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Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
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Carnitine and COVID-19 Susceptibility and Severity: A Mendelian Randomization Study
Chunyu Li1, Ruwei Ou1, Qianqian Wei1
1Department of Neurology, Laboratory of Neurodegenerative Disorders, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China.
Frontiers in Nutrition
|December 13, 2021
Summary
Higher carnitine levels, determined genetically, were linked to reduced susceptibility and severity of COVID-19. This suggests carnitine may play a protective role against the virus.
Area of Science:
- Biochemistry
- Genetics
- Epidemiology
Background:
- Carnitine's molecular functions suggest potential protective effects against COVID-19.
- Previous research has not explored the correlation or causation between carnitine levels and COVID-19.
Purpose of the Study:
- To investigate the potential causal relationship between carnitine levels and COVID-19 susceptibility, severity, and hospitalization.
- To explore carnitine as a potential therapeutic target for COVID-19.
Main Methods:
- A two-sample Mendelian randomization (MR) analysis was employed.
- Genome-wide association study data for carnitine levels (N=7,824) and COVID-19 outcomes (N=1,467,264 to 1,887,658) were utilized.
- Multiple MR methods and sensitivity analyses were performed for robust evaluation.
Main Results:
- A genetically determined increase in carnitine levels was associated with significantly lower COVID-19 susceptibility (OR: 0.38, P: 4.77E-03).
- Carnitine levels showed a consistent inverse association with COVID-19 severity and hospitalization across various MR methods, although not all reached statistical significance with the primary method.
- Sensitivity analyses confirmed the robustness of the findings.
Conclusions:
- Genetic predisposition to higher carnitine levels may reduce the risk and impact of COVID-19.
- Carnitine's role in COVID-19 pathogenesis is highlighted, suggesting potential for future therapeutic strategies.
- Further clinical trials may explore carnitine-based interventions for COVID-19.
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