Evidence for the Scarr-Rowe Effect on Genetic Expressivity in the Health and Retirement Study.
Michael A Woodley Of Menie1, Mateo Peñaherrera-Aguirre2, Curtis S Dunkel3
1Center Leo Apostel for Interdisciplinary Studies, Vrije Universiteit Brussel, Brussels, Belgium.
Summary
The Scarr-Rowe effect shows that genetic potential for cognitive ability is expressed more in higher socioeconomic status (SES) environments. This study confirms this gene-environment interaction using polygenic scores for educational attainment.
Area of Science:
- Behavioral genetics
- Cognitive psychology
- Sociology
Background:
- The Scarr-Rowe effect describes a gene-environment interaction where heritability of cognitive ability decreases with lower socioeconomic status (SES).
- Understanding how genetic predispositions for cognitive abilities are influenced by environmental factors is crucial.
Purpose of the Study:
- To investigate the Scarr-Rowe effect using a polygenic score for educational attainment (EA3) as a proxy for genetic predisposition.
- To examine the interaction between genetic factors (EA3) and environmental factors (parental educational attainment) on cognitive ability (IQ).
Main Methods:
- Utilized a polygenic score for educational attainment (EA3) and parental educational attainment (EA) as a proxy for parental SES.
- Employed hierarchical regression analysis to assess the interaction between EA3 and parental EA on participants' IQ scores.
- Controlled for population stratification effects using principal components (PCs) and various interaction terms.
Main Results:
- A significant positive interaction was found between EA3 and parental EA in predicting cognitive ability (IQ).
- The expressivity of the polygenic score for educational attainment on cognitive ability increased with higher parental educational attainment, supporting the Scarr-Rowe effect.
- While no overall sex differences were detected, the effect was significant in females but not males.
Conclusions:
- The findings support the Scarr-Rowe effect, demonstrating that genetic influences on cognitive ability are modulated by socioeconomic environment.
- This highlights the complex interplay between genes and environment in shaping cognitive development.
- Further research may explore sex-specific nuances of this gene-environment interaction.
Related Concept Videos
01:52Regression Toward the Mean
6.6K
Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when...
6.6K
02:20Longitudinal Research
12.8K
Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
12.8K
01:28Human Genetics
1.0K
Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
The complex relationship between genetics and psychology is observable through common biological components such...
The complex relationship between genetics and psychology is observable through common biological components such...
1.0K
01:23Behavioral Genetics and Its Designs
732
Behavior genetics explores how genetic inheritance influences human behavior. It focuses on how genes, passed from parents to offspring, contribute to the development of behavioral traits and tendencies. This branch of genetics seeks to understand the complex interplay between inherited genetic factors and environmental influences in shaping our behaviors.
The primary methodologies used in behavior genetics include family studies, twin studies, and adoption studies, each providing unique...
The primary methodologies used in behavior genetics include family studies, twin studies, and adoption studies, each providing unique...
732
01:29Bias in Epidemiological Studies
925
Biases can arise at various stages of research, from study design and data collection to analysis and interpretation. Recognizing and addressing these biases is essential to ensure the validity and reliability of epidemiological findings.Broadly speaking, biases in epidemiology fall into three main categories: selection bias, information bias, and confounding. A more detailed description of possible biases is:
925
01:20Gene-Environment Interactions
790
Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...
790