Fibrobacterota Explained

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 (the only genus of Fibrobacterota) was removed from the genus Bacteroides in 1988.[1]

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.[2] The species from these three phyla also branch in the same position based upon conserved signature indels in a number of important proteins.[3] 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.[4] 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.[2]

Phylogeny

Phylogeny of Fibrobacterota.

Taxonomy

The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LSPN)[11] and the National Center for Biotechnology Information (NCBI).[12]

Distribution

The phylum Fibrobacterota is considered to be closely related to the CFB [Cytophaga-Flavibacterium-Bacteroidota].[4] It contains the genus Fibrobacter, which has strains present in the guts of many mammals including cattle and pigs.[13] 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.[14] [15] Most of the clones from mammalian environments group along with the known isolates in what has been called subphylum 1. Members of subphylum 2 however, have so far been found only in the gut of termites.[16] and in some litter-feeding cockroaches.[17] 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.[18]

See also

References

  1. Montgomery L, Flesher B, Stahl D . 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. . 1988 . 38 . 4. 430 - 435 . 10.1099/00207713-38-4-430 . free .
  2. Gupta . R. S. . 2004 . The phylogeny and signature sequences characteristics of Fibrobacteres, Chlorobi, and Bacteroidetes . Critical Reviews in Microbiology . 30 . 2. 123–140 . 10.1080/10408410490435133 . 15239383. 24565648 .
  3. 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 . 10.1099/00221287-147-9-2611 . 11535801. free .
  4. 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 . 10.1186/1471-2148-7-71 . 17488508 . 1887533 . free .
  5. Web site: The LTP . 23 February 2021.
  6. Web site: LTP_all tree in newick format. 23 February 2021.
  7. Web site: LTP_12_2021 Release Notes. 23 February 2021.
  8. Web site: GTDB release 08-RS214 . Genome Taxonomy Database. 10 May 2023.
  9. Web site: bac120_r214.sp_label . Genome Taxonomy Database. 10 May 2023.
  10. Web site: Taxon History . Genome Taxonomy Database. 10 May 2023.
  11. Web site: Euzéby JP . Fibrobacteres . List of Prokaryotic names with Standing in Nomenclature (LPSN). 2021-03-20.
  12. Web site: Sayers. Fibrobacteres . National Center for Biotechnology Information (NCBI) taxonomy database . 2021-03-20.
  13. Novel molecular features of the fibrolytic intestinal bacterium Fibrobacter intestinalis not shared with Fibrobacter succinogenes as determined by suppressive subtractive hybridization . Qi, M. . Nelson, K.E. . Daugherty, S.C. . Nelson, W.C. . Hance, I.R. . Morrison, M. . Forsberg, C.W. . Journal of Bacteriology . 187 . 11 . 3739–3751 . 2005 . 10.1128/jb.187.11.3739-3751.2005 . 15901698 . 1112041.
  14. Detection of novel Fibrobacter populations in landfill sites and determination of their relative abundance via quantitative PCR . Environmental Microbiology . 10 . 5 . 1310–1319 . 2008 . 10.1111/j.1462-2920.2007.01544.x . 18266756 . McDonald . JE . Lockhart . RJ . Cox . MJ . Allison . HE . McCarthy . AJ.
  15. 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 . Hongoh, Y. . Deevong, P. . Hattori, S. . Inoue, T. . Noda, S. . Noparatnaraporn, N. . Kudo, T. . Ohkuma, M. . Applied and Environmental Microbiology . 72 . 10 . 6780–6788 . 2006 . 10.1128/aem.00891-06 . 17021231 . 1610327. 2006ApEnM..72.6780H.
  16. 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 . 10.1111/mec.13376 . 26348261. 206182668 .
  17. 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 . 10.1016/j.syapm.2015.07.004 . 26283320.
  18. 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 . 10.1111/1462-2920.12425 .

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