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Geographical variation in relationships between parental body size and offspring phenotype at birth

Sam Leary1, Caroline Fall, Clive Osmond

  • 1Medical Research Council, Environmental Epidemiology Unit, University of Southampton, Southampton, UK. s.d.leary@bristol.ac.uk

Acta Obstetricia Et Gynecologica Scandinavica
|August 25, 2006
PubMed

Insights

Maternal body composition significantly influences newborn size and proportions, explaining much geographical variation in neonatal phenotype. Paternal factors have a weaker effect compared to maternal measurements.

Area of Science:

  • Human biology and genetics
  • Maternal and child health
  • Anthropometry and neonatal development

Background:

  • Maternal body composition is a known determinant of offspring birth size and proportions.
  • Previous research primarily focused on maternal height and weight, with limited examination of effect sizes.
  • Paternal size and composition also influence fetal development, mainly via the fetal genome, but are less studied.

Purpose of the Study:

  • To investigate the effects of maternal and paternal size and body composition on neonatal phenotype.
  • To compare the magnitude of maternal versus paternal influences on newborn characteristics.
  • To explore geographical variations in neonatal phenotype and their determinants.

Main Methods:

  • Analysis of data from diverse populations (UK, Finland, India, Sri Lanka, China, DR Congo, Nigeria, Jamaica).
  • Inclusion of maternal measurements (n=16,418) taken at 30 weeks gestation and paternal size data (n=3,733).
  • Focus on singleton, live-born, term births to standardize analysis.

Main Results:

  • Maternal body composition differences explained a large portion of geographical variation in neonatal phenotype.
  • Maternal height predicted neonatal length, maternal head circumference predicted neonatal head size, and maternal skinfold thickness predicted neonatal skinfolds.
  • Paternal height and body mass index effects were generally weaker than corresponding maternal measurements.

Conclusions:

  • Maternal body composition is a primary driver of geographical differences in neonatal phenotype.
  • The significant impact of maternal measures suggests nutrition throughout the mother's life cycle influences fetal growth.
  • Further research is warranted on paternal influences and the genetic mechanisms governing fetal development.
Abstract

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