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Single-strand conformational polymorphism analysis of the lipoprotein lipase promoter identified a T--&gt;G transition at position -93. The frequency in healthy white men was 3.4% (n = 1575). There was an 83% allelic association between -93T--&gt;G and Asp9--&gt;Asn (D9N); all N9 mutations occurred on a -93G allele, but not all -93G mutations occurred on an N9 allele. It was thus possible to assess the effect on plasma triglyceride (Tg) levels of the rare -93G mutation in the presence of the wild-type D9. Carriers of the -93G, with genotype TG/DD, had significantly lower Tg levels than TT/DD individuals (1.36 versus 1.78 mmol/L, P = .01); carriers of both mutations (TG/DN) had the highest Tg levels (1.93 mmol/L). When the group was stratified above and below the sample mean for body mass index (BMI), carriers of the -93G on a D9 allele (TG/DD) were "protected" against the Tg-raising effect of obesity, as assessed by BMI. In Afro-Caribbeans (n = 91), the carrier frequency of -93G was 18-fold higher (63%), with weaker (17%) allelic association between -93G and N9. In vitro, the -93G promoter had 24% higher activity than the -93T in a rat smooth muscle cell line and 18% higher activity in a human adrenal cell line. A protein identified by band-shift assays bound to the -93G but not to the -93T allele, which may explain the lower Tg levels in -93G carriers.

arteriosclerosis, thrombosis, and vascular biology

A Common Mutation in the Lipoprotein Lipase Gene Promoter, −93T/G, Is Associated With Lower Plasma Triglyceride Levels and Increased Promoter Activity In Vitro