Asociación Española
de Gastroenterología
Oncología Digestiva

Sabela Carballal Ramil
Coordinador

El grupo de trabajo de oncología de la Asociación Española de Gastroenterología (AEG) incluye a todos los socios y socias de AEG que comparten su interés por el conocimiento del cáncer gastrointestinal, incluyendo las formas hereditarias y de alto riesgo asociadas a estos tumores. La filosofía del grupo es promover la investigación colaborativa, impulsar las actividades formativas y fomentar la docencia relacionada con esta área de la especialidad de Aparato Digestivo.


A genome-wide association study on copy-number variation identifies a 11q11 loss as a candidate susceptibility variant for colorectal cancer.
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Autores: Fernandez-Rozadilla C, Cazier JB, Tomlinson I, Brea-Fernández A, Lamas MJ, Baiget M, López-Fernández LA, Clofent J, Bujanda L, Gonzalez D, de Castro L; EPICOLON Consortium, Hemminki K, Bessa X, Andreu M, Jover R, Xicola R, Llor X, Moreno V, Castells A, Ca

Referencia: Hum Genet. 2014 May;133(5):525-34. PubMed PMID: 24218287.

Abstract

Colorectal cancer (CRC) is a complex disease, and therefore its development is determined by the combination of both environmental factors and genetic variants. Although genome-wide association studies (GWAS) of SNP variation have conveniently identified 20 genetic variants so far, a significant proportion of the observed heritability is yet to be explained. Common copy-number variants (CNVs) are one of the most important genomic sources of variability, and hence a potential source to explain part of this missing genetic fraction. Therefore, we have performed a GWAS on CNVs to explore the relationship between common structural variation and CRC development. Phase 1 of the GWAS consisted of 881 cases and 667 controls from a Spanish cohort. Copy-number status was validated by quantitative PCR for each of those common CNVs potentially associated with CRC in phase I. Subsequently, SNPs were chosen as proxies for the validated CNVs for phase II replication (1,342 Spanish cases and 1,874 Spanish controls). Four common CNVs were found to be associated with CRC and were further replicated in Phase II. Finally, we found that SNP rs1944682, tagging a 11q11 CNV, was nominally associated with CRC susceptibility (p value = 0.039; OR = 1.122). This locus has been previously related to extreme obesity phenotypes, which could suggest a relationship between body weight and CRC susceptibility.