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Related Experiment Videos

The dopamine D2 receptor: two molecular forms generated by alternative splicing.

R Dal Toso1, B Sommer, M Ewert

  • 1Laboratory of Molecular Neuroendocrinology, ZMBH, Heidelberg, FRG.

The EMBO Journal
|December 20, 1989
PubMed
Summary
This summary is machine-generated.

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Researchers discovered two forms of the human dopamine D2 receptor (D2R) generated by alternative splicing. The predominant larger D2R form is found in the brain and pituitary, potentially coupling to different G proteins.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • The dopamine D2 receptor (D2R) is a key neurotransmitter receptor involved in various brain functions.
  • Previous studies identified a rat brain D2R, but human variants and their expression patterns were less understood.

Purpose of the Study:

  • To characterize the human dopamine D2 receptor (D2R) and investigate potential alternative splicing.
  • To determine the expression patterns of different D2R forms in human and rat tissues.

Main Methods:

  • Cloning of human dopamine D2 receptor cDNA from a pituitary library.
  • Polymerase chain reaction (PCR) and in situ hybridization to detect mRNA.
  • Gene analysis to identify coding sequences and exons.

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Main Results:

  • A human D2R variant was identified with an additional 29 amino acids in the intracellular domain compared to the rat form.
  • mRNA for both D2R forms was detected in human and rat pituitary and brain tissues.
  • The larger D2R form was predominant and expressed in dopaminergic neurons.

Conclusions:

  • Differential splicing of a separate exon generates two human D2R forms.
  • These D2R variants may couple to different G proteins, influencing signaling pathways.
  • Both D2R forms bind [3H]spiperone and inhibit adenylyl cyclase, confirming their D2 subtype identity.