Question
How does polymorphism in xenobiotic metabolizing enzymes result in variation in response to the toxicants?
Answer :
Word Count : 414
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Polymorphism in xenobiotic metabolizing enzymes plays a crucial role in determining individual variability in response to toxicants. Xenobiotic metabolizing enzymes, including phase I enzymes such as cytochrome P450s (CYPs) and phase II enzymes like glutathione S-transferases (GSTs), UDP-glucuronosyltransferases (UGTs), and N-acetyltransferases (NATs), are responsible for the biotransformation of foreign compounds. These enzymes convert lipophilic xenobiotics into more hydrophilic forms, facilitating their excretion from the body. Polymorphisms in the genes encoding these enzymes can lead to altered enzyme activity, stability, or expression levels, thereby affecting the metabolism of toxicants. Phase I enzymes, particularly CYPs, introduce functional groups into xenobiotics through oxidation, reduction, or hydrolysis. Polymorphic variants in CYP genes can result in enzymes with increased, decreased, or absent activity. For instance, CYP2D6 is highly polymorphic, and individuals may be classified as poor, intermediate, extensive, or ultra-rapid metabolizers. Poor
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