LEPR polymorphisms and haplotypes in Mexican patients with colorectal cancer

• Published in: Biomédica
• Main Authors: Miriam Partida, Melva Gutiérrez, María de la Luz Ayala, Nelly Margarita Macías, Carlos Rogelio Alvizo, Jorge Peregrina
• Format: Article in Journal/Newspaper
• Language: English; Spanish
• Published: Instituto Nacional de Salud 2019
• Subjects: Opportunistic infections/epidemiology; HIV infections; socioeconomic factors; health status disparities; health systems; Medicine; R; Arctic medicine. Tropical medicine; RC955-962; Arctic
• Online Access: https://doi.org/10.7705/biomedica.v39i1.4091; https://doaj.org/article/405655b08b4540a79c2207a282ddb7fc

Introduction: Obesity and colorectal cancer could be linked by adipocytokines, which are proteins associated with cell proliferation. High levels of the adipocytokine leptin promote the development of colorectal cancer through its receptor. Objective: To determine the association between c.326A>G and c.668A>G LEPR gene polymorphisms and colorectal cancer. Materials and methods: DNA was extracted from the peripheral blood of 147 patients with sporadic colorectal cancer and 134 healthy people. Genotypes were obtained by PCRRFLP and the association was determined by the odds ratio (OR) test using the SPSS™, version 10.0, program. Haplotype frequencies and linkage disequilibrium were estimated by the Arlequin, version 3.5, software. Results: Both polymorphisms were in Hardy-Weinberg equilibrium. Only the c.326A>G heterozygous genotype revealed an increased risk for colorectal cancer development (OR=1.81, 95% CI=1.04-3.16, p=0.04). The AG haplotype showed a significant association with colorectal cancer (OR=0.58, 95% CI=0.35-0.96, p<0.03). Linkage disequilibrium between the variants was only evident for the patients group (r2=0.36). Conclusion: Our results suggest that AG individuals heterozygous for the c.326A>G LEPR variant have a higher risk of colorectal cancer development whereas the AG haplotype (c.326A/c.668G) has a protective effect in the Mexican population.