Mendelian-Randomization Study Reveals Causal Relationships Between Blood Metabolites and Psychiatric Disorders.

Area of Science:

• Genetics and Genomics
• Metabolomics
• Psychiatric Research

Background:

• Metabolic dysregulation is common in psychiatric disorders, but causal links are unclear.
• Understanding these links is crucial for developing effective treatments.

Purpose of the Study:

• To investigate the bidirectional causal relationships between 8 psychiatric disorders and 1139 blood metabolites.
• To identify specific metabolites and psychiatric disorders with significant causal associations.

Main Methods:

• Bidirectional Mendelian randomization (MR) analyses were performed.
• Investigated causal links between attention deficit hyperactivity disorder (ADHD), anorexia nervosa (AN), anxiety, bipolar disorder (BIP), depression, posttraumatic stress disorder (PTSD), insomnia, schizophrenia (SCZ), and 1139 blood metabolites.

Main Results:

• Forward MR identified significant metabolite associations with bipolar disorder (34), schizophrenia (21), depression (56), and PTSD (1).
• Several metabolites, including N2,N2-dimethylguanosine and phosphatidylcholine acyl-alkyl C38:4, were linked to multiple psychiatric disorders.
• Reverse MR showed psychiatric disorders, such as depression, causally influence blood metabolite levels, affecting compounds like 21-hydroxypregnenolone disulfate and carotenoids.

Conclusions:

• The study reveals causal relationships between specific metabolites and psychiatric disorders.
• Identified metabolites may serve as potential therapeutic targets for psychiatric disorder prevention and treatment.