Bacterial Influences on Animal Origins

Alegado, Rosanna A.; King, Nicole

doi:10.1101/cshperspect.a016162

Cited by 57 publications

(59 citation statements)

References 177 publications

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“…In one of the most dramatic examples of cross-talk between bacteria and an animal, Vibrio fischeri bacteria are recruited into crypts in the juvenile Hawaiian bobtail squid, where the bacteria then trigger postembryonic morphogenesis of the "light organ" (20). The widespread phylogenetic distribution of bacterially regulated developmental processes in animals suggests that such interactions may have been pivotal during the origin and early evolution of animals (19,52).…”

Section: Discussionmentioning

confidence: 99%

Bacterial lipids activate, synergize, and inhibit a developmental switch in choanoflagellates

Woznica

Cantley

Beemelmanns

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

122

133

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In choanoflagellates, the closest living relatives of animals, multicellular rosette development is regulated by environmental bacteria. The simplicity of this evolutionarily relevant interaction provides an opportunity to identify the molecules and regulatory logic underpinning bacterial regulation of development. We find that the rosette-inducing bacterium Algoriphagus machipongonensis produces three structurally divergent classes of bioactive lipids that, together, activate, enhance, and inhibit rosette development in the choanoflagellate Salpingoeca rosetta. One class of molecules, the lysophosphatidylethanolamines (LPEs), elicits no response on its own but synergizes with activating sulfonolipid rosette-inducing factors (RIFs) to recapitulate the full bioactivity of live Algoriphagus. LPEs, although ubiquitous in bacteria and eukaryotes, have not previously been implicated in the regulation of a host-microbe interaction. This study reveals that multiple bacterially produced lipids converge to activate, enhance, and inhibit multicellular development in a choanoflagellate.choanoflagellates | bacteria | host-microbe | sulfonolipid | multicellularity

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Section: Discussionmentioning

confidence: 99%

Bacterial lipids activate, synergize, and inhibit a developmental switch in choanoflagellates

Woznica

Cantley

Beemelmanns

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

122

133

View full text Add to dashboard Cite

show abstract

“…First, it is clear that understanding the transition to multicellularity requires a detailed understanding of the life cycle, cell biology, and ecology of simpler ancestor(s) that gave rise to multicellular descendant lineages. Indeed, research into the origins of animal multicellularity have been transformed by investigating their closest unicellular ancestors including choanoflagellates and others (King et al 2008;Fairclough et al 2013;SebePedros et al 2013;Alegado and King 2014). Gene family expansion and novel protein domain organization are observed in metazoans and embryophytes and associated with some key innovations Degnan et al 2009;Srivastava et al 2010).…”

Section: Discussionmentioning

confidence: 99%

“…The closest unicellular ancestors to animals, the choanoflagellates, show a limited degree of colonial or multicellular organization outside of their one big hit in the metazoan lineage (Dayel et al 2011;Alegado and King 2014). The streptophytes (charophyte algae þ embryophytes [land plants]) and their sister group, the chlorophytes (green algae), have repeatedly generated multicellular taxa as well as macroscopic unicellular forms that show many of the traits that are typically considered hallmarks of multicellularity ( Fig.…”

Section: Unique Aspects Of Multicellularity In Plants and Green Algaementioning

confidence: 99%

Green Algae and the Origins of Multicellularity in the Plant Kingdom

Umen

2014

Cold Spring Harbor Perspectives in Biology

115

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The green lineage of chlorophyte algae and streptophytes form a large and diverse clade with multiple independent transitions to produce multicellular and/or macroscopically complex organization. In this review, I focus on two of the best-studied multicellular groups of green algae: charophytes and volvocines. Charophyte algae are the closest relatives of land plants and encompass the transition from unicellularity to simple multicellularity. Many of the innovations present in land plants have their roots in the cell and developmental biology of charophyte algae. Volvocine algae evolved an independent route to multicellularity that is captured by a graded series of increasing cell-type specialization and developmental complexity. The study of volvocine algae has provided unprecedented insights into the innovations required to achieve multicellularity.

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“…Though again, this scenario predicts that multiple heterotrophic lineages would have evolved animal-like multicellularity in response to widespread eukaryotic predation in the Neoproterozoic Era -that is, a polyphyletic origin of animal multicellularity (Figure 2A,B,C). Animal monophyly and observations showing that coloniality in choanoflagellates is instigated by prey bacteria in the complete absence of flagellate-eating predators [48] suggest that alternative or additional factors, such as enhanced prey capture [49,50], might have encouraged the evolution of animal multicellularity [18].…”

Section: Animal Origins In Context: the Tonian Earth Systemmentioning

confidence: 99%

Animal origins and the Tonian Earth system

Mills

Francis

Canfield

2018

Emerging Topics in Life Sciences

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The Neoproterozoic Era (1000-541 million years ago, Ma) was characterized by dramatic environmental and evolutionary change, including at least two episodes of extensive, low-latitude glaciation, potential changes in the redox structure of the global ocean, and the origin and diversification of animal life. How these different events related to one another remains an active area of research, particularly how these environmental changes influenced, and were influenced by, the earliest evolution of animals. Animal multicellularity is estimated to have evolved in the Tonian Period (1000-720 Ma) and represents one of at least six independent acquisitions of complex multicellularity, characterized by cellular differentiation, three-dimensional body plans, and active nutrient transport. Compared with the other instances of complex multicellularity, animals represent the only clade to have evolved from wall-less, phagotrophic flagellates, which likely placed unique cytological and trophic constraints on the evolution of animal multicellularity. Here, we compare recent molecular clock estimates with compilations of the chromium isotope, micropaleontological, and organic biomarker records, suggesting that, as of now, the origin of animals was not obviously correlated to any environmental-ecological change in the Tonian Period. This lack of correlation is consistent with the idea that the evolution of animal multicellularity was primarily dictated by internal, developmental constraints and occurred independently of the known environmental-ecological changes that characterized the Neoproterozoic Era.

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Bacterial Influences on Animal Origins

Cited by 57 publications

References 177 publications

Bacterial lipids activate, synergize, and inhibit a developmental switch in choanoflagellates

Bacterial lipids activate, synergize, and inhibit a developmental switch in choanoflagellates

Green Algae and the Origins of Multicellularity in the Plant Kingdom

Animal origins and the Tonian Earth system

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