A Genetic Locus within the FMN1/GREM1 Gene Region Interacts with Body Mass Index in Colorectal Cancer Risk
- PMID: 37249599
- PMCID: PMC10391330
- DOI: 10.1158/0008-5472.CAN-22-3713
A Genetic Locus within the FMN1/GREM1 Gene Region Interacts with Body Mass Index in Colorectal Cancer Risk
Abstract
Colorectal cancer risk can be impacted by genetic, environmental, and lifestyle factors, including diet and obesity. Gene-environment interactions (G × E) can provide biological insights into the effects of obesity on colorectal cancer risk. Here, we assessed potential genome-wide G × E interactions between body mass index (BMI) and common SNPs for colorectal cancer risk using data from 36,415 colorectal cancer cases and 48,451 controls from three international colorectal cancer consortia (CCFR, CORECT, and GECCO). The G × E tests included the conventional logistic regression using multiplicative terms (one degree of freedom, 1DF test), the two-step EDGE method, and the joint 3DF test, each of which is powerful for detecting G × E interactions under specific conditions. BMI was associated with higher colorectal cancer risk. The two-step approach revealed a statistically significant G×BMI interaction located within the Formin 1/Gremlin 1 (FMN1/GREM1) gene region (rs58349661). This SNP was also identified by the 3DF test, with a suggestive statistical significance in the 1DF test. Among participants with the CC genotype of rs58349661, overweight and obesity categories were associated with higher colorectal cancer risk, whereas null associations were observed across BMI categories in those with the TT genotype. Using data from three large international consortia, this study discovered a locus in the FMN1/GREM1 gene region that interacts with BMI on the association with colorectal cancer risk. Further studies should examine the potential mechanisms through which this locus modifies the etiologic link between obesity and colorectal cancer.
Significance: This gene-environment interaction analysis revealed a genetic locus in FMN1/GREM1 that interacts with body mass index in colorectal cancer risk, suggesting potential implications for precision prevention strategies.
©2023 The Authors; Published by the American Association for Cancer Research.
Figures
![Figure 1. OR and 95% CI for colorectal cancer risk associated with BMI (per 5 kg/m2 increment). The OR and 95% CIs were calculated for individual participating studies and then meta-analyzed.](https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1ddc/10391330/c04ad3b00ab5/2572fig1.gif)
![Figure 2. LocusZoom plots for the interaction between rs58349661 (rs1975678 used as perfect LD proxy) and colorectal cancer. The genomic position is shown on the x-axis whereas the y-axis reports the −log10 of the P value of the interaction with BMI. Purple dot, rs1975678. The colors of the SNPs are based on their correlation with rs1975678. Previously known GWAS variants, with their references, are also included: rs17816465, rs1919364, rs12708491.](https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1ddc/10391330/4fcacb583647/2572fig2.gif)
![Figure 3. BMI in relation to colorectal cancer risk, stratified by genotype. Using normal BMI as the reference, risk for colorectal cancer was estimated for overweight and obesity across the genotypes of rs58349661.](https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1ddc/10391330/9b75e39465bc/2572fig3.gif)
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