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E1k, another quantitative variant at cholinesterase locus 1.

H M Rubinstein, A A Dietz, T Lubrano

    Journal of Medical Genetics
    |February 1, 1978
    PubMed
    Summary
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    Researchers identified a new cholinesterase allele (E1k) in families with the atypical (E1a) variant. This E1k allele reduces usual serum cholinesterase molecules by approximately 33%.

    Area of Science:

    • Biochemistry
    • Human Genetics
    • Enzymology

    Background:

    • Cholinesterase locus 1 (CHEL1) encodes serum cholinesterase.
    • Genetic variants of CHEL1 can affect enzyme activity and levels.
    • The atypical (E1a) allele is a known variant affecting cholinesterase function.

    Observation:

    • Families were studied due to segregation of the E1a allele.
    • Unusual dibucaine inhibition patterns were observed.
    • A novel allele, designated E1k, was identified within these families.

    Findings:

    • Enzymatic and immunological data support the existence of the E1k allele.
    • The E1k allele is associated with a reduction of approximately 33% in 'usual' (E1u) cholinesterase molecules.
    • The mechanism causing this reduction (synthesis or degradation) is currently unknown.

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    Implications:

    • Discovery of E1k expands the known genetic diversity of human cholinesterase.
    • Understanding E1k's mechanism is crucial for interpreting enzyme activity variations.
    • Further research is needed to elucidate the molecular basis of E1k's effect on serum cholinesterase levels.