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Diabetes Care, Vol 23, Issue 6 831-837, Copyright © 2000 by American Diabetes Association
Polymorphism of the tumor necrosis factor-alpha receptor 2 gene is associated with obesity, leptin levels, and insulin resistance in young subjects and diet-treated type 2 diabetic patients
JM Fernandez-Real, J Vendrell, W Ricart, M Broch, C Gutierrez, R Casamitjana, J Oriola and C Richart
Diabetes Unit, Endocrinology and Nutrition, University Hospital of Girona Dr. Josep Trueta, Barcelona, Spain. endocrino@htrueta.scs.es
OBJECTIVE: Mice lacking the tumor necrosis factor-alpha receptor 2 (TNFR2)
gene fed a high-fat diet gain less weight and display reduced leptin and
insulin levels. In humans, plasma levels of the soluble fraction of TNFR2
(sTNFR2) circulate in proportion to the degree of insulin resistance. The
purpose of this study was to evaluate a polymorphism in the 3' untranslated
region of the TNFR2 gene on chromosome 1 in relation to BMI, leptin levels,
and insulin resistance. RESEARCH DESIGN AND METHODS: Using single-strand
conformation polymorphism, the polymorphism was analyzed in 107 nondiabetic
subjects (60 women, 47 men) and in 110 consecutive patients with type 2
diabetes (79 women, 31 men). In a subset of 33 healthy subjects, insulin
sensitivity (minimal model analysis) was also evaluated. RESULTS: Four
alleles of the TNFR2 gene were identified (A1, A2, A3, and A4). BMI and
serum leptin levels were significantly increased in young carriers of the
A2 allele. Plasma sTNFR2 levels were similar among the different TNFR2 gene
variants. However, in subjects who did not carry the A2 allele, in young
subjects, and in women, plasma sTNFR2 levels were proportional to BMI and
leptin levels. In the study sample, carriers of the A2 allele (n = 18)
showed significantly increased BMI, fat mass, waist-to-hip ratio, serum
total and VLDL triglyceride levels, and leptin levels and had a lower
insulin sensitivity index than noncarriers of the A2 variant (n = 15). The
frequency of the different alleles among diabetic subjects was similar to
that in the control population. However, diet-treated diabetic subjects (n
= 49) who were carriers of the A2 allele exhibited significantly higher BMI
and leptin levels than diet-treated noncarriers of the A2 allele.
CONCLUSIONS: The presence of the A2 allele in the TNFR2 gene may predispose
subjects to obesity and higher leptin levels, which may in turn predispose
them to insulin resistance or vice versa. The TNFR2 gene may be involved in
weight-control mechanisms.

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Copyright © 2000 by the American Diabetes Association.
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