, Tandon, Kshitij, additional, Collingro, Astrid, additional, van de Meene, Allison, additional, Damjanovic, Katarina, additional, Gotze, Cecilie Ravn, additional, Stephenson, Sophie, additional, Philip, Gayle K., additional, Horn, Matthias, additional, Cantin, Neal E., additional, Blackall, Linda L., additional, and van Oppen, Madeleine J. H., additional

Published
2023
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14. Endosymbiont-containing germarium transcriptional survey in a cereal weevil depicts downregulation of immune effectors at the onset of sexual maturity

Author

Ferrarini, Mariana Galvão, primary, Vallier, Agnès, additional, Dell’Aglio, Elisa, additional, Balmand, Séverine, additional, Vincent-Monégat, Carole, additional, Debbache, Mériem, additional, Maire, Justin, additional, Parisot, Nicolas, additional, Zaidman-Rémy, Anna, additional, Heddi, Abdelaziz, additional, and Rebollo, Rita, additional

Published
2023
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16. Endosymbiont-containing germarium transcriptional survey in a cereal weevil depicts downregulation of immune effectors at the onset of sexual maturity.

Author

Galvão Ferrarini, Mariana, Vallier, Agnès, Dell’Aglio, Elisa, Balmand, Séverine, Vincent-Monégat, Carole, Debbache, Mériem, Maire, Justin, Parisot, Nicolas, Zaidman-Rémy, Anna, Heddi, Abdelaziz, and Rebollo, Rita

Subjects
CURCULIONIDAE, YOUNG adults, ESSENTIAL amino acids, RICE weevil, ANTIMICROBIAL peptides, PYRICULARIA oryzae
Abstract

Insects often establish long-term relationships with intracellular symbiotic bacteria, i.e., endosymbionts, that provide them with essential nutrients such as amino acids and vitamins. Endosymbionts are typically confined within specialized host cells called bacteriocytes that may form an organ, the bacteriome. Compartmentalization within host cells is paramount for protecting the endosymbionts and also avoiding chronic activation of the host immune system. In the cereal weevil Sitophilus oryzae, bacteriomes are present as a single organ at the larval foregut-midgut junction, and in adults, at the apex of midgut mesenteric caeca and at the apex of the four ovarioles. While the adult midgut endosymbionts experience a drastic proliferation during early adulthood followed by complete elimination through apoptosis and autophagy, ovarian endosymbionts are maintained throughout the weevil lifetime by unknown mechanisms. Bacteria present in ovarian bacteriomes are thought to be involved in the maternal transmission of endosymbionts through infection of the female germline, but the exact mode of transmission is not fully understood. Here, we show that endosymbionts are able to colonize the germarium in oneweek-old females, pinpointing a potential infection route of oocytes. To identify potential immune regulators of ovarian endosymbionts, we have analyzed the transcriptomes of the ovarian bacteriomes through young adult development, from one-day-old adults to sexually mature ones. In contrast with midgut bacteriomes, immune effectors are downregulated in ovarian bacteriomes at the onset of sexual maturation. We hypothesize that relaxation of endosymbiont control by antimicrobial peptides might allow bacterial migration and potential oocyte infection, ensuring endosymbiont transmission. [ABSTRACT FROM AUTHOR]

Published
2023
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21. Long-Term Heat Selection of the Coral Endosymbiont Cladocopium C1 acro (Symbiodiniaceae) Stabilizes Associated Bacterial Communities.

Author

Buerger, Patrick, Vanstone, Ruby T., Maire, Justin, and van Oppen, Madeleine J. H.

Subjects
BACTERIAL communities, CORALS, HIGH temperatures, GENETIC barcoding, METAGENOMICS, COMMUNITIES
Abstract

Heat-tolerant strains of the coral endosymbiont, Cladocopium C1acro (Symbiodiniaceae), have previously been developed via experimental evolution. Here, we examine physiological responses and bacterial community composition (using 16S rRNA gene metabarcoding) in cultures of 10 heat-evolved (SS) and 9 wild-type (WT) strains, which had been exposed for 6 years to 31 °C and 27 °C, respectively. We also examine whether the associated bacterial communities were affected by a three-week reciprocal transplantation to both temperatures. The SS strains had bacterial communities with lower diversities that showed more stability and lower variability when exposed to elevated temperatures compared with the WT strains. Amplicon sequence variants (ASVs) of the bacterial genera Labrenzia, Algiphilus, Hyphobacterium and Roseitalea were significantly more associated with the SS strains compared with the WT strains. WT strains showed higher abundance of ASVs assigned to the genera Fabibacter and Tropicimonas. We hypothesize that these compositional differences in associated bacterial communities between SS and WT strains also contribute to the thermal tolerance of the microalgae. Future research should explore functional potential between bacterial communities using metagenomics to unravel specific genomic adaptations. [ABSTRACT FROM AUTHOR]

Published
2022
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23. Intracellular bacteria are common and taxonomically diverse in cultured and in hospitealgal endosymbionts of coral reefs

Author

Maire, Justin, Girvan, Sam K, Barkla, Sophie E, Perez-Gonzalez, Alexis, Suggett, David J, Blackall, Linda L, and van Oppen, Madeleine J H

Abstract

Corals house a variety of microorganisms which they depend on for their survival, including endosymbiotic dinoflagellates (Symbiodiniaceae) and bacteria. While cnidarian–microorganism interactions are widely studied, Symbiodiniaceae–bacteria interactions are only just beginning to receive attention. Here, we describe the localization and composition of the bacterial communities associated with cultures of 11 Symbiodiniaceae strains from nine species and six genera. Three-dimensional confocal laser scanning and electron microscopy revealed bacteria are present inside the Symbiodiniaceae cells as well as closely associated with their external cell surface. Bacterial pure cultures and 16S rRNA gene metabarcoding from Symbiodiniaceae cultures highlighted distinct and highly diverse bacterial communities occur intracellularly, closely associated with the Symbiodiniaceae outer cell surface and loosely associated (i.e., in the surrounding culture media). The intracellular bacteria are highly conserved across Symbiodiniaceae species, suggesting they may be involved in Symbiodiniaceae physiology. Our findings provide unique new insights into the biology of Symbiodiniaceae.

Published
2021
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24. Chlamydiae as symbionts of photosynthetic dinoflagellates

Author

Maire, Justin, Collingro, Astrid, Tandon, Kshitij, Jameson, Vanta J, Judd, Louise M, Horn, Matthias, Blackall, Linda L, and van Oppen, Madeleine J H

Abstract

Chlamydiae are ubiquitous intracellular bacteria and infect a wide diversity of eukaryotes, including mammals. However, chlamydiae have never been reported to infect photosynthetic organisms. Here, we describe a novel chlamydial genus and species, Candidatus Algichlamydia australiensis, capable of infecting the photosynthetic dinoflagellate Cladocopiumsp. (originally isolated from a scleractinian coral). Algichlamydia australiensiswas confirmed to be intracellular by fluorescence in situhybridization and confocal laser scanning microscopy and temporally stable at the population level by monitoring its relative abundance across four weeks of host growth. Using a combination of short- and long-read sequencing, we recovered a high-quality (completeness 91.73% and contamination 0.27%) metagenome-assembled genome of A. australiensis. Phylogenetic analyses show that this chlamydial taxon represents a new genus and species within the Simkaniaceaefamily. Algichlamydia australiensispossesses all the hallmark genes for chlamydiae–host interactions, including a complete type III secretion system. In addition, a type IV secretion system is encoded on a plasmid and has previously been observed for only three other chlamydial species. Twenty orthologous groups of genes are unique to A. australiensis, one of which is structurally similar to a protein known from Cyanobacteriaand Archaeplastida involved in thylakoid biogenesis and maintenance, hinting at potential chlamydiae interactions with the chloroplasts of Cladocopiumcells. Our study shows that chlamydiae infect dinoflagellate symbionts of cnidarians, the first photosynthetic organism reported to harbor chlamydiae, thereby expanding the breadth of chlamydial hosts and providing a new contribution to the discussion around the role of chlamydiae in the establishment of the primary plastid.

Published
2024
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