Dopamine Receptor Gene DRD4 7-Repeat Allele X Maternal Sensitivity Interaction on Child Externalizing Behavior Problems: Independent Replication of Effects at 18 Months.

We also did not detect significant (or trend-level) relationships between maternal sensitivity and child DRD4 genotype in the total sample or the European-ancestry sub-sample; a marginally significant difference in maternal sensitivity between the 7-allele carriers and non-carriers was seen in the African-American sub-sample only (N = 21), and thus future studies with larger sample sizes should further examine this trend.

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