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. 2024 Apr 19;10(16):eadj1987.
doi: 10.1126/sciadv.adj1987. Epub 2024 Apr 19.

Tissue-specific genetic variation suggests distinct molecular pathways between body shape phenotypes and colorectal cancer

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Tissue-specific genetic variation suggests distinct molecular pathways between body shape phenotypes and colorectal cancer

Laia Peruchet-Noray et al. Sci Adv. .

Abstract

It remains unknown whether adiposity subtypes are differentially associated with colorectal cancer (CRC). To move beyond single-trait anthropometric indicators, we derived four multi-trait body shape phenotypes reflecting adiposity subtypes from principal components analysis on body mass index, height, weight, waist-to-hip ratio, and waist and hip circumference. A generally obese (PC1) and a tall, centrally obese (PC3) body shape were both positively associated with CRC risk in observational analyses in 329,828 UK Biobank participants (3728 cases). In genome-wide association studies in 460,198 UK Biobank participants, we identified 3414 genetic variants across four body shapes and Mendelian randomization analyses confirmed positive associations of PC1 and PC3 with CRC risk (52,775 cases/45,940 controls from GECCO/CORECT/CCFR). Brain tissue-specific genetic instruments, mapped to PC1 through enrichment analysis, were responsible for the relationship between PC1 and CRC, while the relationship between PC3 and CRC was predominantly driven by adipose tissue-specific genetic instruments. This study suggests distinct putative causal pathways between adiposity subtypes and CRC.

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Figures

Fig. 1.
Fig. 1.. Flowchart summarizing study methods.
Body shape phenotypes have been derived by a PCA on six anthropometric traits (BMI, weight, height, WHR, WC, and HC). PC1 showed high and same sign loadings for all traits except height. PC2 showed high but opposite loadings for height and WHR. PC3 was characterized by high and same direction loadings for height and WHR. PC4 showed high loadings for weight and BMI and low loadings for HC and WC. QC, quality control.
Fig. 2.
Fig. 2.. Observational (dark blue) and MR (light blue) estimates of associations between body shape phenotype PC1, PC2, PC3, and PC4, per 1 standard deviation increments, and the risk of CRC (overall, among men, among women, and CRC subsites).
CI, confidence interval; CRC, colorectal cancer; PC, principal component. For observational and MR analyses, cancer cases were 3728 and 52,775 for overall CRC, 2239 and 28,207 among men, 1489 and 24,568 among women, 2443 and 27,817 colon, 1285 and 13,713 rectal, 966 and 14,016 distal colon, and 1370 and 12,360 proximal colon subsites, respectively.
Fig. 3.
Fig. 3.. Manhattan plots showing the genetic associations of the four body shapes.
Fig. 4.
Fig. 4.. Genetic architecture and tissue expression profile analyses of the four body shape phenotypes (PC1 to PC4).
Genetic architecture (A) and tissue expression profile (B). Tissues reaching a P value of <1.67 × 10−3, after Bonferroni correction, are highlighted in darker colors. MAF, minor allele frequency.
Fig. 5.
Fig. 5.. Associations between body shape phenotype (PC1 to PC4) grouped gene sets and the risk of overall CRC.
OR, odds ratio.
Fig. 6.
Fig. 6.. Directed acyclic graph depicting the assumed causal relationship between body shape phenotypes and CRC risk with its confounding and mediating paths.

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