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Genetic-environmental interactions in physical growth

R Martorell, C Yarbrough, A Lechtig

    Acta Paediatrica Scandinavica
    |September 1, 1977
    PubMed
    Summary
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    Parent-child height correlations were similar in both malnourished and well-nourished populations, suggesting genetics play a significant role in height variability across diverse nutritional statuses. This finding challenges previous assumptions about environmental factors being the sole drivers in malnourished groups.

    Area of Science:

    • Human Growth and Development
    • Genetics and Heritability
    • Nutritional Science

    Background:

    • Childhood stature variability is often attributed to health/nutrition in malnourished populations and genetics in well-nourished ones.
    • Previous research hypothesized lower parent-child correlations in height for malnourished populations compared to European samples.

    Purpose of the Study:

    • To investigate parent-child and sibling correlations in stature among malnourished Guatemalan children.
    • To compare these correlations with those reported for well-nourished populations.
    • To re-evaluate the relative contributions of genetics and environment to height variability in diverse populations.

    Main Methods:

    • Analysis of parent-child and sibling correlations in stature.
    • Comparison between malnourished Guatemalan and European samples.

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  • Statistical assessment of genetic and environmental influences on height.

    • Main Results:

    • Parent-child and sibling correlations for stature were found to be similar in both malnourished Guatemalan and European populations.
    • This similarity challenges the hypothesis that environmental factors solely determine height variability in malnourished groups.
    • The findings suggest genetic differences contribute significantly to stature variability, even in populations with poor nutrition.

    Conclusions:

    • Variability in stature among malnourished children reflects genetic differences as much as in developed nations.
    • While environmental factors like intergenerational socioeconomic and nutritional status may play a role, the exact contribution remains unsettled.
    • Regardless of the cause, body size variability in malnourished populations serves as a valuable indicator of overall health and nutrition.