孟德尔随机化
大脑大小
肠道菌群
因果推理
生物
心理学
计算生物学
神经科学
遗传学
医学
计量经济学
数学
免疫学
基因
放射科
遗传变异
基因型
磁共振成像
作者
Yiting Shi,Jiuqiang Han,Jing Guo,Xianding Wang,Long Qian,Hao Wu,Wei Shi,Rui Zhu,Jiahao Wang,Shanshan Dong,Lili Cui,Yan Wang,Yan Guo,Tie‐Lin Yang
标识
DOI:10.1016/j.biopsych.2024.02.1012
摘要
Growing evidence indicates that dynamic changes in gut microbiome can affect intelligence; however, whether these relationships are causal remains elusive. We aimed to disentangle the poorly understood causal relationship between gut microbiota and intelligence.We performed a two-sample Mendelian randomization (MR) analysis using genetic variants from the largest available genome-wide association studies of gut microbiota (n = 18,340) and intelligence (n = 269,867). Inverse-variance weighted method was used to conduct the MR analyses complemented by a range of sensitivity analyses to validate the robustness of the results. Considering the close relationship between brain volume and intelligence, we applied two-step MR to evaluate whether the identified effect was mediated by regulating the brain volume (n = 47,316) RESULTS: We found a risk effect of the genus Oxalobacter on intelligence (odds ratio (OR), 0.968 change in intelligence per standard deviation increase in taxa; 95% confidence interval, 0.952 to 0.985; P = 1.88×10-4) and a protective effect of the genus Fusicatenibacter on intelligence (OR, 1.053; 95% confidence interval, 1.024 to 1.082; P = 3.03×10-4). The two-step MR analysis further showed that the effect of genus Fusicatenibacter on intelligence was partly mediated by regulating the brain volume, with a mediated proportion of 33.6% (95% confidence interval, 6.8% to 60.4%; P = 0.014).Our results provide causal evidence indicating the role of the microbiome in intelligence. Our findings may help reshape our understanding of the microbiota-gut-brain axis and development of novel intervention approaches for preventing cognitive impairment.
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