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Related Experiment Videos

Age-specific genetic effects for blood pressure

K Tambs1, L J Eaves, T Moum

  • 1Department of Human Genetics, Medical College of Virginia, Richmond.

Hypertension (Dallas, Tex. : 1979)
|November 1, 1993
PubMed
Summary

Genetic factors significantly influence blood pressure, with correlations decreasing as age differences between relatives grow. This study highlights age-specific genetic effects, not shared environmental factors, as key drivers of familial blood pressure resemblance.

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Area of Science:

  • Human Genetics
  • Cardiovascular Physiology
  • Biometric Modeling

Background:

  • Familial resemblance in blood pressure is well-documented but the specific genetic and environmental contributions, particularly concerning age, remain incompletely understood.
  • Previous studies have reported varying correlation coefficients for blood pressure among relatives, potentially due to differences in methodology and sample characteristics.

Purpose of the Study:

  • To investigate the influence of age-specific genetic additive effects and non-shared environmental factors on systolic and diastolic blood pressure correlations in relatives.
  • To reconcile discrepancies in reported blood pressure correlations between nuclear family and twin studies.

Main Methods:

  • Analysis of a large Norwegian dataset including 43,751 parent-offspring pairs, 19,140 sibling pairs, and 169 twin pairs.

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  • Application of a biometric model incorporating age-specific genetic additive effects and unique environmental influences.
  • Examination of correlations across different age-difference strata within familial relationships.

    • Main Results:

    • Blood pressure correlations between relatives decreased significantly with increasing age differences.
    • A biometric model with age-specific genetic additive effects and non-shared environmental effects provided a good fit to the observed correlations.
    • No significant contribution from shared environmental factors was detected for blood pressure resemblance.
    • Exclusion of age-specific genetic influence parameters resulted in a poor model fit, underscoring the importance of age-dependent genetic effects.

    Conclusions:

    • Age-specific genetic factors play a crucial role in familial blood pressure aggregation.
    • The findings suggest that non-shared environmental factors, rather than shared ones, contribute to familial resemblance in blood pressure.
    • The study provides a potential explanation for the observed differences in blood pressure correlations between nuclear family and twin studies, emphasizing the role of age-dependent genetic influences.