Using this approach, six functional markers across four dopamine genes (DRD2, ANKK1, COMT, DAT1) revealed that the BED group had a higher multi-locus genetic profile score than obese individuals without BED, suggesting that those with BED have stronger dopamine signaling in the brain’s striatum and are more responsive to rewards [16]. Here, DRD2 is linked to X-linked cone dysfunction syndrome with myopia.