The pig is a major species for livestock production and is also extensively used as the preferred model species for analyses of a wide range of human physiological functions and diseases1. The importance of the gut microbiota in complementing the physiology and genome of the host is now well recognized2. Knowledge of the functional interplay between the gut microbiota and host physiology in humans has been advanced by the human gut reference catalogue3,4. Thus, establishment of a comprehensive pig gut microbiome gene reference catalogue constitutes a logical continuation of the recently published pig genome5. By deep metagenome sequencing of faecal DNA from 287 pigs, we identified 7.7 million non-redundant genes representing 719 metagenomic species. Of the functional pathways found in the human catalogue, 96% are present in the pig catalogue, supporting the potential use of pigs for biomedical research. We show that sex, age and host genetics are likely to influence the pig gut microbiome. Analysis of the prevalence of antibiotic resistance genes demonstrated the effect of eliminating antibiotics from animal diets and thereby reducing the risk of spreading antibiotic resistance associated with farming systems.
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This work was supported financially by the INRA metaprogramme Meta-omics of Microbial Ecosystems (MEM), the Animal Genetics Division of INRA, the Biology Department of the University of Copenhagen and BGI-Shenzhen. Y.R.C. was funded by the European Union, in the framework of the Marie-Curie FP7 COFUND People Program, through the award of an AgreenSkills' fellowship (grant agreement no. 267196) linked to the METALIT project funded by the INRA MEM metaprogramme. This study was supported by the Shenzhen Municipal Government of China (grant nos. JCYJ20140418095735538, DRC-SZ162, CXB201108250098A and CXZZ20150330171521403), the National Transgenic Project of China (2014ZX0801007B), the Science and Technology Plan of Shenzhen City, the Shenzhen–Hong Kong Innovation Circle Research Fund, China (SGLH20120928140607107). The work was also supported by the Danish Innovation Fund (grant nos. 4105-00011A and 0603-00774B) and Metagenopolis grant ANR-11-DPBS-0001. The authors acknowledge technical support for faecal stool sampling provided by the INRA experimental units (Y. Billon, UE GENESI at le Magneraud; C. Jaeger and H. Demay, UMR SENAH at Saint Gilles; N. Müller, UE0787 at le Rheu; E. Venturi and his team, UE PAO at Nouzilly; J.-L. Gourdine and D. Renaudeau, URZ in the Guadeloupe; J.-J. Leplat, UMR GABI at Jouy-en-Josas). The authors thank K. Pedersen at Svindinge farm, T. Povlsen at Blæsenborg farm, V. Jensen and K. Jensen at Stærsminde farm and H. Loft Hansen for technical assistance in relation to collection of faecal samples from the Danish farms. The authors also thank X. Liu and Zhigang at the Institute of Allergy & Immunology, Shenzhen University, and L. Fang Liang, Q. Wei and Y. Li at the technical unit of the Chinese farms for help with faecal sampling and administration. The authors thank C. Denis (INRA, UMR GABI, Jouy-en-Josas) and F. Levenez (INRA, UMR MICALIS and MetaGenoPolis, Jouy-en-Josas) for faecal DNA preparation. The authors acknowledge the @BRIDGe platform (INRA, Jouy-en-Josas) for safe storage of samples. The authors are grateful to J. Nathaniel Paulson for kind assistance with the use of the R package referred to as metagenomeSeq, and J. Lunney (Animal Parasitic Diseases Laboratory, ARS, USDA, MD, Beltsville, USA) for discussions and the contribution to manuscript editing.
Background information on the 287 pig samples.
Description of the assembly data from the 287 samples.
Assembly results of the pig, human and mouse data.
Significantly differentially abundant genes in the gut microbiota composition between castrated males and females (Svindinge farm) at the genus and species bacteria levels.
Significantly differentially represented KEGG pathways in the gut microbiota between castrated males and females (Svindinge farm).
Significantly differentially abundant genes in the gut microbiota composition between males and females (Stæminde farm, wet feed) at the genus and species bacteria levels.
Significantly differentially abundant MGSs in the gut microbiota composition of males and females (Stæminde farm, wet feed).
Significantly differentially represented KEGG pathways in the gut microbiota between males and females (Stæminde farm, wet feed).
List of the KEGG pathways mapped by iPATH2 that were significantly differentially represented in the gut microbiota between males and females (11 males, 14 females, Stæminde farm, wet feed). The three most represented pathways are highlighted in grey. This list is derived from Supplementary Table 8 and correspond to the differentially abundant functions mapping against the KEGG, according to iPATH2 tools.