The Causal Relationship Between Choline Metabolites and Acute Acalculous Cholecystitis: Identifying ABCG8 as Colocalized Gene – PubMed Black Hawk Supplements

Background: Acute acalculous cholecystitis (AAC) is a type of cholecystitis with high mortality rate while its pathogenesis remains complex. Choline is one of the essential nutrients and is related to several diseases. This study aimed to explore the causal relationship between choline metabolites and AAC and its potential mechanisms.

Methods: This research utilized the two-sample Mendelian randomization method to investigate the causal relationship between choline metabolites and AAC. Additionally, multivariable Mendelian randomization and mediated Mendelian randomization were used to explore potential confounding effects from low-density lipoprotein (LDL), high-density lipoprotein (HDL), triglycerides (TGs), and coronary artery disease (CAD). Linkage disequilibrium score regression (LDSC), co-localization analysis, and enrichment analysis were used to investigate relevant molecular mechanisms.

Results: There is a negative causal relationship between total choline (OR [95%CI] = 0.9982 [0.9974, 0.9990], p = 0.0023), phosphatidylcholine (OR [95%CI] = 0.9983 [0.9976-0.9991], p = 0.0040), sphingomyelin (OR [95%CI] = 0.9980 [0.9971-0.9988], p = 0.0001), and AAC. The mediating effects of LDL were -0.0006 for total choline, -0.0006 for phosphatidylcholine, and -0.0008 for sphingomyelin, indicating a protective effect of total choline, phosphatidylcholine, and sphingomyelin on AAC. Colocalized SNP rs75331444, which is mapped to gene ABCG8, was identified for total choline (PPH4 = 0.8778) and sphingomyelin (PPH4 = 0.9344).

Conclusions: There is a causal relationship between choline metabolites and cholecystitis, mediated through the protective action of LDL. Our results suggest that ABCG8 may play a role in the development of non-calculous cholecystitis.