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The oral and gut microbiomes are perturbed in rheumatoid arthritis and partly normalized after treatment

Abstract

We carried out metagenomic shotgun sequencing and a metagenome-wide association study (MGWAS) of fecal, dental and salivary samples from a cohort of individuals with rheumatoid arthritis (RA) and healthy controls. Concordance was observed between the gut and oral microbiomes, suggesting overlap in the abundance and function of species at different body sites. Dysbiosis was detected in the gut and oral microbiomes of RA patients, but it was partially resolved after RA treatment. Alterations in the gut, dental or saliva microbiome distinguished individuals with RA from healthy controls, were correlated with clinical measures and could be used to stratify individuals on the basis of their response to therapy. In particular, Haemophilus spp. were depleted in individuals with RA at all three sites and negatively correlated with levels of serum autoantibodies, whereas Lactobacillus salivarius was over-represented in individuals with RA at all three sites and was present in increased amounts in cases of very active RA. Functionally, the redox environment, transport and metabolism of iron, sulfur, zinc and arginine were altered in the microbiota of individuals with RA. Molecular mimicry of human antigens related to RA was also detectable. Our results establish specific alterations in the gut and oral microbiomes in individuals with RA and suggest potential ways of using microbiome composition for prognosis and diagnosis.

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Figure 1: Microbial dysbiosis in the gut, dental plaques and saliva of individuals with RA.
Figure 2: Oral MLGs enriched in dental and salivary samples of RA subjects and controls.
Figure 3: Patient stratification on the basis of RA-associated bacteria.
Figure 4: Correlation between gut and oral MLGs.
Figure 5: Gut and oral MLGs can be used to distinguish RA patients from healthy controls.
Figure 6: The microbiome is altered after DMARD treatment.

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Acknowledgements

This research was supported by the Natural Science Foundation of China (grants 30890032 and 30725008 to Jun Wang and 81325019 to X.Z.), the Shenzhen Municipal Government of China (grant BGI20100001 to Jun Wang and grants JSGG20140702161403250 and DRC-SZ[2015]162 to Q.F.), the Danish Strategic Research Council (grant 2106-07-0021 to J.W.), an Ole Rømer grant from the Danish Natural Science Research Council and the Solexa project (272-07-0196 to J.W.), the Fund for Science and Technology Development (FDCT) from Macao (grant 077/2014/A2 to J.W.) and the Research Special Fund for Public Welfare Industry of Health (grant 2013202017 to X.Z.). The authors are very grateful to colleagues at BGI-Shenzhen for DNA extraction, library construction, sequencing and discussions.

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Contributions

X.Z., Yingrui Li and Jun Wang conceived and directed the project. X.Z., D.L., X. Wu, H.C., L.W., Q.-j.W., F.Z., W.Z. and Yongzhe Li made clinical diagnoses and performed treatment and sample collection. Z.L. and M.Z. managed the samples at BGI. D.Z., H.J., Q.F., D.W., Z.J., L.T., Yin Li, B.C., Z.L., Yanli Li, H.X., Junhua Li, Weineng Chen, S.T., Xiaoqiang Xu, X. Wang, X.C., S.L., Y.X., Jiyang Li and H.Z. performed bioinformatic analyses. X.Z., H.J. and L.L. wrote the manuscript. X.Q., G.L., W.X., L.X., Jun Li, Wanting Chen, Xun Xu, Y.Y., H.Y., Jian Wang, J.Y.A., K.K., T.L. and Q.H. contributed to data collection and text revision.

Corresponding authors

Correspondence to Xuan Zhang, Yingrui Li or Jun Wang.

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The authors declare no competing financial interests.

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Zhang, X., Zhang, D., Jia, H. et al. The oral and gut microbiomes are perturbed in rheumatoid arthritis and partly normalized after treatment. Nat Med 21, 895–905 (2015). https://doi.org/10.1038/nm.3914

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