Exploring the Causal Relationships Between Psychiatric Disorders and Diabetic Retinopathy: A Mendelian Randomization...

Area of Science:

• Ophthalmology
• Psychiatry
• Genetics

Background:

• Diabetic retinopathy (DR) is a leading cause of vision loss associated with diabetes.
• The interplay between psychiatric disorders and DR risk is not fully understood.
• Investigating bidirectional causal links is crucial for understanding disease pathogenesis.

Purpose of the Study:

• To assess the causal relationship between genetically predicted psychiatric disorders and DR risk.
• To examine the reverse causal effect of DR on psychiatric disorders.
• To identify potential protective or risk factors for DR among psychiatric conditions.

Main Methods:

• A 2-sample bidirectional Mendelian randomization (MR) analysis was employed.
• Genetic variants from large-scale genome-wide association studies served as instrumental variables.
• Methods included inverse variance weighted, MR-Egger, and weighted median analyses to assess causality and address pleiotropy.

Main Results:

• Attention deficit hyperactivity disorder (ADHD) was identified as a significant protective factor for DR (OR=0.913, P < .001).
• No significant causal relationship was found between DR and other assessed psychiatric disorders (bipolar disorder, depression, OCD, personality disorders, schizophrenia, anxiety).
• Reverse MR analysis indicated no causal influence of DR on mental health disorders.

Conclusions:

• ADHD may exert a protective causal effect on the risk of developing diabetic retinopathy.
• Further research into ADHD-related neuroendocrine and vascular mechanisms is warranted to understand its role in DR.
• The study did not find evidence for a causal link between DR and other major psychiatric disorders.