A polygenic score indexing a DRD2-related co-expression network is associated with striatal dopamine function

Area of Science:

• Neuroscience
• Genetics
• Psychiatry

Background:

• The D2 dopamine receptor (D2R) is crucial for antipsychotic drug action and brain functions implicated in schizophrenia.
• Genetic variations in the DRD2 gene are linked to schizophrenia.
• A polygenic co-expression index (PCI) for DRD2-co-expressed genes correlates with antipsychotic response and brain activity in schizophrenia patients.

Purpose of the Study:

• To investigate the association between the DRD2 gene network and in vivo striatal dopaminergic function.
• To explore the relationship between the DRD2 gene network and dopamine synthesis capacity in healthy subjects.

Main Methods:

• Utilized 18F-DOPA PET imaging in 92 healthy subjects.
• Genotyped subjects for genetic variations related to the DRD2 co-expression network to calculate the PCI.
• Analyzed the association between PCI and striatal dopamine synthesis capacity.

Main Results:

• The DRD2 gene network's PCI was significantly associated with whole striatal dopamine synthesis capacity (p=0.038).
• Exploratory analysis suggested a numerically larger effect in the associative striatum, though not statistically significant.
• These findings suggest a link between the DRD2 network and dopamine synthesis regulation.

Conclusions:

• The DRD2-related co-expression network may influence striatal dopamine synthesis.
• This provides a potential mechanism linking the DRD2 gene network to schizophrenia pathophysiology.
• Further research is needed to elucidate the underlying molecular mechanisms.