000K utf8 1100 $c2019 1500 eng 2050 urn:nbn:de:gbv:8-mods-2019-00126-9 2051 10.3389/fmicb.2019.01793 3000 Yang, Wentao 3010 Dierking, Katja 3010 Dirksen, Philipp 3010 Graf von der Schulenburg, Hinrich 3010 Kaleta, Christoph 3010 Leippe, Matthias 3010 Pees, Barbara 3010 Petersen, Carola 3010 Rosenstiel, Philip 3010 Tholey, Andreas 3010 Waschina, Silvio 3010 Zimmermann, Johannes 4000 The Inducible Response of the Nematode Caenorhabditis elegans to Members of Its Natural Microbiota Across Development and Adult Life [Yang, Wentao] 4209 The biology of all organisms is influenced by the associated community of microorganisms. In spite of its importance, it is usually not well understood how exactly this microbiota affects host functions and what are the underlying molecular processes. To rectify this knowledge gap, we took advantage of the nematode Caenorhabditis elegans as a tractable, experimental model system and assessed the inducible transcriptome response after colonization with members of its native microbiota. For this study, we focused on two isolates of the genus Ochrobactrum. These bacteria are known to be abundant in the nematode's microbiota and are capable of colonizing and persisting in the nematode gut, even under stressful conditions. The transcriptome response was assessed across development and three time points of adult life, using general and C. elegans-specific enrichment analyses to identify affected functions. Our assessment revealed an influence of the microbiota members on the nematode's dietary response, development, fertility, immunity, and energy metabolism. This response is mainly regulated by a GATA transcription factor, most likely ELT-2, as indicated by the enrichment of (i) the GATA motif in the promoter regions of inducible genes and (ii) of ELT-2 targets among the differentially expressed genes. We compared our transcriptome results with a corresponding previously characterized proteome data set, highlighting a significant overlap in the differentially expressed genes, the affected functions, and ELT-2 target genes. Our analysis further identified a core set of 86 genes that consistently responded to the microbiota members across development and adult life, including several C-type lectin-like genes and genes known to be involved in energy metabolism or fertility. We additionally assessed the consequences of induced gene expression with the help of metabolic network model analysis, using a previously established metabolic network for C. elegans. This analysis complemented the enrichment analyses by revealing an influence of the Ochrobactrum isolates on C. elegans energy metabolism and furthermore metabolism of specific amino acids, fatty acids, and also folate biosynthesis. Our findings highlight the multifaceted impact of naturally colonizing microbiota isolates on C. elegans life history and thereby provide a framework for further analysis of microbiota-mediated host functions. 4950 https://doi.org/10.3389/fmicb.2019.01793$xR$3Volltext$534 4950 https://nbn-resolving.org/urn:nbn:de:gbv:8-mods-2019-00126-9$xR$3Volltext$534 4961 https://macau.uni-kiel.de/receive/macau_mods_00000079 5051 610 5550 Caenorhabditis elegans 5550 Metabolic Network Model 5550 Microbiota 5550 Ochrobactrum 5550 Rna-seq 5550 Transcriptomics