Your parents’ genes—even those you didn’t inherit—leave a measurable imprint on your height, weight, and academic abilities. A new study from the Institute of Science and Technology Austria (ISTA) and the Norwegian Institute of Public Health, published in Cell Genomics, analyzed genetic data from over 30,000 parent-child trios to separate the direct effects of inherited DNA from the environmental influence of uninherited parental genes, a phenomenon called “genetic nurture.”
The Research
The team, led by scientists at ISTA, used data from the Norwegian Mother, Father, and Child Cohort and the Estonian Biobank. They focused on three traits measured in children around age 10: height, body mass index (BMI), and scores on national standardized school tests. By teasing apart direct genetic inheritance from indirect genetic nurture and parent-of-origin imprinting (where some genes are active only when inherited from one parent), they found that the environmental environment created by parents’ uninherited genes—such as the home atmosphere, parenting behaviors, and nutritional choices—can be nearly as powerful as the DNA a child physically inherits.
Key findings include:
- Shared genetic loci: The same chromosomal locations influence traits through both direct inheritance and environmental nurture, meaning identical parental genes affect a child via two parallel tracks.
- Parent-of-origin effects: Some genes are chemically switched off in either eggs or sperm, so certain variants only take effect if inherited from the parent where the gene remains active. This explains why identical genetic sequences can lead to different outcomes depending on which parent contributed them.
- Assortative mating correction: The model mathematically accounted for the fact that people often choose partners with similar traits (e.g., tall individuals marry tall partners), preventing skewed results.
Why It Matters for Your Brain
For cognitive traits like academic performance, these indirect genetic influences are just as relevant as for physical traits. The study underscores that intelligence is not solely a product of your own DNA; it emerges from a rich blend of inherited genes and an environment shaped by your parents’ genomes. This means your cognitive abilities—and those of your children—are influenced by factors beyond simple Mendelian inheritance. Understanding this can reduce the stigma around inherent ability and highlight the power of environment in learning and development. For personalized medicine, the rule is clear: only genetic regions with a direct effect on the individual are viable drug targets; indirect environmental paths must be addressed through policy and education.
What You Can Do
Curious about how your own genes interact with your environment? While you can’t change your inherited DNA, you can optimize your cognitive environment: engage in brain training, get quality sleep, maintain social connections, and pursue lifelong learning. These evidence-based factors can help you reach your cognitive potential regardless of your genetic starting point.
Source: Neuroscience News
Curious about your own brain? Take our free adaptive IQ test or try 306 brain training levels.
