Verminephrobacter

Verminephrobacter
Scientific classification
Domain: Bacteria
Phylum: Proteobacteria
Class: Betaproteobacteria
Order: Burkholderiales
Family: Comamonadaceae
Genus: Verminephrobacter
Species

V. eiseniae

Verminephrobacter is a genus of Gram negative bacteria that colonize the nephridia of earthworms within the family Lumbricidae. The first species in the genus, V. eiseniae, was isolated from the earthworm Eisenia foetida, and its description published in 2008.[1] Their closest free-living relatives are bacteria of the genus Acidovorax.

Reports of bacteria inhabiting the nephridia of earthworms first appeared in 1926.[2] Their approximate identity was determined in 2003.[3] While the function of the bacteria inside the nephridia remains unknown, several lines of evidence suggest this association as a stable symbiosis. Chiefly among them is the vertical transmission of the bacteria, meaning that the bacteria are deposited by the parent earthworm inside the egg-capsule, and colonize the developing embryo via specialized anatomical features.[4] Colonization of the nephridia cannot occur after the eggs hatch.[5] DNA belonging to members of the genus has not been recovered from surveys of soil samples even in the presence of high densities of earthworms, suggesting that Verminephrobacter species are confined to their earthworm hosts. Observations for comparative analyses of the genome sequence of V. eiseniae suggest that this organisms shares features associated with the transition from a free-living to a host-associated lifestyle.[6]

References

  1. ↑ Pinel N, Davidson SK, Stahl DA (2008). "Verminephrobacter eiseniae gen. nov., sp. nov., a nephridial symbiont of the earthworm Eisenia foetida (Savigny)". Int. J. Syst. Evol. Microbiol. 58 (9): 2147–57. doi:10.1099/ijs.0.65174-0. PMID 18768621.
  2. ↑ Knop, J. (1926). "Bakterien und Bakteroiden bei Oligochäten". Z. Morph. Ökol. Tiere. 6 (3): 588–624. doi:10.1007/BF00464431.
  3. ↑ Schramm A, Davidson SK, Dodsworth JA, Drake HL, Stahl DA, Dubilier N (2003). "Acidovorax-like symbionts in the nephridia of earthworms". Environ. Microbiol. 5 (9): 804–9. doi:10.1046/j.1462-2920.2003.00474.x. PMID 12919416.
  4. ↑ Davidson SK, Stahl DA (2008). "Selective recruitment of bacteria during embryogenesis of an earthworm". Isme J. 2 (5): 510–8. doi:10.1038/ismej.2008.16. PMID 18273064.
  5. ↑ Davidson SK, Stahl DA (2006). "Transmission of Nephridial Bacteria of the Earthworm Eisenia fetida". Appl. Environ. Microbiol. 72 (1): 769–75. doi:10.1128/AEM.72.1.769-775.2006. PMC 1352274Freely accessible. PMID 16391117.
  6. ↑ "Genome Sequences of Verminephrobacter eiseniae and two closely related bacteria".
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