title: Phylotype-level 16S rRNA analysis reveals new bacterial indicators of health state in acute murine colitis.
abstract: Human inflammatory bowel disease and experimental colitis models in mice are associated with shifts in intestinal microbiota composition, but it is unclear at what taxonomic/phylogenetic level such microbiota dynamics can be indicative for health or disease. Here, we report that dextran sodium sulfate (DSS)-induced colitis is accompanied by major shifts in the composition and function of the intestinal microbiota of STAT1(-/-) and wild-type mice, as determined by 454 pyrosequencing of bacterial 16S rRNA (gene) amplicons, metatranscriptomics and quantitative fluorescence in situ hybridization of selected phylotypes. The bacterial families Ruminococcaceae, Bacteroidaceae, Enterobacteriaceae, Deferribacteraceae and Verrucomicrobiaceae increased in relative abundance in DSS-treated mice. Comparative 16S rRNA sequence analysis at maximum possible phylogenetic resolution identified several indicator phylotypes for DSS treatment, including the putative mucin degraders Akkermansia and Mucispirillum. The analysis additionally revealed strongly contrasting abundance changes among phylotypes of the same family, particularly within the Lachnospiraceae. These extensive phylotype-level dynamics were hidden when reads were grouped at higher taxonomic levels. Metatranscriptomic analysis provided insights into functional shifts in the murine intestinal microbiota, with increased transcription of genes associated with regulation and cell signaling, carbohydrate metabolism and respiration and decreased transcription of flagellin genes during inflammation. These findings (i) establish the first in-depth inventory of the mouse gut microbiota and its metatranscriptome in the DSS colitis model, (ii) reveal that family-level microbial community analyses are insufficient to reveal important colitis-associated microbiota shifts and (iii) support a scenario of shifting intra-family structure and function in the phylotype-rich and phylogenetically diverse Lachnospiraceae in DSS-treated mice.
authors.affiliation: Department of Microbial Ecology, Vienna Ecology Center, Faculty of Life Sciences, University of Vienna, Wien, Austria.
authors.forename: David
authors.initials: D
authors.lastname: Berry
authors.forename: Clarissa
authors.initials: C
authors.lastname: Schwab
authors.forename: Gabriel
authors.initials: G
authors.lastname: Milinovich
authors.forename: Jochen
authors.initials: J
authors.lastname: Reichert
authors.forename: Karim
authors.initials: K
authors.lastname: Ben Mahfoudh
authors.forename: Thomas
authors.initials: T
authors.lastname: Decker
authors.forename: Marion
authors.initials: M
authors.lastname: Engel
authors.forename: Brigitte
authors.initials: B
authors.lastname: Hai
authors.forename: Eva
authors.initials: E
authors.lastname: Hainzl
authors.forename: Susanne
authors.initials: S
authors.lastname: Heider
authors.forename: Lukas
authors.initials: L
authors.lastname: Kenner
authors.forename: Mathias
authors.initials: M
authors.lastname: Müller
authors.forename: Isabella
authors.initials: I
authors.lastname: Rauch
authors.forename: Birgit
authors.initials: B
authors.lastname: Strobl
authors.forename: Michael
authors.initials: M
authors.lastname: Wagner
authors.forename: Christa
authors.initials: C
authors.lastname: Schleper
authors.forename: Tim
authors.initials: T
authors.lastname: Urich
authors.forename: Alexander
authors.initials: A
authors.lastname: Loy
mesh_terms: D000818:Animals; D001419:Bacteria / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification*; D003092:Colitis / Q000139:chemically induced / Q000378:metabolism / Q000382:microbiology*; D016264:Dextran Sulfate; D004195:Disease Models, Animal; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D015212:Inflammatory Bowel Diseases / Q000150:complications / Q000235:genetics / Q000382:microbiology*; D007413:Intestinal Mucosa / Q000378:metabolism; D007422:Intestines / Q000382:microbiology; D054892:Metagenome; D051379:Mice; D010802:Phylogeny; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics
chemical_list: D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; D016264:Dextran Sulfate