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Insulin-induced gene 2 (insig-2) protein is known to play important roles in cholesterol and TAG metabolism both in vivo and in vitro. One particularly interesting single nucleotide polymorphism (SNP), rs7566605, located 10 kb upstream of INSIG2 was reported to have the strongest association with obesity among 86 604 SNP, while the relationship with dyslipidaemia is uncertain. Eight hundred and eighty-five Japanese Americans (347 men and 538 women) and 378 Japanese (182 men and 196 women) were enrolled, and the rs7566605 SNP, which is consistent with either G or C, was determined. We investigated the association between the rs7566605 SNP and the prevalence of hypercholesterolaemia or hypertriacylglycerolaemia, or obesity parameters, as assessed by BMI, waist girth and percentage body fat. There were no significant differences in BMI, waist girth and percentage body fat according to the …