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A variant near the interleukin-6 gene is associated with fat mass in Caucasian men
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2010 (English)In: International Journal of Obesity, ISSN 0307-0565, E-ISSN 1476-5497, Vol. 34, no 6, 1011-1019 p.Article in journal (Refereed) Published
Abstract [en]

Context:Regulation of fat mass appears to be associated with immune functions. Studies of knockout mice show that endogenous interleukin (IL)-6 can suppress mature-onset obesity.Objective:To systematically investigate associations of single nucleotide polymorphisms (SNPs) near the IL-6 (IL6) and IL-6 receptor (IL6R) genes with body fat mass, in support for our hypothesis that variants of these genes can be associated with obesity.Design and Study Subjects:The Gothenburg Osteoporosis and Obesity Determinants (GOOD) study is a population-based cross-sectional study of 18- to 20-year-old men (n=1049), from the Gothenburg area (Sweden). Major findings were confirmed in two additional cohorts consisting of elderly men from the Osteoporotic Fractures in Men (MrOS) Sweden (n=2851) and MrOS US (n=5611) multicenter population-based studies.Main Outcome:The genotype distributions and their association with fat mass in different compartments, measured with dual-energy X-ray absorptiometry.Results:Out of 18 evaluated tag SNPs near the IL6 and IL6R genes, a recently identified SNP rs10242595 G/A (minor allele frequency=29%) 3' of the IL6 gene was negatively associated with the primary outcome total body fat mass (effect size -0.11 standard deviation (s.d.) units per A allele, P=0.02). This negative association with fat mass was also confirmed in the combined MrOS Sweden and MrOS US cohorts (effect size -0.05 s.d. units per A allele, P=0.002). When all three cohorts were combined (n=8927, Caucasian subjects), rs10242595(*)A showed a negative association with total body fat mass (effect size -0.05 s.d. units per A allele, P<0.0002). Furthermore, the rs10242595(*)A was associated with low body mass index (effect size -0.03, P<0.001) and smaller regional fat masses. None of the other SNPs investigated in the GOOD study were reproducibly associated with body fat.Conclusions:The IL6 gene polymorphism rs10242595(*)A is associated with decreased fat mass in three combined cohorts of 8927 Caucasian men.

Place, publisher, year, edition, pages
2010. Vol. 34, no 6, 1011-1019 p.
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Medical and Health Sciences
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URN: urn:nbn:se:uu:diva-125028DOI: 10.1038/ijo.2010.27ISI: 000278663500008PubMedID: 20157327OAI: oai:DiVA.org:uu-125028DiVA: diva2:318359
Available from: 2010-05-07 Created: 2010-05-07 Last updated: 2010-12-17Bibliographically approved

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Ljunggren, Östen

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