Cellular Dialogues in the Holobiont

When does symbiosis begin? Bacterial cues necessary for metamorphosis in the marine polychaete Hydroides elegansThe symbiosis spaceChemical cues mediate symbiotic interactionsHow do specific symbiotic interactions begin? Examples from the pre-symbiosis spaceBacterially induced metamorphosis of marine invertebrate animalsBacterial induction of metamorphosis in Hydroides elegansIdentification of larval metamorphic cues from biofilm bacteriaHow variability of inductive bacteria and identified settlement cues relate to variable larval settlement and recruitmentLipopolysaccharide mediates both symbiotic and pre-symbiotic interactionsConclusionReferencesThe language of symbiosis: Insights from protist biologyIntroductionCytoplasm as microcosmEukaryotes inside eukaryotes (inside other eukaryotes)Ectosymbiosis: It’s a jungle out thereMicrobial symbioses: Power struggles in time and spaceConclusionAcknowledgmentsReferencesTrichoplax and its bacteria: How many are there? Are they speaking?IntroductionHow many symbionts are known to be present and where do they occur?Do all placozoans harbor both G. incantans and R. eludens?Intracellular locations of the placozoan symbiontsUnusual mitochondria in placozoan fiber cells and their possible relationship to symbiosisMolecular inferences on the nature of the Trichoplax-bacteria symbiosesHow are the bacterial symbionts of placozoans transmitted between generations?Some big questions remaining and suggestions for their resolutionAcknowledgmentsReferencesDecoding cellular dialogues between sponges, bacteria, and phagesIntroductionHost–bacteria dialogueSponge immune receptorsMicrobe associated molecular patterns (MAMPs)Bacteria–bacteria dialogueQuorum sensingQuorum quenchingPhage-bacteria–host dialoguePhage diversity and host-specificityAnkyphages aid symbionts in immune evasionConclusions and future perspectivesAcknowledgmentsReferencesSymbiotic interactions in the holobiont HydraIntroductionInteractions between Hydra viridissima and the Chlorella photobiontLocation and transmission of the photobiontMutual benefitsEstablishment and maintenance of the Chlorella-Hydra symbiosisMolecular mechanisms involved in maintaining the symbiosisInteractions between Hydra and symbiotic bacteriaSpatial localization of the bacteria in the Hydra hostBacteria provide protection against fungal infectionThe innate immune system shapes the host microbiomeCrosstalk between innate immunity and stem cell factorsCrosstalk between the microbiota and the nervous systemEffect of bacteria on host physiologyConclusion: Hydra, an excellent model to understand inter-species interactionsAcknowledgmentsReferencesHydra and Curvibacter: An intimate crosstalk at the epithelial interfaceIntroductionHydra and Curvibacter: The ideal duo to understand inter-kingdom communicationsSpatial localization and transmission of CurvibacterEstablishment and carrying capacity of Curvibacter colonizationCurvibacter function in the Hydra metaorganismInter-kingdom communication between Hydra and CurvibacterOutlookAcknowledgmentsReferencesThe coral holobiont highlights the dependence of cnidarian animal hosts on their associated microbesIntroduction: The coral holobiont as an ecosystem engineer and its reliance on associated microbesThe coral–Symbiodiniaceae relationshipSymbiodiniaceae: Micro-algal engines of the coral holobiont machineryInnate immunity, symbiosis sensing, and cell signalingCoral bleaching: The breakdown of the coral–Symbiodiniaceae relationshipSymbiodiniaceae–bacteria relationshipsDiversity and function of microbes associated with the coral hostThe host as a habitatDiversity of coral-associated bacteria and interspecies interactionsAcquisition of bacterial associates and their roles in early coral life-stagesCoral probioticsContribution of bacteria to holobiont nutrient cyclingArchaea associated with the coral holobiontProtists and fungi associated with the coral holobiontSummary and OutlookReferencesExtra-intestinal regulation of the gut microbiome: The case of C. elegans TGFß/SMA signalingIntroduction: Caenorhabditis elegans as a model for studying the holobiontThe C. elegans gut microbiome and the factors that shape itThe intestinal nicheHost immunity and its role in shaping the intestinal nicheMultitissue contributions of TGFß signaling control anterior gut commensal abundance and functionTGFß signaling and cell nonautonomous regulation of intestinal functionConclusions and future prospects: Convergence with other systems of host–symbiont interactionsAcknowledgmentsReferencesMultiple roles of bacterially produced natural products in the bryozoan Bugula neritinaIntroductionBryozoans, Bugula spp., and Bugula neritinaBryostatinsBryostatin production by the bacterial symbiont of B. neritinaDefensive role of bryostatinsImpacts of symbiont and symbiont-produced metabolites on host physiologyBryostatins and symbionts in closely related generaFuture directionsAcknowledgmentsReferencesThe molecular dialogue through ontogeny between a squid host and its luminous symbiontIntroductionFeatures of the Euprymna scolopes-Vibrio fischeri association as a model symbiosisHost activities before symbiont colonization: Embryogenesis and early posthatchingEarly posthatching activity that mediates species and strain specificity of the associationColonization and early developmentThe basis of a stable symbiosis: Daily rhythms and maturation of the symbiotic organConclusionsAcknowledgmentsReferencesEvolving integrated multipartite symbioses between plant-sap feeding insects (Hemiptera) and their endosymbiontsIntroductionRoles of Hemipteran symbionts: Nutrition and beyondGenome evolution in Hemipteran symbiontsSymbiont bearing organs: Transmission and developmentIntracellular symbioses: Transovarial transmission and bacteriome developmentExtracellular symbioses: External transmission and the midgutMaintaining and regulating microbial symbiontsEvolution of mechanisms to maintain and regulate symbiontsSymbiont self-help and self-regulationSymbiont-symbiont supportHost support and regulation of nutritional synthesis in symbiontsHost support and regulation of other symbiont cell functionsConclusionReferencesSymbiosis for insect cuticle formationIntroductionWeevil–Nardonella endosymbiosisNardonella genome is extremely reduced and specialized for tyrosine synthesisNardonella endosymbiotic system in Pachyrhynchus infernalisNardonella-harboring bacteriome as a tyrosine-producing organSuppression of Nardonella by antibiotic and its effects on tyrosine and DOPA provisioningContribution of Nardonella to adult cuticle formation in Pachyrhynchus infernalisIncomplete tyrosine synthesis pathway of Nardonella and complementation by host genesInsights from weevil-Nardonella symbiosis: Host’s final step control over symbiont’s metabolic pathwayInsights from weevil-Nardonella symbiosis: How do symbiont replacements proceed?Symbiosis for insect cuticle formation: General phenomena across diverse insect taxaConclusion and perspectiveAcknowledgmentsReferencesMicrobial determinants of folivory in insectsIntroductionDeconstructing the plant cell wallSymbiont-mediated evasion of plant defensesNiche preservationConclusionsReferencesRight on cue: Microbiota promote plasticity of zebrafish digestive tractIntroductionDevelopment under immune surveillanceDevelopmental plasticity at the luminal interfaceBeyond the lumen: A secreted bacterial protein impacts pancreas developmentConclusionsReferencesUncovering the history of intestinal host–microbiome interactions through vertebrate comparative genomicsIntroductionA history of symbiotic interactions captured within microbial and host genomesCapturing symbiotic signals within coding regions of the host genomeUncovering specific symbiotic signals in host transcriptional programsSpecific symbiotic signals within regulatory regions linked to microbiota-regulated genesEvolutionary conservation of cis-regulatory regionsA case study—conserved microbial suppression of Angptl4ProspectusReferencesMolecular interactions of microbes and the plant phyllosphere: The phyllosphere-microbiome is shaped by the interplay of secreted microbial molecules and the plant immune systemIntroduction: Multi-partite microbial interactions in the plant phyllosphereThe plant immune system as a microbial management systemDo pattern recognition receptors (PRRs) direct microbiota assembly?Do intra-cellular NLR proteins contribute to assembly of microbial consortia?Interactions of plant pathogens and the plant microbiota: Systemic effects in susceptible and resistant plantsMicrobial effectors mediate plant-microbe interactionsPerspectiveAcknowledgmentsReferencesCellular dialogues between hosts and microbial symbionts: Generalities emerging
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