Genetic Study Links Panic Disorder Liability to Lower Blood Triglyceride Levels

A bidirectional Mendelian randomization study published in Cellular and Molecular Neurobiology has examined whether genetically influenced levels of blood and urine metabolites show causal links with eight common psychiatric disorders, and whether genetic liability to those disorders might instead shift metabolite levels. After correction for multiple testing, only one association survived: genetic predisposition to panic disorder was significantly associated with lower triglyceride levels (β = −0.028, 95% CI: −0.043 to −0.013; P < 0.001; FDR-P = 0.01). The authors describe the work as exploratory and caution that the findings warrant careful interpretation.

The research drew on genetic data for 35 human blood and urine metabolites published by the UK Biobank, using variants associated with these metabolites as instrumental variables. Psychiatric disorder data came from the FinnGen consortium and covered depression, anxiety disorder, generalized anxiety disorder, schizophrenia, post-traumatic stress disorder, panic disorder, somatoform disorder and bipolar disorder.

In the forward direction, testing whether metabolites influence psychiatric disorders, the inverse variance-weighted method was the primary analysis, supported by MR-Egger, weighted median, simple mode and weighted mode approaches. Several nominally significant associations emerged, including positive effects of cystatin C on depression and somatoform disorder, and of urea on generalized anxiety disorder and panic disorder. However, none of these remained statistically significant after false discovery rate correction, meaning they are consistent with chance findings in a large testing panel.

In the reverse direction, asking whether genetic liability to psychiatric disorders influences metabolite levels, the panic disorder–triglyceride association withstood FDR correction. Other suggestive associations in this direction did not survive multiple testing correction, with all showing P < 0.05 but FDR-P > 0.05. Sensitivity analyses using Cochran’s Q test and MR-Egger intercept tests were applied to check for heterogeneity and pleiotropy-related bias in the instrumental variable estimates.

The authors frame the study as providing limited, exploratory evidence for potential genetic associations between circulating metabolites and psychiatric disorders. They emphasize that while metabolic perturbations have been documented in psychiatric cohorts, whether such associations reflect causal relationships or secondary downstream consequences of illness remains unresolved, and this study does not settle that question. They call for further replication studies and mechanistic investigations to clarify the biological relevance of the observations, noting that the panic disorder–triglyceride result should be treated as a hypothesis for future work rather than an established causal pathway.

Subject of Research: Bidirectional Mendelian randomization analysis of causal links between blood and urine metabolites and psychiatric disorders

Article Title: Exploratory Analysis of Potential Causal Links Between Blood and Urine Metabolites and Psychiatric Disorders: A Bidirectional Mendelian Randomization Study

Article References: Li, X., Cai, J., Hu, Y., & Chen, Y. (2026). Exploratory Analysis of Potential Causal Links Between Blood and Urine Metabolites and Psychiatric Disorders: A Bidirectional Mendelian Randomization Study. Cellular and Molecular Neurobiology. https://doi.org/10.1007/s10571-026-01836-1

Image Credits: AI Generated

DOI: 10.1007/s10571-026-01836-1

Keywords: Mendelian randomization, psychiatric disorders, metabolites, triglycerides, panic disorder, UK Biobank, FinnGen, genetics, depression, anxiety, GWAS, epidemiology