a specific pattern of the dopamine receptor DRD2 allele is associated with the anxious attachment style, whereas a variant of the serotonin 5-HT1A receptor was linked to avoidance. These two genes are known to play a role in many brain functions, including emotions, reward, attention, and importantly, also in social behavior and pair bonding. The authors conclude that “attachment insecurities are partially explained by particular genes, although there is still a great deal of individual difference variance that remains to be explained by other genes or social experiences.”
