The genus Sodalis as a resource for understanding the multifaceted evolution of bacterial symbiosis in insects

Renoz, François; Arai, Hiroshi; Pons, Inès

doi:10.1007/s13199-023-00966-0

Cited by 1 publication

(1 citation statement)

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“…On the other hand, among facultative symbiotic associations such as Wolbachia , Serratia , Sodalis, etc. with diverse insects (14–16), or even among evolutionarily conserved mutualistic associations such as Riptortus-Caballeronia symbioses (17, 18), the bacterial symbionts are occasionally or constantly moving around different host lineages, where they tend to remain less dependent on their hosts, often retain the capability of surviving outside their hosts, remain cultivable in some cases, keep large genome sizes, etc., which will end up with such evolutionary consequences as host-symbiont phylogenetic promiscuity and compromised/context-dependent host-symbiont interdependence and specificity (13, 19). Theoretical as well as empirical studies have shed light on what factors may affect the evolutionary trajectories toward diverse symbiotic associations ranging from loose/exchangeable ones to strict/specific ones (20, 21).…”

Section: Introductionmentioning

confidence: 99%

Host range of naturally and artificially evolved symbiotic bacteria for a specific host insect

Sugiyama,

Moriyama,

Koga

et al. 2024

Preprint

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Diverse insects are intimately associated with specific symbiotic bacteria, where host and symbiont are integrated into an almost inseparable biological entity. These symbiotic bacteria usually exhibit host specificity, uncultivability, reduced genome size, and other peculiar traits relevant to their symbiotic lifestyle. How host-symbiont specificity is established at the very beginning of symbiosis is of interest but poorly understood. To gain insight into the evolutionary issue, we adopted an experimental approach using the recently developed evolutionary model of symbiosis between the stinkbug Plautia stali and Escherichia coli. Based on the laboratory evolution of P. stali-E. coli mutualism, we selected ΔcyaA mutant of E. coli as an artificial symbiont of P. stali that has established mutualism by a single mutation. In addition, we selected a natural cultivable symbiont of P. stali of relatively recent evolutionary origin. These artificial and natural symbiotic bacteria of P. stali were experimentally inoculated to symbiont-deprived newborn nymphs of diverse stinkbug species. Strikingly, the mutualistic E. coli was unable to establish infection and support growth and survival of all the stinkbug species except for P. stali, uncovering that host specificity can be established at a very early stage of symbiotic evolution. Meanwhile, the natural symbiont was able to establish infection and support growth and survival of several stinkbug species in addition to P. stali, unveiling that a broader host range of the symbiont has evolved in nature. Based on these findings, we discuss what factors are relevant to the establishment of host specificity in the evolution of symbiosis.

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