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Mendelian randomization analyses support causal relationships between COVID-19 and changes in brain structure and

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Summary

This study used Mendelian randomization to investigate causal links between COVID-19 and brain changes. Findings suggest a weak causal relationship between COVID-19, brain imaging phenotypes, and neuropsychological symptoms.

Keywords:
Brain fogCOVID-19MRINeuroimagingNeuropsychologyPost-COVID condition

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Area of Science:

  • Neuroscience
  • Genetics
  • Infectious Diseases

Background:

  • Neuropsychiatric symptoms, including brain fog, are common after COVID-19.
  • Biological mechanisms underlying these symptoms are not well understood.
  • Previous observational studies suggest links to brain alterations, but causality remains uncertain.

Purpose of the Study:

  • To explore potential causal relationships between COVID-19 and brain imaging-derived phenotypes (IDPs).
  • To investigate causal links between COVID-19 and neuropsychological symptoms.
  • To assess the impact of COVID-19 on brain structure and function.

Main Methods:

  • Utilized summary statistics from genome-wide association studies (GWAS).
  • Conducted a two-sample Mendelian randomization (MR) analysis.
  • Included sensitivity analyses to ensure result robustness.

Main Results:

  • Identified causal relationships between COVID-19 and 22 cortical structure phenotypes, one subcortical brain structure phenotype, and five brain functional network phenotypes.
  • Found a causal link between COVID-19 and one neuropsychological symptom phenotype.
  • Observed predominantly negative correlations between COVID-19 and identified brain phenotypes.

Conclusions:

  • Suggests a weak causal relationship between COVID-19 and brain imaging-derived phenotypes (IDPs).
  • Indicates a potential causal link between COVID-19 and neuropsychological symptoms.
  • Highlights the need for further research to validate these associations and understand underlying mechanisms.