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Innate Immune Gene Polymorphisms and COVID-19 Prognosis
Evangelos Bakaros1, Ioanna Voulgaridi2, Vassiliki Paliatsa1
1Department of Immunology & Histocompatibility, Faculty of Medicine, University of Thessaly, 41500 Larissa, Greece.
Viruses
|September 28, 2023
Summary
Certain genetic variations in innate immune genes, like IL18-rs1834481, TLR2-rs5743708, and TLR4-rs4986791, are linked to severe COVID-19 outcomes. These polymorphisms may help predict disease severity in patients.
Area of Science:
- Immunogenetics
- Infectious Disease Epidemiology
- Molecular Biology
Background:
- COVID-19 (Coronavirus Disease 2019) presents varied clinical outcomes.
- Host genetic factors, particularly innate immunity, influence SARS-CoV-2 (Severe Acute Respiratory Syndrome Coronavirus 2) infection severity.
- Identifying genetic risk factors can improve prognosis prediction for COVID-19.
Purpose of the Study:
- To investigate the association between specific innate immune gene polymorphisms and COVID-19 clinical severity.
- To determine if genetic variations in genes like TLR2, TLR4, and IL18 can predict disease progression.
- To explore the role of host genetics in COVID-19 pathogenesis.
Main Methods:
- Genotyping of innate immune gene polymorphisms (TLR2-rs5743708, TLR4-rs4986790, TLR4-rs4986791, CD14-rs2569190, CARD8-rs1834481, IL18-rs2043211, CD40-rs1883832) in 249 individuals.
- Classification of patients into five groups based on the WHO clinical progression scale.
- Statistical analysis to identify correlations between polymorphisms and clinical outcomes, including pneumonia and respiratory distress.
Main Results:
- The IL18-rs1834481 polymorphism was identified as an independent risk factor for pneumonia development.
- Carriage of TLR2-rs5743708 and TLR4-rs4986791 polymorphisms increased the probability of developing pneumonia (3.6-fold) and severe disease (2.5-fold), respectively.
- Elderly patients with obesity and/or diabetes mellitus showed increased susceptibility to pneumonia and respiratory distress.
Conclusions:
- Host genetic background significantly impacts the clinical phenotype of COVID-19.
- The IL18-rs1834481, TLR2-rs5743708, and TLR4-rs4986791 polymorphisms show potential as molecular predictors for COVID-19 clinical outcomes.
- Understanding genetic predispositions can aid in personalized risk assessment and management strategies for COVID-19.
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