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On genetically determined human serum cholinesterases

P K Das

    Enzyme
    |January 1, 1976
    PubMed
    Summary

    Human serum cholinesterase exhibits genetic polymorphism with multiple alleles affecting enzyme activity. Understanding these variants, including silent genes, is crucial for clinical applications.

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    Area of Science:

    • Biochemistry
    • Human Genetics
    • Pharmacology

    Background:

    • Human serum cholinesterase (acetylcholine acyl-hydrolase; EC 3.1.1.8) exhibits genetic variations.
    • These variants influence drug metabolism, particularly short-acting muscle relaxants like suxamethonium.

    Purpose of the Study:

    • To discuss the polymorphism of human cholinesterase.
    • To relate genetic and chemical characteristics to enzyme function.

    Main Methods:

    • Review of existing literature on serum cholinesterase variants.
    • Analysis of genetic nomenclature and allelic classifications.
    • Discussion of molecular forms and electrophoretic identification.

    Main Results:

    • At least four alleles (usual, dibucaine-resistant, fluoride-resistant, silent) exist at the Ch1/E1 locus.
    • A second locus, Ch2/E2, accounts for other variants.
    • Evidence suggests the existence of numerous rare serum cholinesterase variants.

    Conclusions:

    • Human serum cholinesterase displays significant genetic polymorphism.
    • Further research is needed to clarify the transmission of silent genes.
    • Understanding these variants is essential for their clinical and functional implications.

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