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Related Experiment Videos

Multiple dopamine D4 receptor variants in the human population.

H H Van Tol1, C M Wu, H C Guan

  • 1Laboratory for Molecular Neurobiology, Clarke Institute of Psychiatry, Toronto, Ontario, Canada.

Nature
|July 9, 1992
PubMed
Summary

The dopamine D4 receptor exhibits genetic variations in humans, influencing how individuals respond to antipsychotic medications like clozapine. These dopamine D4 receptor polymorphisms may explain differences in neuropsychiatric disease susceptibility and treatment effectiveness.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Human Genetics

Background:

  • The dopamine D4 receptor shares similarities with D2 and D3 receptors.
  • Clozapine, an atypical antipsychotic, binds with higher affinity to D4 receptors, potentially explaining its unique therapeutic profile and reduced side effects.

Purpose of the Study:

  • To investigate genetic variations in the human dopamine D4 receptor.
  • To explore the functional consequences of these variations on receptor binding properties.

Main Methods:

  • Analysis of the human D4 receptor coding sequence for polymorphic variations.
  • Cloning and expression of complementary DNA for identified receptor variants.
  • Assessment of clozapine and spiperone binding affinities to different D4 receptor variants.

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Main Results:

  • Identification of at least three polymorphic variations in the human D4 receptor gene, including repeat variations (D4.2, D4.4, D4.7).
  • Functional differences observed in clozapine and spiperone binding between long (D4.7) and short (D4.2, D4.4) receptor variants.
  • This represents the first report of polymorphic variation within the human catecholamine receptor family.

Conclusions:

  • Human dopamine D4 receptor exhibits significant polymorphic variation.
  • These genetic differences in dopamine D4 receptors may contribute to individual variability in susceptibility to neuropsychiatric disorders.
  • D4 receptor polymorphisms could influence patient response to antipsychotic drug treatments.