Evolution of host-beneficial traits in nitrogen-fixing bacteria: Modeling and construction of systems for interspecies altruism

Проворов, Н. А.; Vorobyev, Nikolay Ivanovich

doi:10.1134/s0003683815040146

Cited by 5 publications

(2 citation statements)

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“…), which emerged due to a broad distribution of symbiotically specialized (sym) genes in the plant-associated bacterial communities. In these rhizobia, increased N 2 -fixing activity is due to the elimination of negative symbiotic regulators, including the genes responsible for accumulation of storage compounds minimizing the energy costs of cellular metabolism, and for synthesis of exopolysaccharides eliciting the plant defense reactions (Provorov, et al 2014).…”

Section: Genetic Individuality In Symbiotic Microbesmentioning

confidence: 99%

“…This approach suggests that in the RLS system, altruism of microsymbionts towards their hosts may be controlled by kin selection, which operates in the plant-associated bacterial populations. Herein, the host represents a mediator in the transfer of altruism impacts from its donors (intracellular bacteroids which fix N 2 actively, but are not capable of reproduction) to recipients (extracellular non-N 2 -fixing bacteria that retain reproductive activity), while this mediating is compensated for host plants via fixed nitrogen provided by rhizobia (Provorov and Vorobyov, 2015). Another example of this host-directed altruism is represented by symbiotic cyanobacteria: up to 80 % of Nostoc punctiforme cells may be reorganized into non-reproducible N 2 -fixing heterocysts when forming intracellular symbiosis with Gunnera plants, while in free-living cyanobacteria heterocysts are formed by 10 % of cells (Meeks and Elhai, 2002).…”

Section: Symbio-geneticsmentioning

confidence: 99%

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Genetic individuality and interspecies altruism: modelling symbiogenesis using different types of symbiotic bacteria

Проворов

2021

BioComm

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In this minireview, we address the trade-off between biological altruism (group adaptation result-ing from the ability of an organism to improve the fitness of an associate at the expense of its own fitness) and symbiogenesis — the evolutionary pathway based on genetic integration of non-related species. We address symbiogenesis as a multi-stage process, which involves for-mation of superspecific hereditary systems — functionally integral symbiogenomes (under the facultative partners’ interactions) reorganized into the structurally integral hologenomes (in the obligatory symbioses). The best studied case of symbiogenesis is represented by the evolution of the eukaryotic cell based on transformation of symbiotic bacteria into cellular organelles. This evolution is associated with the deep reduction of microsymbionts’ genomes and with allocation of their genes into the hosts. As a result, microsymbionts lost their Genetic INdividuality (GIN), characterized by an ability to implement DNA- and RNA-based template syntheses required for genome maintenance and expression. Under facultative symbiotic dependence on hosts, the par-tial loss of GIN is due to a “symbiont → host” altruism which in the N2-fixing microbe–plant symbioses results in formation of non-reproducible bacterial forms (e.g., intracellular bacteroids in rhizobia or multiple heterocysts in Nostoc). If micro-symbionts lose their ability of autonomous existence (e.g., in the vertically transmitted intracellular symbionts), they are switched to the “forced altruism” in which the GIN reduction is required for the stable persistence of symbionts in hosts. Therefore, organellogenesis involves the sequential increase of the symbionts’ de-pendency on hosts: conditional → facultative → obligatory → absolute. It is associated with the reorganization of microbes into semi-autonomous cellular components, which may be completely devoid of their own genomes.

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Section: Genetic Individuality In Symbiotic Microbesmentioning

confidence: 99%

Section: Symbio-geneticsmentioning

confidence: 99%