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BackgroundPrevalence of colorectal cancer (CRC) in the British Bangladeshi population (BAN) is low compared to British Caucasians (CAU). Genetic background may influence mutations and disease features.MethodsWe characterized the clinicopathological features of BAN CRCs and interrogated their genomes using mutation profiling and high-density single nucleotide polymorphism (SNP) arrays and compared findings to CAU CRCs.ResultsAge of onset of BAN CRC was significantly lower than for CAU patients (p=3.0 x 10-5) and this difference was not due to Lynch syndrome or the polyposis syndromes. KRAS mutations in BAN microsatellite stable (MSS) CRCs were comparatively rare (5.4%) compared to CAU MSS CRCs (25%; p=0.04), which correlates with the high percentage of mucinous histotype observed (31%) in the BAN samples. No BRAF mutations was seen in our BAN MSS CRCs (CAU CRCs, 12%; p=0.08). Array data revealed similar patterns of gains (chromosome 7 and 8q), losses (8p, 17p and 18q) and LOH (4q, 17p and 18q) in BAN and CAU CRCs. A small deletion on chromosome 16p13.2 involving the alternative splicing factor RBFOX1 only was found in significantly more BAN (50%) than CAU CRCs (15%) cases (p=0.04). Focal deletions targeting the 5' end of the gene were also identified. Novel RBFOX1 mutations were found in CRC cell lines and tumours; mRNA and protein expression was reduced in tumours.ConclusionsKRAS mutations were rare in BAN MSS CRC and a mucinous histotype common. Loss of RBFOX1 may explain the anomalous splicing activity associated with CRC.

Original publication

DOI

10.1186/1476-4598-12-1

Type

Journal article

Journal

Molecular cancer

Publication Date

03/01/2013

Volume

12

Addresses

Centre for Digestive Diseases, Blizard Institute of Cell and Molecular Science, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, 4 Newark St, Whitechapel, London, E1 2AT, UK.

Keywords

Cell Line, Tumor, Humans, Adenocarcinoma, Mucinous, Colorectal Neoplasms, ras Proteins, Proto-Oncogene Proteins B-raf, RNA-Binding Proteins, Proto-Oncogene Proteins, DNA Mutational Analysis, Gene Deletion, Gene Dosage, Loss of Heterozygosity, Polymorphism, Single Nucleotide, Adult, Aged, Aged, 80 and over, Middle Aged, European Continental Ancestry Group, Bangladesh, Female, Male, Proto-Oncogene Proteins p21(ras), Young Adult, United Kingdom, RNA Splicing Factors