Exploring the connection between SARS-CoV-2 an infection and the human intestine microbiome

A latest research posted to the bioRxiv* preprint server assessed the connection between the human microbiome and coronavirus illness 2019 (COVID-19).

Study: Dissecting the Role of the Human Microbiome in COVID-19 via Metagenome-assembled Genomes. Image Credit: Jezper/Shutterstock
Research: Dissecting the Position of the Human Microbiome in COVID-19 through Metagenome-assembled Genomes. Picture Credit score: Jezper/Shutterstock

Numerous research have reported that extreme acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections could cause gastrointestinal (GI) manifestations in COVID-19 sufferers. These research point out that the GI tract may be an necessary goal for SARS-CoV-2 an infection. 

Concerning the research

The current research reconstructed the microbial genome utilizing microbiome samples obtained from COVID-19 sufferers to find out novel taxa and variations within the microbiome and assess their correlation to SARS-CoV-2 signs.

The workforce obtained metagenomic sequencing research and metadata highlighting sufferers with COVID-19 or non-COVID-19 management standing. The genomic reconstruction of the human microbiome utilizing the metagenomic sequencing information was carried out by using the perform modules of metaWRAP. It was first used to trim the uncooked sequence reads and take away the human contamination in every sequenced pattern. The clear reads have been then assembled, and the sequenced assemblies have been binned in keeping with the minimal size of contigs. The metagenome-assembled genomes (MAGs) have been then refined and used to judge the contamination and completeness of the bins.

The MAGs have been then grouped into species-level genome bins (SGBs). SGBs having a minimal of 1 reference genome have been referred to as identified SGBs, whereas these with no reference genomes have been referred to as unknown genomes (uSGBs). The MAGs have been then dereplicated, and the non-redundant MAGs (nrMAGs) have been categorized into medium-quality MAGs having completeness ranging between 50% and 90% and contamination of 5% or lesser and high-quality MAGs having completeness of 90% and extra and contamination of 5% or lesser.


The research outcomes confirmed {that a} complete of 514 microbiome samples have been obtained from 359 people, together with 96 nasopharyngeal and 418 fecal microbiome samples. Amongst these, 78.60% of the samples have been from COVID-19 sufferers, whereas 21.40% have been from non-COVID-19 controls.

Within the 11,584 MAGs obtained, the imply completeness was 87.5%, the imply contamination was 0.99%, with a imply genome dimension of two.6 megabases (Mb). The group of the MAGs resulted in 872 SGBs, together with 18.35% of uSGBs whereas the dereplication of the MAGs produced 5,403 nrMAGs with strain-level decision. These nrMAGs had a imply completeness of 86.87%, imply contamination of 0.99%, and a imply genomic dimension of two.4 Mb. Notably, 21.4% of the non-COVID-19 samples resulted in 38.94% of nrMAGs and 31.2% of MAGs, indicating the next contribution of non-COVID-19 samples than of COVID-19 samples to complete nrMAGS and MAGs.

Among the many complete variety of nrMAGs, 40.53% have been of medium high quality, and 59.74% have been of top quality. The workforce assigned 99.89% of the nrMAGs to the bacterial area and 0.11% to the archaeal area. Additionally, the nrMAGs predominantly belonged to 5 phyla with 60.61% of nrMAGs from the Firmicutes A, 14.03% from Actinobacteriota, 9.77% from Bacteroidota, 6.92% from Firmicutes, and three.07% from Proteobacteria.        

The alpha variety measures of the intestine microbiome have been markedly decrease in COVID-19 sufferers than in non-COVID-19 individuals. Nevertheless, no important variations have been discovered between the intestine microbiomes of COVID-19 sufferers and non-COVID-19 controls affected by pneumonia. Furthermore, no notable outcomes have been discovered within the nasopharyngeal microbiome samples for the affected person and the management teams. 

On the nrMAG-level, principal coordinates evaluation (PCoA) and permutational multivariate evaluation of variance (PERMANOVA) confirmed a outstanding distinction within the microbial neighborhood constructions of the COVID-19 sufferers and the non-COVID-19 controls. Additionally, the next variation was noticed throughout the affected person group than throughout the management group.

Among the many COVID-19 sufferers, larger alpha variety within the intestine microbiome was noticed in sufferers with milder illness severity. The nrMAGs composition in COVID-19-recovered sufferers was extra various than the non-COVID-19 controls than the pre-recovery COVID-19 sufferers. This indicated that the intestine microbiome of COVID-19 sufferers didn’t get better to a comparatively wholesome state quickly after recovering from COVID-19. Additionally, COVID-19 illness severity had a considerable constructive affiliation with the variations in intestine microbiomes between COVID-19 sufferers and controls.

A imply AUPRC (space underneath the precision-recall curve) worth of 0.971 and a imply AUROC (space underneath the receiver working attribute curve) worth of 0.981 confirmed that nrMAGs precisely indicated COVID-19 infections. The research additionally recognized key discriminatory nrMAGs and three particular nrMAGs that have been frequent between the 2 cohorts.


The research findings confirmed a major affiliation between the human intestine microbiome and COVID-19 an infection. The utilization of assembled genomic catalogs may show essential in using the metagenomic strain-level facets of SARS-CoV-2–human microbiome correlation for additional analysis.

*Essential discover

bioRxiv publishes preliminary scientific stories that aren’t peer-reviewed and, due to this fact, shouldn’t be thought to be conclusive, information scientific follow/health-related conduct, or handled as established info.

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