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利用整合的表观遗传学和细胞遗传学分析鉴定恶性黑色素瘤中的新型肿瘤抑制基因。

Use of integrative epigenetic and cytogenetic analyses to identify novel tumor-suppressor genes in malignant melanoma.

机构信息

Department of Plastic and Reconstructive Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA.

出版信息

Melanoma Res. 2011 Aug;21(4):298-307. doi: 10.1097/CMR.0b013e328344a003.

Abstract

The objective of this study was to identify novel tumor-suppressor genes in melanoma, using an integrative genomic approach. Data from: (i) earlier reports of DNA loss and gain in malignant melanoma accompanied by comparative genomic hybridization high-definition array data of the entire human genome; (ii) microarray expression data from melanoma-derived cell lines identifying genes with significantly increased expression due to methylation using a pharmacologic demethylating strategy; and (iii) publicly available RNA expression microarray data of primary tumors and benign nevi were integrated using statistical tools to define a population of candidate tumor-suppressor genes. Twenty-seven genes were identified in areas of deletion that demonstrated diminished expression in primary melanomas relative to benign nevi and were significantly increased in expression by 5-Aza treatment. Seven genes of these 27 genes demonstrated methylation and deletion in a validation cohort of 14 separate primary tumors. These were: CHRDL1, SFRP1, TMEM47, LPL, RARRES1, PLCXD1, and KOX15. All of these genes demonstrated growth-suppressive properties with transfection into melanoma-derived cell lines. Seven putative tumor-suppressor genes in malignant melanoma were identified using a novel integrative technique.

摘要

本研究旨在通过综合基因组学方法鉴定黑色素瘤中的新型肿瘤抑制基因。数据来自:(i) 恶性黑色素瘤中 DNA 缺失和获得的早期报道,以及整个人类基因组的比较基因组杂交高清数组数据;(ii) 黑色素瘤衍生细胞系的微阵列表达数据,通过药理学去甲基化策略确定由于甲基化而表达显著增加的基因;以及(iii) 来自原发性肿瘤和良性痣的公共可用 RNA 表达微阵列数据,使用统计工具进行整合,以定义候选肿瘤抑制基因群体。在与良性痣相比黑色素瘤中表达减少的缺失区域中鉴定出 27 个基因,并且通过 5-Aza 处理显著增加表达。这 27 个基因中的 7 个基因在 14 个独立原发性肿瘤的验证队列中表现出甲基化和缺失。这些基因是:CHRDL1、SFRP1、TMEM47、LPL、RARRES1、PLCXD1 和 KOX15。所有这些基因在转染黑色素瘤衍生细胞系后均表现出生长抑制特性。使用新型综合技术鉴定了七种恶性黑色素瘤中的潜在肿瘤抑制基因。

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