• 1. National Clinical Research Center for Chinese Medicine Cardiology, Xiyuan Hospital, Chinese Academy of Chinese Medical Sciences, Beijing 100091, P. R. China;
  • 2. Experimental Research Center, China Academy of Chinese Medical Sciences, Beijing 100078, P. R. China;
  • 3. The Second Department of Gerontology, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing 100091, P. R. China;
LIU Yanfei, Email: yanfeitcm@163.com; LIU Yue, Email: liuyueheart@hotmail.com
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Objective Using the whole genome association study (GWAS) data, Mendel randomization (MR) method was used to find the causal relationship between oral flora and type 2 diabetes (T2D) and myocardial infarction (MI). Methods Genetic association data of oral microbiota were selected from the Chinese 4D-SZ cohort GWAS dataset, and T2D and MI outcome data were obtained from a large-scale cohort study in BioBank Japan. Four methods, including inverse variance weighting (IVW), were used to analyze the causal relationship between exposure and outcomes. Sensitivity analysis was conducted on significant MR results to further validate the robustness of the results. Results The results showed a total of 24 species of dorsal tongue flora and 13 species of salivary flora with a potential causal relationship with T2D. There were 12 species each of dorsal tongue and salivary flora with a potential causal relationship with MI.A total of 8 oral flora were found on the dorsum of the tongue and saliva that could affect both T2D and MI, namely Saccharimonadaceae, Treponemataceae, Prevotella, Haemophilus, Lachnoanaerobaculum, Campylobacter_A, Neisseria, and Streptococcus. Conclusion We identified 8 oral flora causally associated with both T2D and MI, suggesting that diabetes may play a role in promoting the progression of myocardial infarction by affecting the above oral flora.

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