DNA methylation maintains allele-specific KIR gene expression in human natural killer cells.

DNA methylation maintains allele-specific KIR gene expression in human natural killer cells.
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DOI:
10.1084/jem.20021127
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发表时间:
2003-01-20
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Lutz CT
Lutz CT
中科院分区:
其他
文献类型:
--
作者:
Chan HW;Kurago ZB;Stewart CA;Wilson MJ;Martin MP;Mace BE;Carrington M;Trowsdale J;Lutz CT

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杀伤免疫球蛋白样受体(KIR)结合自身主要组织相容性复合物I类分子,允许自然杀伤(NK)细胞识别下调I类分子的异常细胞。NK细胞表达高度同源的克隆限制性KIR基因的可变数目和组合,但一致地表达KIR 2DL 4。我们发现,NK克隆表达2DL 4等位基因和克隆限制性KIR 3DL 1和3DL 2基因的一个或两个等位基因。尽管不依赖等位基因的表达,3DL 1等位基因在核心启动子中仅相差一个或两个核苷酸。在体内外NK细胞中,等位基因特异性3DL 1基因表达与启动子和5′基因DNA低甲基化相关。DNA甲基化酶抑制剂5-氮杂-2 ′-脱氧胞苷可诱导KIR DNA低甲基化和多种KIR基因的异质性表达。因此,NK细胞使用DNA甲基化来维持高度同源的KIR基因和等位基因的克隆限制性表达。
Killer immunoglobulin-like receptors (KIR) bind self–major histocompatibility complex class I molecules, allowing natural killer (NK) cells to recognize aberrant cells that have down-regulated class I. NK cells express variable numbers and combinations of highly homologous clonally restricted KIR genes, but uniformly express KIR2DL4. We show that NK clones express both 2DL4 alleles and either one or both alleles of the clonally restricted KIR 3DL1 and 3DL2 genes. Despite allele-independent expression, 3DL1 alleles differed in the core promoter by only one or two nucleotides. Allele-specific 3DL1 gene expression correlated with promoter and 5′ gene DNA hypomethylation in NK cells in vitro and in vivo. The DNA methylase inhibitor, 5-aza-2′-deoxycytidine, induced KIR DNA hypomethylation and heterogeneous expression of multiple KIR genes. Thus, NK cells use DNA methylation to maintain clonally restricted expression of highly homologous KIR genes and alleles.
DOI: 10.1093/nar/25.12.2529
发表时间: 1997-06-15
影响因子: 14.9
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