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在质瘤中DNA甲基化的分析:预分析变量评估

Karol Bomsztyk¹, Daniel Mar², Oleg Denisenko³

¹UW Medicine South Lake Union, University of Washington, Seattle, Washington; Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, Washington; Matchstick Technologies, Inc, Kirkland, Washington.

Laboratory investigation; a journal of technical methods and pathology

|October 19, 2024

概括

分析前的变量没有影响O6-甲基瓜因-DNA甲基转移酶 (MGMT) 促进体甲基化在多种质母细胞瘤 (GBM) 组织中. 瘤内部异质性突出显示,需要进行多次活检以准确评估MGMT甲基化.

科学领域:

* 分子瘤学 * 分子瘤学
* 表观遗传学是一种表观遗传学.
* 神经瘤学 * 神经瘤学

背景情况:

* 多形质母细胞瘤 (GBM) 依赖于生物标志物,如O6-甲基瓜氨酸-DNA甲基转移酶 (MGMT) 促进剂甲基化,用于预后和治疗.
*生物样本处理中的分析前变量可能会损害数据的可复制性.
*MGMT促进物甲基化的内异质性增加了生物标志物评估的复杂性.

研究的目的:

* 评估分析前变量对GBM中MGMT促进物甲基化的影响.
* 评估用于MGMT分析的固定甲嵌入式 (FFPE) 样本的可靠性.
* 探索 GBM 中新表观遗传生物标志物的潜力.

主要方法:

*使用CryoGrid进行组织存储/采样,使用PIXUL进行样本准备.
* 应用Matrix-MeDIP-qPCR/seq用于5-甲基氨酸DNA免疫沉.
*使用甲基化特异性PCR验证MGMT促进剂甲基化状态.

主要成果:

*在冷和FFPE样本之间,MGMT促进物甲基化没有统计学上显著的差异.
*温暖的ex vivo缺血和重复的冷解周期没有影响DNA甲基化水平.
*26-34%的标本在MGMT促进物甲基化中显示出瘤内部异质性.
*在Matrix-MeDIP-seq分析中,MGMT促进物甲基化与其他弹性基因组位点 (HOXA, lncRNAs) 聚集在一起.

结论:

* 标准预分析变异不会显著影响MGMT促进物甲基化在GBM的评估.
* FFPE样本可用于MGMT甲基化分析.
* 瘤内异质性需要多次活检来进行强大的MGMT甲基化评估.
* CryoGrid-PIXUL-Matrix工具箱显示出开发新型表观遗传GBM生物标志物的希望.

关键词:

这是一个冷网.通过DNA甲基化.在MGMT中,我们可以看到MGMT.皮克苏尔 (PIXUL) 是一个叫做PIXUL的词.质母细胞瘤是一种质母细胞瘤.在分析前的变量.

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X-chromosome...