Synonyms
Definition
Methanogenic archaea are obligate anaerobic archaea that produce methane as a metabolic by-product in anoxic conditions. Methanogens are usually coccoid (spherical) or bacilli (rod shaped). There are over 50 described species of methanogens, and they do not form a monophyletic group. There are three main metabolisms of methanogenesis: (1) acetate reduction, (2) methanol or methylamine reduction, and (3) H2 oxidation and CO2 reduction. In the human gut, methanogenic archaea rely on methanol and H2/CO2 metabolisms.
Introduction
The human digestive tract contains variable amounts of gases, of which only H2 and CH4 are produced by microorganisms. Methane is mainly produced in the colon and is evacuated in flatus and breath through blood circulation. However, CH4 production varies significantly between individuals as not everyone will have detectable CH4 (>1 ppm) in their breath. Methane production is dependent on fermentative production of H2, which...
This is a preview of subscription content, log in via an institution.
References
Borrel G, Harris HMB, Tottey W, et al. Genome sequence of “Candidatus Methanomethylophilus alvus” Mx1201, a methanogenic archaeon from the human gut belonging to a seventh order of methanogens. J Bacteriol. 2012;194:6944–5.
Carbonero F, Benefiel AC, Gaskins HR. Contributions of the microbial hydrogen economy to colonic homeostasis. Nat Rev Gastroenterol Hepatol. 2012;9:504–18.
Hansen EE, et al. Pan-genome of the dominant human gut-associated archaeon, Methanobrevibacter smithii, studied in twins. Proc Natl Acad Sci U S A. 2011;108:4599–606.
Levitt MD, Furne JK, Kuskowski M, Ruddy J. Stability of human methanogenic flora over 35 years and a review of insights obtained from breath methane measurements. Clin Gastroenterol Hepatol. 2006;4:123–9.
Miller TL, Wolin MJ. Methanosphaera stadtmaniae gen. nov., sp. nov.: a species that forms methane by reducing methanol with hydrogen. Arch Microbiol. 1985;141:116–22.
Nava GM, Carbonero F, Croix JA, Greenberg E, Gaskins HR. Abundance and diversity of mucosa-associated hydrogenotrophic microbes in the healthy human colon. ISME J. 2012;6:57–70.
Miller TL, Wolin MJ. Methanogens in human and animal intestinal tracts. Syst Appl Microbiol. 1986;7:223–9.
Miller TL, Wolin MJ, de Macario EC, Macario AJ. Isolation of Methanobrevibacter smithii from human feces. Appl Environ Microbiol. 1982;43:227–32.
Scanlan PD, Shanahan F, Marchesi JR. Human methanogen diversity and incidence in healthy and diseased colonic groups using mcrA gene analysis. BMC Microbiol. 2008;8:79.
Zhang HS, DiBaise JK, Zuccolo A, et al. Human gut microbiota in obesity and after gastric bypass. Proc Natl Acad Sci U S A. 2009;106:2365–70.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2013 Springer Science+Business Media New York
About this entry
Cite this entry
Carbonero, F., Gaskins, H.R. (2013). Methanogenic Archaea in the Human Microbiome. In: Nelson, K. (eds) Encyclopedia of Metagenomics. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-6418-1_755-2
Download citation
DOI: https://doi.org/10.1007/978-1-4614-6418-1_755-2
Received:
Accepted:
Published:
Publisher Name: Springer, New York, NY
Online ISBN: 978-1-4614-6418-1
eBook Packages: Springer Reference Biomedicine and Life SciencesReference Module Biomedical and Life Sciences