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Genetic factors significantly influence birth weight, impacting long-term health and development. This study reveals that polygenic scores, reflecting genetic predispositions, are causally linked to birth weight and subsequent life outcomes.

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Area of Science:

  • Genetics
  • Developmental Biology
  • Public Health

Background:

  • Birth weight is a key predictor of life course outcomes, highlighting the significance of prenatal development.
  • The role of genetic factors versus in utero environmental conditions in determining birth weight remains an important question.

Purpose of the Study:

  • To investigate the molecular genetic correlates of birth weight.
  • To determine if genetic factors or prenatal environment are primary drivers of birth weight and subsequent development.

Main Methods:

  • Construction of polygenic scores in two large longitudinal studies (Born in Bradford and Wisconsin Longitudinal Study).
  • Utilized within-family sibling comparisons to assess causal effects.
  • Examined associations between polygenic scores, birth weight, and life course outcomes.

Main Results:

  • A 1 standard deviation increase in polygenic score was associated with approximately a 100-gram increase in birth weight.
  • Polygenic scores showed a causal association with birth weight, independent of shared family environments.
  • The polygenic score-birth weight link was stronger with longer gestation and higher maternal BMI, but not socioeconomic status.
  • Polygenic scores were also associated with social and cognitive outcomes.

Conclusions:

  • Genetic factors play a significant causal role in determining birth weight.
  • Birth weight itself, influenced by genetics, is related to healthy prenatal development and subsequent life outcomes.
  • Findings underscore the importance of genetic contributions to birth weight and its long-term health implications.