Circulating Proteins Influencing Psychiatric Disease: A Mendelian Randomization Study.

Area of Science:

• Genetics
• Psychiatry
• Proteomics

Background:

• Psychiatric disorders require novel drug targets.
• Circulating proteins are promising candidates due to their accessibility and signaling roles.

Purpose of the Study:

• To investigate associations between circulating protein levels and the risk of 10 psychiatric disorders using Mendelian randomization.
• To identify potential protein biomarkers and therapeutic targets for psychiatric conditions.

Main Methods:

• Two-sample Mendelian randomization analyses were conducted.
• Genetic variants for 1611 circulating proteins from large proteomic studies served as instruments.
• Sensitivity analyses, including tests for horizontal pleiotropy and colocalization, were performed to ensure robustness.

Main Results:

• Nine robust protein-disease associations were identified after rigorous sensitivity analyses.
• Increased TIMP4 levels were associated with reduced risk of anorexia nervosa and bipolar disorder.
• Elevated ESAM levels were linked to an increased risk of schizophrenia, with suggestive associations for 58 other proteins.

Conclusions:

• Specific circulating proteins, such as TIMP4 and ESAM, show significant associations with psychiatric disorder risk.
• These proteins represent potential targets for future therapeutic interventions in psychiatry.
• Further validation of suggestive associations is warranted to expand the scope of protein-based psychiatric treatments.