宫颈癌3p11-p14区域基因沉默中启动子甲基化与染色体缺失之间的相互作用。

Interplay between promoter methylation and chromosomal loss in gene silencing at 3p11-p14 in cervical cancer.

作者信息

Lando Malin, Fjeldbo Christina S, Wilting Saskia M, C Snoek Barbara, Aarnes Eva-Katrine, Forsberg Malin F, Kristensen Gunnar B, Steenbergen Renske Dm, Lyng Heidi

机构信息

a Department of Radiation Biology ; Norwegian Radium Hospital; Oslo University Hospital ; Oslo , Norway.

b Department of Pathology ; VU University Medical Center ; Amsterdam , the Netherlands.

出版信息

Epigenetics. 2015;10(10):970-80. doi: 10.1080/15592294.2015.1085140.

Abstract

Loss of 3p11-p14 is a frequent event in epithelial cancer and a candidate prognostic biomarker in cervical cancer. In addition to loss, promoter methylation can participate in gene silencing and promote tumor aggressiveness. We have performed a complete mapping of promoter methylation at 3p11-p14 in two independent cohorts of cervical cancer patients (n = 149, n = 121), using Illumina 450K methylation arrays. The aim was to investigate whether hyperm-ethylation was frequent and could contribute to gene silencing and disease aggressiveness either alone or combined with loss. By comparing the methylation level of individual CpG sites with corresponding data of normal cervical tissue, 26 out of 41 genes were found to be hypermethylated in both cohorts. The frequency of patients with hypermethylation of these genes was found to be higher at tumor stages of 3 and 4 than in stage 1 tumors. Seventeen of the 26 genes were transcriptionally downregulated in cancer compared to normal tissue, whereof 6 genes showed a significant correlation between methylation and expression. Integrated analysis of methylation, gene dosage, and expression of the 26 hypermethylated genes identified 3 regulation patterns encompassing 8 hypermethylated genes; a methylation driven pattern (C3orf14, GPR27, ZNF717), a gene dosage driven pattern (THOC7, PSMD6), and a combined methylation and gene dosage driven pattern (FHIT, ADAMTS9, LRIG1). In survival analysis, patients with both hypermethylation and loss of LRIG1 had a worse outcome compared to those harboring only hypermethylation or none of the events. C3orf14 emerged as a novel methylation regulated suppressor gene, for which knockdown was found to promote invasive growth in human papilloma virus (HPV)-transformed keratinocytes. In conclusion, hypermethylation at 3p11-p14 is common in cervical cancer and may exert a selection pressure during carcinogenesis alone or combined with loss. Information on both events could lead to improved prognostic markers.

摘要

3p11-p14缺失是上皮癌中的常见事件,也是宫颈癌的候选预后生物标志物。除了缺失外,启动子甲基化可参与基因沉默并促进肿瘤侵袭性。我们使用Illumina 450K甲基化芯片,对两个独立的宫颈癌患者队列(n = 149,n = 121)的3p11-p14启动子甲基化进行了完整图谱绘制。目的是研究高甲基化是否常见,以及它是否单独或与缺失共同导致基因沉默和疾病侵袭性。通过将单个CpG位点的甲基化水平与正常宫颈组织的相应数据进行比较,发现41个基因中的26个在两个队列中均发生了高甲基化。这些基因高甲基化的患者在肿瘤3期和4期的频率高于1期肿瘤。与正常组织相比,26个基因中有17个在癌症中发生转录下调,其中6个基因的甲基化与表达之间存在显著相关性。对26个高甲基化基因的甲基化、基因剂量和表达进行综合分析,确定了3种调控模式,涵盖8个高甲基化基因:甲基化驱动模式(C3orf14、GPR27、ZNF717)、基因剂量驱动模式(THOC7、PSMD6)以及甲基化和基因剂量联合驱动模式(FHIT、ADAMTS9、LRIG1)。在生存分析中,与仅存在高甲基化或未发生任何一种事件的患者相比,LRIG1高甲基化且缺失的患者预后更差。C3orf14是一个新发现的甲基化调控抑制基因,敲低该基因可促进人乳头瘤病毒(HPV)转化的角质形成细胞的侵袭性生长。总之,3p11-p14高甲基化在宫颈癌中很常见,可能在致癌过程中单独或与缺失共同施加选择压力。关于这两种事件的信息可能会带来更好的预后标志物。

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