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Schizophrenia: dopamine D1 receptor sequence is normal, but has DNA polymorphisms
1Department of Pharmacology, Clarke Institute of Psychiatry, University of Toronto, Ontario, Canada.
Summary
Genetic analysis of dopamine D1 receptors in schizophrenia revealed no alterations in the amino acid sequence, despite observed DNA variations. This suggests other factors may contribute to the dopamine system
Area of Science:
- Neuroscience
- Genetics
- Psychiatry
Background:
- Schizophrenia is linked to an overactive dopamine system.
- Reduced regulation of dopamine D2 receptors by dopamine D1 receptors is observed in schizophrenia brains.
Purpose of the Study:
- To investigate the human dopamine D1 receptor gene in individuals with schizophrenia.
- To determine if genetic variations in the dopamine D1 receptor are associated with schizophrenia.
Main Methods:
- Genomic DNA from seven schizophrenic individuals was sequenced.
- The dopamine D1 receptor gene was amplified using polymerase chain reaction.
- Gene sequencing was performed after subcloning.
Main Results:
- Three DNA polymorphisms were identified in the dopamine D1 receptor gene.
- The deduced amino acid sequence of the dopamine D1 receptor remained normal in all analyzed samples.
- Previous findings indicated a reduced link between dopamine D1 and D2 receptors in two of the subjects.
Conclusions:
- The dopamine D1 receptor gene sequence is not altered in schizophrenia.
- Observed DNA polymorphisms do not lead to changes in the dopamine D1 receptor's amino acid sequence.
- Further research is needed to understand the genetic underpinnings of dopamine dysregulation in schizophrenia.