Genetic Predisposition Between COVID-19 and Four Mental Illnesses: A Bidirectional, Two-Sample Mendelian...

Area of Science:

• Neuroscience
• Psychiatry
• Genetics

Background:

• The COVID-19 pandemic has raised concerns about its impact on mental health.
• Previous studies suggested links between COVID-19 and mental illness, but causal evidence was lacking.

Purpose of the Study:

• To investigate the potential causal association between COVID-19 severity and mental illnesses using genetic data.
• To explore the genetic links between COVID-19 and specific mental health conditions like ADHD, schizophrenia, bipolar disorder, and depression.

Main Methods:

• Employed Mendelian randomization (MR) analysis utilizing large-scale genome-wide association study (GWAS) summary data for four mental health conditions.
• Applied various MR methods including inverse-variance weighted, weighted median, and MR-Egger, alongside sensitivity analyses to ensure robustness.

Main Results:

• Mendelian randomization analysis revealed that attention-deficit/hyperactivity disorder (ADHD) significantly increases the risk of COVID-19 hospitalization (OR = 1.297).
• Genetically predicted COVID-19 was also significantly associated with an increased risk of schizophrenia (OR = 1.043).
• Sensitivity analyses supported these findings, indicating a modest causal association.

Conclusions:

• The study provides evidence for a modest causal association between COVID-19 and certain mental illnesses, specifically ADHD and schizophrenia.
• Highlights the need for preventative measures for individuals with ADHD and schizophrenia due to their increased vulnerability and the pandemic's widespread impact.
• Emphasizes the necessity for further research into the neurological effects of COVID-19.