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	Study of methylation of histone H3 lysine 9 and H3 lysine 27 during X chromosome inactivation in three types of cells
	Li, Yan ; Tan, Tan ; Zong, Le ; He, Dacheng ; Tao, Wei ; Liang, Qianjin
	2012
关键词	X chromosome inactivation histone H3 lysine 9 dimethylation (H3K9me) histone H3 lysine 27 trimethylation (H3K27me) TUMOR-SUPPRESSOR GENE DNA METHYLATION XIST RNA COLORECTAL-CANCER CPG ISLANDS PATTERNS MAMMALS REGION HYPOACETYLATION HETEROCHROMATIN
DOI	10.1007/s10577-012-9311-2
英文摘要	Histone methylation is one epigenetic modification of an inactive X chromosome (Xi). Histone H3 lysine 9 dimethylation (H3K9me) and histone H3 lysine 27 trimethylation (H3K27me) are both associated with the chromatin of gene-silenced regions in the X chromosome and with X inactivation. Studies have shown that H3K9me is supposedly an early mark on the X chromosome during inactivation. Here, we examined the distribution and enrichment profiles of H3K9me and H3K27me by indirect immunofluorescence. We found that H3K9me appears to have a broad distribution throughout the whole genome, but is specific, to a certain extent, to the Xi in WI38 cells. In contrast, H3K27me is highly specific to the entire Xi, which differs significantly from other areas of the nucleus. Thus, H3K27me is more suitable as an epigenetic mark than H3K9me. The chromatin immunoprecipitation analyses also showed that H3K27me predominates on the inactive genes of the X chromosome. Additionally, we compared the levels of H3K9me and H3K27me in four X-linked genes and two autosomal genes between the normal cells (WI38) and the tumor cells (HeLa). The results revealed that the methylation levels of the inactive genes (POLA and OCRL) in tumor cells (HeLa) were lower than those in normal cells (WI38) and that the methylation levels of the Xi inactivation-avoidance genes (SMCX and ZFX) and autosomal genes (Myc and beta-actin) varied widely in tumor cells (HeLa). These events may be significant for cancer cell development and contribute to the characteristics of tumor cells.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000310318700009&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Biochemistry & Molecular Biology; Genetics & Heredity; SCI(E); 4; ARTICLE; 6; 769-778; 20
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/232094]
专题	生命科学学院
推荐引用方式 GB/T 7714	Li, Yan,Tan, Tan,Zong, Le,et al. Study of methylation of histone H3 lysine 9 and H3 lysine 27 during X chromosome inactivation in three types of cells[J],2012.
APA	Li, Yan,Tan, Tan,Zong, Le,He, Dacheng,Tao, Wei,&Liang, Qianjin.(2012).Study of methylation of histone H3 lysine 9 and H3 lysine 27 during X chromosome inactivation in three types of cells..
MLA	Li, Yan,et al."Study of methylation of histone H3 lysine 9 and H3 lysine 27 during X chromosome inactivation in three types of cells".(2012).

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