Genetic variation of FUT2 in a Peruvian population: identification of a novel LTR-mediated deletion and characterization of 4 nonsynonymous single-nucleotide polymorphisms.

BACKGROUND:The human FUT2 gene, which encodes a secretor type α(1,2)fucosyltransferase, is reported to have several population-specific single-nucleotide polymorphisms (SNPs) and copy number variations. However, little is known about genetic variation of FUT2 in Native Americans. STUDY DESIGN AND METHODS:To detect SNPs and copy number variations of the FUT2 gene in Peruvians, direct sequencing and digital polymerase chain reaction were performed. Haplotypes of observed SNPs were estimated by PHASE software or cloning into plasmids. The functional significance of nonsynonymous SNPs was examined by transient transfection assay. RESULTS:We identified three novel nonfunctional alleles (se^178,357 , se⁸⁴¹ , and se^del4 ) due to two nonsynonymous SNPs (178C > T and 841G > A) and a novel long terminal repeat-mediated recombination with a 4.3-kb deletion in 70 Peruvians. The frequency of nonfunctional alleles was relative low (20.7%). Because se⁸⁴¹ has a relatively high frequency (5.7%), it might be a suitable genetic marker for Peruvians. CONCLUSION:We identified three novel nonfunctional alleles in 70 Peruvians. To our knowledge, this is the first time a long terminal repeat-mediated gene recombination event at the FUT2 locus has been detected.

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