Abstract
Introduction: Colorectal cancer is a public health burden in the world and Colombia. Recent genome wide association studies have identifi ed chromosomal regions associated with the disease, depicting variable risk between populations, owing to the demographic history and genetic ancestry. Objective: We aimed to study the colorectal cancer risk in Colombia provided for 20 genetic markers, by using 955 cases and 972 controls from the CHIBCHA consortium, in the context of global and local genetic ancestry.Methodology: The samples were genotyped using Axyom Affymetrix LAT and CUSTOME array in order to obtain the global genome genotypes including 20 risk SNPs. Statistical analysis was performed in PLINK (associations), ADMIXTURE (global ancestry), Elai
(local ancestry) and R language (logistic models). Results: Eleven chromosomal regions were associated with ORs ranging between 1.14-1.41 (p<0.05): 18q21.1, 19q13.11, 10p14, 14q.2.2, 20p12.3, 8q23.3, 6p21.2, 15q13.3 y 8q24.21. On average, a higher global European ancestry was associated with colorectal cancer risk (OR=3.016, IC 95%:1.162-7.894, p=0.00325). At the local chromosomal level two regions presented a signifi cant increment of European ancestry 6q23.2 (OR adjusted=1.378, CI95%: 1.202-1.580, p adjusted =4.2e-6) and 4p13 (OR adjusted=1.301, CI95%:1.137-1.489; p adjusted =0.00013). Conclusions: Genetic ancestry can be considered as a relevant factor for the colorectal cancer susceptibility in Colombia. Both Native American and European ancestry are accounting for the most part of population structure in the sample we studied, which could explain the differences for the colorectal cancer incidence between Latin American and European populations.
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