Research report
Do genetic factors contribute to the association between birth
weight and blood pressure?
K Christensena, H Støvringa, M McGueb
a Institute of Public
Health, Epidemiology, and Institute for Demography and Statistics,
University of Southern Denmark, Odense, Denmark, b Department of Psychology,
University of Minnesota, Minneapolis, USA
Correspondence to: Dr Christensen, Institute of Public Health (Epidemiology), University of Southern Denmark, Sdr Boulevard 23A, DK-5000 Odense C, Denmark (KChristensen{at}health.sdu.dk)
Accepted for publication 12 March 2001
OBJECTIVES
To evaluate
whether genetic factors contribute to the association between low birth
weight and increased blood pressure among adolescents.
DESIGN
Historical
cohort study of twin pairs. It was evaluated whether (1) a negative
association between birth weight and systolic blood pressure was found
in the overall twin sample and (2) whether the intrapair difference in
birth weight correlated with the intrapair difference in systolic blood
pressure
thereby controlling for the effect of genetic factors (all in
monozygotic and on average half in dizygotic pairs).
SETTING
The Minnesota
Twin Family Study.
PARTICIPANTS
1311
pairs of adolescent twins.
MAIN RESULTS
A
negative association between birth weight and systolic blood pressure
was retrieved in the overall sample. The regression coefficient after
controlling for current weight was
1.88 mm Hg/kg (SE 0.61), which
corresponds to results from previous studies of singleton adolescents.
The regression coefficient fell to
0.64 mm Hg/kg (SE 0.86) when the
intrapair analyses were used. The largest reduction was observed among
monozygotic twins: from
2.44 mm Hg/kg (SE 0.75) in the overall
monozygotic twin sample to
1.06 mm Hg/kg (SE 1.14) in the analyses
of the within monozygotic pair differences.
CONCLUSION
The
association between low birth weight and increased blood pressure later
in life is well established. "The fetal programming hypothesis"
suggests that the association is caused by intrauterine malnutrition
while a new hypothesis "the fetal insulin hypothesis" proposes that
genetically determined insulin resistance also contributes significantly to the association. A recent twin study of middle aged
twins showed no evidence for an influence of genetic factors while this
larger study provides support for the fetal insulin hypothesis: the
association between birth weight and blood pressure attenuated among
adolescents when genetic factors were controlled. Together this
suggests an important contribution of genetic factors to the
association between fetal growth and systolic blood pressure in adolescence.
Keywords: blood pressure; birth weight; twins
© 2001 by Journal of Epidemiology and Community Health
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