Fibrobacterota

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Fibrobacterota is a small bacterial phylum which includes many of the major rumen bacteria, allowing for the degradation of plant-based cellulose in ruminant animals. Members of this phylum were categorized in other phyla. The genus Fibrobacter was removed from the genus Bacteroides in 1988.[2]

Phylogeny and comparative genomic studies

Although Fibrobacterota is currently recognized as a distinct phylum, phylogenetic studies based RpoC and Gyrase B protein sequences, indicate that Fibrobacter succinogenes is closely related to the species from the phyla Bacteroidetes and Chlorobi.[3] The species from these three phyla also branch in the same position based upon conserved signature indels in a number of important proteins.[4] Lastly and most importantly, comparative genomic studies have identified two conserved signature indels (a 5-7 amino acid insert in the RpoC protein and a 13-16 amino acid insertion in serine hydroxymethyltransferase) and one signature protein (PG00081) that are uniquely shared by all of the species from these three phyla.[5] All of these results provide compelling evidence that the species from these three phyla shared a common ancestor exclusive of all other bacteria and it has been proposed that they should all recognized as part of a single “FCB”superphylum.[3][5]

Phylogeny

Phylogeny of Fibrobacterota.

16S rRNA based LTP_10_2024[6][7][8] 120 marker proteins based GTDB 09-RS220[9][10][11]

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Taxonomy

The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LSPN)[12] and National Center for Biotechnology Information (NCBI).[13]

File:Fibrobacteres.png
phylum Fibrobacterota and some of its phylogenetic neighbours
  • Class Chitinispirillia Sorokin et al. 2016
  • Class Chitinivibrionia Sorokin et al. 2014
  • Class Fibrobacteria Spain et al. 2012
    • Order Fibrobacterales Spain et al. 2012 ["Fibromonadales" Abdul Rahman et al. 2016]
      • Family Fibrobacteraceae Spain et al. 2012 [Fibromonadaceae" Abdul Rahman et al. 2016]
        • Genus Fibrobacter Montgomery et al. 1988
          • Species F. intestinalis Montgomery et al. 1988
          • Species F. succinogenes (Hungate 1950) Montgomery et al. 1988
            • Subspecies F. s. elongatus Montgomery et al. 1988
            • Subspecies F. s. succinogenes (Hungate 1950) Montgomery et al. 1988
        • Genus "Candidatus Fibromonas" Abdul Rahman et al. 2016
          • Species "Ca. F. termitidis" Abdul Rahman et al. 2016
        • Genus "Hallerella" Wylensek et al. 2020
          • Species "H. porci" Wylensek et al. 2021
          • Species "H. succinigenes" Wylensek et al. 2020

Distribution

The phylum Fibrobacterota is considered to be closely related to the CFB [Cytophaga-Flavibacterium-Bacteroidota].[5] It contains the genus Fibrobacter, which has strains present in the guts of many mammals including cattle and pigs.[14] The two described species in this genus namely, Fibrobacter succinogenes and Fibrobacter intestinalis are important members of fibrolytic communities in mammalian guts and have received a lot of attention in recent decades due to the long-standing interest microbes capable of degrading plant fiber.

Molecular evidence based on the amplification of 16rRNA genes from various environments suggest that the phylum is much more widespread than previously thought.[15][16] Most of the clones from mammalian environments group along with the known isolates in what has been called subphylum 1.[16] Members of subphylum 2 however, have so far been found only in the gut of termites.[16][17] and in some litter-feeding cockroaches.[18] The predominance of subphylum 2 in cellulolytic fibre-associated bacterial communities in hindguts of wood-feeding Nasutitermes corniger suggests that they play an important role in the breakdown of plant material in higher termites.[19]

See also

References

  1. ^ Page Module:Citation/CS1/styles.css has no content.Oren A, Garrity GM (2021). "Valid publication of the names of forty-two phyla of prokaryotes". Int J Syst Evol Microbiol. 71 (10): 5056. doi:10.1099/ijsem.0.005056. PMID 34694987. S2CID 239887308.
  2. ^ Page Module:Citation/CS1/styles.css has no content.Montgomery L, Flesher B, Stahl D (1988). "Transfer of Bacteroides succinogenes (Hungate) to Fibrobacter gen. nov. as Fibrobacter succinogenes comb. nov. and description of Fibrobacter intestinalis sp. nov". Int. J. Syst. Bacteriol. 38 (4): 430–435. doi:10.1099/00207713-38-4-430.
  3. ^ a b Page Module:Citation/CS1/styles.css has no content.Gupta, R. S. (2004). "The phylogeny and signature sequences characteristics of Fibrobacteres, Chlorobi, and Bacteroidetes". Critical Reviews in Microbiology. 30 (2): 123–140. doi:10.1080/10408410490435133. PMID 15239383. S2CID 24565648.
  4. ^ Page Module:Citation/CS1/styles.css has no content.Griffiths, E; Gupta, RS (2001). "The use of signature sequences in different proteins to determine the relative branching order of bacterial divisions: evidence that Fibrobacter diverged at a similar time to Chlamydia and the Cytophaga- Flavobacterium-Bacteroides division". Microbiology. 147 (9): 2611–22. doi:10.1099/00221287-147-9-2611. PMID 11535801.
  5. ^ a b c Page Module:Citation/CS1/styles.css has no content.Gupta, R. S.; Lorenzini, E. (2007). "Phylogeny and molecular signatures (conserved proteins and indels) that are specific for the Bacteroidetes and Chlorobi species". BMC Evolutionary Biology. 7: 71. doi:10.1186/1471-2148-7-71. PMC 1887533. PMID 17488508.
  6. ^ Page Module:Citation/CS1/styles.css has no content."The LTP". Retrieved 10 December 2024.
  7. ^ Page Module:Citation/CS1/styles.css has no content."LTP_all tree in newick format". Retrieved 10 December 2024.
  8. ^ Page Module:Citation/CS1/styles.css has no content."LTP_10_2024 Release Notes" (PDF). Retrieved 10 December 2024.
  9. ^ Page Module:Citation/CS1/styles.css has no content."GTDB release 09-RS220". Genome Taxonomy Database. Retrieved 10 May 2024.
  10. ^ Page Module:Citation/CS1/styles.css has no content."bac120_r220.sp_labels". Genome Taxonomy Database. Retrieved 10 May 2024.
  11. ^ Page Module:Citation/CS1/styles.css has no content."Taxon History". Genome Taxonomy Database. Retrieved 10 May 2024.
  12. ^ Template:Lpsn3
  13. ^ Page Module:Citation/CS1/styles.css has no content.Schoch CL; et al. "Fibrobacterota". National Center for Biotechnology Information (NCBI) taxonomy database. Retrieved 2025-06-05.
  14. ^ Page Module:Citation/CS1/styles.css has no content.Qi, M.; Nelson, K.E.; Daugherty, S.C.; Nelson, W.C.; Hance, I.R.; Morrison, M.; Forsberg, C.W. (2005). "Novel molecular features of the fibrolytic intestinal bacterium Fibrobacter intestinalis not shared with Fibrobacter succinogenes as determined by suppressive subtractive hybridization". Journal of Bacteriology. 187 (11): 3739–3751. doi:10.1128/jb.187.11.3739-3751.2005. PMC 1112041. PMID 15901698.
  15. ^ Page Module:Citation/CS1/styles.css has no content.McDonald, JE; Lockhart, RJ; Cox, MJ; Allison, HE; McCarthy, AJ (2008). "Detection of novel Fibrobacter populations in landfill sites and determination of their relative abundance via quantitative PCR". Environmental Microbiology. 10 (5): 1310–1319. doi:10.1111/j.1462-2920.2007.01544.x. PMID 18266756.
  16. ^ a b c Page Module:Citation/CS1/styles.css has no content.Hongoh, Y.; Deevong, P.; Hattori, S.; Inoue, T.; Noda, S.; Noparatnaraporn, N.; Kudo, T.; Ohkuma, M. (2006). "Phylogenetic diversity, localization, and cell morphologies of members of the candidate phylum TG3 and a subphylum in the phylum Fibrobacteres, recently discovered bacterial groups dominant in termite guts". Applied and Environmental Microbiology. 72 (10): 6780–6788. Bibcode:2006ApEnM..72.6780H. doi:10.1128/aem.00891-06. PMC 1610327. PMID 17021231.
  17. ^ Page Module:Citation/CS1/styles.css has no content.Mikaelyan, A.; Dietrich, C.; Köhler, T.; Poulsen, M.; Sillam-Dussès, D.; Brune, A. (2015). "Diet is the primary determinant of bacterial community structure in the guts of higher termites". Molecular Ecology. 24 (20): 5824–5895. doi:10.1111/mec.13376. PMID 26348261. S2CID 206182668.
  18. ^ Page Module:Citation/CS1/styles.css has no content.Mikaelyan, A.; Köhler, T.; Lampert, N.; Rohland, J.; Boga, H.; Meuser, K.; Brune, A. (2015). "Classifying the bacterial gut microbiota of termites and cockroaches: A curated phylogenetic reference database (DictDb)". Systematic and Applied Microbiology. 38 (7): 472–482. doi:10.1016/j.syapm.2015.07.004. PMID 26283320.
  19. ^ Page Module:Citation/CS1/styles.css has no content.Mikaelyan, A.; Strassert, J.; Tokuda, G.; Brune, A. (2014). "The fibre-associated cellulolytic bacterial community in the hindgut of wood-feeding higher termites (Nasutitermes spp.)". Environmental Microbiology. 16 (9): 2711–2722. doi:10.1111/1462-2920.12425.
  • List of Prokaryotic Names with Standing in Nomenclature - Genus Fibrobacter
  • Systema Naturae 2000 Classification: Phylum Fibrobacteres Script error: No such module "webarchive".

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