Symbiosis research has become a holistic and pervasive field with a mature theoretical basis. Extraordinary diversity in symbiotic relationships exists across the tree of life. The aim of this collection is to showcase the diversity of these relationships, exploring their evolutionary basis and underlying mechanisms. This image shows the ciliate Paramecium bursaria, a key model system for studying symbiosis. P. bursaria is a single-celled protist of about 0.1 mm in length which harbors over 100 green algae. The purple is the autofluorescence of the chlorophyll in the algal cells, while the light blue stain highlights the two Paramecium host nuclei. The yellow flecks indicate the Paramecium lysosomes; vesicle compartments filled with digestive enzymes which the host will use to punish and destroy algal endosymbionts that misbehave.
Image Credit: Estelle Kilias
Editorial
Symbiosis: In search of a deeper understanding
PLOS Biology: published April 12, 2024 | https://doi.org/10.1371/journal.pbio.3002595
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Essays
Modeling endosymbioses: Insights and hypotheses from theoretical approaches
PLOS Biology: published April 10, 2024 | https://doi.org/10.1371/journal.pbio.3002583
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Fitness trade-offs and the origins of endosymbiosis
PLOS Biology: published April 12, 2024 | https://doi.org/10.1371/journal.pbio.3002580
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Unsolved Mystery
How do bacterial endosymbionts work with so few genes?
PLOS Biology: published April 16, 2024 | https://doi.org/10.1371/journal.pbio.3002577
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Perspectives
Symbiosis takes a front and center role in biology
PLOS Biology: published April 5, 2024 | https://doi.org/10.1371/journal.pbio.3002571
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Symbiotic revolutions at the interface of genomics and microbiology
PLOS Biology: published April 9, 2024 | https://doi.org/10.1371/journal.pbio.3002581
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Mutualism on the edge: Understanding the Paramecium–Chlorella symbiosis
PLOS Biology: published April 4, 2024 | https://doi.org/10.1371/journal.pbio.3002563
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What choanoflagellates can teach us about symbiosis
PLOS Biology: published April 3, 2024 | https://doi.org/10.1371/journal.pbio.3002561
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Linking cell biology and ecology to understand coral symbiosis evolution
PLOS Biology: published April 11, 2024 | https://doi.org/10.1371/journal.pbio.3002593
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Fungal holobionts as blueprints for synthetic endosymbiotic systems
PLOS Biology: published April 12, 2024 | https://doi.org/10.1371/journal.pbio.3002587
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Primers
Genome-wide association studies have problems due to confounding: Are family-based designs the answer?
PLOS Biology: published April 12, 2024 | https://doi.org/10.1371/journal.pbio.3002568
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Identifying causes and consequences of rhizosphere microbiome heritability
PLOS Biology: published April 26, 2024 | https://doi.org/10.1371/journal.pbio.3002604
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Multiple checkpoints ensure ribosomes have the correct end
PLOS Biology: published April 30, 2024 | https://doi.org/10.1371/journal.pbio.3002603
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Research Articles
Chaperone Hsp70 helps Salmonella survive infection-relevant stress by reducing protein synthesis
PLOS Biology: published April 4, 2024 | https://doi.org/10.1371/journal.pbio.3002560
Interpreting population- and family-based genome-wide association studies in the presence of confounding
PLOS Biology: published April 11, 2024 | https://doi.org/10.1371/journal.pbio.3002511
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Ecological drift during colonization drives within-host and between-host heterogeneity in an animal-associated symbiont
PLOS Biology: published April 25, 2024 | https://doi.org/10.1371/journal.pbio.3002304
The genotype of barley cultivars influences multiple aspects of their associated microbiota via differential root exudate secretion
PLOS Biology: published April 25, 2024 | https://doi.org/10.1371/journal.pbio.3002232
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The impact of phage and phage resistance on microbial community dynamics
PLOS Biology: published April 22, 2024 | https://doi.org/10.1371/journal.pbio.3002346
Single-cell RNA-seq of Drosophila miranda testis reveals the evolution and trajectory of germline sex chromosome regulation
PLOS Biology: published April 30, 2024 | https://doi.org/10.1371/journal.pbio.3002605
Neural populations within macaque early vestibular pathways are adapted to encode natural self-motion
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Brain high-throughput multi-omics data reveal molecular heterogeneity in Alzheimer’s disease
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Mrj is a chaperone of the Hsp40 family that regulates Orb2 oligomerization and long-term memory in Drosophila
PLOS Biology: published April 22, 2024 | https://doi.org/10.1371/journal.pbio.3002585
Molecular circadian rhythms are robust in marine annelids lacking rhythmic behavior
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The development of brain pericytes requires expression of the transcription factor nkx3.1 in intermediate precursors
PLOS Biology: published April 29, 2024 | https://doi.org/10.1371/journal.pbio.3002590
Polarised cell intercalation during Drosophila axis extension is robust to an orthogonal pull by the invaginating mesoderm
PLOS Biology: published April 29, 2024 | https://doi.org/10.1371/journal.pbio.3002611
Bruno 1/CELF regulates splicing and cytoskeleton dynamics to ensure correct sarcomere assembly Drosophila flight muscles
PLOS Biology: published April 29, 2024 | https://doi.org/10.1371/journal.pbio.3002575
Umbravirus-like RNA viruses are capable of independent systemic plant infection in the absence of encoded movement proteins
PLOS Biology: published April 25, 2024 | https://doi.org/10.1371/journal.pbio.3002600
Lytic bacteriophages induce the secretion of antiviral and proinflammatory cytokines from human respiratory epithelial cells
PLOS Biology: published April 23, 2024 | https://doi.org/10.1371/journal.pbio.3002566
A host-directed oxadiazole compound potentiates antituberculosis treatment via zinc poisoning in human macrophages and in a mouse model of infection
PLOS Biology: published April 29, 2024 | https://doi.org/10.1371/journal.pbio.3002259
Optogenetic manipulation of lysosomal physiology and autophagy-dependent clearance of amyloid beta
PLOS Biology: published April 23, 2024 | https://doi.org/10.1371/journal.pbio.3002591
CFDP1 regulates the stability of pericentric heterochromatin thereby affecting RAN GTPase activity and mitotic spindle formation
PLOS Biology: published April 17, 2024 | https://doi.org/10.1371/journal.pbio.3002574
Mitofusin-mediated contacts between mitochondria and peroxisomes regulate mitochondrial fusion
PLOS Biology: published April 26, 2024 | https://doi.org/10.1371/journal.pbio.3002602
The human AAA-ATPase VPS4A isoform and its co-factor VTA1 have a unique function in regulating mammalian cytokinesis abscission
PLOS Biology: published April 30, 2024 | https://doi.org/10.1371/journal.pbio.3002327
Bacillus subtilis uses the SigM signaling pathway to prioritize the use of its lipid carrier for cell wall synthesis
PLOS Biology: published April 29, 2024 | https://doi.org/10.1371/journal.pbio.3002589
Short Reports
Removal of older males increases extra-pair siring success of yearling males
PLOS Biology: published April 16, 2024 | https://doi.org/10.1371/journal.pbio.3002584
Visual perception of highly memorable images is mediated by a distributed network of ventral visual regions that enable a late memorability response
PLOS Biology: published April 1, 2024 | https://doi.org/10.1371/journal.pbio.3002564
Neuronal cell cycle reentry events in the aging brain are more prevalent in neurodegeneration and lead to cellular senescence
PLOS Biology: published April 23, 2024 | https://doi.org/10.1371/journal.pbio.3002559
Developmental fine-tuning of medial superior olive neurons mitigates their predisposition to contralateral sound sources
PLOS Biology: published April 29, 2024 | https://doi.org/10.1371/journal.pbio.3002586
Direct Salmonella injection into enteroid cells allows the study of host–pathogen interactions in the cytosol with high spatiotemporal resolution
PLOS Biology: published April 29, 2024 | https://doi.org/10.1371/journal.pbio.3002597
YeeD is an essential partner for YeeE-mediated thiosulfate uptake in bacteria and regulates thiosulfate ion decomposition
PLOS Biology: published April 24, 2024 | https://doi.org/10.1371/journal.pbio.3002601
Methods and Resources
Blik is an extensible 3D visualisation tool for the annotation and analysis of cryo-electron tomography data
PLOS Biology: published April 30, 2024 | https://doi.org/10.1371/journal.pbio.3002447
Meta-Research Article
Shortcut citations in the methods section: Frequency, problems, and strategies for responsible reuse
PLOS Biology: published April 2, 2024 | https://doi.org/10.1371/journal.pbio.3002562
Update Article
The kinase Rio1 and a ribosome collision-dependent decay pathway survey the integrity of 18S rRNA cleavage
PLOS Biology: published April 25, 2024 | https://doi.org/10.1371/journal.pbio.3001767
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Formal Comments
Realism and robustness require increased sample size when studying both sexes
PLOS Biology: published April 11, 2024 | https://doi.org/10.1371/journal.pbio.3002456
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A response to “Realism and robustness require increased sample size when studying both sexes”
PLOS Biology: published April 12, 2024 | https://doi.org/10.1371/journal.pbio.3002578