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Prenatal ontogeny of D2 dopamine receptor and dopamine transporter gene expression in the rat mesencephalon
1URA-CNRS 1200, Laboratoire d'Histologie et Embryologie (UFR II), Université de Bordeaux II, France.
Abstract:
This work demonstrates the early prenatal expression (by gestational day 14) of dopamine D2 receptor and dopamine transporter mRNAs by immature dopaminergic cells of the rat mesencephalon using in situ hybridization. Our results indicate that mRNAs are detectable 3 days before the appearance of functional D2 presynaptic receptors and detectable dopamine release at striatal terminals.
Insights
This study found that dopamine D2 receptor and transporter mRNAs appear in developing rat brain cells by day 14 of gestation. These molecules are present before functional receptors and dopamine release are detectable in the striatum.
Area of Science:
- Neuroscience
- Developmental Biology
- Molecular Biology
Background:
- Dopaminergic system development is crucial for brain function.
- The precise timing of gene expression for dopamine receptors and transporters is not fully understood.
- Early prenatal development stages offer insights into neurodevelopmental processes.
Purpose of the Study:
- To investigate the prenatal expression patterns of dopamine D2 receptor and dopamine transporter mRNAs in the rat brain.
- To determine the temporal relationship between mRNA expression and the emergence of functional dopaminergic activity.
Main Methods:
- Utilized in situ hybridization to detect specific mRNA transcripts.
- Focused on immature dopaminergic cells in the rat mesencephalon.
- Examined gestational day 14 embryos.
Main Results:
- Dopamine D2 receptor and dopamine transporter mRNAs were detected by gestational day 14 in immature dopaminergic cells.
- mRNA expression preceded the appearance of functional D2 presynaptic receptors by three days.
- mRNA expression was detectable before measurable dopamine release at striatal terminals.
Conclusions:
- Dopamine D2 receptor and transporter genes are expressed early in prenatal development.
- This early gene expression occurs independently of functional receptor maturation and dopamine release.
- Provides a timeline for key molecular events in dopaminergic system development.