Genetic analysis of social-class mobility in five longitudinal studies

Area of Science:

• Behavioral genetics
• Sociogenomics
• Human quantitative genetics

Background:

• Polygenic scores from genome-wide association studies (GWAS) for education can predict educational and economic success.
• This prediction raises questions about whether genetics influences success through biological mechanisms or reflects social advantages.
• Distinguishing between biological and social pathways is crucial for understanding genetic influences on socioeconomic status.

Purpose of the Study:

• To investigate whether education-linked polygenic scores predict social mobility.
• To differentiate between biological mechanisms and social history in the genetic prediction of success.
• To examine the role of parental genetics in child socioeconomic attainment.

Main Methods:

• Analysis of over 20,000 individuals across five longitudinal studies in the US, UK, and New Zealand.
• Calculation of education polygenic scores derived from GWAS.
• Assessment of social mobility through intergenerational comparisons and sibling-difference analyses.

Main Results:

• Higher education polygenic scores were associated with greater educational attainment, career success, and wealth accumulation.
• Individuals with higher scores tended to originate from more affluent families.
• Crucially, higher polygenic scores predicted upward social mobility relative to parents, and within-family analyses confirmed this effect.
• Maternal polygenic scores also predicted child attainment, suggesting environmental mediation.

Conclusions:

• Education-linked polygenic scores are not merely correlates of privilege but actively influence an individual's social mobility.
• Genetic factors associated with education impact socioeconomic attainment through both individual predispositions and parental environmental influences.
• These findings highlight the complex interplay between genetics, environment, and socioeconomic outcomes.