Abstract
An improved understanding of the lung microbiome may lead to better strategies to diagnose, treat, and prevent pulmonary tuberculosis (PTB). However, the characteristics of the lung microbiomes of patients with TB remain largely undefined. In this study, 163 bronchoalveolar lavage (BAL) samples were collected from 163 sputum-negative suspected PTB patients. Furthermore, 12 paired BAL samples were obtained from 12 Mycobacterium tuberculosis-positive (MTB+) patients before and after negative conversion following a two-month anti-TB treatment. The V3–V4 region of the 16S ribosomal RNA (rRNA) gene was used to characterize the microbial composition of the lungs. The results showed that the prevalence of MTB in the BAL samples was 42.9% (70/163) among the sputum-negative patients. The α-diversity of lung microbiota was significantly less diverse in MTB+ patients compared with Mycobacterium tuberculosis-negative (MTB−) patients. There was a significant difference in β-diversity between MTB+ and MTB− patients. MTB+ patients were enriched with Anoxybacillus, while MTB− patients were enriched with Prevotella, Alloprevotella, Veillonella, and Gemella. There was no significant difference between the Anoxybacillus detection rates of MTB+ and MTB− patients. The paired comparison between the BAL samples from MTB+ patients and their negative conversion showed that BAL negative-conversion microbiota had a higher α-diversity. In conclusion, distinct features of airway microbiota could be identified between samples from patients with and without MTB. Our results imply links between lung microbiota and different clinical groups of active PTB.
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Acknowledgements
This work was supported by CAMS Innovation Fund for Medical Sciences (2017-I2M-3-017, 2016-I2M-1-013), the 13th-Five-Year National Science and Technology Major Project on the “prevention and treatment of AIDS, viral hepatitis and other infectious diseases” (2018ZX10711001, 2017ZX10201301-002-002), National Natural Science Foundation of China (81525016) and the Non-profit Central Research Institute Fund of CAMS (2019PT31006, 2019PT31007).
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Table S1 Demographic and clinical characteristics of the study population
Figure S1 Rarefaction curves showing total observed species per sample across multiple read depths, indicates that 36,000 reads results in good community coverage, demonstrated by curves approaching a plateau.
Figure S2 Bacterial composition of bronchoalveolar lavage fluid (BAL) samples collected from 163 patients and the relative abundance of the most abundant phyla and genera (representing 98.9% of the total reads).
Figure S3 (A–C) Antibiotic administration, age and smoking status showed no difference between microbial community states (MCS). (D) Detection rate of Mycobacterium in BALs varied between microbial community states (MCS) (chi-square test, P=0.006).
Figure S4 Paradigm for evaluating suspected patients with pulmonary tuberculosis.
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Hu, Y., Kang, Y., Liu, X. et al. Distinct lung microbial community states in patients with pulmonary tuberculosis. Sci. China Life Sci. 63, 1522–1533 (2020). https://doi.org/10.1007/s11427-019-1614-0
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DOI: https://doi.org/10.1007/s11427-019-1614-0