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A new high activity plasma cholinesterase variant.

A Krause¹, A B Lane, T Jenkins

¹Department of Human Genetics, School of Pathology, South African Institute for Medical Research, Johannesburg.

Journal of Medical Genetics

|October 1, 1988

Summary

A novel high activity plasma cholinesterase variant was identified in a South African family. This enzyme variant exhibits increased heat stability and specific activity, potentially inherited as a dominant trait.

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Area of Science:

Biochemistry
Human Genetics
Enzymology

Background:

Plasma cholinesterase (pseudocholinesterase) is crucial for metabolizing certain drugs.
Enzyme variants can affect drug efficacy and safety.
Genetic variations in cholinesterase activity are observed in diverse populations.

Purpose of the Study:

To characterize a newly discovered plasma cholinesterase variant.
To investigate the inheritance pattern and biochemical properties of this variant.
To assess the implications of this variant on enzyme activity.

Main Methods:

Electrophoresis was used to determine enzyme mobility.
Heat stability assays were performed to assess enzyme resilience.
Specific activity measurements quantified enzyme function.

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Family studies were conducted to trace inheritance patterns.

Main Results:

A new plasma cholinesterase variant with normal electrophoretic mobility but increased heat stability was identified.
The variant demonstrated higher specific activity compared to the usual enzyme.
The increased activity was linked to a normal number of enzyme molecules.
Preliminary data suggested dominant inheritance, though the genetic locus remains undetermined.

Conclusions:

A unique high-activity plasma cholinesterase variant exists in a South African family.
This variant possesses distinct biochemical properties, including enhanced stability and activity.
The variant may be inherited in an autosomal dominant manner.
Further research is needed to pinpoint the genetic locus and fully understand its clinical significance.