Sung-Yoon Kang1, Hyojung Kim2, Sungwon Jung3,4, Sang Min Lee5, Sang Pyo Lee1. 1. Division of Pulmonology and Allergy, Department of Internal Medicine, Gil Medical Center, Gachon University College of Medicine, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon, 21565, Republic of Korea. 2. Department of Health Sciences and Technology, GAIHST, Gachon University, Incheon, Republic of Korea. 3. Department of Genome Medicine and Science, Gachon University College of Medicine, Incheon, Republic of Korea. sjung@gachon.ac.kr. 4. Gachon Institute of Genome Medicine and Science, Gil Medical Center, Gachon University College of Medicine, 38-13 Dokjeom-ro 3 beon-gil, Namdong-gu, Incheon, 21565, Republic of Korea. sjung@gachon.ac.kr. 5. Division of Pulmonology and Allergy, Department of Internal Medicine, Gil Medical Center, Gachon University College of Medicine, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon, 21565, Republic of Korea. sangminlee77@naver.com.
Abstract
BACKGROUND: The microbiota of the lower respiratory tract in patients with non-tuberculous mycobacterial pulmonary disease (NTM-PD) has not been fully evaluated. We explored the role of the lung microbiota in NTM-PD by analyzing protected specimen brushing (PSB) and bronchial washing samples from patients with NTM-PD obtained using a flexible bronchoscope. RESULTS: Bronchial washing and PSB samples from the NTM-PD group tended to have fewer OTUs and lower Chao1 richness values compared with those from the control group. In both bronchial washing and PSB samples, beta diversity was significantly lower in the NTM-PD group than in the control group (P = 2.25E-6 and P = 4.13E-4, respectively). Principal component analysis showed that the PSBs and bronchial washings exhibited similar patterns within each group but differed between the two groups. The volcano plots indicated differences in several phyla and genera between the two groups. CONCLUSIONS: The lower respiratory tract of patients with NTM-PD has a unique microbiota distribution that is low in richness/diversity.
BACKGROUND: The microbiota of the lower respiratory tract in patients with non-tuberculous mycobacterial pulmonary disease (NTM-PD) has not been fully evaluated. We explored the role of the lung microbiota in NTM-PD by analyzing protected specimen brushing (PSB) and bronchial washing samples from patients with NTM-PD obtained using a flexible bronchoscope. RESULTS: Bronchial washing and PSB samples from the NTM-PD group tended to have fewer OTUs and lower Chao1 richness values compared with those from the control group. In both bronchial washing and PSB samples, beta diversity was significantly lower in the NTM-PD group than in the control group (P = 2.25E-6 and P = 4.13E-4, respectively). Principal component analysis showed that the PSBs and bronchial washings exhibited similar patterns within each group but differed between the two groups. The volcano plots indicated differences in several phyla and genera between the two groups. CONCLUSIONS: The lower respiratory tract of patients with NTM-PD has a unique microbiota distribution that is low in richness/diversity.
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