
Figure 1
Flow chart of toxicogenomic analysis to identify relationships between air pollutants and COVID-19. CTD – Comparative Toxicogenomic Database (http://CTD.mdibl.org)

Figure 2
Network of genes associated with SO2, CO, PMx, NO2, and O3 exposure and COVID-19 disease complications (IL10, IL6, IL1B, and TNF) (black circles) and 20 related genes predicted by the GeneMANIA tool (http://geneMANIA.org/plug-in/) (grey circles). Panel A shows prevalence of interaction types (in percentages) and panel B networks for each interaction type
Table 1
Influence of air pollutants (SO2, CO, PMx, NO2 and O3) on protein secretion, mRNA expression, and protein expression of genes related to these air pollutants and COVID-19 disease complications (CTD Database; http://CTD.mdibl.org)
| Air pollutant | Interaction | IL10 | IL6 | IL1B | TNF |
|---|---|---|---|---|---|
| SO2 | Protein secretion | ↑ | |||
| mRNA expression | |||||
| Protein expression | ↑ | ↑ | ↑ | ||
| CO | Protein secretion | ↑ | |||
| mRNA expression | ↑ | ||||
| Protein expression | ↑ | ↑ | ↑↓ | ↑↓ | |
| PMx | Protein secretion | ↑↓ | ↑ | ↑ | ↑ |
| mRNA expression | ↑↓ | ↑↓ | ↑↓ | ||
| Protein expression | ↑↓ | ↑ | ↑↓ | ↑↓ | |
| NO2 | Protein secretion | ↑ | ↓ | ||
| mRNA expression | ↑ | ↑↓ | ↓ | ↑ | |
| Protein expression | ↑ | ↑ | ↑ | ↑ | |
| O3 | Protein secretion | ↑ | ↑ | ||
| mRNA expression | ↓ | ↑ | ↑↓ | ↓ | |
| Protein expression | ↓ | ↑ | ↑↓ | ↑↓ |
Table 2
Top 10 gene-disease pairs for genes related to both COVID-19 complications and air pollutants, along with the 20 predicted genes (DisGeNET database; http://www.disgenet.org)
| Gene | Disease | Disease class (DisGeNET) | Score |
|---|---|---|---|
| CEBPA | acute myelocytic leukaemia | neoplasms | 1.000 |
| TNFRSF1A | TNF receptor-associated periodic fever syndrome (TRAPS) | pathological conditions, signs and symptoms; congenital, hereditary, and neonatal diseases and abnormalities; skin and connective tissue diseases | 1.000 |
| TNFAIP3 | familial Behcet-like autoinflammatory syndrome | / | 0.710 |
| TNF | rheumatoid arthritis | skin and connective tissue diseases; musculoskeletal diseases; immune system diseases | 0.700 |
| IL10 | inflammatory bowel diseases | digestive system diseases | 0.700 |
| IL10 | systemic lupus erythematosus, systemic | skin and connective tissue diseases diseases; immune system | 0.700 |
| IL10 | Crohn's disease | digestive system diseases | 0.700 |
| IL6 | fever | pathological conditions, signs and symptoms | 0.700 |
| TNFAIP3 | systemic lupus erythematosus | skin and connective tissue diseases; immune system diseases | 0.700 |
| SQSTM1 | amyotrophic lateral sclerosis | nutritional and metabolic diseases diseases; nervous system | 0.700 |
