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Gut microbiota, gut microbiome, or gut flora are the microorganisms, including bacteria, archaea, fungi, and viruses, that live in the digestive tracts of animals. [1] [2] The gastrointestinal metagenome is the aggregate of all the genomes of the gut microbiota. [3] [4] The gut is the main location of the human microbiome. [5]
Infants and children under three years old show low diversity in microbiome bacteria, but more diversity between individuals when compared to adults. [17] Reduction of Bifidobacterium and increase in diversity of the infant gut microbiome occurs with less breast-milk intake and increase of solid food intake.
The microbiome and host emerged during evolution as a synergistic unit from epigenetics and genetic characteristics, sometimes collectively referred to as a holobiont. [7] [8] The presence of microbiota in human and other metazoan guts has been critical for understanding the co-evolution between metazoans and bacteria.
Graphic depicting the human skin microbiota, with relative prevalences of various classes of bacteria. The human microbiome is the aggregate of all microbiota that reside on or within human tissues and biofluids along with the corresponding anatomical sites in which they reside, [1] [2] including the gastrointestinal tract, skin, mammary glands, seminal fluid, uterus, ovarian follicles, lung ...
Co-occurrence networks show difference in gut microbiota between herbivorous and carnivorous cichlids Nodes coloured according to phylum. The herbivore network has higher complexity (156 nodes and 339 edges) compared to the carnivore network (21 nodes and 70 edges).
The gut microbiota can vary between research facilities which can be a confounder in experiments and be a cause of lack of reproducibility. [24] Several control microbiomes have been developed which correct the major health defects commonly present in germ free animals and can act as a reproducible control community.
An enterotype is a classification of living organisms based on the bacteriological composition of their gut microbiota. The discovery of three human enterotypes was announced in the April 2011 issue of Nature by Peer Bork and his associates. [1] They found that enterotypes are not dictated by age, gender, body weight, or national divisions. [2]
The initial acquisition of microbiota is the formation of an organism's microbiota immediately before and after birth. The microbiota (also called flora) are all the microorganisms including bacteria, archaea and fungi that colonize the organism. The microbiome is another term for microbiota or can refer to the collected genomes.