Abstract
Background
The incidence of obesity has significantly increased worldwide. However, it is still unclear about the genetic susceptibility of obesity.
Methods
Here we performed the largest European meta-analysis of genome-wide association study, including 98,421 obesity cases and 2,108,019 healthy controls.
Results
We identified 322 novel genome-wide significant obesity-associated loci and 23 of 32 known loci. SNP-based heritability analyses revealed that common variants explain 17.19 ± 0.59% of genetic risk for obesity, whereas MiXeR predicted an estimated 1.6 million effective sample sizes explaining 90% of obesity-associated phenotypic variance. Across 345 obesity-associated loci, 2000 likely causal genes are indicated, and 410 causal genes are prioritized. Tissue specificity enrichment analyses demonstrated that obesity-related causal genes mainly expressed in brain putamen basal ganglia, hippocampus, amygdala, substantia nigra, and caudate basal ganglia. The genetic correlation and gene-set analyses showed that apart from obesity-related diseases, some brain diseases and mood (e.g., broad depression, neuroticism, mood swings), inflammatory and allergic diseases diseases (e.g., asthma, spondyloarthritis, Hashimoto thyroiditis), cardiovascular diseases (e.g., hypertension, myocardial infarction, coronary artery disease), and lung disease (e.g., interstitial lung disease, chronic obstructive pulmonary disease, lung cancer) have the positive correlations with obesity. Gene-drug interaction analysis suggested that obesity-associated genes overlapped with targets of current medications for obesity. Finally, we used this meta-analysis to explore some potential targets (e.g., GLP1R, SIGMAR1, MC4R) and drug repurposing (e.g., iloprost, flunarizine, edrophonium chloride) for obesity.
Conclusions
We identified 345 genome-wide significant loci, including 322 novel loci for obesity. Based on 345 loci, we provided new biological insights to the etiology of obesity. Of clinical interest, we provided some potential targets and drug repurposing for obesity.
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Data availability
The datasets generated during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank European Molecular Biology Laboratory-European Bioinformatics Institute (NHGRI-EBI), MRC Integrative Epidemiology Unit (IEU), and FinnGen Biobank for providing the summary statistics of obesity-associated GWAS. We thank the GTEx project for providing summary data for eQTL analysis. We thank the Yang Lab for providing the V8 release of the GTEx eQTL/sQTL summary data in SMR binary (BESD) format. We thank Junghyun Jung in the Mancuso lab for providing pre-computed predictive models for TWAS analysis.
Funding
This study was supported by grants from the National Natural Science Foundation of China (32270933), the R&D Program of the Beijing Municipal Education Commission (KZ202210025035), and the Chinese Institutes for Medical Research, Beijing (CX24PY07). The funding source had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
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Contributions
RW and GL conceived, initiated, and supervised the project. WS helped with the study design. RG, WS, JD, BZ, GZ, JQ, ZB, and HX collected and analyzed the data. RG, WS, JD, and BZ collected GWAS data and performed the meta-analysis, MAGMA, TWAS, SMR, and drug repurposing analysis. GZ, JQ, ZB, and HX collected GO/KEGG data and performed enrichment, gene set, and genetic overlap analysis. RW wrote a draft of the manuscript. All authors critically reviewed and revised the manuscript and agreed to the published version of the manuscript.
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The Ethics Committee of Beijing Institute of Brain Disorders in Capital Medical University approved this secondary analysis of publicly available datasets that were properly anonymized. Informed consent was obtained at the time of the ethically approved original data collection and is not required for this secondary analysis. All methods were performed in accordance with the relevant guidelines and regulations.
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Gao, R., Su, W., Deng, J. et al. Genome-wide meta-analysis with 2,206,440 individuals identifies 322 novel risk loci for obesity. Int J Obes (2025). https://doi.org/10.1038/s41366-025-01979-z
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DOI: https://doi.org/10.1038/s41366-025-01979-z


