Expression of human paraoxonase (PON1) during development

Pharmacogenetics
Toby B ColeClement E Furlong

Abstract

Paraoxonase (PON1), a HDL-associated enzyme, protects against toxicity from specific organophosphorus compounds and oxidized lipids. Common polymorphisms in the PON1 gene have been identified and characterized in the coding region, 5' regulatory region and 3' UTR. The Q192R coding region polymorphism determines substrate-dependent differences in catalytic efficiency of hydrolysis. The -108CT polymorphism in the 5' regulatory region has a significant effect on PON1 expression, with the -108C allele expressing on average twice the level of plasma PON1 as the -108T allele. In addition to the effects of regulatory and coding region polymorphisms on PON1 levels and activity, plasma PON1 levels are also developmentally regulated. Since PON1 levels are important in determining resistance to specific organophosphorus compounds, the time course of appearance of PON1 in newborns is of great interest. We report here that PON1 levels plateau between 6 to 15 months of age, and that variability in the age at which PON1 levels plateau is quite variable among individuals. In mice and rats, plasma PON1 activity reaches a plateau at 3 weeks of age. In mice that lack endogenous PON1, human transgenes encoding either PON1(Q192) or PON1(R192) under...Continue Reading

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