Abstract
Objective:
Birth weight reflects prenatal metabolic adaption and has been related to later-life obesity risk. This study aimed to evaluate whether birth weight modifies the effect of genetic susceptibility on obesity risk in young Chinese.
Methods:
We recruited 540 young (14–30 years) and obese patients (body mass index, BMI⩾30 kg m−2), and 500 age- and sex-matched normal-weight healthy individuals (BMI<23 kg m−2). We genotyped 23 BMI-associated genetic variants identified from recent genome-wide association studies (GWAS) in Caucasians with European ancestry with minor allele frequency>0.05 in HapMap Han Chinese in Beijing, China.
Results:
Six loci, including SEC16B, GNPDA2, BDNF, FTO, MC4R and TMEM160, were significantly associated with obesity risk, with odds ratio from 1.314 to 1.701. The 23 risk loci accounted for 6.38% of the genetic variance in obesity. We created two genetic risk scores (GRSs) by summing the risk alleles of all 23 (GRS1) and 6 obesity-associated (GRS2) genetic variants. Prediction of obesity was significantly improved (P<0.001) when the GRS1 and GRS2 were added to a model with age and gender, with improvement of discrimination for obesity by 0.8% and 2.7%, respectively. In addition, we found that the two GRSs interacted with birth weight in relation to obesity (Pinteraction<0.001). The genetic effect appeared to be more pronounced in individuals with normal range of birth weight (25–75%) than those with either low (<25%) or high (>75%) birth weight.
Conclusion:
We confirmed the associations of the single-nucleotide polymorphism tagging six loci reported in recent GWAS with obesity in young Chinese. Our data also suggest birth weight may significantly modify genetic susceptibility to obesity risk.
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Acknowledgements
This study was supported by the grants from the National Key Technologies Research and Development Program (2008ZX09312-0191200), the National Natural Science Foundation of China (No. 30700383, 30971077, 81030011, 81070670, 81170712), the Shanghai Science and Technology Commission (10dz1920802), the Ministry of Health on Research for special purpose (201002002 and 201202008), and the Key Project of Shanghai Science and Technology Commission on Biological Medicine (09411954400).
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Hong, J., Shi, J., Qi, L. et al. Genetic susceptibility, birth weight and obesity risk in young Chinese. Int J Obes 37, 673–677 (2013). https://doi.org/10.1038/ijo.2012.87
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DOI: https://doi.org/10.1038/ijo.2012.87
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