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Heritability of free and receptor bound leptin in normal twins

Item Type:Article
Title:Heritability of free and receptor bound leptin in normal twins
Creators Name:Jordan, J. and Brabant, G. and Brinsuk, M. and Tank, J. and Horn, R. and Luft, F.C. and Busjahn, A.
Abstract:Free and receptor-bound leptin may be regulated by different mechanisms. Genes that influence the concentration of these fractions may have an important functional bearing. We determined circulating leptin receptor concentrations, bound as well as free leptin concentrations, and body composition in 24 monozygotic (MZ) and in 22 dizygotic (DZ) twin pairs. Bound leptin and leptin receptor concentrations were inversely correlated with body fat content. Free leptin concentrations were directly correlated with body fat content. The correlations in age- and sex-adjusted free leptin, bound leptin, and leptin receptor concentrations were higher between MZ twins than between DZ twins. Adjusted heritability (h2) estimates were 0.28 for free leptin, 0.73 for bound leptin, and 0.55 for leptin receptor. The genetic correlation with body fat was -0.58 for the leptin receptor, -0.20 for bound leptin, and 0.93 for free leptin. Our data are consistent with a strong genetic influence on leptin receptor and bound leptin and a weaker genetic influence on free leptin concentrations. The same genes that lower bound leptin and leptin receptor concentrations may increase fat mass or vice versa.
Keywords:Twin study, Heritability, Leptin, Bound leptin
Source:American Journal of Physiology Regulatory Integrative and Comparative Physiology
ISSN:0363-6119
Publisher:American Physiological Society (U.S.A.)
Volume:288
Page Range:R1411-R1416
Date:1 January 2005
Official Publication:https://doi.org/10.1152/ajpregu.00446.2004
PubMed:View item in PubMed

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