Prevalent hyper-methylation of the CDH13 gene promoter in malignant B cell lymphomas

被引:2
|
作者
Ogama, Y
Ouchida, M
Yoshino, T
Ito, S
Takimoto, H
Shiote, Y
Ishimaru, F
Harada, M
Tanimoto, M
Shimizu, K
机构
[1] Okayama Univ, Grad Sch Med & Dent, Dept Mol Genet, Okayama 7008558, Japan
[2] Okayama Univ, Grad Sch Med & Dent, Dept Internal Med 2, Okayama 7008558, Japan
[3] Okayama Univ, Grad Sch Med & Dent, Dept Pathol, Okayama 7008558, Japan
[4] Kyushu Univ, Grad Sch Med Sci, Dept Med & Biosystemic Sci, Higashi Ku, Fukuoka 8128582, Japan
关键词
CDH13; diffuse large B cell lymphoma; DNA methylation; expression; LOH;
D O I
暂无
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
CDH13 (H-cadherin) is a member of the cadherin superfamily, which plays an important role in cell recognition and adhesion. We examined the expression and methylation status of the CDH13 gene in diffuse large B cell lymphomas (B-DLCLs). We found decreased expression of the CDH13 gene in all of 6 hematopoietic cell lines by reverse transcription-polymerase chain reaction (RT-PCR). Promoter hypermethylation of the gene was detected in all 6 cell lines and in 13 of 19 (68%) B-DLCL samples by methylation-specific PCR. Interestingly, the methylation frequency of the CDH13 gene was comparable to those of the tumor suppressor genes p15 (68%) and p16 (74%) detected in B-DLCLs. Sequencing of bisulfite-treated DNA revealed hyper-methylation of the CpG islands of the CDH13 promoter in B-DLCLs and the cell lines. Treatment with 5-aza-2'-deoxycytidine restored CDH13 gene expression in a cell line in which promoter hyper-methylation and impaired expression of the CDH13 gene were observed. Loss of heterozygosity (LOH) around the CDH13 genes on chromosome 16q24 was detected in 6 of 15 (40%) informative cases with microsatellite marker D16S507 and in 6 of 15 (40%) cases with D16S422 in B-DLCLs. In all of 4 B-DLCL cases which showed both promoter methylation and LOH at the two marker loci, expression of the CDH13 gene was significantly low. These results suggest that silencing of the CDH13 gene by aberrant promoter methylation and allelic deletion is associated with tumorigenesis in a subset of B-DLCL.
引用
收藏
页码:685 / 691
页数:7
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