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Background  Several environmental and genetic factors are associated with high levels of lipids in obese patients. Apolipoprotein B (ApoB) is the major protein component of low-density lipoproteins (LDL), very-low density lipoproteins (VLDL) and chylomicrons and plays a central role in lipid metabolism. Several  apoB  restriction fragment length polymorphisms (XbaI, EcoRI, MspI) have been reported to be associated with variation in lipid levels and obesity. To date, no data are available on the relationship between XbaI polymorphism and lipid levels in Egyptian populations. Following clinical profiling, 178 obese (body mass index [BMI] >25 kg/m 2 ) and 178 age-matched non-obese (BMI ≤ 25 kg/m2) subjects were included in this case–control study. All samples were analysed for total cholesterol, triglycerides and HDL-cholesterol. Genetic analysis of  apoB  XbaI (X) was performed using Polymerase Chain Reaction-Restriction Fragment Length polymorphism (PCR-RFLP). The aim of this study was to assess the association of  apoB  XbaI gene polymorphism (X) and lipid profiles in obese and non-obese Egyptian populations.    Results  Obese subjects demonstrated significantly higher values of waist-to-hip ratio, blood pressure, and total lipid. However, in our sample we did not find significant differences in  apoB  XbaI gene polymorphism (X) genotype or allele frequencies. Moreover, none of the studied lipid parameters showed any association with the gene polymorphism.    Conclusion  This study reveals no significant association of  apoB  XbaI gene polymorphism (X) with obesity or lipid profiles in an Egyptian population.

No association of apolipoprotein B gene polymorphism and blood lipids in obese Egyptian subjects