The interleukin-6 (-174) G/C promoter polymorphism is associated with type-2 diabetes mellitus in Native Americans and Caucasians
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The interleukin-6 (-174) G/C promoter polymorphism is associated with type-2 diabetes mellitus in Native Americans and Caucasians. / Vozarova, Barbora; Fernández-Real, José-Manuel; Knowler, William C; Gallart, Lluis; Hanson, Robert L; Gruber, Jonathan D; Ricart, Wilfredo; Vendrell, Joan; Richart, Cristóbal; Tataranni, P Antonio; Wolford, Johanna K; de Courten, Barbora.
In: Human Genetics, Vol. 112, No. 4, 01.04.2003, p. 409-13.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - The interleukin-6 (-174) G/C promoter polymorphism is associated with type-2 diabetes mellitus in Native Americans and Caucasians
AU - Vozarova, Barbora
AU - Fernández-Real, José-Manuel
AU - Knowler, William C
AU - Gallart, Lluis
AU - Hanson, Robert L
AU - Gruber, Jonathan D
AU - Ricart, Wilfredo
AU - Vendrell, Joan
AU - Richart, Cristóbal
AU - Tataranni, P Antonio
AU - Wolford, Johanna K
AU - de Courten, Barbora
PY - 2003/4/1
Y1 - 2003/4/1
N2 - Chronic low-grade activation of the immune system may play a role in the pathogenesis of type-2 diabetes mellitus (T2DM). Interleukin-6 (IL6), a powerful inducer of hepatic acute phase response, has been implicated in the etiology of insulin resistance and T2DM. Recently, an IL6 promoter polymorphism (G/C) at position -174 was found to be associated with measures of insulin sensitivity. Because we have previously found an association between high IL6 levels and insulin resistance in both Pima Indians - a population with high rates of insulin resistance and T2DM - and Caucasians, we aimed to assess whether the IL6 promoter polymorphism is associated with T2DM in these populations. We genotyped the IL6 (-174) G/C polymorphism using pyrosequencing in 463 Native Americans and by PCR-RFLP in 329 Spanish Caucasians. Among the Spanish Caucasian subjects, there was a significant difference in genotypic distribution between diabetic and non-diabetic subjects (P=0.028); the GG genotype was more common in diabetic (0.40) than in non-diabetic (0.29) subjects. The G allele was much more frequent in the Native American sample, and among a sample of 143 cases and 145 controls, the GG genotype was significantly more common in diabetic subjects (P=0.019). When this sample population was stratified according to ethnic heritage, all 211 subjects who were of full Pima Indian heritage had the GG genotype, whereas in the 77 American Indian subjects with non-Pima admixture, T2DM was associated with IL6 genotype (P=0.001). These findings are consistent with a role for genetic determinants of inflammation in the development of T2DM in both Native Americans and Caucasians.
AB - Chronic low-grade activation of the immune system may play a role in the pathogenesis of type-2 diabetes mellitus (T2DM). Interleukin-6 (IL6), a powerful inducer of hepatic acute phase response, has been implicated in the etiology of insulin resistance and T2DM. Recently, an IL6 promoter polymorphism (G/C) at position -174 was found to be associated with measures of insulin sensitivity. Because we have previously found an association between high IL6 levels and insulin resistance in both Pima Indians - a population with high rates of insulin resistance and T2DM - and Caucasians, we aimed to assess whether the IL6 promoter polymorphism is associated with T2DM in these populations. We genotyped the IL6 (-174) G/C polymorphism using pyrosequencing in 463 Native Americans and by PCR-RFLP in 329 Spanish Caucasians. Among the Spanish Caucasian subjects, there was a significant difference in genotypic distribution between diabetic and non-diabetic subjects (P=0.028); the GG genotype was more common in diabetic (0.40) than in non-diabetic (0.29) subjects. The G allele was much more frequent in the Native American sample, and among a sample of 143 cases and 145 controls, the GG genotype was significantly more common in diabetic subjects (P=0.019). When this sample population was stratified according to ethnic heritage, all 211 subjects who were of full Pima Indian heritage had the GG genotype, whereas in the 77 American Indian subjects with non-Pima admixture, T2DM was associated with IL6 genotype (P=0.001). These findings are consistent with a role for genetic determinants of inflammation in the development of T2DM in both Native Americans and Caucasians.
KW - Adult
KW - Aged
KW - Alleles
KW - Asian Continental Ancestry Group
KW - Case-Control Studies
KW - Cytosine
KW - Diabetes Mellitus, Type 2
KW - European Continental Ancestry Group
KW - Female
KW - Genotype
KW - Guanine
KW - Hispanic Americans
KW - Humans
KW - Indians, North American
KW - Interleukin-6
KW - Male
KW - Middle Aged
KW - Polymerase Chain Reaction
KW - Polymorphism, Genetic
KW - Polymorphism, Restriction Fragment Length
KW - Promoter Regions, Genetic
U2 - 10.1007/s00439-003-0912-x
DO - 10.1007/s00439-003-0912-x
M3 - Journal article
C2 - 12589429
VL - 112
SP - 409
EP - 413
JO - Human Genetics
JF - Human Genetics
SN - 0340-6717
IS - 4
ER -
ID: 33926767