VNTR polymorphism of human IL1RN in Chinese Han and She ethnic populations.
Interleukin 1 receptor antagonist (IL-1Ra) is an important anti-inflammatory molecule encoded by the IL1RN gene. The polymorphism of IL1RN characterized by variable numbers of an 86 bp tandem repeat (VNTR) sequence in intron 2 has been described. Moreover, frequencies of the IL1RN alleles vary among different ethnics. In the present study, we analysed the IL1RN polymorphism in intron 2 in 256 Chinese Han and 252 Chinese She individuals. Four alleles including IL1RN*1, *2, *3 and IL1RN*4 were identified in this study. Data revealed that the distribution of the IL-1RN genotypes and allele was significantly different between the two Chinese populations (P < 0.001). Among them, 66.8% (171/256) and 86.5% (218/252) were homozygous for the allele IL-1RN*1 in Chinese Han and She individuals respectively. Homozygosity for allele IL-1RN*2 was only observed in Chinese Han with the percentage of 0.8% (2/256). Heterozygosity for IL-1RN*1/2, IL1RN*1/3 and IL1RN*1/4 was 30.9% (79/256), 0.4% (1/256) and 1.2% (3/256) in Chinese Han, whereas only heterozygosity for IL-1RN*1/2 was found in Chinese She (13.5%, 34/252). Frequencies of the most common allele IL-1RN*1 and IL-1RN*2 were 83.0% and 16.2% for Chinese Han and 93.3% and 6.7% for Chinese She respectively. The rare allele IL-1RN*3 and IL-1RN*4 was only observed in the Chinese Han population with the frequency of 0.2% and 0.6% respectively. Our findings suggested that the ethnic background plays an important role in IL-1Ra gene variation in different populations.
Medical Research Center, Taizhou Hospital of Zhejiang Province, Wenzhou Medical College, Linhai, Zhejiang, China.
D-P
DP
Xu
Y-Y
YY
Ruan
Y-Q
YQ
Pan
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A
Lin
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M
Li
W-H
WH
Yan
D044466:Asian People / Q000235:genetics*; D002681:China / Q000208:ethnology; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D053590:Interleukin 1 Receptor Antagonist Protein / Q000235:genetics*; D018598:Minisatellite Repeats / Q000235:genetics*; D011110:Polymorphism, Genetic
D053590:Interleukin 1 Receptor Antagonist Protein