Influence of DARPP-32 genetic variation on BOLD activation to happy faces.

Dopaminergic pathways play a crucial role in reward processing, and advanced age can modulate its efficiency. controls dopaminergic function and is a chemical nexus of reward processing. In 61 younger (20-30 years) and older adults (54% ♀) (65-74 years), we examined how blood-oxygen-level dependent (BOLD) activation to emotional faces, vary over genotypes at three single nucleotide polymorphism (SNPs), coding for Dduanyu37P-32 (rs879606; rs907094; 3764352). We also assessed age-magnification of Dduanyu37P-32 effects on BOLD activation. We found that major homozygote G, T or A genotypes, with higher cortical expression of higher dopamine receptor efficacy, and greater bias toward positive cues, had increased functional connectivity in cortical-subcortical circuits in response to happy faces, engaging the dorsal prefrontal cortex (DLPFC), fusiform gyrus (FG) and the midbrain (MB). Local BOLD response to happy faces in FG, and MB was age-dependent, so that older carriers of the major G, T or A alleles showed lesser activation than minor genotypes. These genetic variants of Dduanyu37P-32 did not modulate BOLD response to angry faces, or engagement of the inferior occipital gyrus, to happy or angry faces. Taken together our results lend support for a potential role of Dduanyu37P-32 genetic variants in neural response to potential reward triggering cues.

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