Lung microbiome of stable and exacerbated COPD patients in Tshwane, South Africa

Study information

Reviewed Marked as Reviewed by Svetlana up on 2024-12-11

study design

cross-sectional observational, not case-control

Citation

PMID PubMed identifier for scientific articles.

34611216

DOI Digital object identifier for electronic documents.

https://doi.org/10.1038/s41598-021-99127-w

URI

https://www.nature.com/articles/s41598-021-99127-w

Authors

Goolam Mahomed T, Peters RPH, Allam M, Ismail A, Mtshali S, Goolam Mahomed A, Ueckermann V, Kock MM, Ehlers MM

Journal

Scientific reports

Year

2021

Chronic obstructive pulmonary disease (COPD) is characterised by the occurrence of exacerbations triggered by infections. The aim of this study was to determine the composition of the lung microbiome and lung virome in patients with COPD in an African setting and to compare their composition between the stable and exacerbated states. Twenty-four adult COPD patients were recruited from three hospitals. Sputum was collected and bacterial DNA was extracted. Targeted metagenomics was performed to determine the microbiome composition. Viral DNA and RNA were extracted from selected samples followed by cDNA conversion. Shotgun metagenomics sequencing was performed on pooled DNA and RNA. The most abundant phyla across all samples were Firmicutes and Proteobacteria. The following genera were most prevalent: Haemophilus and Streptococcus. There were no considerable differences for alpha and beta diversity measures between the disease states. However, a difference in the abundances between disease states was observed for: (i) Serratia (3% lower abundance in exacerbated state), (ii) Granulicatella (2.2% higher abundance in exacerbated state), (iii) Haemophilus (5.7% higher abundance in exacerbated state) and (iv) Veillonella (2.5% higher abundance in exacerbated state). Virome analysis showed a high abundance of the BeAn 58058 virus, a member of the Poxviridae family, in all six samples (90% to 94%). This study is among the first to report lung microbiome composition in COPD patients from Africa. In this small sample set, no differences in alpha or beta diversity between stable and exacerbated disease state was observed, but an unexpectedly high frequency of BeAn 58058 virus was observed. These observations highlight the need for further research of the lung microbiome of COPD patients in African settings.

Experiment 1

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Reviewed Marked as Reviewed by Svetlana up on 2024-12-11

Curated date: 2024/11/07

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Subjects

Location of subjects: South Africa

Host species Species from which microbiome was sampled. Contact us to have more species added.: Homo sapiens

Body site Anatomical site where microbial samples were extracted from according to the Uber Anatomy Ontology: Sputum

Condition The experimental condition / phenotype studied according to the Experimental Factor Ontology

Group 0 name Corresponds to the control (unexposed) group for case-control studies: Stable state chronic obstructive pulmonary disease (COPD) patients

Group 1 name Corresponds to the case (exposed) group for case-control studies: Exacerbated state chronic obstructive pulmonary disease (COPD) patients

Group 1 definition Diagnostic criteria applied to define the specific condition / phenotype represented in the case (exposed) group: Patients in the exacerbated state of chronic obstructive pulmonary disease (COPD).

Group 0 sample size Number of subjects in the control (unexposed) group: 18

Group 1 sample size Number of subjects in the case (exposed) group: 6

Antibiotics exclusion Number of days without antibiotics usage (if applicable) and other antibiotics-related criteria used to exclude participants (if any): Group 0: past month Group 1: past 24 hours

Lab analysis

Sequencing type: 16S

16S variable region One or more hypervariable region(s) of the bacterial 16S gene: V1-V3

Sequencing platform Manufacturer and experimental platform used for quantifying microbial abundance: Illumina

Statistical Analysis

Data transformation Data transformation applied to microbial abundance measurements prior to differential abundance testing (if any).: raw counts

Statistical test: DESeq2

Significance threshold p-value or FDR threshold used for differential abundance testing (if any): 0.2

MHT correction Have statistical tests be corrected for multiple hypothesis testing (MHT)?: Yes

Alpha Diversity

Chao1 Abundance-based estimator of species richness: unchanged

Simpson Estimator of species richness and species evenness: more weight on species evenness: unchanged

Signature 1

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Curated date: 2024/11/10

Curator: Aleru Divine

Revision editor(s): Aleru Divine, WikiWorks

Source: Figure 2

Description: Graph of the DESeq2 analysis showing the log2fold differential abundance of the different genera between the exacerbated state and stable state of disease (n=24) in the sputum microbiome of chronic obstructive pulmonary disease (COPD) participants.

Abundance in Group 1: increased abundance in

NCBI	Quality Control	Links
Actinomyces
Neisseria
Streptococcus
Prevotella
Lactobacillus
Veillonella
Haemophilus
Granulicatella

Revision editor(s): Aleru Divine, WikiWorks